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SDLRC - Scientific Articles all years by Author - Po+


The Sheahan Diamond Literature Reference Compilation
The Sheahan Diamond Literature Reference Compilation is compiled by Patricia Sheahan who publishes on a monthly basis a list of new scientific articles related to diamonds as well as media coverage and corporate announcementscalled the Sheahan Diamond Literature Service that is distributed as a free pdf to a list of followers. Pat has kindly agreed to allow her work to be made available as an online digital resource at Kaiser Research Online so that a broader community interested in diamonds and related geology can benefit. The references are for personal use information purposes only; when available a link is provided to an online location where the full article can be accessed or purchased directly. Reproduction of this compilation in part or in whole without permission from the Sheahan Diamond Literature Service is strictly prohibited. Return to Diamond Resource Center
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Media/Corporate References by Name for all years
A B C D-Diam Diamonds Diamr+ E F G H I J K L M N O P Q R S T U V W X Y Z
Tips for Users
Posted/Published Reference CodesThe SDLRC provides 3 types of references identified in the reference code. DS for scientific article, DM for a media article, and DC for a corporate announcement. Consider DS0512-0001. The DS stands for "diamond scientific". 05 stands for 2005, the year the reference was posted. 12 represents the month the reference was posted. For all years prior to 2015 the default month is 12. -0001 is the reference's identifier and it does not mean anything. The number below the refence code, ie 2015, is the year the article was published. Note that the posted year may sometimes be later than the published year.
Sort OrderReferences are sorted by the "author" name and when the reference was posted to the compilation.
Most RecentIf the reference code is highlighted yellow, the reference was made available through the most recent monthly compilation of new literature. Use this to check out new references. When new references are posted, we make it our priority to track down an online link and obtain an abstract. With regard to older references, tracking down an abstract and an online link is a work in progress.
Link to external location of article: If the title has a link, it means we have found a location online where you can either retrieve the full article free, or purchase access to it. The Sheahan Diamond Literature Service is not a technical article procurement service; if you want a restricted article, you must deal directly with the vendor who controls the copyright to the article.
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Author Index
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
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Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years - Po+
Posted/
Published
AuthorTitleSourceRegionKeywords
DS1994-1565
1994
Poage, M.A.Sears, J.W., Jacob, J.P., Poage, M.A., Sims, J.L., Skinner, L.L.Mid-continent rift analog for middle Proterozoic belt basinGeological Society of America Abstracts, Vol. 26, No. 6, April p. 62. Abstract.GlobalTectonics, Midcontinent
DS1970-0176
1970
Poberezhskiy, V.A.Ponamarenko, A.I., Pankratov, A.A., Poberezhskiy, V.A.Occurrence of Kimberlite Magmatism on the Southern Slope Of the Anabar Anticlise (uplift).In: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 33-47.RussiaBlank
DS1981-0338
1981
Poberezhskiy, V.A.Poberezhskiy, V.A. , Kharkiv, A.D., Smirnov, G.I., Nikishov, K.Xenoliths of the Spinel Pyroxene Depth Facies from Kimberlitic Rocks.Doklady Academy of Science USSR, Earth Science Section., Vol. 248, No. 1-8, PP. 99-102.RussiaGenesis
DS1988-0274
1988
Poberezhskiy, V.A.Gritsik, V.V., Dyakov, A.G., Poberezhskiy, V.A.Carbon isotope composition of diamonds from different diamond bearing provinces of the world.(Russian)Mineral. Sbornik (L'Vov), (Russian), Vol. 42, No. 1, pp. 68-70Russia, GlobalGeochronology, Diamonds, Carbon isotope
DS1989-0553
1989
Poberezhskiy, V.A.Gritsik, V.V., Hashchak, M.S., Poberezhskiy, V.A.The insignificant role of parental carbon fractionation during the synthesis of native impact and synthetic diamonds.(Russian)Mineralogischeskiy Sbornik, (L'vov), (Russian), Vol. 43, No. 1, pp. 95-96RussiaMineral chemistry
DS202008-1434
2020
Pobric, V.Pobric, V., Korolev, N., Kopylova, M.Eclogites of the North Atlantic Craton: insights from Chidliak eclogite xenoliths ( S. Baffin Island, Canada).Contributions to Mineralogy and Petrology, Vol. 175, 8, 25p. PdfCanada, Baffin Islanddeposit - Chidliak

Abstract: The 156-138 Ma Chidliak kimberlites on the Eastern Hall peninsula (EHP) of Baffin Island entrained mantle xenoliths interpreted to have been a part of the Archean North Atlantic Craton (NAC) lithospheric mantle. We studied 19 Chidliak eclogite xenoliths that comprise 10 bimineralic, 5 rutile-bearing, 3 orthopyroxene-bearing and 1 kyanite-bearing eclogites. We report major and trace element compositions of the minerals, calculated bulk compositions, pressures and temperatures of the rock formation and model melt extraction from viable protoliths. The eclogite samples are classified into three groups of HREE-enriched, LREE-depleted and metasomatized based on their reconstructed whole-rock REE patterns. PT parameters of the eclogites were calculated by projecting garnet-clinopyroxene temperatures onto the local P-T arrays for 65 Chidliak peridotite xenoliths. All Chidliak eclogites are equilibrated in the diamond P-T field and cluster in two groups, low-temperature (n?=?5, 840-990 °C at 4.1-5.0 GPa) and high-temperature (n?=?11, T?>?1320 °C at P?>?7.0 GPa). The reconstructed Mg-rich major element bulk compositions and trace elements patterns are similar to Archean basalts from the North Atlantic and Superior cratons and the oceanic gabbros. The LREE-depleted Chidliak eclogites could be residues after 15-55% partial melting of Archean basalt at the eclogite facies of metamorphism that led to extraction of a tonalite-trondhjemite-granodiorite melt from the EHP. The HREE-depleted eclogites may have experienced a lower degree (<10%) of partial melting. Two eclogites may have formed after the gabbro protolith based on the presence of kyanite, high Sr content of garnet and positive Eu anomalies in garnet and bulk eclogite compositions. The metasomatism is reflected in higher Ce/Yb, Sr/Y, TiO2 or MgO of the eclogites. The average contents of MgO, FeO and CaO in NAC eclogites are statistically distinct from those in Slave craton eclogites with a probability of?>95%. The former are more magnesian, less ferrous and calcic, contain more magnesian and less calcic garnets, and lower proportions of group C eclogites. The contrast may relate to the stronger NAC metasomatism by silicate-carbonate melt observed in Chidliak peridotitic mantle, or to the different formation ages of the eclogites beneath the two cratons.
DS202008-1435
2020
Pobric, V.Pobric, V., Korolev, N., Kopylova, M.Eclogites of the North Atlantic Craton: insights from Chidliak eclogite xenoliths ( S. Baffin Island, Canada).Goldschmidt 2020, 1p. AbstractCanada, Baffin Islanddeposit - Chidliak
DS1993-1246
1993
Pochtarev, V.I.Pochtarev, V.I.Magnetic properties of the upper mantleRussian Geology and Geophysics, Vol. 34, No. 2, pp. 126-131.RussiaMantle, Geophysics
DS1996-1125
1996
Pockley, P.Pockley, P.Shifting ground, rock solid or dead boring: public perceptions ofgeoscienceAustralia Geologist, pp. 29-34AustraliaInformation, Geoscience -perception
DS200512-0667
2004
Pocock, J.Mabuza, N.T., Pocock, J., Loveday, B.K.The use of surface active chemicals in heavy medium viscosity reduction.Minerals Engineering, Vol. 18, pp. 25-31.Africa, South AfricaDMS, magnetite, viscosity
DS201903-0531
2019
Podborodnikov, I.V.Martirosayan, N.S., Shatskiy, A., Chanyshev, A.D., Litasov, K.D., Podborodnikov, I.V., Yoshino, T.Effect of water on the magnesite-iron interaction, with implications for the fate of carbonates in the deep mantle.Lithos, Vol. 326-327, pp. 435-445.Mantleperidotite

Abstract: The subduction of carbonates beyond 250-300?km, where redox conditions favour the presence of metallic iron (Fe), will result in redox reactions with the Fe dispersed in the silicate rocks. Here, we studied the effect of water on the carbonate-Fe interaction in the hydromagnesite-Fe system at 6, 8 and 16?GPa and the peridotite-CO2-H2O-Fe system at 8?GPa, using a multianvil apparatus. In all of the studied samples, we observed the formation of magnesiowüstite, graphite and carbide. Additionally, in the peridotite-CO2-H2O-Fe system, magnesiowüstite reacted with pyroxenes, resulting in olivine enrichment. Kinetic calculations performed at 8?GPa showed that, at the pressure-temperature (P-T) parameters of the ‘hot’, ‘medium’ and ‘cold’ subduction, about 40, 12 and 4?vol% of carbonates, respectively, would be reduced in the hydrous system within 1 Myr, assuming direct contact with Fe. Based on the present results, it is suggested that carbonates will largely be consumed during the characteristic subduction time to the mantle transition zone by reaction with the reduced mantle in the presence of hydrous fluid.
DS201903-0539
2019
Podborodnikov, I.V.Podborodnikov, I.V., Shatskiy, A., Arefiev, A.V., Litasov, K.D.Phase relations in the system Na2COs-CaCO3 at 3 Gpa with implications for carbonatite genesis and evolution.Lithos, in press available 43p.Mantlecarbonatite

Abstract: The phase relations in the system Na2CO3-CaCO3-MgCO3 have been studied at 3?GPa and 700-1285?°C using a Kawai-type multianvil press. At 700?°C, the system has five intermediate compounds: dolomite, Mg-bearing Na2Ca4(CO3)5 burbankite, Na2Ca3(CO3)4, Na4Ca(CO3)3, and eitelite. As temperature increases to 800?°C, the system is complicated by an appearance of Ca-dolomite and Mg-bearing shortite, while Na2Ca4(CO3)5 disappears. At 850?°C, Na4Ca(CO3)3 decomposes to produce Na carbonate and nyerereite. The latter melts incongruently at 875?±?25?°C to form Na2Ca3(CO3)4. Incongruent melting of eitelite to magnesite and liquid, occurs at 925?±?25 °C. Mg-bearing shortite melts incongruently at 950?±?50?°C, producing Na2Ca3(CO3)4 and liquid. Na2Ca3(CO3)4 disappears at 1000?°C via incongruent melting to calcite and liquid. The liquidus projection of the studied ternary system has seven primary solidification phase regions for magnesite, dolomite-calcite solid solutions, Na2Ca3(CO3)4, Mg-bearing shortite, nyerereite, eitelite, and Na carbonate. The primary solidification regions are separated by five peritectic and three cotectic monovariant lines. The system has six ternary peritectic points and one minimum on the liquidus at 850?°C and 52Na2CO3·48(Ca0.62Mg0.38)CO3. The minimum point resembles a eutectic controlled by a four-phase reaction, by which, on cooling, a liquid transforms into three solid phases: shortite, Na carbonate, and eitelite. Since the system has a single eutectic at 3?GPa, there is no thermal barrier preventing continuous liquid fractionation from Na-poor toward Na-rich dolomitic compositions more alkaline than eitelite and nyerereite. Considering the present results and previous data, a range of Na-Ca-Mg double carbonates changes in the following sequence upon pressure and temperature increase: Na2Ca2(CO3)3 (Amm2) shortite, Na2Ca(CO3)2 (P21ca) nyerereite, Na2Mg(CO3)2 () eitelite (0.1?GPa)???Na2(Ca0.97-0.98Mg0.02-0.03)4(CO3)5 (P63mc), Na2(Ca=0.91Mg=0.09)3(CO3)4 (P1n1), Na2(Ca?=?0.81?Mg0=0.19)(CO3)2 () nyerereite, Na2(Ca0.77-0.93Mg0.07-0.23)2(CO3)3 (Amm2) shortite, Na4(Ca0.90-0.98Mg0.02-0.10)(CO3)3 (Ia3d), Na2(Mg=0.9Ca0=0.1)(CO3)2 (P21ca) eitelite (3?GPa)???Na2(Ca=0.87Mg0=0.13)4(CO3)5 (P63mc), Na2(Ca=0.89Mg=0.11)3(CO3)4 (P1n1), Na4(Ca?=?0.7?Mg0=0.3)(CO3)3 (Ia3d), Na2(Mg=0.92Ca0=0.08)(CO3)2 (P21ca) eitelite (6?GPa). Using the present results at 3?GPa and previous data at 6?GPa in the Na2CO3-CaCO3-MgCO3 system, we constrained isopleths of the Na2CO3 content in melt coexisting with Ca-Mg carbonates. We found that the cratonic geotherms cross the isopleths so that the carbonatite melt percolating upward via the continental mantle lithosphere should become progressively enriched in Na, evolving from alkali-poor dolomitic composition at depths exceeding 200?km toward sodic dolomitic with the ~52?mol% Na2CO3 at 80-120?km depths.
DS201905-1067
2019
Podborodnikov, I.V.Podborodnikov, I.V., Shatskiy, A., Arefiev, A.V., Litasov, K.D.Phase relations in the system Na2CO3-CaCO3-MgCO3 at 3 GPa with implications for carbonatite genesis and evolution.Lithos, Vol. 330-331, pp. 74-89.Mantlecarbonatite

Abstract: The phase relations in the system Na2CO3-CaCO3-MgCO3 have been studied at 3?GPa and 700-1285?°C using a Kawai-type multianvil press. At 700?°C, the system has five intermediate compounds: dolomite, Mg-bearing Na2Ca4(CO3)5 burbankite, Na2Ca3(CO3)4, Na4Ca(CO3)3, and eitelite. As temperature increases to 800?°C, the system is complicated by an appearance of Ca-dolomite and Mg-bearing shortite, while Na2Ca4(CO3)5 disappears. At 850?°C, Na4Ca(CO3)3 decomposes to produce Na carbonate and nyerereite. The latter melts incongruently at 875?±?25?°C to form Na2Ca3(CO3)4. Incongruent melting of eitelite to magnesite and liquid, occurs at 925?±?25 °C. Mg-bearing shortite melts incongruently at 950?±?50?°C, producing Na2Ca3(CO3)4 and liquid. Na2Ca3(CO3)4 disappears at 1000?°C via incongruent melting to calcite and liquid. The liquidus projection of the studied ternary system has seven primary solidification phase regions for magnesite, dolomite-calcite solid solutions, Na2Ca3(CO3)4, Mg-bearing shortite, nyerereite, eitelite, and Na carbonate. The primary solidification regions are separated by five peritectic and three cotectic monovariant lines. The system has six ternary peritectic points and one minimum on the liquidus at 850?°C and 52Na2CO3·48(Ca0.62Mg0.38)CO3. The minimum point resembles a eutectic controlled by a four-phase reaction, by which, on cooling, a liquid transforms into three solid phases: shortite, Na carbonate, and eitelite. Since the system has a single eutectic at 3?GPa, there is no thermal barrier preventing continuous liquid fractionation from Na-poor toward Na-rich dolomitic compositions more alkaline than eitelite and nyerereite. Considering the present results and previous data, a range of Na-Ca-Mg double carbonates changes in the following sequence upon pressure and temperature increase: Na2Ca2(CO3)3 (Amm2) shortite, Na2Ca(CO3)2 (P21ca) nyerereite, Na2Mg(CO3)2 () eitelite (0.1?GPa)???Na2(Ca0.97-0.98Mg0.02-0.03)4(CO3)5 (P63mc), Na2(Ca=0.91Mg=0.09)3(CO3)4 (P1n1), Na2(Ca?=?0.81?Mg0=0.19)(CO3)2 () nyerereite, Na2(Ca0.77-0.93Mg0.07-0.23)2(CO3)3 (Amm2) shortite, Na4(Ca0.90-0.98Mg0.02-0.10)(CO3)3 (Ia3d), Na2(Mg=0.9Ca0=0.1)(CO3)2 (P21ca) eitelite (3?GPa)???Na2(Ca=0.87Mg0=0.13)4(CO3)5 (P63mc), Na2(Ca=0.89Mg=0.11)3(CO3)4 (P1n1), Na4(Ca?=?0.7?Mg0=0.3)(CO3)3 (Ia3d), Na2(Mg=0.92Ca0=0.08)(CO3)2 (P21ca) eitelite (6?GPa). Using the present results at 3?GPa and previous data at 6?GPa in the Na2CO3-CaCO3-MgCO3 system, we constrained isopleths of the Na2CO3 content in melt coexisting with Ca-Mg carbonates. We found that the cratonic geotherms cross the isopleths so that the carbonatite melt percolating upward via the continental mantle lithosphere should become progressively enriched in Na, evolving from alkali-poor dolomitic composition at depths exceeding 200?km toward sodic dolomitic with the ~52?mol% Na2CO3 at 80-120?km depths.
DS201906-1336
2019
Podborodnikov, I.V.Podborodnikov, I.V., Shatskiy, A., Arefiev, A.V., Bekhtenova, A.New data on the system Na2CO3-CaCO3-MgCO3 at 6 Gpa with implications to the composition and stability of carbonatite melts at the base of continental lithosphere.Chemical Geology, Vol. 515, pp. 50-60.Russiadeposit - Udachnaya-East

Abstract: Subsolidus and melting phase relationships in the system Na2CO3-CaCO3-MgCO3 have been studied at 6?GPa and 900-1250?°C using a Kawai-type multianvil press. At 900 and 1000?°C, the system has four intermediate compounds: Na2Ca4(CO3)5 burbankite, Na2Ca3(CO3)4, Na4Ca(CO3)3, and Na2Mg(CO3)2 eitelite. The Na-Ca compounds dissolve noticeable amounts of Mg component, whereas eitelite dissolves a few percents of Ca component: Na2(Ca=0.91Mg=0.09)4(CO3)5, Na2(Ca=0.94Mg=0.06)3(CO3)4, Na4(Ca=0.67Mg=0.33)(CO3)3, and Na2(Mg=.93Ca=0.07)(CO3)2. At 1050?°C, the system is complicated by an appearance of dolomite. Na-Ca burbankite decomposes at 1075?±?25?°C to aragonite plus Na2Ca3(CO3)4. Na4Ca(CO3)3 and eitelite disappear via congruent melting between 1200 and 1250?°C. Na2Ca3(CO3)4 remains stable through the whole studied temperature range. The liquidus projection of the studied ternary system has eight primary solidification phase regions for magnesite, dolomite, calcite-dolomite solid solutions, aragonite, Na2Ca3(CO3)4, Na4Ca(CO3)3, and Na2CO3 solid solutions. The system has five ternary peritectic reaction points and one minimum on the liquidus at 1050?°C and 48Na2CO3•52(Ca0.75Mg0.25)CO3. The minimum point resembles a eutectic controlled by a four-phase reaction, by which a liquid transforms into three solid phases upon cooling: Na2(Ca0.94Mg0.06)3(CO3)4, Na4(Ca0.67Mg0.33)(CO3)3, and Na2(Mg0.93Ca0.07)(CO3)2 eitelite. Since at 6?GPa, the system has a single eutectic, there is no thermal barrier preventing continuous liquid fractionation from alkali-poor toward Na-rich dolomitic compositions. Cooling of the Na-Ca-Mg carbonatite melt from 1400 to 1100?°C within the lherzolite substrate will be accompanied by magnesite crystallization and wehrlitization keeping calcium number of the melt at 40 and shifting the Na2CO3 content to =40?mol%. In the case of the eclogitic wall rock, the cooling will be accompanied by dolomite crystallization keeping calcium number of the melt at 60-65 and shifting the Na2CO3 content to =30?mol%.
DS201908-1812
2019
Podborodnikov, I.V.Shatskiy, A., Arefiev, A.V., Podborodnikov, I.V., Litasov, K.D.Origin of K-rich diamond-forming immscible melts and CO2 fluid via partial melting of carbonated pelites at depth of 180-200 km.Gondwana Research, Vol. 75, pp. 154-171.Mantlediamond genesis

Abstract: Melt inclusions in kimberlitic and metamorphic diamonds worldwide range in composition from potassic aluminosilicate to alkali-rich carbonatitic and their low-temperature derivative, a saline high-density fluid (HDF). The discovery of CO2 inclusions in diamonds containing eclogitic minerals are also essential. These melts and HDFs may be responsible for diamond formation and metasomatic alteration of mantle rocks since the late Archean to Phanerozoic. Although a genetic link between these melts and fluids was suggested, their origin is still highly uncertain. Here we present experimental results on melting phase relations in a carbonated pelite at 6?GPa and 900-1500?°C. We found that just below solidus K2O enters potassium feldspar or K2TiSi3O9 wadeite coexisting with clinopyroxene, garnet, kyanite, coesite, and dolomite. The potassium phases react with dolomite to produce garnet, kyanite, coesite, and potassic dolomitic melt, 40(K0.90Na0.10)2CO3•60Ca0.55Mg0.24Fe0.21CO3?+?1.9?mol% SiO2?+?0.7?mol% TiO2?+?1.4?mol% Al2O3 at the solidus established near 1000?°C. Molecular CO2 liberates at 1100?°C. Potassic aluminosilicate melt appears in addition to carbonatite melt at 1200?°C. This melt contains (mol/wt%): SiO2?=?57.0/52.4, TiO2?=?1.8/2.3, Al2O3?=?8.5/13.0, FeO?=?1.4/1.6, MgO?=?1.9/1.2, CaO?=?3.8/3.2, Na2O?=?3.2/3.0, K2O?=?10.5/15.2, CO2?=?12.0/8.0, while carbonatite melt can be approximated as 24(K0.81Na0.19)2CO3•76Ca0.59Mg0.21Fe0.20CO3?+?3.0?mol% SiO2?+?1.6?mol% TiO2?+?1.4?mol% Al2O3. Both melts remain stable to at least 1500?°C coexisting with CO2 fluid and residual eclogite assemblage consisting of K-rich omphacite (0.4-1.5?wt% K2O), almandine-pyrope-grossular garnet, kyanite, and coesite. The obtained immiscible alkali-carbonatitic and potassic aluminosilicate melts resemble compositions of melt inclusions in diamonds worldwide. Thus, these melts entrapped by diamonds could be derived by partial melting of the carbonated material of the continental crust subducted down to 180-200?km depths. Given the high solubility of chlorides and water in both carbonate and aluminosilicate melts inferred in previous experiments, the saline end-member, brine, could evolve from potassic carbonatitic and/or silicic melts by fractionation of Ca-Mg carbonates/eclogitic minerals and accumulation of alkalis, chlorine and water in the residual low-temperature supercritical fluid. Direct extraction from the hydrated marine sediments under conditions of cold subduction would be another possibility for the brine formation.
DS201909-2085
2019
Podborodnikov, I.V.Shatskiy, A., Arefiev, A.V., Podborodnikov, I.V., Litasov, K.D.Origin of K-rich diamond forming immiscible melts and CO2 fluid via partial melting of carbonated pelites at a depth of 180-200km.Gondwana Research, Vol. 75, pp. 154-171.Mantlediamond genesis

Abstract: Melt inclusions in kimberlitic and metamorphic diamonds worldwide range in composition from potassic aluminosilicate to alkali-rich carbonatitic and their low-temperature derivative, a saline high-density fluid (HDF). The discovery of CO2 inclusions in diamonds containing eclogitic minerals are also essential. These melts and HDFs may be responsible for diamond formation and metasomatic alteration of mantle rocks since the late Archean to Phanerozoic. Although a genetic link between these melts and fluids was suggested, their origin is still highly uncertain. Here we present experimental results on melting phase relations in a carbonated pelite at 6?GPa and 900-1500?°C. We found that just below solidus K2O enters potassium feldspar or K2TiSi3O9 wadeite coexisting with clinopyroxene, garnet, kyanite, coesite, and dolomite. The potassium phases react with dolomite to produce garnet, kyanite, coesite, and potassic dolomitic melt, 40(K0.90Na0.10)2CO3•60Ca0.55Mg0.24Fe0.21CO3?+?1.9?mol% SiO2?+?0.7?mol% TiO2?+?1.4?mol% Al2O3 at the solidus established near 1000?°C. Molecular CO2 liberates at 1100?°C. Potassic aluminosilicate melt appears in addition to carbonatite melt at 1200?°C. This melt contains (mol/wt%): SiO2?=?57.0/52.4, TiO2?=?1.8/2.3, Al2O3?=?8.5/13.0, FeO?=?1.4/1.6, MgO?=?1.9/1.2, CaO?=?3.8/3.2, Na2O?=?3.2/3.0, K2O?=?10.5/15.2, CO2?=?12.0/8.0, while carbonatite melt can be approximated as 24(K0.81Na0.19)2CO3•76Ca0.59Mg0.21Fe0.20CO3?+?3.0?mol% SiO2?+?1.6?mol% TiO2?+?1.4?mol% Al2O3. Both melts remain stable to at least 1500?°C coexisting with CO2 fluid and residual eclogite assemblage consisting of K-rich omphacite (0.4-1.5?wt% K2O), almandine-pyrope-grossular garnet, kyanite, and coesite. The obtained immiscible alkali-carbonatitic and potassic aluminosilicate melts resemble compositions of melt inclusions in diamonds worldwide. Thus, these melts entrapped by diamonds could be derived by partial melting of the carbonated material of the continental crust subducted down to 180-200?km depths. Given the high solubility of chlorides and water in both carbonate and aluminosilicate melts inferred in previous experiments, the saline end-member, brine, could evolve from potassic carbonatitic and/or silicic melts by fractionation of Ca-Mg carbonates/eclogitic minerals and accumulation of alkalis, chlorine and water in the residual low-temperature supercritical fluid. Direct extraction from the hydrated marine sediments under conditions of cold subduction would be another possibility for the brine formation.
DS202009-1659
2020
Podborodnikov, I.V.Shatskiy, A., Arefiev, A.V.,Podborodnikov, I.V., Litasov, K.D.Liquid immiscibility and phase relations in the system KAlSi0308-CaMg ( CO3)2+- NaAiSi2O6+- Na2CO3 at Gpa: implications for diamond forming melts.Chemical Geology, Vol. 550, 17p. PdfMantlemelting

Abstract: To evaluate the effect of Na on the carbonate-silicate liquid immiscibility in the diamond stability field, we performed experiments along some specific joins of the system KAlSi3O8-CaMg(CO3)2 ± NaAlSi2O6 ± Na2CO3 at 6 GPa. Melting in all studied joins begins at 1000-1050 °C. The melting in the Kfs + Dol system is controlled by the reaction 6 KAlSi3O8 (K-feldspar) + 6 CaMg(CO3)2 (dolomite) = 2 (Can,Mg1-n)3Al2Si3O12 (garnet) + Al2SiO5 (kyanite) + 11 SiO2 (coesite) + 3 K2(Ca1-n,Mgn)2(CO3)3 (carbonatitic melt) + 3 CO2 (fluid), where n ~ 0.3-0.4. A temperature increasing to 1300 °C yields an appearance of the silicic immiscible melt in addition to carbonatitic melt via the reaction K2CO3 (carbonatitic melt) + Al2SiO5 (kyanite) + 5 SiO2 (coesite) = 2 KAlSi3O8 (silicic melt) + CO2 (fluid or solute in melts). The silicic melt composition is close to KAlSi3O8 with dissolved CaMg(CO3)2 and molecular CO2. An addition of NaAlSi2O6 or Na2CO3 to the system results in partial decomposition of K-feldspar and formation of K-bearing carbonates, (K, Na)2Mg(CO3)2 and (K, Na)2Ca3(CO3)4. Their melting produces carbonatite melt with the approximate composition of 4(K, Na)2CO3•6Ca0.6Mg0.4CO3 and magnesite. Besides, the presence of NaAlSi2O6 in the studied system shifts the lower-temperature limit of immiscibility to 1500°?, while the presence of Na2CO3 eliminates the appearance of silicic melt by the following reaction: 2 KAlSi3O8 (in the silicic melt) + Na2CO3 = 2 NaAlSi2O6 (in clinopyroxene) + K2CO3 (in the carbonatitic melt) + SiO2 (coesite). Thus, an increase of the Na2O content in the system Na2O-K2O-CaO-MgO-Al2O3-SiO2-CO2 consumes Al2O3 and SiO2 from silicic melt to form clinopyroxene. We found that grossular-pyrope and diopside-jadeite solid solutions can coexist with CO2 fluid at 900-1500 °C and 6 GPa. Thus, CO2 fluid is stable in the eclogitic suite in the diamond stability field under temperature conditions of the continental lithosphere and subducting slabs. Variations in the Na2O content observed in carbonatitic melts trapped by natural in diamonds exceed those derived by the pelite melting. The present experiments show that an addition of NaAlSi2O6 to the Kfs + Dol system does not cause an increase of the Na2O content in the carbonatitic melt, whereas the addition of Na2CO3 at Na2O/Al2O3 > 1 yields the formation of the melts with the Na2O contents covering the entire range of natural compositions. Thus, only the presence of additional salt components can explain the elevated Na2O content in the melts trapped in lithospheric diamonds. In addition to carbonates, sodium can be hosted by chlorides, sulfates, etc.
DS202009-1660
2020
Podborodnikov, I.V.Shatskiy, A., Bekhtenova, A., Podborodnikov, I.V., Arefiev, A.V., Litasov, K.D.Metasomatic interaction of the eutectic Na- and K-bearing carbonate melts with natural garnet lherzolite at 6 Gpa and 1100-1200 C: toward carbonatite melt composition in SCLM.Lithos, Vol. 374-375, 17p. PdfMantlemetasomatism

Abstract: The range of carbonatite melts in equilibrium with the subcontinental lithospheric mantle (SCLM) under geothermal conditions is limited by alkali-rich near-eutectic compositions. Therefore, here we employed eutectic Na/K-Ca-Mg-Fe carbonate mixtures to model the interaction of a metasomatic carbonatite melt with natural garnet lherzolite. The experiments were performed at 1100 and 1200 °C and 6 GPa in graphite capsules using a multianvil press. The run duration was 111 and 86 h, respectively. To verify achieving an equilibrium, a synthetic mixture identical to natural lherzolite was also employed. We have found that both Na- and K-bearing carbonatite melts cause wehrlitization accompanying by the elimination of orthopyroxene and an increase of CaO in garnet at a constant Cr2O3. Interaction with the K-carbonatite melt alters clinopyroxene composition toward lower Na2O (0.2-0.3 wt%), and higher K2O (0.5-1.0 wt%), whereas the Na-carbonatite melt revealed the opposite effect. The resulting melts have a following approximate composition [40(Na, K)2CO3·60Ca0.5Mg0.4Fe0.1CO2 + 0.6-1.4 wt% SiO2] displaying a decrease in Ca# at a nearly constant alkali content relative to the initial composition, where Ca# = 100·Ca/(Ca + Mg + Fe). We have also found that alkali-poor (= 20 mol% (Na, K)2CO3) carbonate mixtures do not melt completely but yield magnesite and alkali- and Ca-rich melts like those in the systems with eutectic mixtures. Under SCLM P-T conditions the range of carbonatite melt compositions is restricted by the full melting field of alkali-rich carbonates in the corresponding Na/K-Ca-Mg carbonate systems. Infiltration of less alkaline higher-temperature carbonatite melt in SCLM and its subsequent cooling to the ambient mantle temperature, 1100-1200 °C at 6 GPa, should cause crystallization of magnesite and shift the melt composition to [30(Na, K)2CO3·70Ca0.6Mg0.3Fe0.1CO3]. Owing to its high Ca#, this melt is not stable in equilibrium with orthopyroxene yielding its disappearance by CaMg exchange reaction producing clinopyroxene, magnesite, and shifting the melt composition toward higher alkali content. The melts containing 40-45 mol% of alkaline carbonates have no limitation in Ca# because the corresponding binary NaMg and KMg carbonate eutectics are located near 1200 °C. Therefore, these melts can achieve Ca# = 30-40 and, be in equilibrium with garnet lherzolites and harzburgites under the geothermal condition of SCLM. Considering the present results and previous experimental data the following ranges of carbonatite melt compositions can be expected in equilibrium with garnet peridotites at the base of SCLM: Ca# < 30 and > 30 mol% (K, Na)2CO3 in equilibrium with harzburgite; Ca# 30-40, >25 mol% (K, Na)2CO3 in equilibrium with lherzolite; and Ca# 40-60 and >20 mol% (K, Na)2CO3 in equilibrium with wehrlite.
DS202012-2250
2020
Podbororodnikov, I.V.Shatskiy, A., Bekhtenova, A., Podbororodnikov, I.V., Arefiev, A.V.Carbonate melt interaction with natural eclogite at 6 Gpa and 1100-1200 C Implcations for metasomatic melt composition in subcontinental lithospheric mantle.Chemical Geology, Vol. 558, 119915, 15p. PdfMantlecarbonatite

Abstract: Compositional ranges of carbonate melts stable under P-T conditions corresponding to the base of subcontinental lithospheric mantle (SCLM) are limited by alkali-rich near-eutectic compositions. In the present work, we investigated the interaction of such melts with the natural eclogite of Group A. It was found that the interaction is accompanied by decreasing Ca# in the melt (L) and increasing Ca# in garnet (Grt) according to the reaction: 3CaCO3 (L) + Mg3Al2Si3O12 (Grt) = 3MgCO3 (Mgs and/or L) + Ca3Al2Si3O12 (Grt), where Mgs is magnesite. The interaction with the Na-Ca-Mg-Fe carbonate melt increases amount of jadeite component in clinopyroxene (Cpx) consuming Al2O3 from garnet and Na2O from the melt according to the reaction: Na2CO3 (L) + CaCO3 (L) + 2Mg3Al2Si3O12 (Grt) + 2CaMgSi2O6 (Cpx) = 2NaAlSi2O6 (Cpx) + Ca3Al2Si3O12 (Grt) + 2MgCO3 (Mgs, L) + 3Mg2SiO4 (Ol). As a result, garnet and omphacite compositions evolve from eclogite Group A to eclogite Group B. A byproduct of the reaction is olivine (Ol), which may explain the formation of inclusions of “mixed” eclogite (garnet + omphacite) and peridotite (olivine) paragenesis in lithospheric diamonds. The interaction with the K-Ca-Mg-Fe carbonate melt increases the K2O content in clinopyroxene to 0.5-1.2 wt%, while the Na2O content lowers to 0.3 wt%. The following range of carbonatite melt compositions can be in equilibrium with eclogite at the base of SCLM (1100-1200 °C and 6 GPa): 18(Na0.97K0.03)2CO3·82(Ca0.63Mg0.30Fe0.07)CO2-42(Na0.97K0.03)2CO3·58(Ca0.46Mg0.45Fe0.09)CO2. Our results also suggest that the partial melting of ‘dry’ carbonated eclogite, if any, at 1100 °C and 6 GPa yields the formation of a carbonate melt with the following composition (mol%) 25(Na0.96K0.04)2CO3·75(Ca0.64Mg0.31Fe0.05)CO2, corresponding to 18-27 wt% Na2O in the melt on a volatile-free basis.
DS1992-1213
1992
Podchasov, V.M.Podchasov, V.M.Main industrial and genetic types of diamond placer deposits, methods of prospecting and explorationWalsh, D.E. ed. 13th. Biennial Conference on Placer mining and trade, pp. 18-19. abstractRussiaNo information of any use, Brief overview of placer sized deposits
DS1992-1214
1992
Poddar, B.C.Poddar, B.C.Panna diamond belt in Central India, geological setting and exploration strategy - a profile.International Roundtable Conference on Diamond Exploration and Mining, held, pp. 187-188. abstract only.IndiaGeology, Panna belt
DS1983-0520
1983
Poddar, M.Poddar, M., Rathor, B.S.Vlf Survey of the Weathered Layer in Southern IndiaGeophysical Prospecting, Vol. 31, PP. 524-537.India, Andhra PradeshGeophysics
DS1985-0535
1985
Podgaets, A.V.Podgaets, A.V., Kotelnik, D.D., Voitkovs, I.B., Ilupin, I.P.Genesis and Pecularities of the Transformation of Magnetite from Yakutian Kimberlites. #2Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 282, No. 5, PP. 1238-1242.RussiaBlank
DS1985-0536
1985
Podgaetskii, A.V.Podgaetskii, A.V., Koteinikov, D.D., Voitkovskii, I.B., Ilupin.Genesis and Pecularities of the Transformation of Magnetite from Yakutian Kimberlites. #1Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 282, No. 2, PP. 1238-1242.Russia, YakutiaMineralogy
DS1988-0740
1988
Podgaetskii, A.V.Voitkovskii, Yu.B., Kotelnikov, D.D., Podgaetskii, A.V., Ilupin, I.P.Varieties of magnetite from the kimberlites of Yakutia.(Russian)Zap. Vses. Mineral. O-Va, (Russian), Vol. 116, No. 4, pp. 458-465RussiaBlank
DS1986-0903
1986
Podgaetskiy, A.V.Zinchuk, N.N., Kotelnikov, D.D., Podgaetskiy, A.V., Voitkovskiy, Yu.B.Sequence of variation on some iron containing minerals From kimberlites at differemt stage of supergene process.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 290, No. 6, pp. 1467-1471RussiaMineralogy
DS1987-0583
1987
Podgayetskiy, A.V.Podgayetskiy, A.V., Kotelnikov, D.D., Voytkovskiy, Yu.B., IlupinOrigin and alterations of magnetite from kimberlites of YakutiaDoklady Academy of Sciences Acad. Science USSR Earth Sci. Section, Vol. 282, No. 1-6, pp. 167-172RussiaGeochemistry, Magnetite
DS1988-0782
1988
Podgayetskiy, A.V.Zinchuk, N.N., Kotelnikov, D.D., Podgayetskiy, A.V., VoytkovskiySequence of alteration of some iron bearing kimberlite minerals indifferent stages of the supergene processDoklady Academy of Science USSR, Earth Science Section, Vol. 290, No. 1-6, March pp. 196-199RussiaMagnetics, Geophysics, Yakutia
DS1993-1675
1993
Podgayetskiy, A.V.Viytkovskiy, Yu.B., Podgayetskiy, A.V., Zinchuk, N.N., KotelnikovIlmenite xenoliths and groundmass of kimberlite from the Mir and Sytykanskaya pipes.Doklady Academy of Sciences USSR, Earth Science Section, Vol. 317, pp. 191-195.Russia, YakutiaXenolith mineralogy, Deposits
DS1993-1684
1993
Podgayetskiy, A.V.Voytkovskiy, Yu.B., Podgayetskiy, A.V., Zinchuk, N.N., KotelnikovIlmenite in xenoliths and groundmass of kimberlite from the Mir and Sytykanskaya pipes.Doklady Academy of Sciences USSR, Earth Science Section, Vol. 317, No. 5, pp. 191-195.Russia, Commonwealth of Independent States (CIS), YakutiaXenoliths, Malaya Botuobiya field
DS1975-0871
1978
Podgornikh, N.M.Sobolev, V.S., Panina, L.I., Podgornikh, N.M.Crystallization Temperatures of Several Carbonatite Minerals from Siberia.I Symposio International De Carbonatitos, PP. 215-219.RussiaPetrology, Mineral Chemistry
DS201412-0672
2013
Podgornova, S.T.Perchuk, A.L., Shur, M.Yu., Yapaskurt, V.O., Podgornova, S.T.Experimental modeling of mantle metasomatism coupled with eclogitization of crustal material in a subduction zone.Petrology, Vol. 21, 6, pp. 579-598.MantleSubduction
DS200512-0746
2001
Podgornych, N.M.Morikiyo, T., Miyazaki, T., Kagami, H., Vladykin, N.V., Chernysheva, E.A., Panina, L.I., Podgornych, N.M.Sr Nd C and O isotope characteristics of Siberian carbonatites.Alkaline Magmatism and the problems of mantle sources, pp. 69-84.Russia, SiberiaGeochronology
DS1970-0972
1974
Podgornykh, N.M.Panina, L.I., Podgornykh, N.M.Temperature of Formation of Melilite Rocks of the Turiy Peninsula.Doklady Academy of Science USSR, Earth Science Section., Vol. 217, No. 1-6, PP. 141-144.RussiaGenesis
DS1975-0155
1975
Podgornykh, N.M.Panina, L.I., Podgornykh, N.M.Inclusions of Melt in Minerals from Carbonatite of the Beloziminskiy Pluton.Doklady Academy of Science USSR, Earth Science Section., Vol. 223, No. 1-6, PP. 165-167.RussiaKimberlite
DS1994-1897
1994
Podiadchikov, Y.Weinberg, R.F., Podiadchikov, Y.Diapiric ascent of magmas through power law crust and mantleJournal of Geophysical Research, Vol. 99, No. B5, May 10, pp. 9543-9560.MantleMagmas, Plumes, volcanism
DS201906-1283
2018
Podkamenny, Y.A.Chanturia, V.A., Dvoichenkova, G.P., Morozov, V.V., Kovalchuk, O.E., Podkamenny, Y.A., Yakolev, V.N.Experimental justification of luminophore composition for indication of diamonds in x-ray luminescence separation of kimberlite ore.Journal of Mineral Science, Vol. 54, 3, pp. 458-465.Russialuminescence

Abstract: Organic and inorganic luminophores of similar luminescence parameters as diamonds are selected. Indicators, based on the selected luminophores, are synthesized. Spectral and kinetic characteristics of luminophores are experimentally determined for making a decision on optimal compositions to ensure maximum extraction of diamonds in X-ray luminescence separation owing to extra recovery of non-luminescent diamond crystals. As the components of luminophore-bearing indicators, anthracene and K-35 luminophores are selected as their parameters conform luminescence parameters of diamonds detected using X-ray luminescence separator with standard settings.
DS1994-0437
1994
Podkuiko, Y.A.Dobrzhinetskaya, L.F., Braun, I.V., Sheskel, G.G., Podkuiko, Y.A.Geology and structure of diamond bearing rocks of the Kokchetav Massif, Kazahkstan.Tectonophysics, Vol. 233, No. 3-4, May 30, pp. 293-313.Russia, KazahkstanStructure, Diamondiferous rocks
DS1998-0924
1998
Podkuiko, Y.A.Makhotkin, I.L., Podkuiko, Y.A.Kimberlites of the Polar Ural region: a new geochemical type of kimberlitic rocks depleted in trace elements.Doklady Academy of Sciences, Vol. 361A, No. 6, pp. 993-8.Russia, UralsGeochemistry
DS2001-0719
2001
Podkuiko, Y.A.Mahotkin, I.L., Podkuiko, Y.A., Zhuravlev, D.Z.Early Paleozoic kimberlite melnoite magmatism of the Pri-Polar Urals and thAlkaline Magmatism -problems mantle source, pp. 151-60.GlobalMelnoite, Tectonics
DS200512-0677
2001
Podkuiko, Yu.A.Mahotkin, I.L., Podkuiko, Yu.A., Zhuravlev, D.Z.Early Paleozoic kimberlite melnoite magmatism of the Pre-Polar Urals and the geodynamic formation model.Alkaline Magmatism and the problems of mantle sources, pp. 151-160.Russia, UralsMelnoites
DS1993-1211
1993
Podkuyko, A.Pechnikov, V.A., Bobrov, V.A., Podkuyko, A.Isotopic compositions of diamond and accompanying graphite in north Kazakstan metamorphic rocks.Geochemistry International, Vol. 30, No. 8, pp. 153-157.Russia, KazakhstanGeochronology, Diamond morphology
DS2000-0162
2000
Podlachikov, Yu.Y.Cloetingh, S., Podlachikov, Yu.Y.Perspectives on tectonic modelingTectonophysics, Vol. 320, No. 3-4, May pp. 169-74.GlobalTectonics, Models
DS1994-1390
1994
Podlachikov, Yu.Yu.Podlachikov, Yu.Yu., Poliakov, A.N.B., Yuen, D.A.The effect of lithospheric phase transitions on subsidence of extending continental lithospheres.Earth and Planet. Science Letters, Vol. 124, No. 1-4, June pp. 95-104.MantleSubduction
DS201412-0599
2013
Podladchikov, Y.Moulas, E., Podladchikov, Y., Aranovich, L., Kostopoulos, D.The problem of depth in geology: when pressure does not translate into depth.Petrology, Vol. 21, 6, pp. 527-538.MantleDynamics
DS1995-2044
1995
Podladchikov, Y.Y.Weinberg, R.F., Podladchikov, Y.Y.The rise of solid state diapirsJournal of Structural Geology, Vol. 17, No. 8, pp. 1183-1195.GlobalDiapirs, Magma -crust not specific to kimberlites
DS1998-1511
1998
Podladchikov, Y.Y.Van Balen, R.T., Podladchikov, Y.Y., Cloetingh, S.A.P.L.A new multilayered model for intraplate stress induced differential subsidence of faulted lithosphere..Tectonics, Vol. 17, No. 6, Dec. pp. 938-54.GlobalBasins - rift, Subduction
DS200512-0941
2005
Podladchikov, Y.Y.Schmalholz, S.M., Podladchikov, Y.Y., Jamtveit, B.Structural softening of the lithosphere.Terra Nova, Vol. 17, 1, pp. 66-72.MantleTectonics
DS200812-0450
2008
Podladchikov, Y.Y.Hartz, E.H., Podladchikov, Y.Y.Toasting the jelly sandwich: the effect of shear hearting on lithospheric geotherms and strength.Geology, Vol. 36, 4, pp. 331-4.MantleGeothermometry
DS200812-1070
2008
Podladchikov, Y.Y.Simon, N.S.C., Podladchikov, Y.Y.The effect of mantle composition on density in the extending lithosphere.Earth and Planetary Science Letters, Vol. 272, 1-2, July 30, pp. 148-157.MantleDensity
DS201012-0051
2010
Podladchikov, Y.Y.Beuchert, M.J., Podladchikov, Y.Y.Viscoelastic mantle convection and lithospheric stresses.Geophysical Journal International, in press availableMantleGeotectonics
DS201012-0052
2010
Podladchikov, Y.Y.Beuchert, M.J., Podladchikov, Y.Y., Simon, N.S.C., Rupke, L.H.Modeling of craton stability using a viscoelastic rheology.Journal of Geophysical Research, Vol. 115, B 11, B11413.MantleRheology
DS201012-0682
2010
Podladchikov, Y.Y.Semprich, J., Simon, N.S.C., Podladchikov, Y.Y.Density variations in the thickened crust as a function of pressure, temperature and composition.International Journal of Earth Sciences, Vol. 99, 7, pp. 1487-1510.MantleGeophysics
DS201711-2507
2017
Podladchikov, Y.Y.Chu, X., Ague, J.J., Podladchikov, Y.Y., Tian, M.Ultrafast eclogite formation via melting induced overpressure.Earth and Planetary Science Letters, Vol. 479, pp. 1-17.Mantleeclogite

Abstract: The conventional wisdom holds that metamorphic reactions take place at pressures near-lithostatic so that the thermodynamic pressure, reflected by the mineral assemblage, is directly correlated with depth. On the other hand, recent field-based observations and geodynamic simulations suggest that heterogeneous stress and significant pressure deviations above lithostatic (overpressure) can occur in Earth's crust. Here we show that eclogite, normally interpreted to form at great depths in subduction zones and Earth's mantle, may form at much shallower depths via local overpressure generated in crustal shear zones. The eclogites studied crop out as lenses hosted by felsic paragneiss in a sheared thrust slice and represent a local pressure and temperature anomaly in the Taconic orogenic belt, southern New England. Sharply-defined chemical zones in garnet, which record ~5 kbar pressure rise and fall accompanied by a temperature increase of 150-200?°C, demonstrate extremely short timescales of diffusion. This requires anomalously fast compression (~500 yrs) and decompression. We use coupled phase equilibria and garnet diffusion forward modeling to fit the observed garnet profiles and test the likely paths using a Monte Carlo-type approach, accounting for off-center sectioning of garnet. The simulation shows that a ~5 kbar pressure increase after the temperature peak is necessary to reproduce the garnet zoning. Remarkably, this post-peak-T compression (from 9 kbar to 14 kbar) lasted only ~500 yrs. If the compression was due to burial along a lithostatic pressure gradient, the descent speed would exceed 30 m?yr-1, defying any observed or modeled subduction rates. Local overpressure in response to partial melting in a confined volume (Vrijmoed et al., 2009) caused by transient shear heating can explain the ultra-fast compression without necessitating burial to great depth.
DS1992-1183
1992
Podladchikov, Y.Yu.Perchuk, L.L., Podladchikov, Y.Yu., Polyakov, A.N.Hydrodynamic modelling of some metamorphic processesJournal of Metamorphic Geology, Vol. 10, No. 3, May pp. 311-320GlobalMetamorphic processes, Modelling
DS1993-0917
1993
Podladchikov, Yu.Yu.Litvinovsky, B.A., Podladchikov, Yu.Yu.Crustal anatexis during the influx of mantle volatilesLithos, Vol. 30, pp. 93-107MantleMantle model, Silicic magma
DS1975-0833
1978
Podlesskiy, K.K.Podlesskiy, K.K.Problem of Iron and Magnesium Partition between Coexisting Garnets and Spinels.Doklady Academy of Science USSR, Earth Science Section., Vol. 241, No. 1-6, PP. 156-159.RussiaKimberlite
DS201808-1757
2018
Podmogov, Y.Kertsman, V., Moilanen, J., Podmogov, Y.Special place of airborne electromagnetic survey in detailed exploration of kimberlites in the conditions of the Angolan shield. CatocaAEM2018/7th International Workshop on Airborne electromagnetics, Held June 17-20, 3p.Africa, Angolageophysics - EM
DS1995-0397
1995
Podmore, D.C.Dawes, P.R., Smithies, R.H., Centofanti, J., Podmore, D.C.Sunrise Hill unconformity: a newly discovered regional hiatus between Archean granites and greenstones ..Australian Journal of Earth Sciences, Vol. 42, pp. 635-639AustraliaPilbara Craton, Greenstone belt
DS1982-0498
1982
Podmore, F.Podmore, F.Progress Report: the First Bouguer Anomaly Map of ZimbabweGeological Society of South Africa Transactions, Vol. 85, PP. 127-133.ZimbabweGeophysics, Gravity, Geology
DS1990-1125
1990
Podmore, F.Nyblade, A.A., Pollack, H.N., Jones, D.L., Podmore, F.Terrestrial heat flow in east and southern AfricaJournal of Geophysical Research, Vol. 95, No. B 11, October 10, pp. 17371-17384South AfricaHeat Flow, Mantle
DS200412-1558
2004
Podolefsky, N.S.Podolefsky, N.S., Zhong, S., McNamara, A.K.The anisotropic and rheological structure of the oceanic upper mantle from a simple model of plate shear.Geophysical Journal International, Vol. 158, 1, pp. 287-296.MantleGeodynamics
DS200812-0903
2008
Podolsky, M.H.Podolsky, M.H., Seller, M.H., Kryvoshlyk, I.N., Seghedi, I., Maicher, D.Whole rock geochemistry investigations of the 5034 and Tuzo kimberlites and potential applications to improving geology and resource models, Gahcho Kue project, NWTNorthwest Territories Geoscience Office, p. 72. abstractCanada, Northwest TerritoriesDeposit - Gahcho Kue
DS1960-0803
1967
Podorina, YE. K.Burkov, V.V., Podorina, YE. K.First Dat a on Rare Earths in KimberliteDoklady Academy of Science USSR, Earth Science Section., Vol. 171, No. 1-6, PP. 215-219.RussiaBlank
DS1988-0076
1988
Podosek, F.A.Bowring, S.A., Arvidson, R.A., Podosek, F.A.The Missouri gravity low: evidence for a cryptic suture?Geological Society of America Abstracts with Program, Vol. 20, No. 2, January p. 91. Sth. Central, LawrenceMissouriBlank
DS1989-0156
1989
Podosek, F.A.Bowring, S.A., King, J.E., Housh, T.B., Isachsen, C.E., Podosek, F.A.Neodymium and lead isotope evidence for enriched early Archean crust in North AmericaNature, Vol. 340, No. 6230, July 20, pp. 222-224North AmericaGeochronology, Archean
DS1989-0157
1989
Podosek, F.A.Bowring, S.A., Podosek, F.A.neodymium isotope evidence from Wopmay Orogen for 2.0-2.4 Gacrust in Western north AmericaEarth and Planetary Science Letters, Vol. 94, pp. 217-230. Database # 18132Northwest TerritoriesOrogeny -Wopmay, Geochronology
DS1960-0523
1965
Podporina, YE. K.Burkov, V.V., Podporina, YE. K.Rare Elements in Kimberlite RocksDoklady Academy of Science USSR, Earth Science Section., Vol. 163, No. 1-6, PP. 169-172.RussiaBlank
DS201212-0380
2012
Podurets, K.M.Kovalenko, E.S., Shiryaev, A.A., Kaloyan, A.A., Podurets, K.M.X-ray tomographic study of spatial distribution of Micro inclusions in natural fibrous diamonds.Diamond and Related Materials, Vol. 30, pp. 31-41.TechnologyDiamond inclusion
DS1996-1605
1996
Podvigina, O.M.Zheligovskiy, V.A., Podvigina, O.M., Sadovskiy, A.M.Some properties of crustal structure in California as indicated by topography and bouguer anomalies...Doklady Academy of Sciences, Vol. 336, pp. 15-20.CaliforniaGeophysics -seismics, Tectonics -faulting
DS201812-2866
2018
Podvysotski, V.Podvysotski, V.Primary diamond placers of Cretaceous age in the Juina area. Mato Grosso State, Brazil7th Symposio Brasileiro de Geologia do Diamante , Title only South America, Brazil, Mato Grossodeposit - Juina
DS1995-1505
1995
Podvysotski, V.T.Podvysotski, V.T.Regularities of allocation and conditions of formation of ancient sedimentary collectors and diamond placers.Proceedings of the Sixth International Kimberlite Conference Almazy Rossii Sakha abstract, p. 32.Russia, YakutiaAlluvials, Placers, Deposit -Siberian Platform
DS201509-0419
2015
Podvysotski, V.T.Podvysotski, V.T., Bashinsli, S.I.A new dat a about Cretaceous Diamondiferous conglomerates in Juin a Province ( Mato Grosso state, Brazil).Vestnik VGU, Seria Geologia, IN RUSSIAN, No. 2, pp. 73-76.South America, Brazil, Mato GrossoDeposit - Juina area
DS1987-0584
1987
Podvysotskii, V.T.Podvysotskii, V.T.Ilmenite and titanomagnetite in the rocks of trapped formation of the Malo-Botuobinsky and Alakit-Markhinsky kimberlitic fields of Yakutian ProvinceDoklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 297, No. 3, pp. 690-695RussiaBlank
DS1987-0585
1987
Podvysotskii, V.T.Podvysotskii, V.T., Belov, E.N., Bessolitsyn, A.E., Lozovik, V.K.On the pre-middle carboniferous collector of kimberlitic minerals in The southwestern part of the Yakutian kimberliticprovinceDoklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 297, No. 1, pp. 170-174RussiaBlank
DS1998-1172
1998
Podvysotskii, V.T.Podvysotskii, V.T.The conditions of formation of sedimentary collectors and diamond placer son the Siberian PlatformDoklady Academy of Sciences, Vol. 361A, No. 6, pp. 790-4.Russia, SiberiaAlluvials, placers
DS200612-1173
2005
Podvysotskii, V.T.Romanko, E.F., Egorov, N.N., Podvysotskii, V.T., Sablukov, S.M., Dyakonov, D.B.A new Diamondiferous kimberlite region in southwestern Angola.Doklady Earth Sciences, Vol. 403A, 6, pp. 817-821.Africa, AngolaDiamond exploration
DS1982-0499
1982
Podvysotskiy, V.T.Podvysotskiy, V.T., Vladimirov, B.M., Ivanov, S.I., Kotelnikov.Serpentinization of KimberliteDoklady Academy of Sciences ACAD. NAUK USSR, EARTH SCI. SECTION., Vol. 256, No. 1-6, PP. 87-90.RussiaAlteration, Petrography
DS1984-0590
1984
Podvysotskiy, V.T.Podvysotskiy, V.T., Yegranova, I.G., Feoktistova, L.P.Magnetite in KimberliteDoklady Academy of Science USSR, Earth Science Section., Vol. 266, No. 1-6, MAY PP. 157-159.RussiaMineralogy, Inclusions, Udachanaya, Malaya Botuobuya, Daldyn
DS1985-0537
1985
Podvysotskiy, V.T.Podvysotskiy, V.T.Serpentine-carbonate Mineralization in KimberlitesInternational Geology Review, Vol. 27, No. 7, July pp. 810-823RussiaCalcite, Udachnaya, Carbonate
DS1985-0538
1985
Podvysotskiy, V.T.Podvysotskiy, V.T.Serpentine Carbonate Mineralization in KimberlitesInternational Geology Review, Vol. 27, No. 7, July pp. 810-823RussiaMineralogy
DS1985-0539
1985
Podvysotskiy, V.T.Podvysotskiy, V.T., Belov, E.N., Bessoliyisyn, A.E., Bialyi, V.I.Age of kimberlites and erosion truncation magnitude of the Malo- Botuoba region southwest Yakutia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 285, No. 5, pp. 1174-1177RussiaGeochronology
DS1987-0586
1987
Podvysotskiy, V.T.Podvysotskiy, V.T., Belov, Ye.N., Bessolitsyn, A.Ye., et al.Kimberlitic minerals of the reservoir rocks of pre-middle carboniferous Of the southwest of Yakutia Province.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 297, No. 1, pp. 170-174RussiaPetrology, Ultramafics
DS1987-0587
1987
Podvysotskiy, V.T.Podvysotskiy, V.T., Markov, A.S.Ilmenite and titanomagnetite in rocks of the Traprock association in the Malaya Botuobuya and the Alakit-Markha kimberlite fields, YakutiaDoklady Academy of Science USSR, Earth Science Section, Vol. 297, No. 6, Nov-Dec., pp. 144-148RussiaIlmenites, Titanomagnetite
DS1998-1173
1998
Podvysotsky, V.T.Podvysotsky, V.T., Zuev, V.M., Nikulin, LelyoukhConception of formation of magmatogene and terrigenous diamondiferous formations ancient platforms - forecast7th. Kimberlite Conference abstract, pp. 696-8.RussiaCraton, Magmatism
DS2000-0770
2000
Podvysotsky, V.T.Podvysotsky, V.T.Stages of shaping of magmatogene and terrigene Diamondiferous formations of the Siberian PlatformIgc 30th. Brasil, Aug. abstract only 1p.Russia, SiberiaMagmatism, Kimberlites and placers, alluvials
DS200712-0286
2007
Podvysotsky, V.T.Egorov, K.N., Ramnko, E.F., Podvysotsky, V.T., Sabulukov, S.M., Garanin, V.K., Dyakonov, D.B.New dat a on kimberlite magmatism in southwestern Angola.Russian Geology and Geophysics, Vol. 48, 4, pp. 323-336.Africa, AngolaMagmatism - kimberlites
DS1988-0149
1988
Podwysocki, M.Crowley, J., Rowan, M., Podwysocki, M., Meyer, D.Evaluation of airborne visible/infrared imaging spectrometer dat a of the Mountain Pass, California carbonatite complexNational Technical Information Service N89-22169/1, Jet Propulsion Lab. Calif. Institute Tech. Proceedings of, pp. 155-161CaliforniaCarbonatite, Remote Sensing
DS200712-0471
2007
Podyachev, B.Izbekov, E., Podyachev, B., Afanasev, V.Signs of symmetric diamond concentration in the eastern Siberian Platform.Doklady Earth Sciences, Vol. 411, 9, pp. 1339-1340.RussiaDiamond genesis
DS200712-0472
2007
Podyachev, B.Izbekov, E., Podyachev, B., Afanasev, V.Signs of symmetric diamond concentration in the eastern Siberian Platform.Doklady Earth Sciences, Vol. 411, 9, pp. 1339-1340.RussiaDiamond genesis
DS200712-0473
2006
Podyachev, B.P.Izbekov, E.D., Podyachev, B.P., Afanasev, V.P.Signs of symmetric diamond concentration in the eastern Siberian platform.Doklady Earth Sciences, Vol. 411, 9, Nov-Dec. pp. 1339-1340.Russia, SiberiaDiamond genesis
DS201012-0316
2009
Podyachev, B.P.Izbekov, E.D., Podyachev, B.P., Surnin, A.A.Minerageny ( spelling) of the Yakut buried basement uplift in the Siberian platform.Doklady Earth Sciences, Vol. 425, 2, April pp. 378-379.Russia, SiberiaTectonics
DS200612-1174
2006
Poe, B.T.Romano, C., Poe, B.T., Kreidie, N., McCammon, C.A.Electrical conductivities of pyrope almandine garnets up to 19 GPa and 1700 C.American Mineralogist, Vol. 91, 9, pp. 1371-1377.MantleDiscontinuity
DS202004-0534
2020
Poe, B.T.Stagno, V., Stopponi, V., Kono, Y., D'Arco, A., Lupi, S., Romano, C., Poe, B.T., Foustoukos, D.J., Scarlato, P., Manning, C.E.The viscosity and atomic structure of volatile bearing melililititic melts at high pressure and temperature and the transport of deep carbon.Minerals MDPI, Vol. 10, 267 doi: 10.23390/min10030267 14p. PdfMantleMelililite, carbon

Abstract: Understanding the viscosity of mantle-derived magmas is needed to model their migration mechanisms and ascent rate from the source rock to the surface. High pressure-temperature experimental data are now available on the viscosity of synthetic melts, pure carbonatitic to carbonate-silicate compositions, anhydrous basalts, dacites and rhyolites. However, the viscosity of volatile-bearing melilititic melts, among the most plausible carriers of deep carbon, has not been investigated. In this study, we experimentally determined the viscosity of synthetic liquids with ~31 and ~39 wt% SiO2, 1.60 and 1.42 wt% CO2 and 5.7 and 1 wt% H2O, respectively, at pressures from 1 to 4.7 GPa and temperatures between 1265 and 1755 °C, using the falling-sphere technique combined with in situ X-ray radiography. Our results show viscosities between 0.1044 and 2.1221 Pa•s, with a clear dependence on temperature and SiO2 content. The atomic structure of both melt compositions was also determined at high pressure and temperature, using in situ multi-angle energy-dispersive X-ray diffraction supported by ex situ microFTIR and microRaman spectroscopic measurements. Our results yield evidence that the T-T and T-O (T = Si,Al) interatomic distances of ultrabasic melts are higher than those for basaltic melts known from similar recent studies. Based on our experimental data, melilititic melts are expected to migrate at a rate ~from 2 to 57 km•yr-1 in the present-day or the Archaean mantle, respectively.
DS1989-1229
1989
Poelchau, H.S.Poelchau, H.S., Mann, U.Evolution of sedimentary basins- the integrated modeling approach. AnintroductionGeologische Rundschau, Vol. 78, No. 1, pp. 1-6. Database # 18160GlobalBasins, Modeling
DS201312-0937
2013
Poelchau, M.H.Vasconcelos, M.A.R., Crosta, A.P., Reimold, W.U., Goes, A.M., Kenkmann, T., Poelchau, M.H.The Serra da Cangalha impact structure, Brazil: geological, stratigraphic and petrographic aspects of a recently confirmed impact structure.Journal of South American Earth Sciences, Vol. 45, pp. 316-330.South America, BrazilMeteorite
DS201412-0452
2014
Poelchau, M.H.Kenkmann, T., Poelchau, M.H., Wulf, G.Structural geology of impact craters.Journal of Structural Geology, Vol. 62, pp. 156-182.GlobalReview - impact cratering
DS1940-0187
1948
Poese, W.Poese, W.Gem Stone LoreColorado Springs. Mineral Book Co., 54P.United StatesKimberlite
DS200712-0686
2007
Pogge Von Strandemann, P.A.E.Marschall, H.R., Pogge Von Strandemann, P.A.E., Seitz, H-M., Elliott, T., Niu, Y.The lithium isotopic composition of orogenic eclogites and deep subduction zones.Earth and Planetary Science Letters, In press availableMantleSubduction
DS200812-0715
2008
Pogge Von Strandmann, A.E.Marschall, H.R., Pogge Von Strandmann, A.E.Li and Mg exchange between eclogite lenses and their host rocks: evidence from isotope profiles.Goldschmidt Conference 2008, Abstract p.A594.TechnologyEclogite
DS201712-2693
2017
Pogge von Strandmann, A.E.Ionov, D.A., Doucet, L.S., Pogge von Strandmann, A.E., Golovin, A.V., Korsakov, A.V.Links between deformation, chemical enrichment and Li isotope compositions in the lithospheric mantle of the central Siberian craton.Chemical Geology, Vol. 475, pp. 105-121.Russia, Siberiacraton, geochronology

Abstract: We report the concentrations ([Li]) and isotopic compositions of Li in mineral separates and bulk rocks obtained by MC-ICPMS for 14 previously studied garnet and spinel peridotite xenoliths from the Udachnaya kimberlite in the central Siberian craton as well as major and trace element compositions for a new suite of 13 deformed garnet peridotites. The deformed Udachnaya peridotites occur at > 5 GPa; they are metasomatized residues of melt extraction, which as a group experienced greater modal and chemical enrichments than coarse peridotites. We identify two sub-groups of the deformed peridotites: (a) mainly cryptically metasomatized (similar to coarse peridotites) with relatively low modal cpx (< 6%) and garnet (< 7%), low Ca and high Mg#, sinusoidal REE patterns in garnet, and chemically unequilibrated garnet and cpx; (b) modally metasomatized with more cpx and garnet, higher Ca, Fe and Ti, and equilibrated garnet and cpx. The chemical enrichments are not proportional to deformation degrees. The deformation in the lower lithosphere is caused by a combination of localized stress, heating and fluid ingress from the pathways of ascending proto-kimberlite melts, with metasomatic media evolving due to reactions with wall rocks. Mg-rich olivine in spinel and coarse garnet Udachnaya peridotites has 1.2-1.9 ppm Li and d7Li of 1.2-5.0‰, i.e. close to olivine in equilibrated fertile to depleted off-craton mantle peridotites from literature data, whereas olivine from the deformed peridotites has higher [Li] (2.4-7.5 ppm) and a broader range of d7Li (1.8-11.6‰), which we attribute to pre-eruption metasomatism. [Li] in opx is higher than in coexisting olivine while ?7LiOl-Opx (d7LiOl - d7LiOpx) ranges from - 6.6 to 7.8‰, indicating disequilibrium inter-mineral [Li] and Li-isotope partitioning. We relate these Li systematics to interaction of lithospheric peridotites with fluids or melts that are either precursors of kimberlite magmatism or products of their fractionation and/or reaction with host mantle. The melts rich in Na and carbonates infiltrated, heated and weakened wall-rock peridotites to facilitate their deformation as well as produce high [Li] and variable, but mainly high, d7Li in olivine. The carbonate-rich melts preferentially reacted with the opx without achieving inter-mineral equilibrium because opx is consumed by such melts, and because of small volumes and uneven distribution of the metasomatic media, as well as short time spans between the melt infiltration and the capture of the wall-rock fragments by incoming portions of ascending kimberlite magma as xenoliths. Trapped interstitial liquid solidified as cryptic components responsible for high [Li] and the lack of d7Li balance between olivine and opx, and bulk rocks. Unaltered d26Mg values (0.20-0.26‰) measured in several olivine separates show no effects of the metasomatism on Mg-isotopes, apparently due to high Mg in the peridotites.
DS200812-0904
2008
Pogge Von Strandmann, P.A.E.Pogge Von Strandmann, P.A.E., Elliott, T., Ionov, D., Niu, Y.Li and Mg isotopes in the mantle: heterogeneity or diffusion?Goldschmidt Conference 2008, Abstract p.A754.MantleSubduction
DS201710-2256
2017
Pogge von Strandmann, P.A.E.Pogge von Strandmann, P.A.E., Desrochers, A., Murphy, M.J., Finlay, A.J., Selby, D., Lenton, T.M.Global climate stabilisation by chemical weathering during the Hirnantian glaciation.Geochemical Perspectives Letters, Vol. 3, pp. 230-237.Canada, Quebec, Anticosti Islandcarbon cycle

Abstract: Chemical weathering of silicate rocks is a primary drawdown mechanism of atmospheric carbon dioxide. The processes that affect weathering are therefore central in controlling global climate. A temperature-controlled “weathering thermostat” has long been proposed in stabilising long-term climate, but without definitive evidence from the geologic record. Here we use lithium isotopes (d7Li) to assess the impact of silicate weathering across a significant climate-cooling period, the end-Ordovician Hirnantian glaciation (~445 Ma). We find a positive d7Li excursion, suggestive of a silicate weathering decline. Using a coupled lithium-carbon model, we show that initiation of the glaciation was likely caused by declining CO2 degassing, which triggered abrupt global cooling, and much lower weathering rates. This lower CO2 drawdown during the glaciation allowed climatic recovery and deglaciation. Combined, the data and model provide support from the geological record for the operation of the weathering thermostat.
DS201801-0024
2017
Pogge von Strandmann, P.A.E.Ionov, D.A., Doucet, L.S., Pogge von Strandmann, P.A.E., Golovin, A.V., Korsakov, A.V.Links between deformation, chemical enrichments and Li-isotope compositions in the lithospheric mantle of the central Siberian craton.Chemical Geology, Vol. 475, pp. 105-121.Russiadeposit - Udachnaya

Abstract: We report the concentrations ([Li]) and isotopic compositions of Li in mineral separates and bulk rocks obtained by MC-ICPMS for 14 previously studied garnet and spinel peridotite xenoliths from the Udachnaya kimberlite in the central Siberian craton as well as major and trace element compositions for a new suite of 13 deformed garnet peridotites. The deformed Udachnaya peridotites occur at > 5 GPa; they are metasomatized residues of melt extraction, which as a group experienced greater modal and chemical enrichments than coarse peridotites. We identify two sub-groups of the deformed peridotites: (a) mainly cryptically metasomatized (similar to coarse peridotites) with relatively low modal cpx (< 6%) and garnet (< 7%), low Ca and high Mg#, sinusoidal REE patterns in garnet, and chemically unequilibrated garnet and cpx; (b) modally metasomatized with more cpx and garnet, higher Ca, Fe and Ti, and equilibrated garnet and cpx. The chemical enrichments are not proportional to deformation degrees. The deformation in the lower lithosphere is caused by a combination of localized stress, heating and fluid ingress from the pathways of ascending proto-kimberlite melts, with metasomatic media evolving due to reactions with wall rocks. Mg-rich olivine in spinel and coarse garnet Udachnaya peridotites has 1.2-1.9 ppm Li and d7Li of 1.2-5.0‰, i.e. close to olivine in equilibrated fertile to depleted off-craton mantle peridotites from literature data, whereas olivine from the deformed peridotites has higher [Li] (2.4-7.5 ppm) and a broader range of d7Li (1.8-11.6‰), which we attribute to pre-eruption metasomatism. [Li] in opx is higher than in coexisting olivine while ?7LiOl-Opx (d7LiOl - d7LiOpx) ranges from - 6.6 to 7.8‰, indicating disequilibrium inter-mineral [Li] and Li-isotope partitioning. We relate these Li systematics to interaction of lithospheric peridotites with fluids or melts that are either precursors of kimberlite magmatism or products of their fractionation and/or reaction with host mantle. The melts rich in Na and carbonates infiltrated, heated and weakened wall-rock peridotites to facilitate their deformation as well as produce high [Li] and variable, but mainly high, d7Li in olivine. The carbonate-rich melts preferentially reacted with the opx without achieving inter-mineral equilibrium because opx is consumed by such melts, and because of small volumes and uneven distribution of the metasomatic media, as well as short time spans between the melt infiltration and the capture of the wall-rock fragments by incoming portions of ascending kimberlite magma as xenoliths. Trapped interstitial liquid solidified as cryptic components responsible for high [Li] and the lack of d7Li balance between olivine and opx, and bulk rocks. Unaltered d26Mg values (0.20-0.26‰) measured in several olivine separates show no effects of the metasomatism on Mg-isotopes, apparently due to high Mg in the peridotites.
DS200712-0687
2007
Pogge von Stranmann, P.A.E.Marschall, H.R., Pogge von Stranmann, P.A.E., Seit, H-M., Elliott, NiuThe lithium isotopic composition of orogenic eclogites and deep subducted slabs.Earth and Planetary Science Letters, Vol. 262, 3-4, Oct. 30, pp. 563-580.MantleSubduction
DS1860-0159
1871
Poggendorff, J.C.Poggendorff, J.C.Bemerkungen Uber den Diamant aus BohmenBeilage Zur Zeitschrift Lotos, 2P.Europe, Czech RepublicDiamond Occurrence
DS1989-1230
1989
Pognante, U.Pognante, U., Sandrone, R.Eclogites in the northern Dora-Maira Nappe, Western Alps, ItalyMineralogy and Petrology, Vol. 40, No. 1, March pp. 57-72ItalyEclogite
DS1991-1359
1991
Pognante, U.Pognante, U.Shoshonitic and ultrapotassic post-collisional dykes from northern Karakorum (Sinkiang China)Lithos, Vol. 26, No. 3/4 January pp. 305-316ChinaShoshonite, Alkaline
DS1970-0405
1971
Pogorelov, B.S.Sarkisyan, S.G., Pogorelov, B.S.Ultramafic Basement Rocks of the West Siberian PlateDoklady Academy of Sciences USSR EARTH SCI., Vol. 200, No. 1-6, PP. 74-76.RussiaKimberlite
DS201012-0314
2010
Pogramoskaya, O.E.Ivanov, K.S., Valizer, P.M., Erokhin, Yu.V., Pogramoskaya, O.E.Genesis of carbonatites of fold belts ( exemplified by the Urals).Doklady Earth Sciences, Vol. 435, 1, pp. 1423-1426.Russia, UralsCarbonatite
DS1960-0346
1963
Pogson, D.J.Gibbons, G.S., Pogson, D.J.Report on the Airly Mountain Diamond ProspectNew South Wales Geological Survey Report., GS 1963/001, (UNPUBL.).AustraliaKimberlite
DS1960-0347
1963
Pogson, D.J.Gibbons, G.S., Pogson, D.J.Diamond Deposits at Mount Rose, Copeton, New South WalesNew South Wales Geological Survey Report., GS 1963/002, (UNPUBL.).AustraliaKimberlite
DS1960-0348
1963
Pogson, D.J.Gibbons, G.S., Webster, S.S., Pogson, D.J.Investigations of Airly Mountains Diamond ProspectNew South Wales Geological Survey Report., GS 1963/064, (UNPUBL.).AustraliaKimberlite
DS1994-1722
1994
Pogson, R.E.Sutherland, F.L., Raynor, L.R., Pogson, R.E.Spinel to garnet lherzolite transition in relation to high temperaturepaleogeotherms, eastern Australia.Australian Journal of Earth Sciences, Vol. 41, No. 3, June pp. 205-220.AustraliaGeothermometry, Lherzolite, xenoliths
DS1998-1428
1998
Pogson, R.E.Sutherland, F.L., Pogson, R.E., Barron, B.J.Paleothermal gradients in Australia: key to 4 D lithospheremapping....reply to O'Reilly, Griffin, GaulAustralian Journal of Earth Sciences, Vol. 45, No. 5, Oct. 1, pp. 817-21.AustraliaGeothermometry, Mantle - mapping
DS200512-1066
2004
Pogson, R.E.Sutherland, F.L., Hollis, J.D., Birch, W.D., Pogson, R.E., Raynor, L.R.Cumulate rich xenolith suite in Late Cenozoic basaltic eruptives, Hepburn Lagoon, Newlyn in relation to western Victorian lithosphere.Australian Journal of Earth Sciences, Vol. 51, 3, pp. 319-337.Australia, VictoriaXenoliths
DS1859-0037
1826
Pogson, W.H.Pogson, W.H.History of BoondelasCalcutta:, PP. 169-IndiaHistory
DS1975-0876
1978
Pogudin, I.A.Sudorov, V.A., Pogudin, I.A., Trusevich, B.B.Testing an Induced Polarization Method in Diamond DepositsRazved. Okhr. Nedr. Sssr., No. 4, PP. 44-46.RussiaKimberlite, Geophysics
DS201705-0890
2017
Pohanka, M.Xu, C., Kynicky, J., Tao, R., Liu, X., Zhang, L., Pohanka, M., Song, W., Fei, Y.Recovery of an oxidized majorite inclusion from Earth's deep asthenosphere.Science Advances, Vol. 3, 4, e1601589MantleEclogite

Abstract: Minerals recovered from the deep mantle provide a rare glimpse into deep Earth processes. We report the first discovery of ferric iron-rich majoritic garnet found as inclusions in a host garnet within an eclogite xenolith originating in the deep mantle. The composition of the host garnet indicates an ultrahigh-pressure metamorphic origin, probably at a depth of ~200 km. More importantly, the ferric iron-rich majoritic garnet inclusions show a much deeper origin, at least at a depth of 380 km. The majoritic nature of the inclusions is confirmed by mineral chemistry, x-ray diffraction, and Raman spectroscopy, and their depth of origin is constrained by a new experimental calibration. The unique relationship between the majoritic inclusions and their host garnet has important implications for mantle dynamics within the deep asthenosphere. The high ferric iron content of the inclusions provides insights into the oxidation state of the deep upper mantle.
DS201610-1888
2016
Pohilenko, N.P.Mikhailenko, D.S., Korsakov, A.V., Golovin, A.V., Zelenovskiy, P.S., Pohilenko, N.P.The first finding of graphite inclusion in diamond from mantle rocks: the result of the study of eclogite xenolith from Udachnaya pipe ( Siberian craton).Doklady Earth Sciences, Vol. 469, 2, pp. 870-873.RussiaDeposit - Udachnaya

Abstract: A xenolith of eclogite from the kimberlite pipe Udachnaya-East, Yakutia Grt+Cpx+Ky + S + Coe/Qtz + Dia + Gr has been studied. Graphite inclusions in diamond have been studied in detail by Confocal Raman (CR) mapping. The graphite inclusion in diamond has a highly ordered structure and is characterized by a substantial shift in the band (about 1580 cm-1) by 7 cm-1, indicating a significant residual strain in the inclusion. According to the results of FTIR spectroscopic studies of diamond crystals, a high degree of nitrogen aggregation has been detected: it is present mainly in form A, which means an "ancient" age of the diamonds. In the xenolith studied, the diamond formation occurred about 1 Byr, long before their transport by the kimberlite melt, and the conditions of the final equilibrium were temperatures of 1020 ± 40°C at 4.7 GPa. Thus, these graphite inclusions found in a diamond are the first evidence of crystallization of metastable graphite in a diamond stability field. They were formed in rocks of the upper mantle significantly below (=20 km) the graphite-diamond equilibrium line.
DS201112-0330
2011
Pohl, F.Fonseca, R.O., Luguet, A., Ballhaus, C., Pohl, F.Experimental constraints on the development of Os isotopic heterogeneity in the Earth's mantle.Goldschmidt Conference 2011, abstract p.858.MantleMelting - tracer
DS1987-0588
1987
Pohl, J.Pohl, J.Research in terrestrial impact structuresBraunschweig Wiesbaden Vieweg, 140pBrazil, Ontario, Texas, GermanyImpact, Tectonics
DS1990-0525
1990
Pohl, R.O.Geballe, T.H., Pohl, R.O., Seitz, R.Cool diamonds. Letters to Science in response to E. Marshall's articleScience, Vol. 250, November 30, pp. 1194-1195GlobalDiamond synthesis, Thermal conductivity
DS1985-0540
1985
Pohl, W.Pohl, W.Probable Kimberlite Indicator Plants in Western KenyaGeological Survey of Kenya, in: Geology for the development of Kenya, Publishing No., p. 66. abstract onlyKenyaProspecting
DS1994-1391
1994
Pohl, W.Pohl, W.Metallogeny of the northeastern Kibara belt, Central Africa- recentperspectivesOre Geology Reviews, Vol. 9, pp. 105-130Zambia, Angola, Zaire, Burundi, Tanzania, RwandaMetallogeny
DS201412-0694
2014
Pohwat, P.W.Pohwat, P.W.Connoisseur's choice: diamond, Dutoitspan mine, Kimberley, Northern Cape Province, South Africa.Rocks and Minerals, Jan-Feb. pp.54-65.Africa, South AfricaDeposit - Dutoitspan
DS1990-0906
1990
Poidebin, J.L.Lavreau, J., Poidebin, J.L., Lendent, D., Liegeois, J.P., Weis, D.Contribution to the geochronology of the basement of the Central AfricanRepublicJournal of African Earth Sciences, Vol. 11, No. 1/2, pp. 69-82Central African RepublicGeochronology, Tectonics
DS1996-1126
1996
Poidevin, J.L.Poidevin, J.L., Alvarez, P.Un segment proximal de rampe carbonatee d'age proterozoique superieur au Nord du Craton d'Afrique..Journal of African Earth Sciences, Vol. 23, No. 2, August pp. 257-266Central African RepublicProterozoic, Craton, stratigraphy
DS1994-1392
1994
Poidevin, J-L.Poidevin, J-L.Boninite like rocks from Paleoproterozoic greenstone belt of Bogain, CAR:geochemistry and petrogenesisPrecambrian Research, Vol. 68, No. 1/2, June pp. 97-114Central African RepublicProterozoic, Geochemistry
DS201412-0101
2014
Poikhilenko, L.N.Carmody, L., Taylor, L.A., Thaisen, K.G., Tychkov, N., Bodnar, R.J., Sobolev, N.V., Poikhilenko, L.N., Poikilenko, N.P.Ilmenite as a diamond indicator mineral in the Siberian craton: a tool to predict diamond potential.Economic Geology, Vol. 109, no. 3, pp. 775-783.RussiaIlmenite, chemistry
DS201412-0373
2014
Poikhilenko, L.N.Howarth, G.H., Barry, P.H., Pernet-Fisher, J.F., Baziotis, I.P., Pokhilenko, N.P., Poikhilenko, L.N., Bodnar, R.L., Taylor, L.A., Agashev, A.M.Superplume metasomatism: evidence from Siberian mantle xenoliths.Lithos, Vol. 184-187, pp. 209-224.RussiaMetasomatism
DS201412-0695
2014
Poikhilenko, L.N.Poikhilenko, N.P., Afanasiev, V.P., Agashev, A.M., Malkovets, V.G., Poikhilenko, L.N.New archean terranes with thick lithosphere of arctic regions of Siberia and North American ancient platforms: are they prospective for Diamondiferous kimberlites?30th. International Conference on Ore Potential of alkaline, kimberlite and carbonatite magmatism. Sept. 29-, Russia, CanadaKimberlite
DS201412-0696
2014
Poikhilenko, L.N.Poikhilenko, N.P., Afanasiev, V.P., Poikhilenko, L.N.Polymict breccia xenolith from Noyabrskaya pipe.30th. International Conference on Ore Potential of alkaline, kimberlite and carbonatite magmatism. Sept. 29-, Russia, SiberiaDeposit - Noyabrskaya
DS201012-0470
2010
Poikhilenko, N.Malkovets, V., Griffin, W., Poikhilenko, N., O'Reilly, S., Mishenin, S.Thickness of diamond bearing metasomatic aureoles in the cratonic SCLM.Goldschmidt 2010 abstracts, PosterMantleDiamond genesis
DS201312-0649
2012
Poikhilenko, N.P.Nikolenko, E.I., Afanasev, V.P., Chepurov, A.I., Sonin, V.M., Poikhilenko, N.P.Experimental study of the interaction between emoilmenite and kimberlite melt at a pressure of 2 Gpa.Doklady Earth Sciences, Vol. 447, 2, pp. 1306-1309.Africa, GuineaDeposit - Massadou
DS201412-0695
2014
Poikhilenko, N.P.Poikhilenko, N.P., Afanasiev, V.P., Agashev, A.M., Malkovets, V.G., Poikhilenko, L.N.New archean terranes with thick lithosphere of arctic regions of Siberia and North American ancient platforms: are they prospective for Diamondiferous kimberlites?30th. International Conference on Ore Potential of alkaline, kimberlite and carbonatite magmatism. Sept. 29-, Russia, CanadaKimberlite
DS201412-0696
2014
Poikhilenko, N.P.Poikhilenko, N.P., Afanasiev, V.P., Poikhilenko, L.N.Polymict breccia xenolith from Noyabrskaya pipe.30th. International Conference on Ore Potential of alkaline, kimberlite and carbonatite magmatism. Sept. 29-, Russia, SiberiaDeposit - Noyabrskaya
DS201810-2325
2018
Poikhilenko. N.P.Gromilov, S.A., Afanasiev, V.P., Poikhilenko. N.P.Moissanites of the Popigai astrobleme.Doklady Earth Sciences, Vol. 481, 2, pp. 997-999.Russiamoissanite

Abstract: Moissanites were found in tagamites of the Popigai meteorite crater along with impact diamonds. We have studied 55 samples including 49 individual polytypes and six intergrowths. The numbers of 6H, 15R, 4H, 6H/15R, and 6H/4H polytypes are 82, 7, 5, 4, and 2%, respectively. By the assemblage of polytypes, the moissanites of the Popigai astrobleme are distinct from kimberlite moissanites, as well as from synthetic SiC, which is characterized by the absence of the 4H polytype and the presence of more diverse inclusions (including Fe-bearing). The Popigai astrobleme is one of few objects with reliable natural moissanite. Technogenic contamination is excluded, since any researcher can find this mineral in tagamites.
DS201606-1095
2016
Poikilanko, N.P.Ilyina, O.V., Tychkov, N.S., Agashev, A.M., Golovin, A.V., Izokh, A.E., Kozmenko, O.A., Poikilanko, N.P.PGE distribution in deformed lherzolites of the Udachnaya kimberlite pipe ( Yakutia).Doklady Earth Sciences, Vol. 467, 2, pp. 408-411.Russia, YakutiaDeposit - Udachnaya

Abstract: The results of the first study of the PGE distribution in deformed lherzolites of the Udachnaya kimberlite pipe (Yakutia) are presented here. The complex character of evolution of the PGE composition in the Deformed lherzolites is assumed to be the result of silicate metasomatism. At the first stage, growth in the amount of clinopyroxene and garnet in the rock is accompanied by a decrease in the concentration of the compatible PGE (Os, Ir). During the final stage, the rock is enriched with incompatible PGE (Pt, Pd) and Re possible due to precipitation of submicron-sized particles of sulfides in the interstitial space of these mantle rocks.
DS201112-1062
2011
Poikilenko, N.Tychkov, N., Agashev, N., Poikilenko, N., Bazhan, I.Estimation of the refertilization grade of lithosphere roots by the chemical composition of garnets from Siberian kimberlites.Doklady Earth Sciences, Vol. 439, 2, pp. 1175-1178.Russia, SiberiaGarnet geochemistry
DS201212-0673
2012
Poikilenko, N.Smith, B., Baziotis, I., Carmody, L., Liu, Y.,Taylor, L.A., Poikilenko, N.The subcontinental lithospheric mantle of the NE Siberian craton: peridotites from Obnazhennaya.GSA Annual Meeting, Paper no. 249-7, abstractRussiaDeposit - Obnazhennaya
DS201412-1007
2014
Poikilenko, N.Yelisseyev, A., Khrenov, A., Afanasiev, V., Pustavarov, V., Gromilov, S., Panchenko, A., Poikilenko, N., Litasov, K.Luminesence of impact diamonds from the Popigai astrobleme.V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractRussia, SiberiaDiamond luminescence
DS201212-0004
2012
Poikilenko, N.P.Afanasiev, V.P., Poikilenko, N.P.Abrasion of diamond: an experimental study and field evidence.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractRussia, YakutiaDiamond morphology
DS201412-0101
2014
Poikilenko, N.P.Carmody, L., Taylor, L.A., Thaisen, K.G., Tychkov, N., Bodnar, R.J., Sobolev, N.V., Poikhilenko, L.N., Poikilenko, N.P.Ilmenite as a diamond indicator mineral in the Siberian craton: a tool to predict diamond potential.Economic Geology, Vol. 109, no. 3, pp. 775-783.RussiaIlmenite, chemistry
DS201412-0308
2014
Poikilenko, N.P.Goryainov, S.V., Likhacheva, A.Y., Rashchenko, S.V., Shubin, A., Afanasev,V.P., Poikilenko, N.P.Raman identification of lonsdalaeite in Popigai impactites.Journal of Raman Spectroscopy, Vol. 45, 4, pp. 305-313.RussiaLonsdaleite
DS201502-0091
2015
Poikilenko, N.P.Poikilenko, N.P., Agashev, A.M., Litasov, K.D., Pokhilenko, L.N.Carbonatite metasomatism of peridotite lithospheric mantle: implications for diamond formation and carbonatite-kimberlite magmatism.Russian Geology and Geophysics, Vol. 56, 1, pp. 280-295.MantleCarbonatite
DS201608-1447
2016
Poikilenko, N.P.Ugapeva, S.S., Pavlushin, A.D., Goryainov, S.V., Afanasiev, V.P., Poikilenko, N.P.Comparative characteristics of diamonds with olivine inclusions from the Ebelyakh placer and kimberlite pipes of the Yakutian Diamondiferous province.Doklady Earth Sciences, Vol. 468, 1, pp. 473-477.RussiaDeposit - Mir, Aykhal, Udachnaya, XXII Congress

Abstract: The results of morphological examination and the character of the structural orientation and estimation of residual pressure calculated from spectra of combination dispersion in olivine inclusions within diamonds of the Ebelyakh placer and kimberlite pipes of the Yakutian Diamondiferous Province are presented. The data analysis aimed at revealing indications of similarity and/or differences between diamonds from the pipes and the placer. Differences in the structural orientation and spectra of combination dispersion of the inclusions of olivine in dodecahedroids of placers of the northeastern part of the Siberian Platform support the assumption of their non-kimberlite nature.
DS1920-0396
1928
Poindexter, O.F.Poindexter, O.F.Constituents of Diamond Bearing Black Sands from Angola, Portuguese West Africa.American Mineralogist., Vol. 13, PP. 236-237.AngolaMineralogy, Alluvial Diamond Placers, Heavy Mineral Concentrate
DS1988-0432
1988
Pointing, A.J.Maguire, P.K.H., Shah, E.R., Pointing, A.J., Cooke, P.A.V., KhanThe seismicity of KenyaJournal of African Earth Sciences, Vol. 7, No. 7-8, pp. 915-924KenyaGeophysics
DS201808-1779
2018
Pointon, M.Pointon, M.De Beers's diamond mine in 1880's: Robert Harris and the Kimberley Searching System.History of Photography, Vol. 42, 1, pp. 4-24.Africa, South Africahistory

Abstract: In the mid 1880s a little-known photographer named Robert Harris produced a series of albumen prints showing the stages of body searching that black labourers in De Beers diamond mines were obliged to undergo by state ordinance enacted in 1883. The original photographs surfaced briefly in the sale-room in 2007 but have since disappeared. Two sets of copies survive. Bearing in mind the history of documentary photography in South Africa, this essay examines the historical and textual significance of this series of photographs in the context of the history of mining and discusses the imperatives and ethics of locating, researching and publishing controversial imagery in the internet age.
DS201810-2368
2018
Pointon, M.Pointon, M.De Beer's diamond mine in the 1880's: Robert Harris and the Kimberley searching system.History of Photography, Vol. 42, 1, pp. 4-24. doi.org/10.1080/ 03087298.2018. 1429095Africa, South Africadeposit - Kimberley

Abstract: In the mid 1880s a little-known photographer named Robert Harris produced a series of albumen prints showing the stages of body searching that black labourers in De Beers diamond mines were obliged to undergo by state ordinance enacted in 1883. The original photographs surfaced briefly in the saleroom in 2007 but have since disappeared. Two sets of copies survive. Bearing in mind the history of documentary photography in South Africa, this article examines the historical and textual significance of this series of photographs in the context of the history of mining and discusses the imperatives and ethics of locating, researching, and publishing controversial imagery in the Internet age.
DS2001-0824
2001
PoirierNarteau, C., Le Mouel, Poirier, Sepulveda, ShnirmanOn a small scale roughness of the core mantle boundaryEarth and Planetary Science Letters, Vol. 191, No. 1-2, Aug. 30, pp. 49-60.MantleCore - boundary
DS201910-2295
2019
Poirier, A.Rizo, H., Abdrault, D., Bennett, N.R., Humayun, M., Brandon, A., Vlastelic, I., Moine, B., Poirier, A., Bouhifd, M.A., Murphy, D.T.182W evidence for core-mantle interaction in the source of mantle plumes.Geochemical Perspectives Letters, Vol. 11, pp. 6-11.Mantlemantle plumes, hotspots

Abstract: Tungsten isotopes are the ideal tracers of core-mantle chemical interaction. Given that W is moderately siderophile, it preferentially partitioned into the Earth’s core during its segregation, leaving the mantle depleted in this element. In contrast, Hf is lithophile, and its short-lived radioactive isotope 182Hf decayed entirely to 182W in the mantle after metal-silicate segregation. Therefore, the 182W isotopic composition of the Earth’s mantle and its core are expected to differ by about 200 ppm. Here, we report new high precision W isotope data for mantle-derived rock samples from the Paleoarchean Pilbara Craton, and the Réunion Island and the Kerguelen Archipelago hotspots. Together with other available data, they reveal a temporal shift in the 182W isotopic composition of the mantle that is best explained by core-mantle chemical interaction. Core-mantle exchange might be facilitated by diffusive isotope exchange at the core-mantle boundary, or the exsolution of W-rich, Si-Mg-Fe oxides from the core into the mantle. Tungsten-182 isotope compositions of mantle-derived magmas are similar from 4.3 to 2.7 Ga and decrease afterwards. This change could be related to the onset of the crystallisation of the inner core or to the initiation of post-Archean deep slab subduction that more efficiently mixed the mantle.
DS2003-0260
2003
Poirier, G.Clements, B., Lucas, R., Birkett, T., Poirier, G., Bertrand, P.The Diamondiferous Renard cluster, Otish Mountains region, Quebec: an explorationCordilleran Exploration Roundup, p. 82-3, abstract.Quebec, Otish MountainsNews item, Ashton, Soquem
DS2003-1087
2003
Poirier, G.Poirier, G., et al.Diamond potential of the Renard cluster, Foxtrot property, Monts Otish, QuTbecQuebec Exploration 2003, diamond session, 1 page, extended abstractQuebecRenard pipes - diamond potential
DS2003-1088
2003
Poirier, G.Poirier, G., Bertrand, P., Birkett, T., Clements, B., Lucas, R.T.Diamond potential of the Renard cluster, Foxtrot property, Monte Otish QuebecQuebec Exploration Conference, Nov. 25-27, 1p. abstractQuebec, Otish MountainsGeology - Renard, Ashton, Soquem
DS200412-0195
2003
Poirier, G.Boyd, R., Clement, B., Lucas, R.,Birkett, T., Poirier, G., Bertrand, P.The Diamondiferous Renard cluster, Otish Mountains region, Quebec.Geological Association of Canada Annual Meeting, Abstract onlyCanada, QuebecGeology
DS200412-1559
2003
Poirier, G.Poirier, G., Bertrand, P., Birkett, T., Clements, B., Lucas, R.T.Diamond potential of the Renard cluster, Foxtrot property, Monte Otish Quebec.Quebec Exploration Conference, Nov. 25-27, 1p. abstractCanada, Quebec, Otish MountainsGeology - Renard, Ashton, Soquem
DS201503-0169
2015
Poirier, G.Poirier, G.Renard: Quebec's first diamond mine.PDAC 2015, Abstract, 1p.Canada, QuebecDeposit - Renard
DS202011-2043
2019
Poirier, G.Horvath, L., Gault, R.A., Pfenninger-Horvath, Poirier, G.Mont Saint-Hilaire: history, geology, mineralogy.The Canadian Mineralogist, Special Publication 14, 634p. Canada, QuebecBook

Abstract: This paper introduces a special section of the Canadian Journal of Development Studies, "The Africa Mining Vision: A Manifesto for More Inclusive Extractive Industry-Led Development?" Conceived by African ministers "in charge of mineral resources" with inputs and guidance from African Union Heads of State, the Africa Mining Vision (AMV) was officially launched in February 2009. The papers presented in this special section reflect critically on progress that has since been made with operationalising the AMV at the country level across Africa; the general shortcomings of the manifesto; and the challenges that must be overcome if the continent is to derive g Taking over 20 years of meticulous preparation, László and Elsa Horváth, a duo of dedicated and dynamic amateur mineralogists, along with two researchers, Robert Gault, a mineralogist, and Glenn Poirier, a geologist, have produced the ultimate book "Mont Saint-Hilaire: History, Geology, Mineralogy". The photography captures the colors of Vásárely, the symmetry of Escher, the form of Bartók and the intricate patterns of Mandelbrot, all found here, in this miracle of nature. One cannot but marvel at how this single, small quarry contains such mineral diversity. At last count, over 434 mineral species have been found at Mont Saint-Hilaire, representing 9% of all known mineral species. The 66 type minerals first described from this locality represent 1.3 % of all mineral species, placing the Poudrette quarry in an extremely rarified class for worldwide mineral localities. Almost half, 47, of all known chemical elements are included in this mineral mix. Beginning some 124 million years ago, several million years and a variety of geological processes were needed to accomplish this assemblage. Be captivated, learn and, most of all, enjoy!reater economic benefit from its abundant mineral wealth.
DS1989-0869
1989
Poirier, G.G.Leclair, A.D., Poirier, G.G.The Kapuskasing uplift in the Kapuskasing area, OntarioGeological Survey of Canada Current Research, Paper No. 89-lC, pp. 225-234Ontario, MidcontinentStructure, Tectonics
DS1992-1235
1992
Poirier, J.P.Price, G.D., Poirier, J.P.Dislocation melting of mantle mineralsEos, Transactions, Annual Fall Meeting Abstracts, Vol. 73, No. 43, October 27, abstracts p. 599.MantleMineralogy, Enstatite melting point
DS1995-0021
1995
Poirier, J.P.Allegre, C.J., Poirier, J.P., Hofmann, A.W.The chemical composition of the earthEarth and Planetary Science Letters, Vol. 134, No. 3-4, Sept. 1, pp. 515-526.GlobalGeochemistry, Composition -chemical
DS2001-0647
2001
Poirier, J.P.Labroose, S., Poirier, J.P., Lemouel, J.L.The age of the inner coreEarth and Planetary Science Letters, Vol. 190, No. 3-4, pp. 111-123.MantleCore - boundary, Geochronology
DS2002-0914
2002
Poirier, J.P.Langenhorst, F., Poirier, J.P.Transmission electron microscopy of coesite inclusions in the Dora Maira high pressure metamorphic pyrope quartzite.Earth and Planetary Science Letters, Vol. 203, 3-4, pp. 793-803.EuropeCoesite - inclusions, UHP, ultra high pressure
DS1993-1433
1993
Poirier, J-P.Shankland, T.J., Peyronneau, J., Poirier, J-P.Electrical conductivity of the earth's lower mantleNature, Vol. 366, No. 6454, December 2, pp. 453-455.MantleGeophysics- seismics
DS1995-1151
1995
Poirier, J-P.Malavergne, V., Guyot, F., Peyronneau, J., Poirier, J-P.Distribution du fer, cobalt, nickel, entre mineraux du manteau inferieurterrestre haute pressure/temperatureCompte Rendus Sci. Paris., (in French), Vol. 320, II a, pp. 455-462.MantlePerovskite, Microscopy
DS1988-0547
1988
Poirier, M.Poirier, M.Diamond tools- evolution or revolution?Dimensional Stone, April/May, pp. 38-39GlobalBlank
DS2003-0147
2003
Poirier G.Boyd, R., Clement, B., Lucas, R., Birkett, T., Poirier G., Bertrand, P.The Diamondiferous Renard cluster, Otish Mountains region, QuebecGeological Association of Canada Annual Meeting, Abstract onlyQuebecGeology
DS1983-0402
1983
Poirot, J.P.Leung, C.S., Merigoux, H., Poirot, J.P., Zecchini, P.Identification of precious stones and synthesis by infraredspectroscopy.(in French)Revue de Gemmologie, (in French), Vol. 75, pp. 14-15GlobalSpectroscopy
DS1910-0558
1918
Poitevin, E.Poitevin, E., Graham, R.P.D.Contribution to the Mineralogy of Black Lake Area, QuebecGeological Survey of Canada (GSC) MUSEUM Bulletin., No. 27; ( GEOL. SERIES No. 35) 103P.Canada, QuebecBlank
DS201604-0622
2016
Poitras, S.Poitras, S., Pearson, D.G., Stachel, T., Cairns, S., Day, S.A geochemical study of diamond indicator minerals from the NWT Interior Platform.GAC MAC Meeting Special Session SS11: Cratons, kimberlites and diamonds., abstract 1/4p.Canada, Northwest TerritoriesDiamond indicators

Abstract: The Central Mackenzie Valley (CMV) area of the Northwest Territories (NWT) comprises a Phanerozoic sedimentary basin that lies between the western margin of the Slave craton and the Cordillera. Although the region is considerably outside the bounds of the exposed Slave craton, both LITHOPROBE and more recent regional-scale surface wave studies (e.g., Priestley and McKenzie, 2006) indicate the likely presence of lithospheric mantle extending into the diamond stability field. Recent work conducted by Olivut Resources Ltd. led to the discovery of 29 kimberlites in the CMV. However, the indicator mineral chemistry of discovered kimberlites does not appear to be a good match (www.olivut.ca) with those during regional till and stream sediment sampling by the Geologic Survey of Canada (GSC) and Northwest Territories Geologic Survey (NTGS) in August 2003 and July 2005. We present new geochemical data on the regional indicator minerals with the aim of obtaining geotherm and depth of mantle sampling constraints on those indicator minerals discovered to date. A statistical evaluation of the data will compare the similarities to indicator mineral chemistry with parts of the Slave craton to evaluate whether the CMV indicators may ultimately be derived from that region. In total 3600 kimberlite indicator mineral grains were picked from the 0.25-2.0 mm size fractions. Peridotitic garnet grains dominate (46%), followed by magnesium ilmenite (26%), with decreasing individual proportions >15% of chromite, low-chrome diopside, olivine, chrome-diopside and eclogitic garnet. A sub-sample of these grains (3143) were analysed by EPMA. Garnet grains classify (after Grütter et al., 2004) as 1015 (62.1%) G9, 270 (16.5%) G11, 113 (6.9%) G10, 103 (6.3%) G12, 57 (3.5%) G1, 46 (2.8%) G10D, and the remaining 31 (1.9%) as G0, G3, G3D, G4, and G5. A sub-set of garnet grains (~700) were selected for LA-ICP-MS trace element analysis. Of the grains selected 74% G9, 14% G10 (and G10D), and 8% G11, with only 4% G12 and G0 (Grütter et al., 2004). Nickel concentrations from these grains range from 2.6-168.2 ppm, with the majority (>80%) between 20-100 ppm, yielding TNi (Canil, 1999) values ranging from 643-1348°C, with the majority between ~1000-1200°C. Using a central Slave craton geothermal gradient (Hasterok and Chapman, 2011), equilibration pressures for these garnet grains range from 20-80 kbars with the majority between 40-60 kbars (120-185 km). Preliminary analysis has 581 (81%) of the erupted peridotitic mantle garnet grains plotting within the diamond stability field (Kennedy and Kennedy, 1976). Of the 128 clinopyroxene grains analysed, only a few represent garnet peridotite (lherzolite) facies KIM clinopyroxene grains following compositional screening. Thermobarometry of these grains (Nimis and Taylor, 2000), assuming they were all derived from the same lithospheric section, yields P-T arrays identical to the central Slave geotherm that was 220 km thick at the time of eruption. These results are encouraging for diamond exploration. We thank Overburden Drilling Management Ltd. for grain picking and recovery of the small diamond, SGS Lakefield Research for mounting grains, and the GSC for probing of the grains.
DS201605-0884
2016
Poitras, S.Poitras, S.Indicator mineral chemistry of the Horn Plateau, NWT.DCO Edmonton Diamond Workshop, June 8-10Canada, Northwest TerritoriesGeochemistry - KIMS
DS201708-1737
2017
Poitras, S.Poitras, S.Evidence for a >200 km thick diamond -bearing root beneath the Central Mackenzie Valley, Northwest Territories, Canada: diamond indicator mineral geochemistry from the Horn Plateau and Trout Lakes regions.11th. International Kimberlite Conference, OralCanada, Northwest Territoriesindicator minerals
DS201709-1968
2017
Poitras, S.Bussweiler, Y., Poitras, S., Borovinskaya, O., Tanner, M., Pearson, G.Rapid multielemental analysis of garnet with LA-ICP-TOF-MS implications for diamond exploration studies.Goldschmidt Conference, abstract 1p.Canada, Northwest Territoriesdiamond potential

Abstract: Garnet arguably constitutes the most important mineral in diamond exploration studies; not only can the presence of mantle garnet in exploration samples point to kimberlite occurrences, but its minor and trace element composition can further be used to assess the “diamond potential” of a kimberlite. The content of Cr and Ca, especially, has been found to be a reliable tool to test whether garnets originate from within the diamond stability field in the mantle [1]. Trace element patterns can further indicate the mantle host rock of the garnets, for example, whether they originate from a depleted or ultra-depleted mantle section [2]. Routinely, two separate analytical methods are necessary to fully characterize the composition of garnet; major and minor elements are usually determined by electron probe micro-analysis (EPMA), whereas determination of trace elements requires the more sensitive method of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Here, we demonstrate rapid measurement of the entire suite of elements in garnet employing a new, commercially available timeof-flight (TOF) mass spectrometer, the icpTOF (TOFWERK AG, Thun, Switzerland), coupled to a fast wash-out laser ablation system (Teledyne Cetac Technologies Inc., Omaha, NE, USA). Using garnets from exploration samples taken from the Horn Plateau, Northwest Territories, Canada [3], we directly compare the icpTOF results to EPMA and LA-ICP-MS data. We examine whether the icpTOF can reliably characterize the garnets in Cr versus Ca space and at the same time reproduce their trace element patterns, thereby offering a cost effective method of analysis. The method of LA-ICP-TOF-MS, with its high speed of data acquisition and its ability to record the entire mass spectrum simultaneously, may have great benefits for (diamond) exploration studies. Moreover, the method can be used for fast, highresolution imaging, which is applicable to a wide range of geological materials and settings [4].
DS201902-0308
2018
Poitras, S.Poitras, S.Kimberlite indicator minerals from the Central Mackenzie Valley, Northwest Territories, Canada: a reconnaissance geochemical survey.University of Alberta, Msc thesis https://doi.org/ 10.7939/R3C53FH3P availableCanada, Northwest Territoriesmineral chemistry

Abstract: The Central Mackenzie Valley (CMV) area of Northwest Territories is underlain by Precambrian basement belonging to the North American Craton. The potential of this area to host kimberlitic diamond deposits is relatively high judging from the seismologically-defined lithospheric thickness, the age of basement rocks (2.2-1.7 Ga) and presence of kimberlite indicator minerals (KIMs) in Quaternary sediments. This study presents new major, minor and trace element chemistry data for kimberlite indicator mineral (KIM) grains collected from two regions within the Central Mackenzie Valley, Northwest Territories. The data, along with new kimberlite-related rutile U-Pb ages and ilmenite Hf isotopic compositions are used to constrain the composition and thickness of the lithospheric mantle sampled by the source kimberlite(s) and age of these kimberlites for these two regions. In the processed samples, peridotitic garnets dominate (> 25 % at each location) while eclogitic garnet is almost absent in both regions (< 1 % each). KIM chemistry for the Horn Plateau indicates significant diamond potential, with a strong similarity to KIM systematics from the Central and Western Slave Craton. The most significant issue to resolve in assessing the local diamond potential is the degree to which KIM chemistry reflects local and/or distal kimberlite bodies. Radiogenic isotope analysis of detrital kimberlite-related CMV oxide grains requires at least two broad age groups for eroded source kimberlites. Statistical analysis of the data suggests that it is probable that some of these KIMs were derived from primary and/or secondary sources within the CMV area, while others may have been transported to the area from the east-northeast by Pleistocene glacial and/or glaciofluvial systems. At this stage, KIM chemistry does not allow the exact location of the kimberlitic source(s) to be constrained.
DS201512-1958
2015
Poitras, S.P.Poitras, S.P.A geochemical study of diamond indicator minerals from the NWT interior platform.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 86.Canada, Northwest TerritoriesGeochemistry

Abstract: The Central Mackenzie Valley (CMV) area of the Northwest Territories (NWT) comprises a Phanerozoic sedimentary basin that lies between the western margin of the Slave craton and the Cordillera. Although the region is considerably outside the bounds of the exposed Slave craton, both LITHOPROBE and more recent regional-scale surface wave studies (e.g., Priestley and McKenzie, 2006) indicate the likely presence of lithospheric mantle extending into the diamond stability field. Recent work conducted by Olivut Resources Ltd. led to the discovery of 29 kimberlites in the CMV. However, the indicator mineral chemistry of discovered kimberlites does not appear to be a good match (www.olivut.ca) with those during regional till and stream sediment sampling by the Geologic Survey of Canada (GSC) and Northwest Territories Geologic Survey (NTGS) in August 2003 and July 2005. We present new geochemical data on the regional indicator minerals with the aim of obtaining geotherm and depth of mantle sampling constraints on those indicator minerals discovered to date. A statistical evaluation of the data will compare the similarities to indicator mineral chemistry with parts of the Slave craton to evaluate whether the CMV indicators may ultimately be derived from that region. In total 3600 kimberlite indicator mineral grains were picked from the 0.25-2.0 mm size fractions. Peridotitic garnet grains dominate (46%), followed by magnesium ilmenite (26%), with decreasing individual proportions >15% of chromite, low-chrome diopside, olivine, chrome-diopside and eclogitic garnet. A sub-sample of these grains (3143) were analysed by EPMA. Garnet grains classify (after Grütter et al., 2004) as 1015 (62.1%) G9, 270 (16.5%) G11, 113 (6.9%) G10, 103 (6.3%) G12, 57 (3.5%) G1, 46 (2.8%) G10D, and the remaining 31 (1.9%) as G0, G3, G3D, G4, and G5. A sub-set of garnet grains (~700) were selected for LA-ICP-MS trace element analysis. Of the grains selected 74% G9, 14% G10 (and G10D), and 8% G11, with only 4% G12 and G0 (Grütter et al., 2004). Nickel concentrations from these grains range from 2.6-168.2 ppm, with the majority (>80%) between 20-100 ppm, yielding TNi (Canil, 1999) values ranging from 643-1348°C, with the majority between ~1000-1200°C. Using a central Slave craton geothermal gradient (Hasterok and Chapman, 2011), equilibration pressures for these garnet grains range from 20-80 kbars with the majority between 40-60 kbars (120-185 km). Preliminary analysis has 581 (81%) of the erupted peridotitic mantle garnet grains plotting within the diamond stability field (Kennedy and Kennedy, 1976). Of the 128 clinopyroxene grains analysed, only a few represent garnet peridotite (lherzolite) facies KIM clinopyroxene grains following compositional screening. Thermobarometry of these grains (Nimis and Taylor, 2000), assuming they were all derived from the same lithospheric section, yields P-T arrays identical to the central Slave geotherm that was 220 km thick at the time of eruption. These results are encouraging for diamond exploration. We thank Overburden Drilling Management Ltd. for grain picking and recovery of the small diamond, SGS Lakefield Research for mounting grains, and the GSC for probing of the grains.
DS201812-2867
2018
Poitras, S.P.Poitras, S.P., Pearson, D.G., Hardman, M.F., Stachel, T., Nowell, G.M.Evidence for a 200 km thick diamond bearing root beneath the Central Mackenzie Valley, Northwest Territories, Canada? Diamond indicator mineral geochemistry from the Horn Plateau and Trout Lake regions.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0641-4 18p.Canada, Northwest Territoriesindicator minerals, geocthermobarometry

Abstract: The Central Mackenzie Valley (CMV) area of Northwest Territories is underlain by Precambrian basement belonging to the North American Craton. The potential of this area to host kimberlitic diamond deposits is relatively high judging from the seismologically-defined lithospheric thickness, age of basement rocks (2.2-1.7 Ga) and presence of kimberlite indicator minerals (KIMs) in Quaternary sediments. This study presents data for a large collection of KIMs recovered from stream sediments and till samples from two study areas in the CMV, the Horn Plateau and Trout Lake. In the processed samples, peridotitic garnets dominate the KIM grain count for both regions (> 25% each) while eclogitic garnet is almost absent in both regions (< 1% each). KIM chemistry for the Horn Plateau indicates significant diamond potential, with a strong similarity to KIM systematics from the Central and Western Slave Craton. The most significant issue to resolve in assessing the local diamond potential is the degree to which KIM chemistry reflects local and/or distal kimberlite bodies. Radiogenic isotope analysis of detrital kimberlite-related CMV ilmenite and rutile grains requires at least two broad age groups for eroded source kimberlites. Statistical analysis of the data suggests that it is probable that some of these KIMs were derived from primary and/or secondary sources within the CMV area, while others may have been transported to the area from the east-northeast by Pleistocene glacial and/or glaciofluvial systems. At this stage, KIM chemistry does not allow the exact location of the kimberlitic source(s) to be constrained.
DS200612-1097
2006
Poitrasson, F.Poitrasson, F.On the iron isotope homogeneity level of the continental crust.Chemical Geology, In press, availableMantleGeochemistry, igneous rocks
DS200712-0849
2007
Poitrasson, F.Poitrasson, F., Delpech, G., Grgeoire, M., Moine, B.N.Significance of the mantle Fe isotope variations.Plates, Plumes, and Paradigms, 1p. abstract p. A799.Africa, South AfricaXenoliths
DS200812-0255
2009
Poitrasson, F.Dalou, C., Koga, K.T., Hammouuda, T., Poitrasson, F.Trace element partitioning between carbonatitic melts and mantle transition zone minerals: implications for the source of carbonatites.Geochimica et Cosmochimica Acta, Vol. 73, 1, pp. 239-255.MantleCarbonatite
DS200912-0146
2009
Poitrasson, F.Dalou, C., Koga, K.T., Hammouda, T., Poitrasson, F.Trace element partitioning between carbonatitic melts and mantle transition zone minerals: implications for the source of carbonatites.Geochimica et Cosmochimica Acta, Vol. 73, 1, Jan. pp. 239-255.MantleCarbonatite
DS201312-0713
2013
Poitrasson, F.Poitrasson, F., Delpech, G., Gregoire, M.On the iron isotope heterogeneity of lithospheric mantle xenoliths: implications for mantle metasomatism, the origin of basalts and the iron isotope composition of the Earth.Contributions to Mineralogy and Petrology, Vol. 165, 6, pp. 1243-1258.Africa, Cameroon, South AfricaMelting
DS201012-0017
2010
Pokhienko, L.I.Ashchepkov, I., Pokhienko, N., Afansiev, V., Logvinova, A., Pokhienko, L.I., Ntaflos, Ionov, Kuligin, MityukhinMonomineral thermobarometry for the diamond inclusions from Siberia: genetic links.International Mineralogical Association meeting August Budapest, abstract p. 184.RussiaThermobarometry - Mir, Alakite
DS201012-0017
2010
Pokhienko, N.Ashchepkov, I., Pokhienko, N., Afansiev, V., Logvinova, A., Pokhienko, L.I., Ntaflos, Ionov, Kuligin, MityukhinMonomineral thermobarometry for the diamond inclusions from Siberia: genetic links.International Mineralogical Association meeting August Budapest, abstract p. 184.RussiaThermobarometry - Mir, Alakite
DS200412-0725
2004
PokhilenkGriffin, W.L., O'Reilly, S.Y., Doyle, B.J., Pearson, N.J., Coopersmith, H., Kivi, K., Melkovets, V., PokhilenkLithosphere mapping beneath the North American plate.Lithos, Vol. 77, 1-4, Sept. pp. 873-922.Canada, Northwest Territories, Europe, GreenlandArchon, Proton, Tecton, Slave Craton, Kapuskasing Struc
DS1995-1799
1995
PokhilenkoSobolev, V.N., Taylore, L.A., Snyder, G.A., PokhilenkoA unique metasomatised peridotite xenolith from the Mir kimberlite, Siberian PlatformProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 555-557.Russia, SiberiaXenolith -peridotite, Deposit -Mir
DS1998-0011
1998
PokhilenkoAgashev, A.M., Watanabe, T., Kuligin, S.S., PokhilenkoStrontium neodymium isotopes in the garnet pyroxenite xenoliths from Siberian kimberlites: a new insight into lithospheric..7th International Kimberlite Conference Abstract, pp. 11-13.Russia, SiberiaGarnet pyroxenite, mantle, Geochemistry
DS1998-1228
1998
PokhilenkoReimers, L.F., Pokhilenko, Yefimova, SobolevUltramafic mantle assemblages from Sytykanskaya kimberlite pipe, Yakutia7th. Kimberlite Conference abstract, pp. 730-32.Russia, YakutiaXenoliths, mineral chemistry, Deposit - Sytykanskaya
DS2000-0006
2000
PokhilenkoAfanasev, V.P., Pokhilenko, Loginova, Zinchuk, EfimovaProblem of false kimberlite indicators: a new morphogenetic type Cr spinellide Diamondiferous areas.Russian Geology and Geophysics, Vol.41,12,pp.1676-89., Vol.41,12,pp.1676-89.RussiaGeochemistry - indicators, Chrome spinellide
DS2000-0007
2000
PokhilenkoAfanasev, V.P., Pokhilenko, Loginova, Zinchuk, EfimovaProblem of false kimberlite indicators: a new morphogenetic type Cr spinellide Diamondiferous areas.Russian Geology and Geophysics, Vol.41,12,pp.1676-89., Vol.41,12,pp.1676-89.RussiaGeochemistry - indicators, Chrome spinellide
DS2000-0916
2000
PokhilenkoSonin, V.M., Federov, I.I., Pokhilenko, L., PokhilenkoDiamond oxidation rate as related to oxygen fugacityGeol. Ore Dep., Vol. 42, No. 6, pp. 496-503.RussiaDiamond - geochemistry
DS2001-0006
2001
PokhilenkoAgashev, A.M., Pokhilenko, McDonald, Takazawa, VavilovA unique kimberlite carbonatite primary association in the Snap lake dyke system: evidence from geochemical..Slave-Kaapvaal Workshop, Sept. Ottawa, 2p. abstractNorthwest TerritoriesGeochemistry, geochronology, Slave Craton, Deposit - Snap Lake
DS2001-0007
2001
PokhilenkoAgashev, A.M., Watanabe, Bydaev, Pokhilenko, FominGeochemistry of kimberlites from the Nakyn field, Siberia: evidence for unique source composition.Geology, Vol. 29, No. 3, Mar. pp. 267-70.Russia, SiberiaGeochronology, geochemistry
DS2001-0008
2001
PokhilenkoAgashev, A.M., Watanabe, T., Kuligin, S.S., PokhilenkoRubidium-Strontium and Samarium-neodymium isotopes in garnet pyroxenite xenoliths from Siberian kimberlites: an insight into lith. mantleJournal of Mineralogy and Petrology. Sciences, Vol. 96, No. 1, pp. 7-18.Russia, SiberiaGeochronology, Lithospheric - xenoliths
DS2003-0869
2003
PokhilenkoMalkovets, V.G., Taylor, L.A., Griffin, W., O'Reilly, S., Pearson, N., PokhilenkoCratonic considitons beneath Arkhangelsk, Russia: garnet peridotites form the Grib8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractRussia, Kola PeninsulaMantle geochemistry, Deposit - Grib
DS200612-0047
2006
PokhilenkoAshchepkov, I.V., Vladykin, Sobolev, Pokhilenko, Rotman, Logvinova, Afanasiev, Pokhilenko, KarpenkoReconstruction of the mantle sequences and the structure of the feeding and vein magmatic systems beneath the kimberlite fields of Siberian platform.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 79-103.Russia, SiberiaDyke systems
DS200612-0047
2006
PokhilenkoAshchepkov, I.V., Vladykin, Sobolev, Pokhilenko, Rotman, Logvinova, Afanasiev, Pokhilenko, KarpenkoReconstruction of the mantle sequences and the structure of the feeding and vein magmatic systems beneath the kimberlite fields of Siberian platform.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 79-103.Russia, SiberiaDyke systems
DS200612-0048
2006
PokhilenkoAshchepkov, I.V., Vladykin, Sobolev, Pokhilenko, Rotman, Logvinova, Afanasiev, Pokhilenko, KarpenkoVariations of the oxygen conditions in mantle column beneath Siberian kimberlite pipes and it's application to lithospheric structure of feeding systems.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 125-144.Russia, SiberiaRedox
DS200612-0048
2006
PokhilenkoAshchepkov, I.V., Vladykin, Sobolev, Pokhilenko, Rotman, Logvinova, Afanasiev, Pokhilenko, KarpenkoVariations of the oxygen conditions in mantle column beneath Siberian kimberlite pipes and it's application to lithospheric structure of feeding systems.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 125-144.Russia, SiberiaRedox
DS200812-0051
2008
PokhilenkoAshchepkov, I.V., Pokhilenko, Vladykin, Rotam, Afansiev, Logvinova, Kostrovitsky, Karpenko, KuliginReconstruction of mantle sections beneath Yakutian kimberlite pipes using monomineral thermobaraometry.Geological Society of London, Special Publication, SP 293, pp. 335-352.RussiaGeothermometry
DS200812-0053
2008
PokhilenkoAshchepkov, Pokhilenko, Vladykon, Loginova, Rotman, Afansiev, Kuligin, Malygina, Alymova, Stegnitsky, KhmetnikovaPlume interaction and evolution of the continental mantle lithosphere.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., 2008 pp. 104-121.MantlePlume
DS200912-0016
2009
PokhilenkoAschepokov, L., Logvinova, A., Kuligin, Pokhilenko, Vladykin, Mityukhin, Alymova, Malygina, VishnyakovaClinopyroxene eclogite peridotite thermobarometry of the large Yakutian kimberlite pipes.Goldschmidt Conference 2009, p. A58 Abstract.Russia, YakutiaThermobarometry
DS201012-0016
2010
PokhilenkoAshchepkov, I., Afanasiev, Vladykin, Pokhilenko, Ntaflos, Travin, Ionov, Palessky, Logvinova, Kuligin, MityukhinReasons of variations of the mineral compositions of the mantle rocks beneath the Yakutian kimberlite province.International Mineralogical Association meeting August Budapest, abstract p. 141.Russia, YakutiaGeothermometry
DS201012-0018
2010
PokhilenkoAshchepkov, I.V., Pokhilenko, Vladykin, Logvinova, Afansiev, Kuligin, Malygina, Alymova, KostrovitskyStructure and evolution of the lithospheric mantle beneath Siberian Craton, theromobarometric study.Tectonophysics, Vol. 485, pp. 17-41.RussiaGeothermometry
DS201012-0020
2009
PokhilenkoAshchepkov, Vladykin, Pokhilenko, Logvinova, Kuligin, Pokhilenko, Malgina, Alymova, Mityukhin, KopylovaApplication of the monomineral thermobarometers for the reconstruction of the mantle lithosphere structure.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., p. 98-116.MantleGeothermometry
DS201012-0020
2009
PokhilenkoAshchepkov, Vladykin, Pokhilenko, Logvinova, Kuligin, Pokhilenko, Malgina, Alymova, Mityukhin, KopylovaApplication of the monomineral thermobarometers for the reconstruction of the mantle lithosphere structure.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., p. 98-116.MantleGeothermometry
DS201012-0247
2010
PokhilenkoGrakhanov, S.A., Malanin, Yu.A., Pavlov, Afanasev, Pokhilenko, Gerasimchuk, LipashovaRhaetian diamond placers in Siberia.Russian Geology and Geophysics, Vol. 51, pp. 127-135.Russia, Yakutia, SakhaAlluvials
DS201112-0037
2010
PokhilenkoAshchepkov, Ntaflos, Vladykin, Ionov, Kuligin, Malygina, Pokhilenko, Logvinova, Mityukhin, Palessky, Khmelnikova, RotmasDeep seated xenoliths from the phlogopite bearing brown breccia of the Udachnaya pipe.Vladykin, N.V., Deep Seated Magmatism: its sources and plumes, pp. 164-186.RussiaMetasomatism
DS201112-0639
2011
PokhilenkoMalkovets, V.G., Griffin, Pearson, Rezvukhin, O'Reilly, Pokhilenko, Garanin, Spetsius, LitasovLate metasomatic addition of garnet to the SCLM: Os-isotope evidence.Goldschmidt Conference 2011, abstract p.1395.RussiaUdachnaya, Daldyn
DS201112-0640
2011
PokhilenkoMalkovets, V.G., Zedgenizov, Sobolev, Kuzmin, Gibsher, Shchukina, Golovin, Verichev, PokhilenkoContents of trace elements in olivines from diamonds and peridotite xenoliths of the V.Grib kimberlite pipe ( Arkhangel'sk Diamondiferous province, Russia).Doklady Earth Sciences, Vol. 436, 2, pp. 301-307.RussiaDeposit - Grib
DS2000-0916
2000
Pokhilenko, L.Sonin, V.M., Federov, I.I., Pokhilenko, L., PokhilenkoDiamond oxidation rate as related to oxygen fugacityGeol. Ore Dep., Vol. 42, No. 6, pp. 496-503.RussiaDiamond - geochemistry
DS201312-0839
2012
Pokhilenko, L.Smith, B., Baziotis, I., Carmody, L., Liu, Y., Taylor, L.A., Pokhilenko, N., Pokhilenko, L.The subcontinental lithospheric mantle of the NE Siberian craton: peridotites from Obnazhennaya.Geological Society of America Annual Meeting abstract, Paper 249-7, 1/2p. AbstractRussiaDeposit - Obnazhennaya
DS201412-0697
2014
Pokhilenko, L.Pokhilenko, L.Classification pecularities of mantle eclogites from Udachnaya-East pipe ( Yakutia).ima2014.co.za, AbstractRussia, YakutiaDeposit - Udachnaya-East
DS201909-2077
2019
Pokhilenko, L.Pokhilenko, N., Agashev, A., Pokhilenko, L.Features of metasomatic treatment of the lithosphere mantle depleted peridotites in relation with scale and diamond grade of kimberlite magmatism.Goldschmidt2019, 1p. Poster abstractSouth America, Brazildeposit - RosaRio-6

Abstract: Three main cycle of kimberlite magmatism are known for the Siberian Platform (SP) to date: Middle Paleozoic (D3), and two Mesozoic (T2-3 and J3). All economic highgrade kimberlites are of Middle Paleozoic (MP) age, and this feature is related with influence of melts/fluids of Permian-Triassic Siberian Super Plume produced huge changes in structure and composition of the SP Lithospheric Mantle (LM) including its enrichment by basaltic components, thinning, increase of fo2 and resorption of diamonds. Nevertheless, there are incredible differences in amounts of kimberlite bodies and their average diamond grade between different kimberlite fields of MP age, and these features are connected with intensity of carbonatite and silicate types of metasomatic treatment of the most deep-seated SP LM depleted peridotites especially of Lithosphere-Asthenosphere (LA) interaction zone. U-type lithospheric diamond formation is related with initial stage of carbonatite metasomatism, and its increase produce wehrlitezation and then carbonation of initial Cr-pyrope harzburgites and dunites but not related with diamond formation. Minor scale of silicate metasomatism of these modified LM peridotites produced conditions for generation of insignificant amount of kimberlite melts which form kimberlite fields with few bodies, but significant part of them are presented by high-grade kimberlite. And in case of significant scale of both carbonatite and silicate metasomatism of the LM peridotites produce large volume of kimberlite melt and hundreds of kimberlite bodies in fields with minor amonts of high grade ones.
DS1994-1393
1994
Pokhilenko, L.N.Pokhilenko, L.N., Federov, I.I., Pokhilenko, N.P., et al.Fluid regime of formation of mantle rocks according to dat a of chromatographic analysis and thermodynamic cal.Russian Geology and Geophysics, Vol. 35, No. 4, pp. 60-64.RussiaMantle, Kimberlites
DS2003-1089
2003
Pokhilenko, L.N.Pokhilenko, L.N., Tomilenko, A.A., Kuligin, S.S., Khlestov, V.V.The upper mantle heterogeneity: thermodynamic calculations and methods of8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, POSTER abstractRussia, YakutiaBlank
DS200412-1560
2003
Pokhilenko, L.N.Pokhilenko, L.N., Tomilenko, A.A., Kuligin, S.S., Khlestov, V.V.The upper mantle heterogeneity: thermodynamic calculations and methods of mathematical statistics.8 IKC Program, Session 6, POSTER abstractRussia, YakutiaMantle petrology
DS200412-1563
2003
Pokhilenko, L.N.Pokhilenko, N.P., Griffin, W.L., Shimizu, N., McLean, R.C., Malkovets, V.G., Pokhilenko, L.N., Malygina, E.V.Pyropes and chromites of the Snap Lake King Lake kimberlite dyke system in relation to the problem of the southern Slave Craton8 IKC Program, Session 6, POSTER abstractCanada, Northwest TerritoriesMantle petrology Deposit - Snap Lake King Lake
DS200812-0905
2008
Pokhilenko, L.N.Pokhilenko, L.N., Pokhilenko, N.P., Fedorov, L.I., Tomilenko, A.A., Usova, L.V., Fomina, L.N., Sobolev, V.S.Fluid regime pecularities of the lithosphere mantle of the Siberian Platform.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., 2008 pp. 122-136.Russia, SiberiaMantle chemistry
DS200912-0766
2009
Pokhilenko, L.N.Tomilenko, A.A., Kovyazin, S.V., Pokhilenko, L.N., Sobolev, N.V.Primary hydrocarbon inclusions in garnet of Diamondiferous eclogite from the Udachnaya kimberlite pipe, Yakutia.Doklady Earth Sciences, Vol. 427, 4, pp. 695-8.Russia, YakutiaDeposit - Udachnaya
DS201112-0806
2011
Pokhilenko, L.N.Pokhilenko, L.N., Aliforova, T.A.Plagioclase and apatite from exsolution structures in minerals from mantle xenoliths.Doklady Earth Sciences, Vol. 437, 2, pp. 483-485.MantleMineralogy
DS201112-0807
2010
Pokhilenko, L.N.Pokhilenko, L.N., Pokhilenko, N.P., Vladykin, N.V.Garnet orthopyroxenites from the Udachnaya kimberlite pipe ( Yakutia): features of their composition and orogin.Vladykin, N.V., Deep Seated Magmatism: its sources and plumes, pp. 128-144.Russia, YakutiaMineralogy - genesis
DS201112-1050
2011
Pokhilenko, L.N.Tomilenko, A.A., Kovyazin, S.V., Pokhilenko, L.N., Sobolev, N.V.Silicate globules in kyanite from grospydites of the Zagadochnaya kimberlite pipe, Yakutia: the problem of origin.Doklady Earth Sciences, Vol. 436, 1, pp. 98-101.Russia, YakutiaPetrology
DS201212-0009
2012
Pokhilenko, L.N.Alifirova, T.A., Pokhilenko, L.N., Ovchinnikov, Y.I., Riches, A.J.V., Taylor, L.A.Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites.International Geology Review, in press availableRussia, YakutiaPetrology
DS201212-0010
2012
Pokhilenko, L.N.Alifirova, T.A., Pokhilenko, L.N., Malkovets, V.G., Griffin, W.L.Petrological inferences for the role of exsolution in upper mantle: evidence from the Yakutian kimberlite xenoliths.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractRussia, YakutiaPetrology
DS201212-0011
2012
Pokhilenko, L.N.Aliforova, T.A., Pokhilenko, L.N., Ovchinnikov, Y.I., Donnelly, C.L., Riches, A.J.V., Taylor, L.A.Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenite xenoliths from Yakutia kimberlites.International Geology Review, Vol. 54, 9, pp. 1071-1092.RussiaDeposit - Yakutia
DS201212-0037
2012
Pokhilenko, L.N.Ashchepkov, IV., Nntalfos, T., Pokhilenko, L.N., Ionov, D.A., Vladykin, N.V., Kuligin, S.S., Mityukhin, S.I., Palessky, S.V.Mantle structure beneath Udachnaya pipe reconstructed by fresh mantle xenoliths from brown breccia.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaDeposit - Udachnaya
DS201212-0257
2012
Pokhilenko, L.N.Goncharov, A.G., Ionov, D.A., Doucet, L.S., Pokhilenko, L.N.Thermal stress, oxygen fugacity and C O H fluid appreciation in cratonic lithospheric mantle: new dat a on peridotite xenoliths from the Udachnaya kimberlite, Siberia.Earth and Planetary Science Letters, Vol. 357-358, pp. 99-110.RussiaDeposit - Udachnaya
DS201212-0559
2012
Pokhilenko, L.N.Pokhilenko, L.N., Alifirova, T.A., Yudin, D.S.40Ar/39Ar dating of phlogopite of mantle xenoliths from kimberlite pipes of Yakutia: evidence for deep ancient metasomatism of the Siberian platform.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractRussia, YakutiaGeochronology
DS201212-0560
2012
Pokhilenko, L.N.Pokhilenko, L.N., Aliflrova, T.A., Yudin, D.S.40Ar/39Ar dating of phlogopite of mantle xenoliths from kimberlite pipes of Yakutia: evidence for deep ancient metasomatism of the Siberian platform.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, SiberiaGeochronology
DS201212-0562
2012
Pokhilenko, L.N.Pokhilenko, N.P., Afanasev, V.P., McDonald, J.A., Vavilov, M.A., Kulgin, S.S., Pokhilenko, L.N., Golovin, A.V., Agashev, A.M.Kimberlite indicator minerals in terrigene sediments of lower part of Mackenzie River Basin, NWT, Canada: evidence of new craton with thick lithosphere.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, Northwest TerritoriesGeochemistry - KIMS
DS201312-0014
2013
Pokhilenko, L.N.Alifirova, T.A., Pokhilenko, L.N.Apatite exsolution as an indicator of Udachnaya grospydite UHP history.Goldschmidt 2013, AbstractRussiaUHP
DS201312-0401
2014
Pokhilenko, L.N.Howarth, G.H., Barry, P.H., Pernet-Fisher, J.F., Baziotis, I.P., Pokhilenko, N.P., Pokhilenko, L.N., Bodnar, R.J., Taylor, L.A.Superplume metasomatism: evidence from Siberian mantle xenoliths.Lithos, Vol. 184-187, pp. 209-224.Russia, SiberiaMetasomatism
DS201412-0698
2014
Pokhilenko, L.N.Pokhilenko, L.N., Malkovets, V.G., Kuzmin, D.V., Pokhilenko, N.P.New dat a on the mineralogy of megacrystalline pyrope peridotite from the Udachnaya kimberlite pipe, Siberian Craton, Yakutian Diamondiferous province.Doklady Earth Sciences, Vol. 454. no. 2, pp. 179-184.Russia, YakutiaDeposit - Udachnaya
DS201502-0091
2015
Pokhilenko, L.N.Poikilenko, N.P., Agashev, A.M., Litasov, K.D., Pokhilenko, L.N.Carbonatite metasomatism of peridotite lithospheric mantle: implications for diamond formation and carbonatite-kimberlite magmatism.Russian Geology and Geophysics, Vol. 56, 1, pp. 280-295.MantleCarbonatite
DS201503-0131
2015
Pokhilenko, L.N.Alifirova, T.A., Pokhilenko, L.N., Korsakov, A.V.Apatite, SiO2, rutile and orthopyroxene precipitates in minerals of eclogite xenoliths from Yakutian kimberlites, Russia.Lithos, Vol. 226, pp. 31-49.Russia, YakutiaDeposit - Udachnaya, Zarnitsa, Obnazhennaya

Abstract: Eclogite mantle xenoliths from the central part of Siberian craton (Udachnaya and Zarnitsa kimberlite pipes) as well as from the northeastern edge of the craton (Obnazhennaya kimberlite) were studied in detail. Garnet and clinopyroxene show evident exsolution textures. Garnet comprises rutile, ilmenite, apatite, and quartz/coesite oriented inclusions. Clinopyroxene contains rutile (± ilmenite) and apatite precipitates. Granular inclusions of quartz in kyanite and garnet usually retain features of their high-pressure origin. According to thermobarometric calculations, studied eclogitic suite was equilibrated within lithospheric mantle at 3.2–4.9 GPa and 813–1080 °C. The precursor composition of garnets from Udachnaya and Zarnitsa eclogites suggests their stability at depths 210–260 km. Apatite precipitation in clinopyroxenes of Udachnaya and Zarnitsa allows us to declare that original pyroxenes could have been indicative of their high P–T stability. Raman spectroscopic study of quartz and coesite precipitates in garnet porphyroblasts confirms our hypothesis on the origin of the exsolution textures during pressure-temperature decrease. With respect to mineralogical data, we suppose the rocks to be subjected to stepwise decompression and cooling within mantle reservoir.
DS201504-0202
2015
Pokhilenko, L.N.Howarth, G.H., Sobolev, N.V., Pernet-Fisher, J.F., Ketcham, R.A., Maisano, J.A., Pokhilenko, L.N., Taylor, D.3-D X-ray tomography of Diamondiferous mantle eclogite xenoliths, Siberia: a review.Journal of Asian Earth Sciences, Vol. 101, 1, pp. 39-67.RussiaDeposit - Udachnaya
DS201709-1950
2017
Pokhilenko, L.N.Alifirova, T.A., Pokhilenko, L.N., Taylor, L.A.Evolution of garnet clinopyroxenites from a margin of Siberian craton in major and rare element viewpoint.Goldschmidt Conference, abstract 1p.Russia, Siberiadeposit - Obnazhennaya

Abstract: Clinopyroxenite mantle xenoliths from Obnazhënnaya kimberlite pipe, NE part of Siberian craton (Russia), preserve porphyroclastic clinopyroxene with no less than two generations of garnet and orthopyroxene lamellae, sometimes together with rutile. Their crystallographic relationships are consistent with an origin by solid-state exsolution. According to reintegrated major-element chemistry and datasets for natural systems the homogeneous high-Al clinopyroxenes were previously in equilibrium within a T range of ~1400– 1500 ºC at a minimum P of 2 GPa. Ca and Al variations in a clinopyroxene assume exsolution to take place during a cooling accompanied by a compression. According to Al contents the growth of orthopyroxene lamellae in the rocks is continued down to ~850 ºC and 2.7 GPa. The xenoliths matrix assemblage of Cpx+Grt±Opx marks strain-induced recrystallization where the exsolution features in recrystallized minerals are absent. Later re-equilibration of the mineral assemblage occurred at 790–810 ºC and 3.0–3.2 GPa in the cratonic mantle prior to the removal of rocks by kimberlite melts; the reactions were controlled by the diffusion of Ca and Al in a pyroxene structure. It was noted that Sr in clinopyroxenes (284–556 ppm) increases from core to rim together with V (149–226 ppm) and Ca, opposite to Al content higher in the center of Cpx porphyroclasts. A positive Eu anomaly is significant both in clinopyroxenes and garnets (Eu/Eu* = 1.5–1.8 and 1.3–2.0, respectively). Substitution of Al for Si in the pyroxene tetrahedral sites has allowed charging balance for the substitution of additional trivalent REE into the pyroxene M2 site [1]. The process has affected to the Sr2+, Sm3+ and V3+ contents and Eu2+/Eu3+ relations responsible for the presence of Eu anomaly in a pyroxene. The work was supported by the grant of the President of the Russian Federation MK-2231.2017.5. The study with LAT was funded by NSF grant EAR-1144337.
DS201709-2000
2017
Pokhilenko, L.N.Ilyina, O.V., Pokhilenko, L.N., Agashev, A.M.Characteristics of platinum group elements ( PGE) distribution in mantle xenoliths from kimberlite Udachnaya pipe ( Yakutia).Goldschmidt Conference, abstract 1p.Russia, Yakutiadeposit - Udachnaya

Abstract: We report PGE data in xenoliths of the deformed and granular peridotites. The deformed peridotites are the most deep-seated rocks and represent a narrow range of depth (180-220 km) while granular peridotites are located throughout the section of the lithospheric mantle. PGE distribution in the deformed peridotites [1] generally corresponds to that in our granular peridotites and xenoliths from Lesotho [2]. But in contrast with broad range of PGE concentrations in granular peridotites, the deformed peridotites show nearly flat pattern from Os to Pt, except of Pd (Fig.1). Granular peridotites show good positive correlation between PGE and Fe2O3. We suppose that they enriched in PGE by iron phase during its evolution. As for deformed peridotites we propose that they were depleted in Ir and Os followed by the increase of Ga and Cpx on the first stage of mantle metasomatism. On the last stage the enrichment of Pt, Pd and Re was probably a result of submicron sulphide phase’s presipitation in the interstices of mantle rocks.
DS201709-2044
2017
Pokhilenko, L.N.Pokhilenko, L.N.Exotic olivine glimmerites of Yakutia - the related polymict breccias.Goldschmidt Conference, abstract 1p.Russiaglimmerite

Abstract: The rocks, which are totally comprised of olivine and mica, have been found among the xenoliths of the Udachnaya-East pipe (Yakutia). The essential amount (first percents) of ilmenite of different morphology has been found in two rocks. These exotic olivine glimmerites appeared to be similar to the polymict breccia in the wide variations of olivine (LUV709/11 and LUV659/11 - Mg#(%): 86-93 and 83-91, respectively), phlogopite ((wt.%), LUV659/11: SiO2 38.5-40.6, TiO2 2.5-6, Al2O3 11.3-14, Cr2O3 0.4-1, MgO 19.8-23.1, FeO 6.1-7.9, Na2O 0.5-1.3, K2O 8.6-9.9), ilmenite (LUV709/11: Mg#(%) 23.6-47.8; Cr2O3 (wt.%): 0.63-1.01) compositions and also in the abundance of accessory minerals (chromite, rutile, sulphides, calcite, dolomite, siderite, barite). The compositions of rock-forming minerals of the glimmerites do not fall within the compositional fields of similar minerals from the peridotites of kimberlite xenoliths but strongly overlap with that from the polymict breccias. Moreover, the compositions of phlogopite from the glimmerites have demonstrated similar in Al, Fe and Ti composition kimberlite trend typical of phlogopites from the polymict breccia of the South Africa. Unusual olivine glimmerites LUV659/11 and LUV709/11 were probably formed from the ancient protokimberlite melts like polymict breccias. Initially they have been strongly depleted and hence olivine is the main rock-forming mineral. Therefore, two main stages of metasomatic retreatment before the capture by kimberlite can be recognized. One is related with Ti and Fe introduction (ilmenite formation), another, more strong, with abundant introduction of Al and alkalis (mainly K) with a consequent formation of abundant phlogopite. These stages probably had several phases as evidenced by the compositional variations of the formed minerals.
DS201807-1477
2018
Pokhilenko, L.N.Agashev, A.M., Pokhilenko, L.N., Pokhilenko, N.P., Shchukina, E.V.Geochemistry of eclogite xenoliths from the Udachnaya kimberlite pipe: section of ancient oceanic crust sampled.Lithos, DOI:10.1016 /j.lithos.2018 .05.027 available 52p.Russiadeposit - Udachnaya

Abstract: A suite of seventeen unique, large, and fresh eclogite xenoliths from the Udachnaya pipe have been studied for their whole-rock and mineral major- and trace-element compositions. Based on their major-element compositions, the Udachnaya eclogites can be subdivided in two groups: high magnesian (Mg# 68.8-81.9) and low magnesian (Mg# 56.8-59). The two eclogite groups are clearly different in the style of correlation between major elements. Positive correlations of FeO and CaO with MgO are observed in the low-magnesian group, whereas these correlations are negative in the high-magnesian group. In terms of trace element composition, the Udachnaya eclogites are enriched over Primitive Mantle, but comparable to mid-ocean-ridge basalt composition, except for significant enrichment in large-ion lithophile elements (LILE; Rb, Ba, K, Sr). Most of the samples show a positive Eu anomaly, irrespective of group. Reconstructed whole-rock composition from clinopyroxene and garnet modal abundances contains much less incompatible elements (LILE, light rare earth elements, high field strength elements) than measured composition. Approximately 60 to 100% of the middle rare earth elements, Zr, and Hf, and nearly 100% of the heavy rare earth elements, Co, V, and Sc of the whole-rock budget are concentrated in Gar and Cpx. Variations in major element compositions cover a full section of the modern and Archaean oceanic crust, from troctolite, through gabbroic rocks, to basalts. The low-Mg# eclogites could have formed from upper oceanic crust protoliths, being a mixture of basalts and gabbro, whereas the high-Mg# eclogites are originated from gabbro-troctolite section of the lower oceanic crust. Concordant variations of Eu anomaly with the Lu/Sr ratio and the V and Ni contents in the eclogite compositions are in agreement with the fractionation of plagioclase, clinopyroxene, and olivine in their low-pressure precursor rocks. Negative correlations of SiO2 and MgO, and a low Nd/YbNMORB ratio, in the low-Mg# eclogites are in agreement with partial melt loss, but the presence of accessory quartz limits the degree of melting to 13%. Major and trace element compositions suggest that the high-Mg# eclogites, and, consequently, the lower oceanic crust, could not have experienced significant melt loss, and subduction in the Archaean may have been essentially dry, compared to the present day.
DS201810-2369
2018
Pokhilenko, L.N.Pokhilenko, L.N.Exotic olivine mica rocks from the Udachnaya -East pipe ( Yakutia): features of the chemical composition and origin.Doklady Earth Sciences, Vol. 481, 2, pp. 1050-1055.Russia, Yakutiadeposit - Udachnaya -East
DS201909-2074
2019
Pokhilenko, L.N.Pernet-Fisher, J.F., Barry, P.H., Day, J.M.D., Pearson, D.G., Woodland, S., Agashev, A.M., Pokhilenko, L.N., Pokhilenko, N.P.Heterogeneous kimberlite metasomatism revealed from a combined He-Os isotope study of Siberian megacrustalline dunite xenoliths.Geochimica et Cosmochimica Acta, in press available 45p. PdfRussia, Siberiadeposit - Udachnaya East
DS1994-1654
1994
Pokhilenko, N.Sobolev, N.V., Afanasyev, V.P., Pokhilenko, N., Kaminsky, F.Pyropes and diamonds from the Algerian SaharaDoklady Academy of Sciences USSR, Vol. 326, Oct. pp. 151-157.AlgeriaAlluvials, Geochemistry -garnets
DS1997-0890
1997
Pokhilenko, N.Patchen, A.D., Taylor, L.A., Pokhilenko, N.Ferrous freudenbergite in ilmenite megacrysts: a unique paragenesis From the Dalnaya kimberlite, Yakutia.American Mineralogist, Vol. 82, No. 9-10, Sept-Oct. pp. 991-1000.Russia, YakutiaMineralogy, Deposit - Dalnaya
DS1998-0010
1998
Pokhilenko, N.Agashev, A.M., Fomin, A.S., Watanabe, T., Pokhilenko, N.Preliminary age determination of recently discovered kimberlites of the Siberian kimberlite province.7th International Kimberlite Conference Abstract, pp. 9-10.Russia, SiberiaGeochronology, Deposit - Sredne-Marxz, Botuobinskaya, Nurbinskaya
DS1998-0977
1998
Pokhilenko, N.McDonald, J.A., Pokhilenko, N., Melnyk, W., Hall, A.Camsell Lake kimberlites, Slave Province, northwest TerritoriesGeological Society of America (GSA) Annual Meeting, abstract. only, p.A245.Northwest TerritoriesExploration - history outline, Deposit - Camsell Lake, Snap Lake, dike
DS2002-1032
2002
Pokhilenko, N.McDonald, J.A., Pokhilenko, N., Melnyk, W., Hall, A.Camsell Lake kimberlites, Slave Province, Northwest TerritoriesCanadian Institute of Mining and Metallurgy, Vol. 53, Industrial Minerals of Canada, pp. 361-2.Northwest TerritoriesHistory - exploration
DS201312-0006
2013
Pokhilenko, N.Afanasiev, V., Agashev, A., Pokhilenko, N.Dispersion haloes of kimberlite indicator minerals in the Siberian Platform: history and formation conditions.Geology of Ore Deposits, Vol. 55, 4, pp. 256-264.RussiaMineral chemistry
DS201312-0839
2012
Pokhilenko, N.Smith, B., Baziotis, I., Carmody, L., Liu, Y., Taylor, L.A., Pokhilenko, N., Pokhilenko, L.The subcontinental lithospheric mantle of the NE Siberian craton: peridotites from Obnazhennaya.Geological Society of America Annual Meeting abstract, Paper 249-7, 1/2p. AbstractRussiaDeposit - Obnazhennaya
DS201312-0995
2013
Pokhilenko, N.Yelisseyev, A., Meng, G.S., Afanasyev, V., Pokhilenko, N., Pustovarov, V., Isakova, A., Lin, Z.S, Lin, H.Q.Optical properties of impact diamonds from the Popigai astroblemes.Diamond and Related Materials, Vol. 37, pp. 8-16.Russia, SiberiaMeteortic diamonds
DS201412-0699
2014
Pokhilenko, N.Pokhilenko, N.Kimberlite indicator minerals in terrigine sediments of Arctic regions of Siberian and North American ancient platforms: evidence of new cratons with thick lithosphere.ima2014.co.za, PosterRussia, CanadaGeochemistry
DS201412-0700
2014
Pokhilenko, N.Pokhilenko, N.Peridotites of the diamond stability field of the ancient craton lithospheric mantle: relationship with evolution of lithosphere roots and kimberlite melts generation.ima2014.co.za, AbstractMantleMelting
DS201412-0795
2014
Pokhilenko, N.Sharygin, I., Litasov, K., Shatskiy, A., Golovin, A., Ohtani, E., Pokhilenko, N.Is kimberlite magma ascent fuelled by CO2 degassing via orthopyroxene assimilation?V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractTechnologyModel
DS201412-0796
2014
Pokhilenko, N.Sharygin, I., Litasov, K., Shatskiy, A., Golovin, A., Ohtani, E., Pokhilenko, N.Melting phase relations of the Udachnaya East Group 1 kimberlite at 3.0-6.5 GPA: experimental evidence for alkali-carbonatite composition of primary kimberlite melt.V.S. Sobolev Institute of Geology and Mineralogy Siberian Branch Russian Academy of Sciences International Symposium Advances in high pressure research: breaking scales and horizons ( Courtesy of N. Poikilenko), Held Sept. 22-26, 2p. AbstractRussia, YakutiaDeposit - Udachnaya-East
DS201502-0100
2015
Pokhilenko, N.Shchukina, E., Agashev, A., Pokhilenko, N.Multistage metasomatism in lithospheric mantle beneath V. Grib pipe ( Arkhangelsk Diamondiferous province, Russia): evidence from REE patterns in garnet xenocrysts.Economic Geology Research Institute 2015, Vol. 17,, # 1940, 1p. AbstractRussia, Kola Peninsula, ArchangelDeposit - Grib
DS201509-0439
2015
Pokhilenko, N.Yelisseyev, A., Khrenov, A., Afanasiev, V., Pustovarov, V., Gromilov, S., Panchenko, A., Pokhilenko, N., Litasov, K.Luminescence of natural carbon nanomaterial: impact diamonds from the Popigai crater.Diamond and Related Materials, Vol. 58, pp. 69-77.RussiaDeposit - Popigai

Abstract: Impact diamonds (IDs) from the Popigai crater are aggregates of nanoparticulate graphite and cubic and hexagonal diamonds. IDs demonstrate broad-band emissions at 3.05, 2.8, 2.3 and 2.0 eV, which are associated with structural defects and are similar to those in detonation ultra-dispersed diamonds and CVD diamond films. A doublet with components at 1.7856 and 1.7892 eV in some ID samples is related to R1,2 lines of Cr3 + ions in corundum inclusions. The presence of N3, H3, NV0 and NV- vibronic systems in some of the ID samples shows that (i) there is nitrogen impurity and (ii) samples underwent high temperature annealing that promoted vacancies and nitrogen diffusion and defect aggregation. The luminescence decay fits with a sum of two exponential components: lifetime of the fast one is in the 5 to 9 ns range. Parameters of the traps responsible for broad thermoluminescence peaks at 148, 180, 276 and 383 K were estimated.
DS201909-2077
2019
Pokhilenko, N.Pokhilenko, N., Agashev, A., Pokhilenko, L.Features of metasomatic treatment of the lithosphere mantle depleted peridotites in relation with scale and diamond grade of kimberlite magmatism.Goldschmidt2019, 1p. Poster abstractSouth America, Brazildeposit - RosaRio-6

Abstract: Three main cycle of kimberlite magmatism are known for the Siberian Platform (SP) to date: Middle Paleozoic (D3), and two Mesozoic (T2-3 and J3). All economic highgrade kimberlites are of Middle Paleozoic (MP) age, and this feature is related with influence of melts/fluids of Permian-Triassic Siberian Super Plume produced huge changes in structure and composition of the SP Lithospheric Mantle (LM) including its enrichment by basaltic components, thinning, increase of fo2 and resorption of diamonds. Nevertheless, there are incredible differences in amounts of kimberlite bodies and their average diamond grade between different kimberlite fields of MP age, and these features are connected with intensity of carbonatite and silicate types of metasomatic treatment of the most deep-seated SP LM depleted peridotites especially of Lithosphere-Asthenosphere (LA) interaction zone. U-type lithospheric diamond formation is related with initial stage of carbonatite metasomatism, and its increase produce wehrlitezation and then carbonation of initial Cr-pyrope harzburgites and dunites but not related with diamond formation. Minor scale of silicate metasomatism of these modified LM peridotites produced conditions for generation of insignificant amount of kimberlite melts which form kimberlite fields with few bodies, but significant part of them are presented by high-grade kimberlite. And in case of significant scale of both carbonatite and silicate metasomatism of the LM peridotites produce large volume of kimberlite melt and hundreds of kimberlite bodies in fields with minor amonts of high grade ones.
DS1982-0500
1982
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V., Efimova, E.S.Xenolith of Cataclazed Diamond Bearing Disthenic Eclogite from the Pipe 'udachnaia' Yakutia.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 266, No. 1, PP. 212-216.RussiaBlank
DS1983-0010
1983
Pokhilenko, N.P.Amshinskii, A.N., Pokhilenko, N.P.Some Distinctive Features of the Composition of Picrolimenites from the Zarnitsa Kimerlite Pipe (yakutia).Soviet Geology and GEOPHYSICS, Vol. 24, No. 11, PP. 106-110.RussiaMineralogy
DS1983-0354
1983
Pokhilenko, N.P.Kharkiv, A.D., Pokhilenko, N.P., Sobolev, N.V.Large Xenoliths of Cataclased Lherzolites from the Udachnaya Kimberlite Pipe of Yakutia.Soviet Geology And Geophysics, Vol. 24, No. 1, PP. 67-72.RussiaMineralogy
DS1984-0591
1984
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V., Yefimova, YE.S.Xenolith of Broken Down Diamond Bearing Kyanite Eclogite From the Udachnaya Pipe, Yakutia.Doklady Academy of Science USSR, Earth Science Section., Vol. 266, No. 1-6, MAY PP. 90-94.Russia, YakutiaLherzolite, Geothermometry, Genesis, Diamond Morphology
DS1984-0613
1984
Pokhilenko, N.P.Rodionov, A.S., Pokhilenko, N.P., Sobolev, N.V.Comparative Description of Major Minerals of the Concentrate of the Two Varieties of Kimberlite of the Dalnyi Pipe of Yakutia.Soviet Geology And Geophysics, Vol. 25, No. 5, PP. 33-44.Russia, YakutiaMineralogy
DS1984-0693
1984
Pokhilenko, N.P.Sobolev, N.V., Pokhilenko, N.P., Efimova, E.S.Diamond Bearing Peridotite Xenoliths in Kimberlites and The problem of the Origin of Diamonds.Soviet Geology And Geophysics, Vol. 25, No. 12, PP. 62-76.RussiaGenesis
DS1984-0694
1984
Pokhilenko, N.P.Sobolev, N.V., Pokhilenko, N.P., Efimova, E.S.Xenoliths of Diamond Bearing Peridotites in Kimberlites And the Problem of Diamonds Origin.Geologii i Geofiziki, No. 12, (300) DECEMBER PP. 63-RussiaGenesis, Petrography
DS1986-0647
1986
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V.Xenoliths of Diamondiferous peridotites from Udachnaya kimberlite pipe, YakutiaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 309-310RussiaBlank
DS1986-0766
1986
Pokhilenko, N.P.Sobolev, N.V., Kharkiv, A.D., Pokhilenko, N.P.Kimberlites, lamproites and the composition of the upper mantleSoviet Geology and Geophysics, Vol. 27, No. 7, pp. 10-18RussiaKimberlite, Lamproite
DS1986-0767
1986
Pokhilenko, N.P.Sobolev, N.V., Pokhilenko, N.P., Carswell, D.A., Rodionov, A.S.Sheared lherzolites from kimberlites of YakutiaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 338-339RussiaBlank
DS1988-0582
1988
Pokhilenko, N.P.Rodionov, A.S., Amshinskiy, A.N., Pokhilenko, N.P.Ilmenite-pyrope wehrlites: a new type of paragenesis in xenoliths fromkimberliteSoviet Geology and Geophysics, Vol. 29, No. 7, pp. 48-51RussiaXenoliths, Wehrlites
DS1989-0696
1989
Pokhilenko, N.P.Jagoutz, E., Shatsky, V.S., Sobolev, N.V., Pokhilenko, N.P.lead-neodymium-Sr isotope study of the Kokchetav Massif;the outcrop of the lowerlithosphereDiamond Workshop, International Geological Congress, July 15-16th. editors, pp. 32-35. AbstractRussiaMantle, Geochronology
DS1989-0739
1989
Pokhilenko, N.P.Kadik, A.A., Sobolev, N.V., Zharkova, E.V., Pokhilenko, N.P.Redox conditions of formation of diamond bearing peridotite xenoliths from Udachnaya kimberlite pipe,Yakutia.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 8, August pp. 1120-1135RussiaGeochemistry, Xenoliths - peridotite
DS1989-1426
1989
Pokhilenko, N.P.Sobolev, N.V., Sobolev, A.V., Pokhilenko, N.P., Yefimova, E.S.Chrome spinels coexisting with Yakutian diamondsDiamond Workshop, International Geological Congress, July 15-16th. editors, pp. 105-108. AbstractRussiaMineral chemistry, Chrome spinels
DS1990-0793
1990
Pokhilenko, N.P.Kadik, A.A., Sobolev, N.V., Zharkova, Ye.V., Pokhilenko, N.P.Redox conditions of formation of diamond bearing peridotite xenoliths In the Udachnaya kimberlite pipe, YakutiaGeochemistry Int, Vol. 27, No. 4, pp. 41-54RussiaRedox Udachnaya, Peridotite
DS1990-1191
1990
Pokhilenko, N.P.Pokhilenko, N.P.Clinopyroxenes and their composition products in xenoliths of mantle Rocks in kimberlites of YakutiaInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 2, extended abstract p. 819-821RussiaClinopyroxenes, Kimberlites
DS1991-0003
1991
Pokhilenko, N.P.Afanasev, V.P., Sobolev, N.V., Pokhilenko, N.P.Exogenous changes of the indicator minerals at the formation of mineralogical halos of kimberlite bodiesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 1-2RussiaAlluvial, Diamonds -mineralogy
DS1991-1360
1991
Pokhilenko, N.P.Pokhilenko, N.P., Pearson, D.G., Boyd, F.R., Sobolev, N.V.Megacrystalline dunites and peridotites: hosts for Siberian diamondsCarnegie Institute Annual Report of the Director Geophysical Laboratory, No. 2250, pp. 11-18Russia, SiberiaDunites, Peridotites
DS1991-1446
1991
Pokhilenko, N.P.Rodionov, A.S., Sobolev, N.V., Pokhilenko, N.P., Suddaby, P.Ilmenite-bearing peridotites and megacrysts from Dalnaya kimberlite pipe, YakutiaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 339-341RussiaMineral chemistry, ilmenite-pyrope lherzolite, Ilmenite-pyrope wehrlites, Metasomatism
DS1991-1623
1991
Pokhilenko, N.P.Sobolev, N.V., Bakumenko, I.T., Yefimova, E.S., Pokhilenko, N.P.Morphological features of microdiamonds, sodium in garnet and potassium inpyroxenes content of two eclogite xenoliths from Udachnaya pipe(Yakutia).(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 321, No. 3, pp. 585-592Russia, Commonwealth of Independent States (CIS), YakutiaMicrodiamonds, Udachanya pipe
DS1991-1624
1991
Pokhilenko, N.P.Sobolev, N.V., Bakumenko, I.T., Yefimova, E.S., Pokhilenko, N.P.Pecularities of microdiamond morphology, sodium content in garnets andDoklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 321, No. 3, pp. 585-592. #hh968RussiaMicro-diamonds, Geochemistry
DS1992-1446
1992
Pokhilenko, N.P.Sobolev, N.V., Afanasev, V.P., Pokhilenko, N.P., Kaminsky, F.V.Pyropes and diamonds of the Algerian Sahara.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 325, No. 2, pp. 367-373.AlgeriaIndicator minerals, Pyropes, diamonds
DS1992-1449
1992
Pokhilenko, N.P.Sobolev, N.V., Pokhilenko, N.P., Grib, V.P., Skripnichenko, V.A.Specific composition and conditions of formation of deep seated mineralsRussian Geology and Geophysics, Vol. 33, No. 10, pp. 71-78.Russia, Commonwealth of Independent States (CIS), Arkangelsk, RussiaZolotisa Field, Tectonics, Explosion pipes, Kimberlites
DS1993-0151
1993
Pokhilenko, N.P.Boyd, F.R., Pearson, D.G., Pokhilenko, N.P., Mertzman, S.A.Cratonic mantle composition: evidence from Siberian xenolithsEos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 321Russia, SiberiaBulk composition, Mineral chemistry
DS1993-0585
1993
Pokhilenko, N.P.Griffin, W.L., Sobolev, N.V., Ryan, C.G., Pokhilenko, N.P., WinTrace elements in garnets and chromites: diamond formation in the SiberianlithosphereLithos, Vol. 29, pp. 235-256Russia, Commonwealth of Independent States (CIS), Siberia, YakutiaGeochemistry, Diamond genesis
DS1993-1247
1993
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev N.V., Boyd, F.R., Pearson, D.G., Shimizum N.Megacrystalline pyrope peridotites in the lithosphere of the Siberianplatform: mineralogy, geochemical pecularities and the problem of their origin.Russian Geology and Geophysics, Vol. 34, No. 1, pp. 1-12.Russia, Commonwealth of Independent States (CIS), SiberiaPyrope peridotites, Siberian Platform, Geochemistry
DS1993-1454
1993
Pokhilenko, N.P.Shimizu, N., Pokhilenko, N.P.Trace element zoning patterns of mantle garnetsGeological Society of America Annual Abstract Volume, Vol. 25, No. 6, p. A36 abstract onlySouth Africa, Russia, YakutiaGarnet dunite, Deposit -Jagersfontein, Udachnaya
DS1993-1499
1993
Pokhilenko, N.P.Sobolev, N.V., Pokhilenko, N.P., Afanasev, V.P.Kimberlite pyropes and chromites morphology and chemistry as indicators of diamond grade in Yakutian and Arkangelsk Provinces.Mid-continent diamonds Geological Association of Canada (GAC)-Mineralogical Association of Canada (MAC) Symposium ABSTRACT volume, held Edmonton May, pp. 63-70.Russia, Commonwealth of Independent States (CIS), YakutiaMineral chemistry, Diamond morphology
DS1994-1393
1994
Pokhilenko, N.P.Pokhilenko, L.N., Federov, I.I., Pokhilenko, N.P., et al.Fluid regime of formation of mantle rocks according to dat a of chromatographic analysis and thermodynamic cal.Russian Geology and Geophysics, Vol. 35, No. 4, pp. 60-64.RussiaMantle, Kimberlites
DS1994-1591
1994
Pokhilenko, N.P.Shimizu, N., Boyd, F.R., Sobolev, N.V., Pokhilenko, N.P.Chemical zoning of garnets in peridotites and diamondsMineralogical Magazine, Vol. 58A, pp. 831-832. AbstractSouth Africa, Russia, YakutiaGeochemistry, mineral inclusions, Diamond inclusions
DS1995-0192
1995
Pokhilenko, N.P.Boyd, F.R., Pokhilenko, N.P., Pearson, D.G., Sobolev, N.V.Peridotite xenoliths from the Udachnaya kimberlite pipeProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 57-59.Russia, YakutiaXenoliths, Deposit -Udachnaya
DS1995-1033
1995
Pokhilenko, N.P.Kryuchkov, A.I., Kharkiv, A.D., Pokhilenko, N.P.Identification of kimberlite bodies subjected to dynamic effect oftraps.... Yubileinaya pipe.Russian Geology and Geophysics, Vol. 36, No. 5, pp. 61-71.Russia, YakutiaSill, Trap rocks, Deposit -Jubillee, Ozernaya
DS1995-1458
1995
Pokhilenko, N.P.Pearson, D.G., Kelley, S.P., Pokhilenko, N.P., Boyd, F.R.Laser 40 Ar-39 Ar analyses of phlogopites from kimberlites and theirxenoliths: constraints eruptionProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 424-426.Russia, Yakutia, South AfricaGeochronology -eruption ages, Argon, Deposit -Mir, Udachnaya, Leningrad, Letseng, Kampfersda
DS1995-1506
1995
Pokhilenko, N.P.Pokhilenko, N.P., McDonald, J.A., Melnyk, W., McCorquodaleIndicator minerals of CL 25 kimberlite pipe, Slave Craton, northwest TerritoriesProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 444-445.Northwest TerritoriesGeochemistry -indicator minerals, Deposit -CL-25 pipe
DS1995-1507
1995
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V.Mineralogical mapping of the southeast section of the Yakutian kimberlite province and its main results.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 446-448.Russia, YakutiaMineralogy, Deposit -Olenek River Basin area
DS1995-1736
1995
Pokhilenko, N.P.Shimizu, N., Pokhilenko, N.P., Biyd, F.R., Pearson, D.G.Geochemical characteristics of mantle xenoliths from the Udachnaya kimberlite pipe.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 524-525.Russia, YakutiaGeochemistry, Deposit -Udachnaya
DS1997-0120
1997
Pokhilenko, N.P.Boyd, F.R., Pokhilenko, N.P., Finger, L.W.Composition of the Siberian Cratonic mantle: evidence from Udachnaya peridotite xenoliths.Contributions to Mineralogy and Petrology, Vol. 128, No. 2-3, pp. 228-246.RussiaSiberian Craton, Deposit - Udachnaya
DS1997-0917
1997
Pokhilenko, N.P.Pokhilenko, N.P., McDonald, J., Melnik, U., McCorquodaleIndicator minerals of CL-25 kimberlite pipe Slave Craton, NorthwestTerritories, Canada.Russian Geology and Geophysics, Vol. 38, No. 2, pp. 550-558.Northwest TerritoriesGeochemistry, Deposit - CL-25
DS1998-0009
1998
Pokhilenko, N.P.Afanasiev, V.P., Pokhilenko, N.P., Logvinova, A.M.Problem of false indicators for kimberlites and lamproites ( on the exampleof chromites).7th International Kimberlite Conference Abstract, pp. 7-8.Russia, Yakutia, ArkangelskMineralogy - chromium spinels
DS1998-1174
1998
Pokhilenko, N.P.Pokhilenko, N.P., McDonald, J.A., Melnyk, Hall, ShimizuKimberlites of Camsell Lake field and some features of construction and composition of lithosphere roots...7th. Kimberlite Conference abstract, pp. 699-701.Northwest TerritoriesCraton - Slave, Deposit - Camsell Lake
DS1998-1175
1998
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V., Kuligin, ShimizuPeculiarities of pyroxenite paragenesis garnets distribution in Yakutian kimberlites .. craton mantle7th. Kimberlite Conference abstract, pp. 702-4.Russia, Siberia, YakutiaCraton - lithospheric mantle evolution, Magmatism
DS1998-1340
1998
Pokhilenko, N.P.Shimizu, N., Pokhilenko, N.P., Boyd, F.R., Pearson, D.Trace element characteristics of garnet dunites/harzburgites, host rocks for peridotite diamond7th International Kimberlite Conference Abstract, pp. 803-4.Russia, SiberiaMineral chemistry, Peridotite diamonds
DS1998-1341
1998
Pokhilenko, N.P.Shimizu, N., Pokhilenko, N.P., McDonald, J.A.Geochemical characteristics of the Slave Craton lithosphere: a view heavy mineral concentrate garnets7th International Kimberlite Conference Abstract, pp. 805-6.Northwest TerritoriesGeochemistry, Peridotite diamonds
DS1999-0561
1999
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V., Kuligin, S.S., ShimizuPeculiarities of distribution of pyroxenite paragenesis garnets in Yakutian kimberlites and some aspects of...7th International Kimberlite Conference Nixon, Vol. 2, pp. 689-98.Russia, Yakutia, KharamaiCraton - evolution of Siberian craton, petrography, Udachnaya, Obnazhennaya
DS1999-0664
1999
Pokhilenko, N.P.Shimizu, N., Pokhilenko, N.P., Boyd, F.R., Pearson, D.Trace element characteristics of garnet dunites /harzburgites. Host rocks for Siberian peridotitic ..7th International Kimberlite Conference Nixon, Vol. 2, pp. 773-82.Russia, Siberia, YakutiaPeridotite - diamond, geochemistry, Deposit - Udachnaya
DS2000-0771
2000
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V., Chernyi, S.D., YanginPyropes and chromites from kimberlites in the Nakyn Field, and Snipe Lake (Slave River region) Evidence...Doklady Academy of Sciences, Vol. 372, No. 4, May-June pp. 638-42.Northwest Territories, Russia, YakutiaLithosphere - structure, Deposit - Nakyn, Snipe Lake
DS2001-0934
2001
Pokhilenko, N.P.Pokhilenko, N.P., McDonald, Hall, SobolevAbnormally thick Cambrian lithosphere of the southeast Slave Craton evidence from crystalline inclusions ..Slave-Kaapvaal Workshop, Sept. Ottawa, 3p. abstractNorthwest TerritoriesDiamonds and pyrope compositions - kimberlites, Deposit - Snap Lake
DS2001-0935
2001
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, McDonald, Hall, YefimovaCrystalline inclusions in diamonds from kimberlites of the Snap lake area: new evidence anomalous lithosphereDoklady Academy of Sciences, Vol. 381, No. 7, Sept/Oct. pp. 806-11.Northwest TerritoriesDiamond - inclusions, Deposit - Snap Lake
DS2001-0936
2001
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V., McDonald, Hall et alCrystalline inclusions in diamonds from kimberlites of the Snap lake: new evidence anomalous lithosphericDoklady Academy of Sciences, Vol. 380, No. 7, Sept-Oct. pp.806-12.Northwest TerritoriesDiamond - inclusions, Deposit - Snap lake
DS2002-0591
2002
Pokhilenko, N.P.Golovin, A.V., Sharygin, V.V., Pokhilenko, N.P., Malkovets, V.G., KoelsovSecondary melt inclusions in olivine from unaltered kimberlites of the Udachnaya East pipe, Yakutia.Doklady Earth Sciences, Vol. 388,1,pp. 93-96.Russia, YakutiaPetrology, deposit - Udachnaya
DS2002-1328
2002
Pokhilenko, N.P.Reutskii, V.N., Pokhilenko, N.P., Hall, A.E., Sobolev, N.V.Polygenous character of diamonds from kimberlites of the Snap lake region ( SlaveDoklady Earth Sciences, Vol. 386, 7, Sept-Oct.pp. 791-4.Northwest TerritoriesDiamond - morphology, Deposit - Snap Lake
DS2002-1772
2002
Pokhilenko, N.P.Zedgenizov, D.A., Pokhilenko, N.P., Rylov, G.M., Milledge, J.H., Jones, A.P.Assorted diamond population from Snap lake mine ( Canada)18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.116Northwest TerritoriesDiamond - morphology
DS2003-0043
2003
Pokhilenko, N.P.Ashchepkov, I.V., Vladykin, N.V., Pokhilenko, N.P., et al.Clinopyroxene geotherms for the mantle columns beneath kimberlite pipes from8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, POSTER abstractRussia, SiberiaGeothermometry
DS2003-0479
2003
Pokhilenko, N.P.Golovin, A.V., Sharygin, V.V., Pokhilenko, N.P., Malkovets, V.G., KolesavSecondary melt inclusions in olivine from unaltered kimberlites of the Udachnaya EastDoklady Earth Sciences, Vol. 388,1, pp. 93-96.Russia, YakutiaInclusions, Deposit - Udachnaya
DS2003-0480
2003
Pokhilenko, N.P.Golovin, A.V., Sharygin, V.V., Pokhilenko, N.P., Malkovets, V.G., Sobolev, N.V.Secondary melt inclusions in olivine from unaltered kimberlites of the Udachnaya8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractRussia, YakutiaDeposit - Udachnaya
DS2003-0870
2003
Pokhilenko, N.P.Malkovets, V.G., Taylor, L.A., Griffin, W.L., O'Reilly, S., Pokhilenko, N.P.Eclogites from the Grib kimberlite pipe, Arkangelsk, Russia8ikc, Www.venuewest.com/8ikc/program.htm, Session 2, POSTER abstractRussia, ArkangelskEclogites and Diamonds, Deposit - Grib
DS2003-0871
2003
Pokhilenko, N.P.Malygina, E.V., Pokhilenko, N.P., Sobolev, N.V.Coarse peridotite xenoliths of Udachnaya kimberlite pipe, Yakutia: garnetization of8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, POSTER abstractRussia, Siberia, YakutiaDeposit - Udachnaya
DS2003-1090
2003
Pokhilenko, N.P.Pokhilenko, N.P., Agashev, A.M., McDonald, J.A., Sobolev, N.V., MityukhinKimberlites of the Nakyn field, Siberia and the Snap Lake King Lake dyke system8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractNorthwest TerritoriesDeposit - Snap Lake, King Lake
DS2003-1091
2003
Pokhilenko, N.P.Pokhilenko, N.P., Agashev, A.M., McDonald, J.A., Vavilov, M.A., Clark, D.B..Kimberlites and carbonatites of the Snap Lake King Lake dyke system: structural8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractNorthwest TerritoriesDeposit - Snap Lake, King Lake
DS2003-1092
2003
Pokhilenko, N.P.Pokhilenko, N.P., Griffin, W.L., Shimizu, N., McLean, R.C., Malkovets, V.G.Pyropes and chromites of the Snap Lake King Lake kimberlite dyke system in relation8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, POSTER abstractNorthwest TerritoriesDeposit - Snap Lake King Lake
DS2003-1093
2003
Pokhilenko, N.P.Pokhilenko, N.P., McDonald, J.A., Sobolev, N.V., Reutsky, V.N., Hall, A.E.Crystalline inclusions and C isotope composition of diamonds from the Snap lake/King8 Ikc Www.venuewest.com/8ikc/program.htm, Session 3, AbstractNorthwest TerritoriesDiamonds - geochronology, Deposit - Snap Lake
DS2003-1094
2003
Pokhilenko, N.P.Pokhilenko, N.P., McDonald, J.A., Turner, R.C.Snap Lake kimberlite dyke system - history and methods of a new type of largeGeological Association of Canada Annual Meeting, Abstract onlyNorthwest TerritoriesTechniques
DS2003-1258
2003
Pokhilenko, N.P.Sharygin, V.V., Golovin, A.V., Pokhilenko, N.P.Djerfisherite from unaltered kimberlites of the Udachnaya eastern pipe, Yakutia8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractRussia, YakutiaDeposit - Udachnaya
DS2003-1259
2003
Pokhilenko, N.P.Sharygin, V.V., Golovin, A.V., Pokhilenko, N.P., Sobolev, N.V.Djerfisherite in unaltered kimberlites of the Udachnaya East pipe, YakutiaDoklay Earth Sciences, Vol. 390, 4, May-June pp. 554-8.RussiaMineralogy, Deposit - Udachnaya
DS200412-0064
2003
Pokhilenko, N.P.Ashchepkov, I.V., Vladykin, N.V., Pokhilenko, N.P., et al.Clinopyroxene geotherms for the mantle columns beneath kimberlite pipes from Siberian Craton.8 IKC Program, Session 6, POSTER abstractRussia, SiberiaMantle petrology Geothermometry
DS200412-0686
2003
Pokhilenko, N.P.Golovin, A.V., Sharygin, V.V., Pokhilenko, N.P., Malkovets, V.G., Sobolev, N.V.Secondary melt inclusions in olivine from unaltered kimberlites of the Udachnaya eastern pipe, Yakutia.8 IKC Program, Session 7, POSTER abstractRussia, YakutiaKimberlite petrogenesis Deposit - Udachnaya
DS200412-1213
2003
Pokhilenko, N.P.Malygina, E.V., Pokhilenko, N.P., Sobolev, N.V.Coarse peridotite xenoliths of Udachnaya kimberlite pipe, Yakutia: garnetization of peridotites of the central Siberian platform8 IKC Program, Session 6, POSTER abstractRussia, Siberia, YakutiaMantle petrology Deposit - Udachnaya
DS200412-1561
2003
Pokhilenko, N.P.Pokhilenko, N.P., Agashev, A.M., McDonald, J.A., Sobolev, N.V., Mityukhin, S.I., Vavilov, M.A., Yanygin, Y.T.Kimberlites of the Nakyn field, Siberia and the Snap Lake King Lake dyke system, Slave Craton, Canada: a new variety of kimberli8 IKC Program, Session 7, POSTER abstractCanada, Northwest TerritoriesKimberlite petrogenesis Deposit - Snap Lake, King Lake
DS200412-1562
2003
Pokhilenko, N.P.Pokhilenko, N.P., Agashev, A.M., McDonald, J.A., Vavilov, M.A., Clark, D.B., Wright, K.J.Kimberlites and carbonatites of the Snap Lake King Lake dyke system: structural setting, petrochemistry and petrology of a uniqu8 IKC Program, Session 7, POSTER abstractCanada, Northwest TerritoriesKimberlite petrogenesis Deposit - Snap Lake, King Lake
DS200412-1563
2003
Pokhilenko, N.P.Pokhilenko, N.P., Griffin, W.L., Shimizu, N., McLean, R.C., Malkovets, V.G., Pokhilenko, L.N., Malygina, E.V.Pyropes and chromites of the Snap Lake King Lake kimberlite dyke system in relation to the problem of the southern Slave Craton8 IKC Program, Session 6, POSTER abstractCanada, Northwest TerritoriesMantle petrology Deposit - Snap Lake King Lake
DS200412-1564
2003
Pokhilenko, N.P.Pokhilenko, N.P., McDonald, J.A., Sobolev, N.V., Reutsky, V.N., Hall, A.E., Logvinova, A.M., Reimers, L.F.Crystalline inclusions and C isotope composition of diamonds from the Snap lake/King Lake kimberlite dyke system: evidence for a8 IKC Program, Session 3, AbstractCanada, Northwest TerritoriesDiamonds - geochronology Deposit - Snap Lake
DS200412-1565
2003
Pokhilenko, N.P.Pokhilenko, N.P., McDonald, J.A., Turner, R.C.Snap Lake kimberlite dyke system - history and methods of a new type of large primary diamond deposit discovery.Geological Association of Canada Annual Meeting, Abstract onlyCanada, Northwest TerritoriesTechniques
DS200412-1566
2004
Pokhilenko, N.P.Pokhilenko, N.P., Sobolev, N.V., Reutsky, V.N., Hall, A.E., Taylor, L.A.Crystalline inclusions and C isotope ratios in diamonds from the Snap Lake/King Lake kimberlite dyke system: evidence of ultradeLithos, Vol. 77, 1-4, Sept. pp. 57-67.Canada, Northwest TerritoriesDiamond inclusions, Carbon isotopes
DS200412-1592
2004
Pokhilenko, N.P.Promprated, P., Taylor, L.A., Anand, M., Floss, C., Sobolev, N.V., Pokhilenko, N.P.Multiple mineral inclusions in diamonds from the Snap Lake/King Lake kimberlite dike, Slave Craton: a trace element perspective.Lithos, Vol. 77, 1-4, Sept. pp. 69-81.Canada, Northwest TerritoriesDiamond inclusions, trace element, REE, in situ analysi
DS200412-1797
2003
Pokhilenko, N.P.Sharygin, V.V., Golovin, A.V., Pokhilenko, N.P.Djerfisherite from unaltered kimberlites of the Udachnaya eastern pipe, Yakutia.8 IKC Program, Session 7, POSTER abstractRussia, YakutiaKimberlite petrogenesis Deposit - Udachnaya
DS200412-1798
2003
Pokhilenko, N.P.Sharygin, V.V., Golovin, A.V., Pokhilenko, N.P., Sobolev, N.V.Djerfisherite in unaltered kimberlites of the Udachnaya East pipe, Yakutia.Doklady Earth Sciences, Vol. 390, 4, May-June pp. 554-8.RussiaMineralogy Deposit - Udachnaya
DS200412-2181
2004
Pokhilenko, N.P.Yelisseyev, A.P., Pokhilenko, N.P., Steeds, J.W., Zedgenizov, D.A., Afanasiev, V.P.Features of coated diamonds from the Snap Lake/King Lake kimberlite dyke, Slave Craton, Canada, as revealed by optical topographLithos, Vol. 77, 1-4, Sept. pp. 83-97.Canada, Northwest TerritoriesCoated diamonds, absorption, luminescence, nickel, nitr
DS200512-0007
2004
Pokhilenko, N.P.Agashev, A.M., Pokhilenko, N.P., Tolstov, A.V., Polyanichko, Malkovets, SobolevNew age dat a on kimberlites from the Yakutian Diamondiferous Province.Doklady Earth Sciences, Vol. 399, 8, pp.1142-1145.Russia, YakutiaGeochronology
DS200512-0495
2004
Pokhilenko, N.P.Kamenetsky, M.B., Sobolev, A.V., Kamenetsky, V.S., Maas, R., Danyushevsky, L.V., Thomas, R., Pokhilenko, N.P., Sobolev, N.V.Kimberlite melts rich in alkali chlorides and carbonates: a potent metasomatic agent in the mantle.Geology, Vol. 32, 10, Oct. pp. 845-848.Russia, Siberia, YakutiaUdachnaya, Group I, volatiles, metasomatism, inclusions
DS200512-0760
2004
Pokhilenko, N.P.Nadolinnyi, V.A., Yreva, O.P., Yelisseyev, A.P., Pokhilenko, N.P., Chepurov, A.A.Disruption of B1 nitrogen defects in 1aB natural diamonds.Doklady Earth Sciences, Vol. 399A, Nov-Dec. pp. 1228-1272.Diamond morphology
DS200512-0966
2004
Pokhilenko, N.P.Sharygin, V.V., Golovin, A.V., Pokhilenko, N.P.Genesis of djerfisherite from kimberlites and xenoliths of the Udachnaya diatreme, Yakutia Russia.Deep seated magmatism, its sources and their relation to plume processes., pp. 236-256.RussiaMineralogy
DS200612-0004
2006
Pokhilenko, N.P.Agashev, A.M., Pokhilenko, N.P., Malkovets, V.G., Sobolev, N.V.Sm Nd isotopic system in garnet megacrysts from the Udachnaya kimberlite pipe (Yakutia) and petrogenesis of kimberlites.Doklady Earth Sciences, Vol. 407A, 3, pp. 491-494.Russia, YakutiaGeochronology - Udachnaya
DS200612-0045
2005
Pokhilenko, N.P.Ashchepkov, I.V., Vladykin, N.V., Pokhilenko, N.P., Rotman, A.Y., Afansiev, V.P., Logvinova, A.M.Using the monomineral thermobarometry for the reconstruction of the mantle sections.Problems of Sources of Deep Magmatism and Plumes., pp. 210-228.MantleGeothermometry
DS200712-0032
2007
Pokhilenko, N.P.Ashchepkov, I.V., Pokhilenko, N.P., Logvinova, A.M., Vladykin, N.P., Rotman, Palessky, Alymova, VishnyakovaEvolution of kimberlite magmatic sources beneath Siberia.Plates, Plumes, and Paradigms, 1p. abstract p. A39.RussiaMir
DS200712-0922
2007
Pokhilenko, N.P.Rylov, G.M., Fedorova, E.N., Logvinova, A.M., Pokhilenko, N.P., Kulipanov, G.N., Sobolev, N.V.The peculiarities of natural plastically deformed diamond crystals from Internationalnaya pipe, Yakutia.Nuclear Instruments and Methods in Physics Research Section A., Vol. 575, 1-2, pp. 152-154.RussiaDiamond morphology
DS200712-0970
2007
Pokhilenko, N.P.Sharygin, V.V., Kamenetsky, V.S., Kamenetskaya, M.B., Seretkin, Yu.V., Pokhilenko, N.P.Rasvumite from the Udachnaya East pipe: the first finding in kimberlites.Doklady Earth Sciences, Vol. 445, 6, pp. DOI:10.1134/S1028334 X07060232Russia, YakutiaMineralogy
DS200812-0003
2008
Pokhilenko, N.P.Agashev, A.M., Kuligan, S.S., Orihashi, Y., Pokhilenko, N.P., Vavilov, M.A., Clarke, D.Ages of zircons from Jurassic sediments of Bluefish River slope, NWT and the possible age of kimberlite activity in the Lena West property.Doklady Earth Sciences, Vol. 421, 1, pp. 751-754.Canada, Northwest TerritoriesDeposit - Lena West, geochronology
DS200812-0004
2008
Pokhilenko, N.P.Agashev, A.M., Pokhilenko, N.P., Takazawa, E., McDonald, J.A., Vavilov, M.A., Watanabe, T., Sobolev, N.V.Primary melting sequence of a deep ( >250 km) lithospheric mantle as recorded in the geochemistry of kimberlite carbonatite assemblages, Snap Lake dyke system, Canada.Chemical Geology, Vol. 255, 3-4, pp. 317-328.Canada, Northwest TerritoriesDeposit - Snap Lake
DS200812-0050
2008
Pokhilenko, N.P.Ashcheperov, I.V., Pokhilenko, N.P., Vladykin, N.P., Logovina, A.M., Nikoleva,I., Palessky, RotmanMelts in mantle columns beneath Siberian kimberlites.Goldschmidt Conference 2008, Abstract p.A35.Russia, SiberiaDeposit - Alkite
DS200812-0423
2008
Pokhilenko, N.P.Golovin, A.V., Kamenetsky, M.B., Kamenetsky, V.S., Sharygin, V.V., Pokhilenko, N.P.Groundmass of unaltered kimberlites of the Udachnaya East pipe (Yakutia Russia): a sample of the kimberlite melt.9IKC.com, 3p. extended abstractRussiaDeposit - Udachnaya
DS200812-0539
2008
Pokhilenko, N.P.Kamenetsky, V.S., Kamenetsky, M.B., Golovin, A.V., Maas, R., Sharygin, V.V., Pokhilenko, N.P.Salty kimberlite of the Udachnaya East pipe ( Yakutia, Russia): a petrological oddity, victim of contamination or a new magma type?9IKC.com, 3p. extended abstractRussiaDeposit - Udachnaya - taste!
DS200812-0798
2008
Pokhilenko, N.P.Nikolenko, E.I., Afanasev, V.P., Pokhilenko, N.P.Garnets of crustal parageneses in alluvial deposits of the eastern Siberian platform: genesis and search significance.Russian Geology and Geophysics, Vol. 49, pp. 655-666.Russia, YakutiaMuna Markha drainage
DS200812-0905
2008
Pokhilenko, N.P.Pokhilenko, L.N., Pokhilenko, N.P., Fedorov, L.I., Tomilenko, A.A., Usova, L.V., Fomina, L.N., Sobolev, V.S.Fluid regime pecularities of the lithosphere mantle of the Siberian Platform.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., 2008 pp. 122-136.Russia, SiberiaMantle chemistry
DS200812-0906
2008
Pokhilenko, N.P.Pokhilenko, N.P.Permo-Triassic superplume and its influence to the Siberian lithospheric mantle.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., 2008 pp. 41-53.Russia, SiberiaPlume, hot spots
DS200812-0987
2007
Pokhilenko, N.P.Rylov, G.M., Fedorova, E.N., Logvinova, A.M., Pokhilenko, N.P.The pecularities of natural plastically deformed diamond crystals from International pipe.Nuclear Instruments and Methods in Physics Research Section A., Vol. 575, no. 1/2, pp. 152-154.TechnologyDeposit - International
DS200812-1092
2008
Pokhilenko, N.P.Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Pokhilenko, N.P., Kuzmin, D.V., Sobolev, A.V.Olivine inclusions in Siberian diamonds: high precision approach to minor elements.European Journal of Mineralogy, Vol. 20, no. 3, pp. 305-315.Russia, SiberiaDiamond inclusions
DS200812-1190
2008
Pokhilenko, N.P.Tychkov, N.S., Pokhilenko, N.P., Kuligin, S.S., Malygina, E.V.Composition and origin of peculiar pyropes from lherzolites: evidence for the evolution of the lithospheric mantle of the Siberian Platform.Russian Geology and Geophysics, Vol. 49, 4, pp. 225-239.RussiaMineralogy - garnets
DS200912-0003
2009
Pokhilenko, N.P.Afanasyev, V.P., Agashev, A.M., Orihashi, Y., Pokhilenko, N.P., Sobolev, N.V.Paleozoic U Pb age of rutile inclusions in diamonds of the V-VII variety from placers of the northeast Siberian platform.Doklady Earth Sciences, Vol. 428, 1, pp. 1151-1155.RussiaDiamond inclusions
DS200912-0112
2009
Pokhilenko, N.P.Chepurov, A.I., Zhimulev, E.I., Sonin, V.M., Chepurov, A.A., Pokhilenko, N.P.Crystallization of diamond in metal sulfide melts.Doklady Earth Sciences, Vol. 428, 1, pp. 1139-1141.MantleDiamond morphology, geochemistry
DS200912-0470
2009
Pokhilenko, N.P.Malkovets, V.G., Belousova, E.A., Griffin, W.L., Buzlukova, L.V., Shatsky, V.S., O'Reilly, S.Y., Pokhilenko, N.P.U/Pb dating of zircons from the lower crustal xenoliths from Siberian kimberlites.Goldschmidt Conference 2009, p. A823 Abstract.Russia, SiberiaDeposit - Udachnaya
DS200912-0529
2009
Pokhilenko, N.P.Nadolinny, V.A., Yurjeva, O.P., Pokhilenko, N.P.EPR and luminescence dat a on the nitrogen aggregation in diamonds from Snap Lake dyke system.Lithos, In press - available 19p.Canada, Northwest TerritoriesDeposit - Snap Lake
DS200912-0589
2009
Pokhilenko, N.P.Pokhilenko, N.P.Polymict breccia xenoliths: evidence for the complex character of kimberlite formation.Lithos, In press - available 29p.Russia, Africa, South AfricaDeposit - Premier, Sytykanskaya
DS200912-0707
2008
Pokhilenko, N.P.Sobolev, N., Wirth, R., Logvinova, A.M., Pokhilenko, N.P., Kuzmin, D.V.Retrograde phase transitions of majorite garnets included in diamonds: a case study of subcalcic Cr rich majorite pyrope from a Snap Lake diamond, Canada.American Geological Union, Fall meeting Dec. 15-19, Eos Trans. Vol. 89, no. 53, meeting supplement, 1p. abstractCanada, Northwest TerritoriesDeposit - Snap lake
DS200912-0708
2009
Pokhilenko, N.P.Sobolev, N.V., Logvinova, A.M., Zedgenizov, D.A., Pokhilenko, N.P., Malygina, E.V., Kuzmin, D.V., Sobolev, A.V.Petrogenetic significance of minor elements in olivines from diamonds and peridotite xenoliths from kimberlites of Yakutia.Lithos, In press - available 38p.Russia, YakutiaDiamond inclusions
DS201012-0005
2010
Pokhilenko, N.P.Agashev, A.M., Pokhilenko, N.P., Cherepanova, Yu.V., Golovin, A.V.Geochemical evolution of rocks at the base of the lithospheric mantle: evidence from study of xenoliths of deformed peridotites from kimberlite of UdachnayaDoklady Earth Sciences, Vol. 432, 2, pp. 746-749.RussiaDeposit - Udachnaya
DS201012-0335
2009
Pokhilenko, N.P.Kamenetsky, V.S., Kamenetsky, M.B., Sobolev, A.V., Golovin, A.V., Sharyginb, V.V., Pokhilenko, N.P., Sobolev, N.V.Can pyroxenes be liquidus minerals in the kimberlite magma?Lithos, Vol. 112 S pp. 213-235.MantleChemistry
DS201012-0541
2010
Pokhilenko, N.P.Nikolenko, E.I., Afanasev, V.P., Pokhilenko, N.P.Pecularities of the composition of zoned picroilmenites from the Massadou field, (Guinea) and Dachanya pipe ( Yakutia) kimberlites.Doklady Earth Sciences, Vol. 434, 2, pp.1386-1389.Africa, Guinea, RussiaGeochemistry - Massadou, Dachanaya
DS201012-0590
2010
Pokhilenko, N.P.Pokhilenko, N.P., Afanasev, V.P., Vavilov, M.A.Behaviour of kimberlite indicator minerals during the formation of mechanical dispersion halos in glacial settings.Lithology and Mineral Resources, Vol. 45, 4, pp. 324-329.Canada, Northwest TerritoriesDeposit - CL 25
DS201012-0741
2010
Pokhilenko, N.P.Sonin, V.M., Zhimulev, E.I., Chepurov, A.I., Afanasev, V.P., Pokhilenko, N.P.High pressure etching of diamond in chloride melt in the presence of aqueous fluid.Doklady Earth Sciences, Vol. 434, 2, pp. 1359-1361.TechnologyUHP
DS201112-0005
2011
Pokhilenko, N.P.Afanasev, V.P., Lobanov, S.S., Pokhilenko, N.P., Koptil, Mityukhin, Gerasimchuk, Pomazanski, GorevPolygenesis of diamonds in Siberian Platform. Five groups of diamonds have been distinquished.Russian Geology and Geophysics, Vol.l 52, pp. 259-274.Russia, SiberiaDiamond placers, alluvials
DS201112-0006
2010
Pokhilenko, N.P.Afanasiev, V.P., Tychkov, N.S., Pokhilenko, N.P., Ovchinnikov, Yu.I.About kimberlite indicator minerals in the Triassic tuffs of the Tunguska sineclise.Doklady Earth Sciences, Vol. 435, 2, pp. 1555-1559.RussiaDiamond exploration
DS201112-0465
2011
Pokhilenko, N.P.Ionov, D.A., Doucet, L.S., Carlson, R.W., Pokhilenko, N.P., Golovin, A.V., Ashchepkov, I.V.Peridotite xenolith inferences on the formation and evolution of the central Siberian cratonic mantle.Goldschmidt Conference 2011, abstract p.1085.Russia, SiberiaUdachnaya
DS201112-0606
2010
Pokhilenko, N.P.Litasov, K.D., Sharygin, I.S., Shatskiy, A.F., Ohtani, E., Pokhilenko, N.P.Experimental constraints on the role of chloride in the origin and evolution of kimberlitic magma.Doklady Earth Sciences, Vol. 435, 2, pp. 1641-1646.MantleMineralogy
DS201112-0608
2011
Pokhilenko, N.P.Litasov, K.D., Shatskiy, A.F., Pokhilenko, N.P.Phase relations and melting in the systems of peridotite H2O CO2 and eclogite H2OCO2 at pressures up to 27 GPa.Doklady Earth Sciences, Vol. 437, 2, pp. 498-502.MantleUHP
DS201112-0807
2010
Pokhilenko, N.P.Pokhilenko, L.N., Pokhilenko, N.P., Vladykin, N.V.Garnet orthopyroxenites from the Udachnaya kimberlite pipe ( Yakutia): features of their composition and orogin.Vladykin, N.V., Deep Seated Magmatism: its sources and plumes, pp. 128-144.Russia, YakutiaMineralogy - genesis
DS201112-0808
2011
Pokhilenko, N.P.Pokilanko, L.N., Golovin, A.V., Shrygin, I.S., Pokhilenko, N.P.Accessory minerals of mantle xenoliths: first finds of Cl-free K-Fe sulphides.Doklady Earth Sciences, Vol. 440, 2, pp. 1404-1409.MantleXenolith petrology
DS201112-0942
2011
Pokhilenko, N.P.Sharygin, I.S., Golovin, A.V., Pokhilenko, N.P.Djerfisherite in kimberlites of the Kuoikskoe field as an indicator of enrichment of kimberlite melts in chlorine.Doklady Earth Sciences, Vol. 436, 2, pp. 219-223.RussiaPetrology
DS201112-1063
2011
Pokhilenko, N.P.Tychkov, N.S., Agashev, A.M., Pokhilenko, N.P., Bzhan, I.S.Estimation of the refertilization grade of lithosphere roots by the chemical composition of garnets from Siberian kimberlites.Doklady Earth Sciences, Vol. 439, 2, pp.1175-1178.Russia, SiberiaGeochemistry - garnets
DS201212-0005
2012
Pokhilenko, N.P.Agashev, A.M., Ionov, D.A., Pokhilenko, N.P., Golovin, A.V., Surgutonova, E.A., Sharygin, I.S.Metasomatism in cratonic mantle root: insight from geochemistry of deformed peridotite xenoliths of Udachnaya pipe.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaDeposit - Udachnaya
DS201212-0006
2012
Pokhilenko, N.P.Agashev, A.M., Orihashi, Y., Rotman, A.Ua., Pokhilenko, N.P., erov, I.V., Tolstov, A.V.Rutile and titanite as the minerals for dating kimberlite emplacement age: an example of Amakinskaya and Taezhnaya pipes of Mirny field, Siberia10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaDeposit - Mirny field
DS201212-0252
2012
Pokhilenko, N.P.Golovin, A.V., Sherygin, I.S., Korsakov, A.V., Pokhilenko, N.P.Can be parental kimberlite melts alkali-carbonate liquids: results investigations composition melt inclusions in mantle xenoliths from kimberlites.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractMantleMelting
DS201212-0412
2012
Pokhilenko, N.P.Litasov, K.D., Shatskiy, A., Ohtani, E., Pokhilenko, N.P.Melting phase relations in the systems peridotite-H2O-CO2 and eclogite-H2O-CO2 at pressures up to 27 Gpa.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractMantleMelting
DS201212-0438
2012
Pokhilenko, N.P.Malkovets, V.G., Griffin, W.L., Pearson, N.J., Rezvukhin, D.I., Oreilly, S.Y., Pokhilenko, N.P., Garanin, V.K., Spetsius, Z.V., Litasov, K.D.Late metasomatic addition of garnet to the SCLM: Os-itope evidence.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractMantleMetasomatism
DS201212-0439
2012
Pokhilenko, N.P.Malkovets, V.G., Griffin, W.L., Pokhilenko, N.P., O'Reilly, S.Y., Dak, A.I., Tolstov, A.V., Serov, I.V., Bazhan, I.S., Kuzmin, D.V.Lithosphere mantle structure beneath the Nakyn kimberlite field, Yakutia.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaDeposit - Nakyn
DS201212-0440
2012
Pokhilenko, N.P.Malygina, E.V., Pokhilenko, N.P.Pecurlarities of composition of coarse peridotite xenoliths of some kimberlite pipes of South Africa.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, South AfricaDeposit - Bells Bank, Roberts Victor, Wesselton, Bostoff Road
DS201212-0561
2012
Pokhilenko, N.P.Pokhilenko, N.P.Mineralogical and petrological evidences of lithosphere thickness variations inside ancient cratons.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, Canada, Northwest TerritoriesCraton
DS201212-0562
2012
Pokhilenko, N.P.Pokhilenko, N.P., Afanasev, V.P., McDonald, J.A., Vavilov, M.A., Kulgin, S.S., Pokhilenko, L.N., Golovin, A.V., Agashev, A.M.Kimberlite indicator minerals in terrigene sediments of lower part of Mackenzie River Basin, NWT, Canada: evidence of new craton with thick lithosphere.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, Northwest TerritoriesGeochemistry - KIMS
DS201212-0583
2012
Pokhilenko, N.P.Rezvukhin, D.I., Malkovets, V.G., Gibsher, A.A., Kuzmin, D.V., Griffin, W.L., Pokhilenko, N.P., O'Reilly, S.Y.Mineral inclusions in pyropes from some kimberlite pipes of Yakutia.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, YakutiaDeposit - Internationskaya
DS201212-0636
2012
Pokhilenko, N.P.Sharygin, I.S., Golovin, A.V., Pokhilenko, N.P.Djerfisherite in xenoliths of sheared peridotite in the Udachanaya East pipe ( Yakutia): origin and relationship with kimberlitic magmatism.Russian Geology and Geophysics, Vol. 53, 3, pp. 247-261.Russia, YakutiaDeposit - Udachnaya
DS201212-0637
2012
Pokhilenko, N.P.Sharygin, I.S., Golovin, A.V., Pokhilenko, N.P.Djerfisherite in kimberlite - hosted mantle xenoliths: textural features, composition and origin.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussiaDeposit - Udachnaya East
DS201212-0638
2012
Pokhilenko, N.P.Sharygin, I.S., Litasov, K.D., Shatskiy, A., Golovin, A.V., Ohtani, E., Pokhilenko, N.P.Melting phase relations of chlorine bearing kimberlite at 2.1-6.5 GPA and 900-1500 ON10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractMantleMelting
DS201212-0642
2012
Pokhilenko, N.P.Shchukina, E.V., Malkovets, V.G., Golovin, N.N., Pokhilenko, N.P.Peridotitic mantle section beneath V Grib kimberlite pipe ( Arkhangelsk region, Russia): mineralogical composition P-T conditions, metasomatism.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, Archangel, Kola PeninsulaDeposit - Grib
DS201212-0643
2012
Pokhilenko, N.P.Shchulina, E.V., Golovin, N.N., Malkovets, V.G., Pokhilenko, N.P.Mineralogy and equilibrium P-T estimates for peridotite assemblages from the V Grib kimberlite pipe (Arkangelsk kimberlite province).Doklady Earth Sciences, Vol. 444, 2, pp. 776-781.Russia, Kola Peninsula, ArchangelDeposit - Grib
DS201212-0739
2012
Pokhilenko, N.P.Tychkov, N.S., Agashev, A.M., Pokhilenko, N.P.Refertilisation grade estimations of lithosphere roots by the chemical composition of garnets from Siberian kimberlites.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, SiberiaGarnet
DS201312-0008
2013
Pokhilenko, N.P.Afanasiev, V.P., Snegirev, O.V., Tychkov, N.S., Pokhilenko, N.P.Stability of kimberlite garnets exposed to chemical weathering: relationship with Cr contents.Doklady Earth Sciences, Vol. 448, 1, pp. 103-105.TechnologyGarnet mineralogy
DS201312-0401
2014
Pokhilenko, N.P.Howarth, G.H., Barry, P.H., Pernet-Fisher, J.F., Baziotis, I.P., Pokhilenko, N.P., Pokhilenko, L.N., Bodnar, R.J., Taylor, L.A.Superplume metasomatism: evidence from Siberian mantle xenoliths.Lithos, Vol. 184-187, pp. 209-224.Russia, SiberiaMetasomatism
DS201312-0534
2013
Pokhilenko, N.P.Letnikova, E.F., Lobanov, S.S., Pokhilenko, N.P., Izokh, A.E., Nikolenko, E.I.Sources of clastic material in the Carnian diamond bearing horizon of the northeastern part of the Siberian Platform.Doklady Earth Sciences, Vol. 451, 1, pp. 702-705.Russia, SiberiaCarnion
DS201312-0714
2013
Pokhilenko, N.P.Pokhilenko, N.P., Afanasiev, V.P.New prospective for diamond deposits in Siberia.PDAC 2013, March 4, 1/2p. Abstract only as conflict in his scheduleRussiaOverview - Siberia
DS201312-0803
2013
Pokhilenko, N.P.Sharygin, I.S., Litasov, K.D., Shatskiy, A., Golovin, A.V., Ohtani, E., Pokhilenko, N.P.Melting phase relations in Udachnaya-East kimberlite and search for parental melt composition. Group IGoldschmidt 2013, AbstractRussiaDeposit - Udachnaya
DS201312-1016
2013
Pokhilenko, N.P.Zhimulev, E.I., Shein, M.A., Pokhilenko, N.P.Diamond crystallization in the Fe-S-C system.Doklady Earth Sciences, Vol. 451, 1, pp. 729-731.TechnologyDiamond morphology
DS201412-0373
2014
Pokhilenko, N.P.Howarth, G.H., Barry, P.H., Pernet-Fisher, J.F., Baziotis, I.P., Pokhilenko, N.P., Poikhilenko, L.N., Bodnar, R.L., Taylor, L.A., Agashev, A.M.Superplume metasomatism: evidence from Siberian mantle xenoliths.Lithos, Vol. 184-187, pp. 209-224.RussiaMetasomatism
DS201412-0698
2014
Pokhilenko, N.P.Pokhilenko, L.N., Malkovets, V.G., Kuzmin, D.V., Pokhilenko, N.P.New dat a on the mineralogy of megacrystalline pyrope peridotite from the Udachnaya kimberlite pipe, Siberian Craton, Yakutian Diamondiferous province.Doklady Earth Sciences, Vol. 454. no. 2, pp. 179-184.Russia, YakutiaDeposit - Udachnaya
DS201412-0721
2014
Pokhilenko, N.P.Rakhmanova, M.I., Nadolinny, V.A., Yuryeva, O.P., Pokhilenko, N.P.Pecularities of nitrogen impurity aggregation in diamonds from the Sytykanskaya pipe, Yakutia.European Journal of Mineralogy, Vol. 27, 1, pp. 51-56.Russia, YakutiaDeposit - Sytykanskaya
DS201412-0797
2013
Pokhilenko, N.P.Sharygin, I.S., Golovin, A.V., Korsakov, A.V., Pokhilenko, N.P.Eitelite in sheared peridotite xenoliths from Udachnaya-East kimberlite pipe ( Russia) - a new locality and host rock type.European Journal of Mineralogy, Vol. 25, pp. 825-834.Russia, YakutiaDeposit - Udachnaya
DS201412-0798
2014
Pokhilenko, N.P.Sharygin, I.S., Litasov, K.D., Shatskiy, A., Golovin, A.V., Ohtani, E., Pokhilenko, N.P.Melting phase relations of the Udachnaya-East Group 1 kimberlite at 3.0-6.5GPa: experimental evidence for alkali-carbonatite composition of primary kimberlite melts and implications for mantle plumes.Gondwana Research, in press availableRussiaDeposit - Udachnaya-East
DS201412-0937
2014
Pokhilenko, N.P.Tychkov, N.S., Agashev, A.M., Malygina, E.V., Nikolenko, E.I., Pokhilenko, N.P.Thermal pertubations in the lithospheric mantle as evidenced from P-T equilibrium conditions of xenoliths from the Udachnaya kimberlite pipe.Doklady Earth Sciences, Vol. 454, 1, pp. 84-88.Russia, YakutiaDeposit - Udachnaya
DS201412-0952
2014
Pokhilenko, N.P.Vladykin, N.V., Kotov, A.B., Borisenko, A.S., Yarmolyuk, V.V., Pokhilenko, N.P., Salnikova, E.B., Travin, A.V., Yakovleva, S.Z.Age boundaries of formation of the Tomtor alkaline ultramafic pluton: U Pb and 40 Ar 39 Ar geochronological studies.Doklady Earth Sciences, Vol. 454, 1, pp. 7-11.RussiaGeochronology
DS201412-1013
2014
Pokhilenko, N.P.Yudin, D.S., Tomilenko, A.A., Travin, A.V., Agashev, A.M., Pokhilenko, N.P., Orihashi, yu.The age of the Udachnaya-East kimberlite: U/Pb and 40 Ar/39Ar data.Doklady Earth Sciences, Vol. 455, 1, pp. 288-290.RussiaDeposit - Udachnaya
DS201503-0170
2015
Pokhilenko, N.P.Rakhmanova, M.I., Nadolinny, V.A., Yuryeva, O.P., Pokhilenko, N.P., Logvinova, A.M.Pecularities of nitrogen impurity aggregation in diamonds from the Sytykanskaya pipe, Yakutia.European Journal of Mineralogy, Vol. 27, pp. 51-56.Russia, YakutiaDeposit - Sytykanskaya
DS201504-0183
2015
Pokhilenko, N.P.Barry, P.H., Hilton, D.R., Day, J.M.D., Pernet-Fisher, J.F., Howarth, G.H., Magna, T., Agashev, A.M., Pokhilenko, N.P., Opkhilenko, L.N., Taylor, L.A.Helium isotope evidence for modification of the cratonic lithosphere during the Permo-Triassic Siberian flood basalt event.Lithos, Vol. 216-217, pp. 73-80.Russia, SiberiaDeposit - Udachnaya, Obnazhennaya

Abstract: Major flood basalt emplacement events can dramatically alter the composition of the sub-continental lithospheric mantle (SCLM). The Siberian craton experienced one of the largest flood basalt events preserved in the geologic record — eruption of the Permo-Triassic Siberian flood basalts (SFB) at ~250 Myr in response to upwelling of a deep-rooted mantle plume beneath the Siberian SCLM. Here, we present helium isotope (3 He/ 4 He) and concentra-tion data for petrologically-distinct suites of peridotitic xenoliths recovered from two temporally-separated kim-berlites: the 360 Ma Udachnaya and 160 Ma Obnazhennaya pipes, which erupted through the Siberian SCLM and bracket the eruption of the SFB. Measured 3 He/ 4 He ratios span a range from 0.1 to 9.8 R A (where R A = air 3 He/ 4 He) and fall into two distinct groups: 1) predominantly radiogenic pre-plume Udachnaya samples (mean clinopyroxene 3 He/ 4 He = 0.41 ± 0.30 R A (1s); n = 7 excluding 1 outlier), and 2) 'mantle-like' post plume Obnazhennaya samples (mean clinopyroxene 3 He/ 4 He = 4.20 ± 0.90 R A (1s); n = 5 excluding 1 outlier). Olivine separates from both kimberlite pipes tend to have higher 3 He/ 4 He than clinopyroxenes (or garnet). Helium con-tents in Udachnaya samples ([He] = 0.13–1.35 µcm 3 STP/g; n = 6) overlap with those of Obnazhennaya ([He] = 0.05–1.58 µcm 3 STP/g; n = 10), but extend to significantly higher values in some instances ([He] = 49– 349 µcm 3 STP/g; n = 4). Uranium and thorium contents are also reported for the crushed material from which He was extracted in order to evaluate the potential for He migration from the mineral matrix to fluid inclusions. The wide range in He content, together with consistently radiogenic He-isotope values in Udachnaya peridotites suggests that crustal-derived fluids have incongruently metasomatized segments of the Siberian SCLM, whereas high 3 He/ 4 He values in Obnazhennaya peridotites show that this section of the SCLM has been overprinted by Permo-Triassic (plume-derived) basaltic fluids. Indeed, the stark contrast between pre-and post-plume 3 He/ 4 He ra-tios in peridotite xenoliths highlights the potentially powerful utility of He-isotopes for differentiating between various types of metasomatism (i.e., crustal versus basaltic fluids).
DS201506-0301
2015
Pokhilenko, N.P.Zedgenizov, D.A., Pokhilenko, N.P., Griffin, W.L.Carbonate- silicate composition of diamond forming media of fibrous diamonds from Snap Lake area, Canada.Doklady Earth Sciences, Vol. 461, 1, pp. 297-300.Canada, Northwest TerritoriesMicro-inclusions
DS201507-0336
2015
Pokhilenko, N.P.Shchukina, E.V., Agashev, A.M., Golovin, N.N., Pokhilenko, N.P.Equigranualr eclogites from the V. Grib kimberlite pipe: evidence for Paleoproterozoic subduction on the territory of the Arkangelsk Diamondiferous province.Doklady Earth Sciences, Vol. 462, 1, pp. 497-501.Russia, Archangel, Kola PeninsulaDeposit - Grib
DS201508-0347
2015
Pokhilenko, N.P.Chepurov, A.A., Pokhilenko, N.P.Experimental estimation of the kimberlite melt velosity. ( Nyurbinskaya mentioned)Doklady Earth Sciences, Vol. 462, 2, pp. 592-595.TechnologyPetrology - geodynamic model
DS201602-0237
2015
Pokhilenko, N.P.Shchukina, E.V., Agashev, A.M., Kostrovitsky, S.I., Pokhilenko, N.P.Metasomatic processes in the lithospheric mantle beneath the V. Grib kimberlite pipe ( Arkangelsk Diamondiferous province, Russia).Russian Geology and Geophysics, Vol. 56, pp. 1701-1716.RussiaDeposit - Grib

Abstract: New data on metasomatic processes in the lithospheric mantle in the central part of the Arkhangelsk diamondiferous province (ADP) are presented. We studied the major- and trace-element compositions of minerals of 26 garnet peridotite xenoliths from the V. Grib kimberlite pipe; 17 xenoliths contained phlogopite. Detailed mineralogical, petrographic, and geochemical studies of peridotite minerals (garnet, clinopyroxene, and phlogopite) have revealed two types of modal metasomatic enrichment of the lithospheric-mantle rocks: high temperature (melt) and low-temperature (phlogopite). Both types of modal metasomatism significantly changed the chemical composition of the peridotites. Low-temperature modal metasomatism manifests itself as coarse tabular and shapeless phlogopite grains. Two textural varieties of phlogopite show significant differences in chemical composition, primarily in the contents of TiO2, Cr2O3, FeO, Ba, Rb, and Cs. The rock-forming minerals of phlogopite-bearing peridotites differ in chemical composition from phlogopite-free peridotites, mainly in higher FeO content. Most garnets and clinopyroxenes in peridotites are the products of high-temperature mantle metasomatism, as indicated by the high contents of incompatible elements and REE pattern in these minerals. Fractional-crystallization modeling gives an insight into the nature of melts (metasomatic agents). They are close in composition to picrites of the Izhmozero field, basalts of the Tur’ino field, and carbonatites of the Mela field of the ADP. The REE patterns of the peridotite minerals make it possible to determine the sequence of metasomatic enrichment of the lithospheric mantle beneath the V. Grib kimberlite pipe.
DS201604-0625
2015
Pokhilenko, N.P.Sharygin, I.S., Litasov, K.D., Shatskiy, A., Golovin, A.V., Ohtani, E., Pokhilenko, N.P.Melting phase relations of the Udachnaya-East group 1 kimberlite at 3.0-6.5 Gpa: experimental evidence for alkali- carbonatite composition of primary kimberlite melts and implications for mantle plumes.Gondwana Research, Vol. 28, pp. 1391-1414.RussiaDeposit - Udachnaya -East

Abstract: Experiments on the origin of the Udachnaya-East kimberlite (UEK) have been performed using a Kawai-type multianvil apparatus at 3-6.5GPa and 900-1500°C. The studied composition represents exceptionally fresh Group-I kimberlite containing (wt.%): SiO2=25.9, TiO2=1.8, Al2O3=2.8, FeO=9.0, MgO=30.1, CaO=12.7, Na2O=3.4, K2O=1.3, P2O5=1.0, Cl=0.9, CO2=9.9, and H2O=0.5. The super-solidus assemblage consists of melt, olivine (Ol), Ca-rich (26.0-30.2wt.% CaO) garnet (Gt), Al-spinel (Sp), perovskite (Pv), a CaCO3 phase (calcite or aragonite), and apatite. The low pressure assemblage (3-4GPa) also includes clinopyroxene. The apparent solidus was established between 900 and 1000°C at 6.5GPa. At 6.5GPa and 900°C Na-Ca carbonate with molar ratio of (Na+K)/Ca˜0.44 was observed. The UEK did not achieve complete melting even at 1500°C and 6.5GPa, due to excess xenogenic Ol in the starting material. In the studied P-T range, the melt has a Ca-carbonatite composition (Ca#=molar Ca/(Ca+Mg) ratio=0.62-0.84) with high alkali and Cl contents (7.3-11.4wt.% Na2O, 2.8-6.7wt.% K2O, 1.6-3.4wt.% Cl). The K, Na and Cl contents and Ca# decrease with temperature. It is argued that the primary kimberlite melt at depths>200km was an essentially carbonatitic (<5wt.% SiO2), but evolved toward a carbonate-silicate composition (up to 15-20wt.% SiO2) during ascent. The absence of orthopyroxene among the run products indicates that xenogenic orthopyroxene was preferentially dissolved into the kimberlite melt. The obtained subliquidus phase assemblage (Ol+Sp+Pv+Ca-rich Gt) at P-T conditions of the UEK source region, i.e. where melt was in the last equilibrium with source rock before magma ascent, differs from the Opx-bearing peridotitic mineral assemblage of the UEK source region. This difference can be ascribed to the loss of substantial amounts of CO2 from the kimberlite magma at shallow depths, as indicated by both petrological and experimental data. Our study implies that alkali-carbonatite melt would be a liquid phase within mantle plumes generated at the core-mantle boundary or shallower levels of the mantle, enhancing the ascent velocity of the plumes. We conclude that the long-term activity of a rising hot mantle plume and associated carbonatite melt (i.e. kimberlite melt) causes thermo-mechanical erosion of the subcontinental lithosphere mantle (SCLM) roots and creates hot and deformed metasomatic regions in the lower parts of the SCLM, which corresponds to depths constrained by P-T estimates of sheared Gt-peridotite xenoliths. The sheared Gt-peridotites undoubtedly represent samples of these regions.
DS201605-0887
2016
Pokhilenko, N.P.Rezvukhin, D.I., Malkovets, V.G., Sharygin, I.S., Kuzmin, D.V., Litasov, K.D., Gibsher, A.A., Pokhilenko, N.P., Sobolev, N.V.Inclusions of Cr- and Cr-Nb-Rutile in pyropes from the Internationalnaya kimberlite pipe, Yakutia.Doklady Earth Sciences, Vol. 466, 2, Feb. pp. 173-176.Russia, YakutiaDeposit - International

Abstract: The results of study of rutile inclusions in pyrope from the Internatsionalnaya kimberlite pipe are presented. Rutile is characterized by unusually high contents of impurities (up to 25 wt %). The presence of Cr2O3 (up to 9.75 wt %) and Nb2O5 (up to 15.57 wt %) are most typical. Rutile inclusions often occur in assemblage with Ti-rich oxides: picroilmenite and crichtonite group minerals. The Cr-pyropes with inclusions of rutile, picroilmenite, and crichtonite group minerals were formed in the lithospheric mantle beneath the Mirnyi field during their joint crystallization from melts enriched in Fe, Ti, and other incompatible elements as a result of metasomatic enrichment of the depleted lithospheric mantle.
DS201605-0888
2016
Pokhilenko, N.P.Rezvukhin, D.I., Malkovets, V.G., Sharygin, I.S., Kuzmin, D.V., Litasov, K.D., Gibsher, A.A., Pokhilenko, N.P., Sobolev, N.V.Inclusions of crichonite group minerals in pyropes from the Internatsionalnaya kimberlite pipe, Yakutia.Doklady Earth Sciences, Vol. 466, 2, Feb. pp. 206-209.Russia, YakutiaDeposit - International
DS201606-1111
2016
Pokhilenko, N.P.Samdanov, D.A., Afanasiev, V.P., Tychkov, N.S., Pokhilenko, N.P.Mineralogical zoning of the Diamondiferous areas: application experience of paragenetic analysis of garnets from kimberlites.Doklady Earth Sciences, Vol. 467, 1, pp. 228-231.Russia, YakutiaDeposit area - Muna-Markha

Abstract: Paragenetic analysis of pyropes from alluvial deposits of the Muna—Markha interfluve (Sakha-Yakutia Republic) made it possible to distinguish relatively uniform areas that are promising for the discovery of kimberlite bodies.
DS201606-1115
2016
Pokhilenko, N.P.Sharygin, I.S., Golovin, A.V., Korsakov, A.V., Pokhilenko, N.P.Tychite in mantle xenoliths from kimberlites: the first find of a new genetic type.Doklady Earth Sciences, Vol. 467, 1, pp. 270-274.Russia, YakutiaDeposit -Udachnaya East

Abstract: Tychite Na6Mg2(CO3)4(SO3) is a rare natural Na and Mg sulfatocarbonate. It is found only as minor mineral in deposits of saline lakes in the United States, Canada, Uganda, and China. In these continental evaporites tychite has sedimentary genesis. In this study, we report the first occurrence of tychite as a crystal phase in the melt inclusions in olivine from mantle xenoliths of the Udachnaya-East kimberlite pipe. This find provides an evidence for the probability of tychite crystallization from melts; i.e., this rare sulfatocarbonate may have a magmatic origin as well.
DS201608-1452
2016
Pokhilenko, N.P.Yudin, D.S., Tomilanko, A.A., Alifirova, T.A., Travin, A.V., Murzintsev, N.G., Pokhilenko, N.P.Results of 40 Ar/39 Ar dating of phlogopites from kelphyphitic rims around garnet grains ( Udachnaya- Vostochnaya pipe).Doklady Earth Sciences, Vol. 469, 1, pp. 728-731.RussiaDeposit - Udachnaya - Vostochnaya
DS201610-1886
2016
Pokhilenko, N.P.Melkovets, V.G., Rezvukhin, D.I., Belousova, E.A., Griffin, W.L., Sharygin, I.S., Tretiakova, I.G., Pokhilenko, N.P., Sobolev, N.V.Cr-rich rutile: a powerful tool for diamond exploration.Lithos, in press available 8p.Russia, SiberiaDeposit - Internationalnaya

Abstract: Mineralogical studies and U-Pb dating have been carried out on rutile included in peridotitic and eclogitic garnets from the Internatsionalnaya pipe, Mirny field, Siberian craton. We also describe a unique peridotitic paragenesis (rutile + forsterite + enstatite + Cr-diopside + Cr-pyrope) preserved in diamond from the Mir pipe, Mirny field. Compositions of rutile from the heavy mineral concentrates of the Internatsionalnaya pipe and rutile inclusions in crustal almandine-rich garnets from the Mayskaya pipe (Nakyn field), as well as from a range of different lithologies, are presented for comparison. Rutile from cratonic mantle peridotites shows characteristic enrichment in Cr, in contrast to lower-Cr rutile from crustal rocks and off-craton mantle. Rutile with Cr2O3 > 1.7 wt% is commonly derived from cratonic mantle, while rutiles with lower Cr2O3 may be both of cratonic and off-cratonic origin. New analytical developments and availability of standards have made rutile accessible to in situ U-Pb dating by laser ablation ICP-MS. A U-Pb age of 369 ± 10 Ma for 9 rutile grains in 7 garnets from the Internatsionalnaya pipe is consistent with the accepted eruption age of the pipe (360 Ma). The equilibrium temperatures of pyropes with rutile inclusions calculated using Ni-in-Gar thermometer range between ~ 725 and 1030 °C, corresponding to a depth range of ca ~ 100-165 km. At the time of entrainment in the kimberlite, garnets with Cr-rich rutile inclusions resided at temperatures well above the closure temperature for Pb in rutile, and thus U-Pb ages on mantle-derived rutile most likely record the emplacement age of the kimberlites. The synthesis of distinctive rutile compositions and U-Pb dating opens new perspectives for using rutile in diamond exploration in cratonic areas.
DS201611-2139
2016
Pokhilenko, N.P.Sharygin, I.S., Litasov, K.D., Shatskiy, A., Safonov, O.G., Golovin, A.V., Ohtani, E., Pokhilenko, N.P.Experimental constraints on orthopyroxene dissolution in alkali carbonate melts in the lithospheric mantle: implications for kimberlite melt composition and magma ascent.Chemical Geology, in press available 42p.TechnologyMagma melting

Abstract: Although kimberlite magma carries large amounts of mantle-derived xenocrysts and xenoliths (with sizes up to meters), this magma ascends from the Earth's mantle (> 150-250 km) to the surface in a matter of hours or days, which enables diamonds to survive. The recently proposed assimilation-fuelled buoyancy model for kimberlite magma ascent emphasizes the importance of fluid CO2 that is produced via the reactive dissolution of mantle-derived orthopyroxene xenocrysts into kimberlite melt, which initially has carbonatitic composition. Here, we use a series of high-pressure experiments to test this model by studying the interaction of orthopyroxene (Opx) with an alkali-dolomitic melt (simplified to 0.7Na2CO3 + 0.3K2CO3 + 2CaMg(CO3)2), which is close to the melt that is produced by the partial melting of a kimberlite source, at P = 3.1-6.5 GPa and T = 1200-1600 °C, i.e., up to pressures that correspond to depths (~ 200 km) from where the ascent of kimberlite magma would start. During the first set of experiments, we study the reaction between powdered Opx and model carbonate melt in a homogeneous mixture. During the second set of experiments, we investigate the mechanism and kinetics of the dissolution of Opx crystals in alkali-dolomitic melt. Depending on the P-T conditions, Opx dissolves in the alkali-dolomitic melt (CL) either congruently or incongruently via the following reactions: Mg2Si2O6 (Opx) + CaMg(CO3)2 (CL) = CaMgSi2O6 (clinopyroxene) + 2MgCO3 (CL) and Mg2Si2O6 (Opx) = Mg2SiO4 (olivine) + SiO2 (CL). The experiments confirm that the dissolution of Opx causes gradual SiO2 enrichment in the initial carbonate melt, as previously suggested. However, the assimilation of Opx by carbonate melt does not produce fluid CO2 in the experiments because the CO2 is totally dissolved in the evolved melt. Thus, our results clearly demonstrate the absence of exsolved CO2 fluid at 3.1-6.5 GPa in ascending kimberlite magma and disprove the assimilation-fuelled buoyancy model for kimberlite magma ascent in the lithospheric mantle. We alternatively suggest that the extreme buoyancy of kimberlite magma at depths of 100-250 km is an exclusive consequence of the unique physical properties (i.e., low density, ultra-low viscosity and, thus, high mobility) of the kimberlite melt, which are dictated by its carbonatitic composition.
DS201612-2297
2016
Pokhilenko, N.P.Egorova, E.O., Afanasev, V.P., Pokhilenko, N.P.Middle Paleozoic kimberlite magmatism in the northeastern Siberia.Doklady Earth Sciences, Vol. 470, 2, pp. 1023-1026.Russia, SiberiaDeposit - Billyakh River placers

Abstract: The mineral chemistry and crystal morphology of kimberlite pyropes from the Billyakh River placer in the northeastern Siberian craton are characterised in terms of the placer history. The pyropes bear signatures of chemical weathering (dissolution), presumably in a Middle Paleozoic laterite profile, and therefore were originally hosted by Middle Paleozoic kimberlites. The broad occurrence of placer pyropes with lateritic dissolution signatures points to the presence of Middle Paleozoic diamond-bearing kimberlites in the study area.
DS201612-2320
2016
Pokhilenko, N.P.Malkovets, V.G., Rezvukhin, D.I., Belousova, E.A., Griffin, W.L., Sharygin, I.S., Tretiakov, I.G., Gibsher, A.A., O'Reilly, S.Y., Kuzmin, D.V., Litasov, K.D., Logvinova, A.M., Pokhilenko, N.P., Sobolev, N.V.Cr-rich rutile: a powerful tool for diamond exploration.Lithos, Vol. 265, pp. 304-311.Russia, SiberiaDeposit - Internationalskaya

Abstract: Mineralogical studies and U-Pb dating have been carried out on rutile included in peridotitic and eclogitic garnets from the Internatsionalnaya pipe, Mirny field, Siberian craton. We also describe a unique peridotitic paragenesis (rutile + forsterite + enstatite + Cr-diopside + Cr-pyrope) preserved in diamond from the Mir pipe, Mirny field. Compositions of rutile from the heavy mineral concentrates of the Internatsionalnaya pipe and rutile inclusions in crustal almandine-rich garnets from the Mayskaya pipe (Nakyn field), as well as from a range of different lithologies, are presented for comparison. Rutile from cratonic mantle peridotites shows characteristic enrichment in Cr, in contrast to lower-Cr rutile from crustal rocks and off-craton mantle. Rutile with Cr2O3 > 1.7 wt% is commonly derived from cratonic mantle, while rutiles with lower Cr2O3 may be both of cratonic and off-cratonic origin. New analytical developments and availability of standards have made rutile accessible to in situ U-Pb dating by laser ablation ICP-MS. A U-Pb age of 369 ± 10 Ma for 9 rutile grains in 6 garnets from the Internatsionalnaya pipe is consistent with the accepted eruption age of the pipe (360 Ma). The equilibrium temperatures of pyropes with rutile inclusions calculated using Ni-in-Gar thermometer range between ~ 725 and 1030 °C, corresponding to a depth range of ca ~ 100-165 km. At the time of entrainment in the kimberlite, garnets with Cr-rich rutile inclusions resided at temperatures well above the closure temperature for Pb in rutile, and thus U-Pb ages on mantle-derived rutile most likely record the emplacement age of the kimberlites. The synthesis of distinctive rutile compositions and U-Pb dating opens new perspectives for using rutile in diamond exploration in cratonic areas.
DS201612-2336
2016
Pokhilenko, N.P.Shchukina, E.V., Agashev, A.M., Pokhilenko, N.P.Metasomatic origin of garnet xenocrysts from the V. Grib kimberlite pipe, Arkhangelsk region, NW Russia.Geoscience Frontiers, in press availableRussia, Archangel, Kola PeninsulaDeposit - Grib

Abstract: This paper presents new major and trace element data from 150 garnet xenocrysts from the V. Grib kimberlite pipe located in the central part of the Arkhangelsk diamondiferous province (ADP). Based on the concentrations of Cr2O3, CaO, TiO2 and rare earth elements (REE) the garnets were divided into seven groups: (1) lherzolitic “depleted” garnets (“Lz 1”), (2) lherzolitic garnets with normal REE patterns (“Lz 2”), (3) lherzolitic garnets with weakly sinusoidal REE patterns (“Lz 3”), (4) lherzolitic garnets with strongly sinusoidal REE patterns (“Lz 4”), (5) harzburgitic garnets with sinusoidal REE patterns (“Hz”), (6) wehrlitic garnets with weakly sinusoidal REE patterns (“W”), (7) garnets of megacryst paragenesis with normal REE patterns (“Meg”). Detailed mineralogical and geochemical garnet studies and modeling results suggest several stages of mantle metasomatism influenced by carbonatite and silicate melts. Carbonatitic metasomatism at the first stage resulted in refertilization of the lithospheric mantle, which is evidenced by a nearly vertical CaO-Cr2O3 trend from harzburgitic (“Hz”) to lherzolitic (“Lz 4”) garnet composition. Harzburgitic garnets (“Hz”) have probably been formed by interactions between carbonatite melts and exsolved garnets in high-degree melt extraction residues. At the second stage of metasomatism, garnets with weakly sinusoidal REE patterns (“Lz 3”, “W”) were affected by a silicate melt possessing a REE composition similar to that of ADP alkaline mica-poor picrites. At the last stage, the garnets interacted with basaltic melts, which resulted in the decrease CaO-Cr2O3 trend of “Lz 2” garnet composition. Cr-poor garnets of megacryst paragenesis (“Meg”) could crystallize directly from the silicate melt which has a REE composition close to that of ADP alkaline mica-poor picrites. P-T estimates of the garnet xenocrysts indicate that the interval of ~60-110 km of the lithospheric mantle beneath the V. Grib pipe was predominantly affected by the silicate melts, whereas the lithospheric mantle deeper than 150 km was influenced by the carbonatite melts.
DS201701-0034
2016
Pokhilenko, N.P.Surgutanova, E.A., Agashev, A.M., Demonterova, E.I., Golovin, A.V., Pokhilenko, N.P.Sr and Nd isotope composition of deformed peridotite xenoliths from Udachnaya kimberlite pipe.Doklady Earth Sciences, Vol. 471, 1, pp. 1104-1207.RussiaDeposit - Udachnaya

Abstract: New results of Rb-Sr and Sm-Nd isotope analyses have been obtained on samples of deformed peridotite xenoliths collected from the Udachnaya kimberlite pipe (Yakutia). The data obtained imply two main stages of metasomatic alteration of the lithospheric mantle base matter in the central part of the Siberian Craton. Elevated ratios of Sr isotopes may be considered as evidence of an ancient stage of metasomatic enrichment by a carbonatite melt. The acquired Nd isotope composition together with the geochemistry of the deformed peridotite xenoliths suggests that the second stage of metasomatic alteration took place shortly before formation of the kimberlite melt. The metasomatic agent of this stage had a silicate character and arrived from an asthenosphere source, common for the normal OIB type (PREMA) and the Group-I kimberlite.
DS201702-0258
2016
Pokhilenko, N.P.Zhimulev, E.I., Sonin, V.M., Afanasiev, V.P., Chepuov, A.I., Pokhilenko, N.P.Fe-S melt as a likely solvent of diamond under mantle conditions.Doklady Earth Sciences, Vol. 471, 2, pp. 1277-1279.MantleDiamond morphology

Abstract: The first results of experimental study of diamond dissolution in a S-bearing Fe melt at high P-T parameters are reported and the morphology of partially dissolved crystals is compared with that of natural diamonds. Our results show that under the experimental conditions (4 GPa, 1400°C), flat-faced octahedral diamond crystals are transformed into curve-faced octahedroids with morphological features similar to those of natural diamonds.
DS201705-0892
2017
Pokhilenko, N.P.Zhimulev, E.I., Sonin, V.M., Afanasiev, V.P., Chepurov, A.I., Pokhilenko, N.P.Fe-S melt as a likely solvent of diamond under mantle conditions.Doklady Earth Sciences, Vol. 471, 2, pp. 1277-1279.MantleDiamond morphology

Abstract: The first results of experimental study of diamond dissolution in a S-bearing Fe melt at high P-T parameters are reported and the morphology of partially dissolved crystals is compared with that of natural diamonds. Our results show that under the experimental conditions (4 GPa, 1400°C), flat-faced octahedral diamond crystals are transformed into curve-faced octahedroids with morphological features similar to those of natural diamonds.
DS201707-1336
2017
Pokhilenko, N.P.Ivanova, O.A., Logvinova, A.M., Pokhilenko, N.P.Inclusions in diamonds from Snap Lake kimberlites ( Slave craton, Canada): geochemical features of crystallization.Doklady Earth Sciences, Vol. 474, 1, pp. 490-493.Canada, Northwest Territoriesdeposit - Snap Lake

Abstract: The results of integrated studies of inclusion-containing diamonds from kimberlites of the Snap Lake dike complex (Canada) are presented. Features of the morphology, defect–impurity composition, and internal structure of the diamonds were determined by optic and scanning microscopy. The chemical composition of crystalline inclusions (olivine, garnet, and pyroxene) in diamonds was studied using a microanalyzer with an electronic probe. The inclusions of ultramafic paragenesis in the diamond (87%) are predominant. Carbonates, sulfide and hydrated silicate phases were found only in multiphase microinclusions. The large phlogopite inclusion studied was similar in composition to earlier studied nanosize inclusions of high-silica mica in diamonds from Snap Lake kimberlites. Revealed features of studied diamonds and presence of high-silica mica suggest that diamonds from Snap Lake have formed as the result of interaction between enriched in volatile and titanium high-potassium carbonate–silicate melts and peridotitic substrate at the base of thick lithospheric mantle.
DS201707-1364
2017
Pokhilenko, N.P.Sharygin, I.S., Litasov, K.D., Shatskiy, A., Safonov, O.G., Golovin, A.V., Ohtani, E., Pokhilenko, N.P.Experimental constraints on orthopyroxene dissolution in alkali-carbonate melts in the lithospheric mantle: implications for kimberlite melt composition and magma ascent.Chemical Geology, Vol. 455, pp. 44-56.Mantlekimberlite, carbonatite

Abstract: Although kimberlite magma carries large amounts of mantle-derived xenocrysts and xenoliths (with sizes up to meters), this magma ascends from the Earth's mantle (> 150–250 km) to the surface in a matter of hours or days, which enables diamonds to survive. The recently proposed assimilation-fuelled buoyancy model for kimberlite magma ascent emphasizes the importance of fluid CO2 that is produced via the reactive dissolution of mantle-derived orthopyroxene xenocrysts into kimberlite melt, which initially has carbonatitic composition. Here, we use a series of high-pressure experiments to test this model by studying the interaction of orthopyroxene (Opx) with an alkali-dolomitic melt (simplified to 0.7Na2CO3 + 0.3K2CO3 + 2CaMg(CO3)2), which is close to the melt that is produced by the partial melting of a kimberlite source, at P = 3.1–6.5 GPa and T = 1200–1600 °C, i.e., up to pressures that correspond to depths (~ 200 km) from where the ascent of kimberlite magma would start. During the first set of experiments, we study the reaction between powdered Opx and model carbonate melt in a homogeneous mixture. During the second set of experiments, we investigate the mechanism and kinetics of the dissolution of Opx crystals in alkali-dolomitic melt. Depending on the P-T conditions, Opx dissolves in the alkali-dolomitic melt (CL) either congruently or incongruently via the following reactions: Mg2Si2O6 (Opx) + CaMg(CO3)2 (CL) = CaMgSi2O6 (clinopyroxene) + 2MgCO3 (CL) and Mg2Si2O6 (Opx) = Mg2SiO4 (olivine) + SiO2 (CL). The experiments confirm that the dissolution of Opx causes gradual SiO2 enrichment in the initial carbonate melt, as previously suggested. However, the assimilation of Opx by carbonate melt does not produce fluid CO2 in the experiments because the CO2 is totally dissolved in the evolved melt. Thus, our results clearly demonstrate the absence of exsolved CO2 fluid at 3.1–6.5 GPa in ascending kimberlite magma and disprove the assimilation-fuelled buoyancy model for kimberlite magma ascent in the lithospheric mantle. We alternatively suggest that the extreme buoyancy of kimberlite magma at depths of 100–250 km is an exclusive consequence of the unique physical properties (i.e., low density, ultra-low viscosity and, thus, high mobility) of the kimberlite melt, which are dictated by its carbonatitic composition.
DS201709-2001
2017
Pokhilenko, N.P.Ivanov, O.A., Logvinova, A.M., Pokhilenko, N.P.Characteristics of nitrogen impurity in octahedral diamonds from Snap Lake ( Slave craton, Canada).Goldschmidt Conference, abstract 1p.Canada, Northwest Territoriesdeposit - Snap Lake

Abstract: The nitrogen concentration and aggregation form reflect the conditions of diamond formation and diamond evolution in primary source [1]. FTIR measurements were made on 40 colorless or slightly greenish octahedral diamonds from Snap Lake kimberlite dyke system. Studied diamonds differ in nitrogen content, distribution and aggregation degree. The total nitrogen content in different diamond zones is up to 1600 ppm. Diamonds have been classified into two groups on the basis of nitrogen aggregation degree in them. Group 1 includes poorly-aggregated-nitrogen diamonds. We suggest that such diamonds belong to the same generation such as cubic diamonds from Snap Lake [2]. The low degree of nitrogen aggregation in diamonds is indicative of short mantle residence and suggests that they crystallized shortly before kimberlite eruption. Diamonds of Group 2 are characterized by high nitrogen aggregation degree (up to 98.6%). Group 2 includes diamonds either with uniform nitrogen distribution throughout the crystal volume or with a predominance of Bdefect in the center. Inhomogeneity in nitrogen distribution from the center to the edge of the octahedral crystals indicates, at least, about the two, or even more growth stages of a part of the studied diamonds. High nitrogen aggregation degree according to “annealing” model is evidence of diamond staying in the high temperature region or of their residence in the mantle conditions. Results obtained support that significant part of octahedral diamonds from Snap Lake may have formed at the base of a thick lithospheric mantle at depth below 300 km [3].
DS201802-0269
2017
Pokhilenko, N.P.Tomshin, M.D., Pokhilenko, N.P., Tarskikh, E.V.Morphology of the Nyurba kimberlite pipe and its relationship with the dolerite dike.Doklady Earth Sciences, Vol. 477, 2, pp. 1458-1460.Russiadeposit - Nyturba

Abstract: Study of the magmatics in the Nakyn kimberlite field, with consideration of the isotope dating results, allowed us to establish a sequence of their formation. First, 368.5-374.4 Ma ago intrusions of the Vilyui-Markha dike belt formed. Then (363-364 Ma) intrusion of kimberlites took place. In the Early Carboniferous (338.2-345.6 Ma), alkaline basaltic magma intruded through faults controlling the kimberlites. The magmatic activity finished 331-324.9 Ma ago with the formation of explosive breccias. It has been found that the Nyurba kimberlite pipe consists of two bodies: their kimberlite melts have successively intruded through independent channels.
DS201804-0734
2018
Pokhilenko, N.P.Sharygin, I.S., Shatskiy, A., Litasov, K.D., Golovin, A.V., Ohtani, E., Pokhilenko, N.P.Interaction of peridotite with Ca-rich carbonatite melt at 3.1 and 6.5 Gpa: implications for merwinite formation in upper mantle, and for metasomatic origin of sublithospheric diamonds with Ca rich suite of inclusions.Contribution to Mineralogy and Petrology, Vol. 173, 22p.Mantlecarbonatite

Abstract: We performed an experimental study, designed to reproduce the formation of an unusual merwinite?+?olivine-bearing mantle assemblage recently described as a part of a Ca-rich suite of inclusions in sublithospheric diamonds, through the interaction of peridotite with an alkali-rich Ca-carbonatite melt, derived from deeply subducted oceanic crust. In the first set of experiments, we studied the reaction between powdered Mg-silicates, olivine and orthopyroxene, and a model Ca-carbonate melt (molar Na:K:Ca?=?1:1:2), in a homogeneous mixture, at 3.1 and 6.5 GPa. In these equilibration experiments, we observed the formation of a merwinite?+?olivine-bearing assemblage at 3.1 GPa and 1200 °C and at 6.5 GPa and 1300-1400 °C. The melts coexisting with this assemblage have a low Si and high Ca content (Ca#?=?molar 100?×?Ca/(Ca?+?Mg)?>?0.57). In the second set of experiments, we investigated reaction rims produced by interaction of the same Ca-carbonate melt (molar Na:K:Ca?=?1:1:2) with Mg-silicate, olivine and orthopyroxene, single crystals at 3.1 GPa and 1300 °C and at 6.5 GPa and 1400 °C. The interaction of the Ca-carbonate melt with olivine leads to merwinite formation through the expected reaction: 2Mg2SiO4 (olivine)?+?6CaCO3 (liquid)?=?Ca3MgSi2O8 (merwinite)?+?3CaMg(CO3)2 (liquid). Thus, our experiments confirm the idea that merwinite in the upper mantle may originate via interaction of peridotite with Ca-rich carbonatite melt, and that diamonds hosting merwinite may have a metasomatic origin. It is remarkable that the interaction of the Ca-carbonate melt with orthopyroxene crystals does not produce merwinite both at 3.1 and 6.5 GPa. This indicates that olivine grain boundaries are preferable for merwinite formation in the upper mantle.
DS201807-1477
2018
Pokhilenko, N.P.Agashev, A.M., Pokhilenko, L.N., Pokhilenko, N.P., Shchukina, E.V.Geochemistry of eclogite xenoliths from the Udachnaya kimberlite pipe: section of ancient oceanic crust sampled.Lithos, DOI:10.1016 /j.lithos.2018 .05.027 available 52p.Russiadeposit - Udachnaya

Abstract: A suite of seventeen unique, large, and fresh eclogite xenoliths from the Udachnaya pipe have been studied for their whole-rock and mineral major- and trace-element compositions. Based on their major-element compositions, the Udachnaya eclogites can be subdivided in two groups: high magnesian (Mg# 68.8-81.9) and low magnesian (Mg# 56.8-59). The two eclogite groups are clearly different in the style of correlation between major elements. Positive correlations of FeO and CaO with MgO are observed in the low-magnesian group, whereas these correlations are negative in the high-magnesian group. In terms of trace element composition, the Udachnaya eclogites are enriched over Primitive Mantle, but comparable to mid-ocean-ridge basalt composition, except for significant enrichment in large-ion lithophile elements (LILE; Rb, Ba, K, Sr). Most of the samples show a positive Eu anomaly, irrespective of group. Reconstructed whole-rock composition from clinopyroxene and garnet modal abundances contains much less incompatible elements (LILE, light rare earth elements, high field strength elements) than measured composition. Approximately 60 to 100% of the middle rare earth elements, Zr, and Hf, and nearly 100% of the heavy rare earth elements, Co, V, and Sc of the whole-rock budget are concentrated in Gar and Cpx. Variations in major element compositions cover a full section of the modern and Archaean oceanic crust, from troctolite, through gabbroic rocks, to basalts. The low-Mg# eclogites could have formed from upper oceanic crust protoliths, being a mixture of basalts and gabbro, whereas the high-Mg# eclogites are originated from gabbro-troctolite section of the lower oceanic crust. Concordant variations of Eu anomaly with the Lu/Sr ratio and the V and Ni contents in the eclogite compositions are in agreement with the fractionation of plagioclase, clinopyroxene, and olivine in their low-pressure precursor rocks. Negative correlations of SiO2 and MgO, and a low Nd/YbNMORB ratio, in the low-Mg# eclogites are in agreement with partial melt loss, but the presence of accessory quartz limits the degree of melting to 13%. Major and trace element compositions suggest that the high-Mg# eclogites, and, consequently, the lower oceanic crust, could not have experienced significant melt loss, and subduction in the Archaean may have been essentially dry, compared to the present day.
DS201809-2094
2018
Pokhilenko, N.P.Sonin, V.M., Zhimulev, E.I., Chepurov, A.A., Chepurov, A.I., Pokhilenko, N.P.Influence of the sulfur concentration in the Fe-S melt on diamond preservation under P-T conditions of the Earth's mantle.Doklady Earth Sciences, Vol. 481, 1, pp. 922-924.Mantlegeochemistry

Abstract: The results of experiments on dissolution of diamond in a Fe melt with variable concentrations of S at high P-T parameters are presented. It is established that the maximal degree of diamond dissolution occurs at a sulfur concentration of 15 wt %. With decreasing or increasing S content, dissolution of diamond slows down and almost does not occur during the period of the experiment (60 min), when the "eutectic" composition is gained. In contrast to a pure Fe melt, the presence of S decreases the carbon solubility and, therefore, reduces the aggressiveness of metal melt in relation to diamonds, thus, stimulating their preservation in the Earth’s mantle, especially if the concentration of S exceeds that in the "eutectic" composition.
DS201811-2613
2018
Pokhilenko, N.P.Tomilenko, A.A., Zhimulev, E.I., Bulbak, T.A., Sonin, V.M., Chepurov, A.I., Pokhilenko, N.P.Peculiarities of the composition of volatiles of diamonds synthesized in the Fe-S-C system: data on gas chromatography - mass spectrometry.Doklady Earth Sciences, Vol. 482, 1, pp. 1207-1211.Russiaspectrometry

Abstract: The first chromatography-mass spectroscopy data on volatiles in diamonds synthesized in the Fe-S-C system with 5 wt % S at 1400-1450°C and 5.0-5.5 GPa indicate the evolution of volatile composition during the diamond growth and, correspondingly, the variation in redox conditions of the reaction cell. A significant role is played by various hydrocarbons (HCs) and their derivatives, the content of which can reach 87%. Our data on possible abiogenic synthesis of HCs (components of natural gas and oil) can result in global recalculations (including climate) related to the global C cycle.
DS201906-1315
2019
Pokhilenko, N.P.Litasov, K.D., Kagi, H., Voropaev, S.A., Hirata, T., Ohfuji, H., Ishibashi., Makino, Y., Bekker, T.B., Sevastyanov, V.S., Afanasiev,V.P., Pokhilenko, N.P.Comparison of enigmatic diamonds from the Tolbachik arc volcano ( Kamchatka) and Tibetan ophiolites: assessing the role of contamination by synthetic materials. Gondwana Research, in press available 38p.Russia, Asia, Tibetdeposit - Tolbachik

Abstract: The enigmatic appearance of cuboctahedral diamonds in ophiolitic and arc volcanic rocks with morphology and infrared characteristics similar to synthetic diamonds that were grown from metal solvent requires a critical reappraisal. We have studied 15 diamond crystals and fragments from Tolbachik volcano lava flows, using Fourier transform infrared spectrometry (FTIR), transmission electron microscopy (TEM), synchrotron X-ray fluorescence (SRXRF) and laser ablation inductively coupled plasma mass-spectrometry (LA-ICP-MS). FTIR spectra of Tolbachik diamonds correspond to typical type Ib patterns of synthetic diamonds. In TEM films prepared using focused ion beam technique, we find Mn-Ni and Mn-Si inclusions in Tolbachik diamonds. SRXRF spectra indicate the presence of Fe-Ni and Fe-Ni-Mn inclusions with Cr, Ti, Cu, and Zn impurities. LA-ICP-MS data show variable but significantly elevated concentrations of Mn, Fe, Ni, and Cu reaching up to 70?ppm. These transition metal concentration levels are comparable with those determined by LA-ICP-MS for similar diamonds from Tibetan ophiolites. Mn-Ni (+Fe) solvent was widely used to produce industrial synthetic diamonds in the former USSR and Russia with very similar proportions of these metals. Hence, it appears highly probable that the cuboctahedral diamonds recovered from Kamchatka arc volcanic rocks represent contamination and are likely derived from drilling tools or other hard instruments. Kinetic data on diamond dissolution in basaltic magma or in fluid phase demonstrate that diamond does not form under the pressures and temperature conditions prevalent within the magmatic system beneath the modern-day Klyuchevskoy group of arc volcanoes. We also considered reference data for inclusions in ophiolitic diamonds and compared them with the composition of solvent used in industrial diamond synthesis in China. The similar inclusion chemistry close to Ni70Mn25Co5 for ophiolitic and synthetic Chinese diamonds scrutinized here suggests that most diamonds recovered from Tibetan and other ophiolites are not natural but instead have a synthetic origin. In order to mitigate further dubious reports of diamonds from unconventional tectonic settings and source rocks, we propose a set of discrimination criteria to better distinguish natural cuboctahedral diamonds from those produced synthetically in industrial environments and found as contaminants in mantle- and crust-derived rocks.
DS201909-2074
2019
Pokhilenko, N.P.Pernet-Fisher, J.F., Barry, P.H., Day, J.M.D., Pearson, D.G., Woodland, S., Agashev, A.M., Pokhilenko, L.N., Pokhilenko, N.P.Heterogeneous kimberlite metasomatism revealed from a combined He-Os isotope study of Siberian megacrustalline dunite xenoliths.Geochimica et Cosmochimica Acta, in press available 45p. PdfRussia, Siberiadeposit - Udachnaya East
DS202005-0718
2020
Pokhilenko, N.P.Afanasiev, V.P., Pokhilenko, N.P., Egorova, E.O., Lindenblot, E.S.The most ancient diamond crystals of the Siberian platform. Lamproites Morgogor Creek .. Ebelyakh River.Doklady Earth Sciences, Vol. 489, 2, pp. 1409-1412. pdf Russia, Siberiadiamond alluvials

Abstract: Based on a study of diamond grains from placers of the northeastern Siberian Platform, it is shown that certain types of diamonds (rounded dodecahedroids, diamonds of the II and V?VII varieties, according to the classification by Yu.L. Orlov) could have originated from Precambrian sources. “Ancient” diamonds also differ in terms of their sedimentological history: those of varieties V?VII, despite the maximum abrasion resistance, have the maximum degree of rounding, reflecting their more long-term sedimentological history, and, therefore, their ore bodies were likely the most ancient.
DS202006-0908
2020
Pokhilenko, N.P.Afanasiev, V.P., Pokhilenko, N.P., Grinenko, V.S., Kostin, A.V., Malkovets, V.G., Oleinikov, O.B.Kimberlitic magmatism in the south western flank of the Vilui basin. ( pyrope from Kenkeme River catchment) Jurassic-Cretaceous barren kimberlites.Doklady Earth Science, Vol. 490, 2, pp. 51-54.Russiageochronology

Abstract: We have analyzed 141 grains of pyrope from Neogene sediments in a quarry of construction materials, in the Kenkeme River catchment, along its left-side tributary (Chakiya River), about 60 km northwest of Yakutsk city. The mineral chemistry patterns of pyropes are typical of Jurassic-Cretaceous barren kimberlites, like the pipes of Obnazhennaya or Muza, but are uncommon to diamondiferous Middle Paleozoic kimberlites. The results allow identifying the magmatic event and placing time constraints on kimberlite magmatism in the southeastern flank of the Vilui basin, which was part of the Late Jurassic-Early Cretaceous tectonic-magmatic event in northeastern Asia.
DS202010-1880
2020
Pokhilenko, N.P.Sonin, V.M., Tomilenko, A.A., Zhimulev, E.I., Bulbak, T.A., Timina, T.Y., Chepurov, A.I., Pokhilenko, N.P.Diamond crystallization at high pressure: the relative efficiency of metal graphite and metal carbonate systems.Doklady Earth Sciences, Vol. 493, 1, pp. 508-512.RussiaUHP

Abstract: Data on the interaction of the Fe-Ni melt with CaCO3 and graphite at 5 GPa and 1400°? under the thermogradient conditions used in experiments on the growth of diamond on the BARS high-pressure apparatus are presented. The phase composition and component composition of the fluid captured by diamonds in the form of inclusions were studied by gas chromatography-mass spectrometry (GC-MS). Diamonds were synthesized from graphite. During the interaction of the Fe-Ni melt with CaCO3, Ca-Fe oxides and (Fe, Ni)3C carbide were formed. The stability of heavy hydrocarbons under the experimental conditions was confirmed. It was established that the composition of the fluid in synthesized diamonds is close to the composition of the fluid from inclusions in some natural diamonds. Nevertheless, it was concluded that crystallization of large diamonds under natural conditions is hardly possible due to the filling of the main crystallization volume with refractory oxide phases.
DS202011-2029
2001
Pokhilenko, N.P.Ashchepkov, I.V., Afanasiev, V.P., Pokhilenko, N.P., Sobolev, N.V., Vladykin, N.V., Saprykin, A.I., Khmelnikova, O.S., Anoshin, G.N.Small note on the composition of Brazilian mantle. *** NOTE DATERevista Brasileira de Geociencas*** ENG, Vol. 31, 4, pp. 653-660. pdfSouth America, Brazilkimberlites

Abstract: Garne ts from couc eru ratc from the vargcm l kimberl ite pipe show a long compos itional range and reveallong lincar tre nds within the lherzolite field in a Cr~Ol - CaO% dia gram (Sobolcv et til. 1974) (lip (0 11% MgO). fon ned by grains of different dimensions with fcw deviations to harzburg itcs . Larger grains (fraction +3) arc higher in CaO with less Cr~01 (to 5.5%). TIle Cr20 1 freq uen cy reduc es in hyperbo lic function for each fraction . IImenites reve;1142-56% Ti0 2l..'Olllpositionai range with linear FeO - MgO correhuions but 3(4) separate groups for A I ~01 suggest different proport ion of co-prccipimted gimlet , probably due to polybn ric Irncnonanon. lncreasing Cr~O l nnd r"t..-Q% conte nt (fractionation uegn:e ) with red ucing TiO~ is in accord with Ar c mod el.. Ganict xenolith fnnnldnin II pipe with large Ga r- Cpxgrains and fine Mica-Curb bearing mat rix refer to 60 kbcr and 35 mv/m2 gcothcrm . 11displays enr iched trace c lement pat ter ns but not completely equilibrated compositions for Ga r anti Cpx. sugges ting low degree me lting of rela tively fertile mantle. St udied uuuc rinlmay s uggcsrmcrasomu tized, relat ively fertile and irre gularly heated mantle bene ath Sombcrn Bra zil as found by (Carvalho & Lccnnrdos 1997).
DS202011-2071
2020
Pokhilenko, N.P.Zhimulev, E.I., Babich, Yu.V., Karpovich, Z.A., Chepurov, A.I., Pokhilenko, N.P.Low nitrogen diamond growth in Fe-C-S system.Doklady Earth Sciences, Vol. 494, 1, pp. 696-698.Russiadiamond genesis

Abstract: The first results on diamond growth in the Fe-?-S system with 1 wt % S (relative to Fe) at 6 GPa and 1450°C have been reported. The diamonds obtained contain about 30 ppm N, on average, and belong to the low-N transition diamond group Ib-IIa. It has been suggested that the reduction conditions formed by certain active elements such as S can play an important role in the formation of natural low-N diamonds.
DS1970-0829
1973
Pokhilenko, N.P. USOVA.Sobolev, N.V., Lavrentev, Y.G., Pokhilenko, N.P. USOVA.Chrome Rich Garnets from Kimberlites of Yakutia and their ParagenesesContributions to Mineralogy and Petrology, Vol. 40, pp. 39-52.Russia, YakutiaMineralogy - Garnets
DS1998-0816
1998
Pokhilenlo, N.P.Kuligin, S.S., Pokhilenlo, N.P.Mineralogy of xenoliths of garnet pyroxenites from kimberlite pipes of Siberian Platform7th International Kimberlite Conference Abstract, pp. 480-2.Russia, SiberiaPyroxenite paragenesis, Deposit - Udachnaya, Mir, Obnazhennaya
DS1988-0009
1988
Pokhvisneva, E.A.Altukov, E.N., Pokhvisneva, E.A.On the regularities of carbonatite distribution. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 298, No. 3, pp. 684-688RussiaCarbonatite
DS1988-0007
1988
Pokhvisneva, Ye.A.Altukhov, Ye.N., Pokhvisneva, Ye.A.Laws of carbonatite location.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 298, No. 3, pp. 684-687RussiaCarbonatite, Distribution
DS1989-0022
1989
Pokhvisneva, Ye.A.Altukhov, Ye.N., Pokhvisneva, Ye.A.Patterns of distribution of carbonatitesDoklady Academy of Science USSR, Earth Science Section, Vol. 298, No. 1-6, April pp. 60-63RussiaCarbonatite, Distribution
DS201112-0808
2011
Pokilanko, L.N.Pokilanko, L.N., Golovin, A.V., Shrygin, I.S., Pokhilenko, N.P.Accessory minerals of mantle xenoliths: first finds of Cl-free K-Fe sulphides.Doklady Earth Sciences, Vol. 440, 2, pp. 1404-1409.MantleXenolith petrology
DS201112-0182
2011
Pokilenko, N.P.Chepurov, A.I., Zhimulev, E.I., Sonin, V.M., Chepurov, A.A., Tomilenko, A.A., Pokilenko, N.P.Experimental estimation of the rate of gravitiation fractioning of xenocrysts in kimberlite magma at high P-T parameters.Doklady Earth Sciences, Vol. 440, 2, pp. 1427-1430.MantleDiamond genesis
DS201112-0809
2011
Pokrovskaya, N.E.Pokrovskaya, N.E., Litvin, Yu.A.Experimental modeling of syngenesis of diamond and minerals of peridotite and eclogite parageneses.Vestnik ONZ RAN *** in english, 4p. IN ENGLISHTechnologyMantle melting - genesis of diamond
DS201709-1962
2017
Pokrovski, G.S.Borisova, A.Y., Zagrtdenov, N.R., Toplis, M.J., Bohrson, W.A., Nedelec, A., Safonov, O.G., Pokrovski, G.S., Ceileneer, G., Melnik, O.E., Bychkov, A.Y., Gurenko, A.A., Shscheka, S., Terehin, A., Polukeev, V.M., Varlamov, D.A., Gouy, S., De Parseval, P.Making Earth's continental crust from serpentinite and basalt. Goldschmidt Conference, abstract 1p.Mantleperidotites

Abstract: How the Earth's continental crust was formed in the Hadean eon is a subject of considerable debates [1-4]. For example, shallow hydrous peridotites [2,5], in particular the Hadean Earth's serpentinites [6], are potentially important ingredients in the creation of the continental ptoto-crust, but the mechanisms of this formation remain elusive. In this work, experiments to explore serpentinite-basalt interaction under conditions of the Hadean Earth were conducted. Kinetic runs lasting 0.5 to 48 hours at 0.2 to 1.0 GPa and 1250 to 1300°C reveal dehydration of serpentinite and release of a Si-Al-Na-K-rich aqueous fluid. For the first time, generation of heterogeneous hydrous silicic melts (56 to 67 wt% SiO2) in response to the fluid-assisted fertilisation and the subsequent partial melting of the dehydrated serpentinite has been discovered. The melts produced at 0.2 GPa have compositions similar to those of the bulk continental crust [2,3]. These new findings imply that the Earth's sialic proto-crust may be generated via fluid-assisted melting of serpentinized peridotite at shallow depths (=7 km) that do not require plate subduction during the Hadean eon. Shallow serpentinite dehydration and melting may be the principal physico-chemical processes affecting the earliest lithosphere. Making Earth's continental crust from serpentinite and basalt.
DS1998-1176
1998
Pokrovskii, B.G.Pokrovskii, B.G., Andreeva, Vrublevskii, GrinevContamination mechanisms of alkaline gabbroid intrusions in the southern framing of Siberian PlatformPetrology, Vol. 6, No. 3, June, pp. 230-236.Russia, SiberiaGeochronology, Alkaline rocks
DS1998-1177
1998
Pokrovskii, B.G.Pokrovskii, B.G., Seliverstov, V.A.Carbon and oxygen isotope composition of carbonatites from easternKamchatka.Geochemistry International, Vol. 36, No. 1, Jan. pp. 34-39.Russia, KamchatkaCarbonatite, Geochronology
DS2001-0937
2001
Pokrovskii, B.G.Pokrovskii, B.G., et al.Oxygen and carbon isotopic compositions of carbonatite like rocks in the Tunguska synclise.Petrology, Vol. 9, No. 4, pp. 376-RussiaCarbonatite, Geochronology
DS2001-0938
2001
Pokrovskii, B.G.Pokrovskii, B.G., Kravchenko, S.M.Stable isotopes in the Khibiny and Lovozero Massifs: magma sources and conditions postmagmatic alterationsGeochem, International, Vol. 39, No. S1 S88-98.RussiaGeochronology
DS2003-1435
2003
Pokrovskii, B.G.Vrublevskii, V.V., Pokrovskii, B.G., Zhuravlev, D.Z., Anoshin, G.N.Composition and age of the Penchenga linear carbonatite complex, Yenesei RangePetrology, Vol. 11, 2, pp. 130-146.RussiaCarbonatite, Geochronology
DS2003-1526
2003
Pokrovskii, B.G.Yarmolyuk, V.V., Ivanov, V.G., Kovalenko, V.I., Pokrovskii, B.G.Magmatism and geodynamics of the southern Baikal volcanic region ( mantle hot spot):Petrology, Vol. 11, No. 1, pp. 1-30.RussiaGeochronology, Geochemistry
DS1987-0589
1987
Pokrovskiy, B.G.Pokrovskiy, B.G., Vinogradov, V.I.Isotope composition of some elements in ultrabasic Alkaline rocks of the Meimecha-Kotui province.(USSR).(Russian)Soviet Geology, (Russian), No. 5, pp. 81-91RussiaBlank
DS1991-1361
1991
Pokrovskiy, B.G.Pokrovskiy, B.G., Andreyeva, Ye.D.Petrography and isotope geochemistry of melilite rocks associated with the Patyn pluton #1International Geology Review, Vol. 33, No. 7, July, pp. 689-703RussiaMelilite, Patyn pluton
DS1991-1362
1991
Pokrovskiy, B.G.Pokrovskiy, B.G., Belyakov, A.Yu., Kravchenko, S.M., GryaznovaIsotope dat a on the origin of carbonatites and mineralized strat a in the Tomtor intrusion, northwest YakutiaGeochemistry International, Vol. 28, No. 4, pp. 93-101RussiaCarbonatite, Geochronology
DS1991-1363
1991
Pokrovskiy, B.G.Pokrovskiy, B.G., Vinogradov, V.I.Isotope investigations on alkalic rocks of central and western SiberiaInternational Geology Review, Vol. 33, No. 2, February pp. 122-134RussiaGeochronology, Alkaline rocks
DS1993-0853
1993
Pokrovskiy, B.G.Kravchenko, S.M., Belyakov, A.Yu., Pokrovskiy, B.G.Geochemistry and origin of the Tomtor massif in the North SiberianPlatformGeochemistry International, Vol. 30, No. 3, pp. 20-36.RussiaAlkali ultrabasic complex, Rare earth
DS1994-0950
1994
Pokrovskiy, B.G.Kravchenko, S.M., Belyakov, A.Yu., Pokrovskiy, B.G.Geochemistry and origin of the Tomtor Massif (North Siberian Platform)Doklady Academy of Sciences Acad. Science, Vol. 322, pp. 170-176.Russia, SiberiaCarbonatite, Tomtor Massif
DS200612-0979
2006
Pokrovsky, B.G.Nikiforov, A.V., Bolonin, A.V., Pokrovsky, B.G., Sugorokova, A.M., Chugaev, A.V., Lykhin, D.A.Isotope geochemistry ( O, C, S. Sr) and Rb-Sr age of carbonatites in Central Tuva.Geology of Ore Deposits, Vol. 48, 4, pp. 256-276.RussiaCarbonatite
DS201805-0953
2018
Pokrovsky, B.G.Ivanov, A.V., Mukasa, S.B., Kamenetsky, V.S., Ackerman, M., Demonterova, E.I., Pokrovsky, B.G., Vladykin, N.V., Kolesnichenko, M.V., Litasov, K.D., Zedgenizov, D.A.Origin of high-Mg melts by volatile fluxing without significant excess of temperature.Chemical Geology, https://doi.org/ 10.1016/j .chemgeo. 2018.03.11Russiameimechites
DS1900-0683
1908
Polak, H.Levitcus, F., Polak, H.Geillustreerde Encyclopaedie der DiamantnizverheidHaarlem: Erven F Bohn., 526P.GlobalDictionary, History, Kimberley
DS201801-0048
2017
Polak, L.Polak, L., Ackerman, L., Rapprich, V., Magna, T.Platinum group element and rhenium osmium geochemistry of selected carbonatites from India, USA and East africa.Carbonatite-alkaline rocks and associated mineral deposits , Dec. 8-11, abstract p. 22-23.India, United States, Africa, East Africacarbonatites

Abstract: Carbonatites and associated alkaline silicate rocks might have potential economic impact for a large variety of metals such as Cu, Ni, Fe and platinum-group elements (PGE - Os, Ir, Ru, Pd, Pt) as it is demonstrated in South Africa (Phalaborwa; Taylor et al. 2009) or Brazil (Ipanema; Fontana 2006). In addition, determined PGE contents along with Re-Os isotopic compositions may also provide important information about PGE fractionation during the genesis of upper mantle-derived carbonatitic melts and nature of their sources. Nevertheless, the existing PGE data for carbonatites are extremely rare, limited mostly to Chinese localities and they are not paralleled by Re-Os isotopic data (Xu et al. 2008). Therefore, in this study, we present the first complete PGE datasets together with Re-Os determinations for a suite of selected carbonatite bodies worldwide. We have chosen eight carbonatite sites with different alkaline rock association, age and geotectonic position. Among these, the youngest samples are from East African rift system and include Oldoinyo Dili, Tanzania with an age spanning from ~0 to 45 Ma; same as Tororo and Sukulu in Uganda (Woolley and Kjarsgaard 2008). These carbonatites are in association with pyroxenites and nepheline syenites. Another young carbonatitic complex is Amba Dongar in west India with Cretaceous age of ~65 Ma associated with alkaline volcanic rocks such as trachybasalts within Deccan Traps (Sukheswala and Udas 1963). Proterozoic bodies are represented by Iron Hill, USA carbonatites associated with pyroxenite, melitolite and ijolite with age ranging from ~520 to 580 Ma (Nash 1972). These carbonatites are famous for their intensive and varied fenitization. Last and the oldest carbonatites in this study comes from Samalpatti and Sevattur, South India having the age of ~800 Ma (Schleicher et al. 1997) and outcropping as small bodies within alkaline rocks such as pyroxenite, syenite and gabbro. The PGE concentrations and Re-Os isotopic ratios were determined by standard methods consisting of decarbonatization using HCl, decomposition of samples in Carius Tubes in the presence of reverse aqua regia and spikes (isotopic dilution), separation of Os by CHCl3 followed by N-TIMS measurements and Ir, Ru, Pd, Pt, Re isolation by anion exchange chromatography followed by ICP-MS measurements. All analysed carbonatites exhibit extremely low PGE contents (S PGE up to 1 ppb), even in the samples with high S contents (up to 1.5 wt. %). Such values are much lower than other determined so far for upper mantle-derived melts such as basalts, komatiites, etc. (Day et al. 2016). Such signatures indicate very low partitioning of PGE into carbonatitic melts and/or early separation of PGE-bearing fraction. Elements from iridium-group I-PGE; Os, Ir and Ru; mostly < 0.1 ppb) are distinctly lower compared to palladiumgroup elements and Re (PPGE; Pt, Pd, Re; mostly > 0.1 ppb) with some rocks being largely enriched in Re (up to ~6 ppb). Most of the analysed carbonatites exhibit progressive enrichment from Os to Re and consequently, PdN/ReN < 0.1 except south India carbonatites and associated alkaline rocks (> 0.30). Rocks analysed so far for Os have OsN/IrN up to 6.2 that might suggest that the carbonatites might concentrate Os over Ir. The highest HSEtot contents have been found in Mg-Cr-rich silicocarbonatites from South India (up to 40 ppb) and taking into account their only slightly radiogenic 187Os/188Os ratios (0.14-0.57), these rocks represents mixture of CO2-rich alkaline mantle melts and country rocks. Very high concentrations of HSE have been also found in magnetite separated from Fe-carbonatite from Amba Dongar, India (0.2-0.5 ppb of I-PGE and 0.9-9 ppb of P-PGE). The 187Os/188Os ratios determined so far for carbonatites from South India vary from 0.24 to 6.5 and calculated ?Os values range from +100 up to +5000. Such wide range of values suggest extremely heterogenous source of the melts and/or possible contamination by 187Os-rich crustal materials.
DS201910-2241
2019
Polak, L.Ackerman, L., Polak, L., Magna, T., Rapprich, V., Jana, D., Upadhyay, D.Highly siderophile element geochemistry and Re-Os isotopic systematics of carbonatites: insights from Tamil Nadu, India.Earth and Planetary Science letters, Vol. 520, pp. 175-187.Indiacarbonatites

Abstract: Carbonatite metasomatism has been widely implicated for worldwide mafic mantle suites but so far, no combined data have been available for highly siderophile element systematics (HSE - Os, Ir, Ru, Pt, Pd, Re) and Re-Os isotopic compositions in carbonatites themselves. We present the first systematic survey of the HSE and Re-Os isotopic compositions in a suite of well-characterized Neoproterozoic carbonatites, silicocarbonatites and associated silicate rocks (pyroxenites, monzogabbros, syenites) from south India in order to place constraints on the HSE systematics in carbonatite magmas, anchoring possible mantle sources of carbonatites and relationship to the ambient crustal lithologies as well as preliminary constraints on carbonatite metasomatism in Earth's mantle. The most plausible explanation for generally low HSE contents in calciocarbonatites from Tamil Nadu (?HSE < 1.22 ppb) involves a low-degree (<1%) partial melting of the mantle source producing sulfur-saturated carbonatitic magmas leaving behind sulfide phases retaining HSE. The new data also indicate a strong FeO control on the distribution of Os and Pt during segregation of carbonatite melt from its enriched mantle source and/or melt differentiation. The combined 187Re/188Os values (from 0.10 to 217), 187Os/188Os ratios (0.186-10.4) and initial ?Os values back-calculated to 800 Ma (from +0.1 to +6052) predict that most Tamil Nadu calciocarbonatites were plausibly derived from a carbonated peridotite source with <10% recycled component. This model would thus provide significant constraints on the origin/source of carbonatites, irrespective of their post-emplacement history. The unusual, volumetrically rare, Mg-Cr-rich silicocarbonatites (?HSE = 14-41 ppb) display almost identical HSE patterns with those of host pyroxenites and predominantly high Pt (up to 38 ppb), the origin of which remains unknown. Positive co-variations between Pt, Pd and Re, and the well-developed positive correlation between Pt and MgO in these Mg-Cr-rich silicocarbonatites argue for a source coming predominantly from the upper mantle. The Re-Os isotopic systematics agree with direct incorporation of enriched mantle-derived material into parental melts but variable incorporation of potassium-rich crustal materials is evidenced by highly positive ?Os800 Ma values for a sub-suite of Mg-Cr-rich silicocarbonatites, indicating intense fenitization. The highly radiogenic Os isotopic compositions of monzogabbros and a syenite argue for their derivation from crustal lithologies with no or only negligible contribution of mantle material. Collectively, low Ir, Ru, Pt and Pd contents found in the Tamil Nadu carbonatites appear to indicate the incapability to significantly modify the total budget of these elements in the Earth's mantle during carbonatite metasomatism. In contrast, very high Re/Os ratios found in some of the analyzed carbonatites, paralleled by extremely radiogenic 187Os/188Os signature, can produce large modification of the Re-Os isotopic composition of mantle peridotites during carbonatite melt percolation when high melt/rock ratios are achieved.
DS1994-0480
1994
Poland, L.J.Eby, G.N., Maher, S.G., Poland, L.J.Petrology and geochemistry of the Beemerville nepheline syenite complex, northern New Jersey, USAGeological Association of Canada (GAC) Abstract Volume, Vol. 19, p. posterGlobalAlkaline rocks, Beemerville
DS201710-2210
2017
Poland, M.P.Anderson, K.R., Poland, M.P.Abundant carbon in the mantle beneath Hawaii.Nature Geoscience, Vol. 10, 9, pp. 704-708.United States, Hawaiicarbon

Abstract: Estimates of carbon concentrations in Earth’s mantle vary over more than an order of magnitude, hindering our ability to understand mantle structure and mineralogy, partial melting, and the carbon cycle. CO2 concentrations in mantle-derived magmas supplying hotspot ocean island volcanoes yield our most direct constraints on mantle carbon, but are extensively modified by degassing during ascent. Here we show that undegassed magmatic and mantle carbon concentrations may be estimated in a Bayesian framework using diverse geologic information at an ocean island volcano. Our CO2 concentration estimates do not rely upon complex degassing models, geochemical tracer elements, assumed magma supply rates, or rare undegassed rock samples. Rather, we couple volcanic CO2 emission rates with probabilistic magma supply rates, which are obtained indirectly from magma storage and eruption rates. We estimate that the CO2 content of mantle-derived magma supplying Hawai‘i’s active volcanoes is 0.97-0.19+0.25 wt% -roughly 40% higher than previously believed-and is supplied from a mantle source region with a carbon concentration of 263-62+81?ppm. Our results suggest that mantle plumes and ocean island basalts are carbon-rich. Our data also shed light on helium isotope abundances, CO2/Nb ratios, and may imply higher CO2 emission rates from ocean island volcanoes.
DS201212-0563
2012
Polansky, O.P.Polansky, O.P., Korobeynikov, S.N., Babichev, A.V., Reverdatto, V.V.Formation and upwelling of mantle diapirs through the cratonic lithosphere: numerical thermomechanical modeling.Petrology, Vol. 20, 2, pp. 120-137.Russia, SiberiaMagmatism
DS1999-0386
1999
Polat, A.Kusky, T.M., Polat, A.Growth of granite greenstone terranes at convergent margins, and stabilization of Archean Cratons.Tectonophysics, Vol. 305, No. 1-3, May 10, pp. 43-74.GlobalCraton
DS2000-0487
2000
Polat, A.Kerrich, R., Polat, A.The mechanism and timing of growth and recycling of Archean continental crust: incompatible trace elementsGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) 2000 Conference, 3p. abstract.Ontario, ManitobaSuperior Province - model, Subduction
DS2001-0939
2001
Polat, A.Polat, A., Kerrich, R.Geodynamic processes, continental growth, and mantle evolution recorded in late Archean greenstone belts...Precambrian Research, Vol. 112, No. 1-2, pp. 5-25.OntarioSuperior Province - southern, Tectonics
DS2002-1271
2002
Polat, A.Polat, A., Hofmann, A.W., Rosing, M.T.Boninite like volcanic rocks in the 3.7-3.8 Ga Isua greenstone belt: geochemical evidence for intra oceanicChemical Geology, Vol. 184, No.3-4, pp.231-54.GreenlandSubduction zone - Early Earth
DS2002-1272
2002
Polat, A.Polat, A., Kerrich, R.Nd isotope systematics of 2.7 Ga adakites, magnesian andesites and arc basalts, Superior Province: evidence for shallow crustal recycling at Archean subduction zonesEarth and Planetary Science Letters, Vol. 202, 2, pp. 345-60.Manitoba, Saskatchewan, Alberta, Northwest TerritoriesSubduction, Geochronology
DS2002-1744
2002
Polat, A.Wyman, D.A., Kerrich, R., Polat, A.Assembly of Archean cratonic mantle lithosphere and crust: plume arc interaction in the Abitibi Wawa subduction accretion complex.Precambrian Research, Vol.115,No.1-4, pp.37-62.Ontario, QuebecCraton - hot spot, Tectonics
DS200412-0580
2004
Polat, A.Frei, R., Polat, A., Meibom, A.The Hadean upper mantle conundrum: evidence for source depletion and enrichment from Sm-Nd Re-Os and Pb isotopic compositions inGeochimica et Cosmochimica Acta, Vol. 68, 7, April 1, pp. 1645-1660.Europe, GreenlandGeochronology, boninites
DS200612-0690
2006
Polat, A.Kerrich, R., Polat, A.Archean greenstone tonalite duality: thermochemical mantle convection models or plate tectonics in the early Earth global dynamics?Tectonophysics, Vol. 415, 1-4, pp. 141-165.MantleGeothermometry, convection, plumes, arc volcanism
DS200612-1098
2006
Polat, A.Polat, A., Herxberg, C., Munker, C., Rodgers, R., Kusky, T., Li, J., Fryer, B.Geochemical and petrological evidence for a supra subduction zone origin of Neoarchean (ca 2.5 Ga) peridotites, central orogenic belt, North Chin a craton.Geological Society of America Bulletin, Vol. 118, 7, July pp. 771-784.ChinaPeridotite, picrites
DS200612-1099
2005
Polat, A.Polat, A., Kerrich, R.Reading the geochemical fingerprints of Archean hot subduction volcanic rocks: evidence for accretion and crustal recycling in a mobile tectonic regime.Benn, K., Mareschal, J-C., Condie, K.C. Archean Geodynamics and Environments, AGU Geophysical Monograph, No. 164, pp. 189-214.Canada, Ontario, Superior ProvinceTectonics - subduction
DS200712-0445
2007
Polat, A.Hoffmann, J.E., Munker, C., Polat, A., Mezger, K.Evidence for Hadean mantle depletion in the sources of ~ 3.75 Ga subduction related rocks, Isua, SW Greenland.Plates, Plumes, and Paradigms, 1p. abstract p. A410.Europe, GreenlandSubduction - boninites
DS200812-0286
2008
Polat, A.Dilek, Y., Polat, A.Supra subduction zone ophiolites and Archean tectonics.Geology, Vol. 36., 5, pp. 431-432.GlobalOphiolites
DS200912-0590
2009
Polat, A.Polat, A., Kerrich, R., Windley, R.Archean crustal growth processes in southern West Greenland and the southern Superior Province, geodynamic and magmatic constraints.Geological Society of London, Special Publication Earth Accretionary systems in Space and Time, No. 318, pp. 155-191.Canada, Ontario, Europe, GreenlandGeodynamics
DS201012-0350
2010
Polat, A.Kerrich, R., Wyman, D., Polat, A.Archean lithospheric mantle: plume arc interaction.Goldschmidt 2010 abstracts, AbstractMantleReview paper
DS201112-0810
2011
Polat, A.Polat, A., Appel, P.W.U., Fryer, B.J.An overview of the geochemistry of Eoarchean to Mesoarchean ultramafic to mafic volcanic rocks, SW Greenland: implications for mantle depletionGondwana Research, Vol. 20, 2-3, pp. 255-273.MantlePetrogenetic processes at subduction zones Early Earth
DS201603-0377
2015
Polat, A.Friedman, E., Polat, A., Thorkelson, D.J., Frei, R.Lithospheric mantle xenoliths sampled by melts from upwelling asthenosphere: the Quaternary Tasse alkaline basalts of southeastern British Columbia, Canada.Gondwana Research, In press available 22p.Canada, British ColumbiaAlkaline rocks, basalts

Abstract: The Quaternary Tasse basalts are exposed near the north shore of Quesnel Lake in southeastern British Columbia. They host a variety of mantle xenoliths consisting predominantly of spinel lherzolite with minor dunite and pyroxenite. Mineralogically, the xenoliths are composed of olivine, orthopyroxene, clinopyroxene and spinel characterized by forsterite (Fo87-93), enstatite (En90-92), diopside (En45-50-Wo40-45-Fs5), and Cr-spinel (6 - 11 wt.% Cr), respectively. All of the mantle xenoliths are coarse-grained and show granoblastic textures. Clinopyroxene and spinel display textural evidence for chemical reactions with percolating melts. The mantle xenoliths are characterized by restricted Mg-numbers (89 - 92) and low abundances of incompatible elements (Ba = 2 - 11 ppm; Sr = 3 - 31 ppm) and Yttrium (1 - 3 ppm). On the basis of REE patterns, the xenoliths are divided into three groups reflecting the various degrees of mantle metasomatism: (1) Group 1 consists of concave-up LREE patterns (La/Smcn = 0.48 - 1.16; Gd/Ybcn = 0.71 - 0.92); (2) Group 2 possesses flat to moderately LREE-enriched patterns (La/Smcn = 1.14 - 1.92; Gd/Ybcn = 0.87 - 1.09); and (3) Group 3 is characterized by strongly LREE-enriched patterns (La/Smcn = 1.53 - 2.45; Gd/Ybcn = 1.00 - 1.32). On MORB-normalized trace element diagrams, the majority of the xenolith samples share the enrichment of LILE (Rb, Ba, K), U, Th, Pb, Sr and the depletion of HFSE (Nb, Ta, Ti, Y) relative to REE. These geochemical characteristics are consistent with a compositionally heterogeneous subcontinental lithospheric mantle source that originated as subarc mantle wedge peridotite at a convergent plate margin. The Tasse basalts have alkaline compositions characterized by low SiO2 (44 - 46 wt.%) and high alkali (Na2O + K2O = 5.1 - 6.6 wt.%) contents. They are strongly enriched in incompatible elements (TiO2 = 2.4 - 3.1 wt.%; Ba = 580 - 797 ppm; Sr = 872 - 993 ppm) and, display OIB-like trace element patterns (La/Smn = 3.15 - 3.85; Gd/Ybn = 3.42 - 4.61). They have positive eNd (+ 3.8 to + 5.5) values, with 338 - 426 Ma depleted mantle model ages, and display uniform OIB-like Sr (87Sr/86Sr = 0.703346 - 0.703591) and Pb (206Pb/204Pb = 19.40 - 19.58; 207Pb/204Pb = 15.57 - 15.60; 208Pb/204Pb = 38.99 - 39.14) isotopic compositions. The basalts erupted discontinuously along a > 1000 km long SE-NW-trending linear belt with minimal compositional variation indicative of a homogenous mantle source. The Sr - Nd - Pb isotope and trace element systematics of the alkaline basalts suggests that they originated from partial melting of an upwelling asthenospheric mantle source. Melting of the asthenospheric mantle might have stemmed from extension of the overlying lithosphere in response to the early stages of back-arc basin opening in the Omineca and Intermontane belts. Ridge subduction beneath the Canadian Cordillera might have played an important role in the weakening of the lithospheric mantle prior to its extension. Alternatively, melting of the upwelling asthenosphere in response to the delamination of the lithospheric mantle beneath the Rocky Mountain Trench might have generated the alkaline lavas.
DS202012-2255
2020
Polat, A.Windley, B.F., Kusky, T., Polat, A.Onset of plate tectonics by the Eoarchean. ( accretionary and collisional)Precambrian Research, in press available, 43p. PdfMantleplate tectonics

Abstract: One of the most contentious areas of Earth Science today is when, or whether or not modern-style plate tectonics was in operation in the Archean Eon. In this review we present evidence that the onset of plate tectonics was not at 3.2 Ga, as popularly conceived, but was in operation during the Eoarchean by at least ca. 4.0 Ga. Following a review of the main Eoarchean supracrustal belts of the world, constrained by relevant geochemical/isotopic data, we present evidence that suggests that from at least ca. 4.0 Ga Earth produced considerable juvenile mafic crust and consequent island arcs by Accretionary Cycle Plate Tectonics. From ~3.2 Ga there was a gradual transition in geodynamics to more abundant active continental margin magmatism in the form of voluminous TTGs and sanukitoids. From 3.2 Ga to 2.5 Ga juvenile oceanic crust and arcs continued to form, accompanied by more active continental margin magmatism until ~2.7-2.5 Ga, by which time there were sufficient crustal rocks to amalgamate into incipient large continents, the fragmentation of which started the first complete classical Wilson Cycle Plate Tectonics of breaking apart and re-assembling large continental masses. In other words, there were two types of plate tectonics in operation in the early Earth, Accretionary Cycle Plate Tectonics and Wilson Cycle Plate Tectonics, but Wilson Cycle type plate interactions only became more common after contiguous continental landmass became voluminous and extensive enough around 2.7-2.5 Ga. Failure to realize this dual mechanism of continental growth may lead to erroneous ideas such as "plate tectonics started at 3.2 Ga", or "mantle plumes generated early Archean magmatic rocks." We present new geochemical data that together with lithological and structural relationships, negate the various plume-type speculations including stagnant lids, heat pipes, and mushy-lid tectonics. It is interesting to consider that the way Earth’s crust developed in the first Gigayear of the geological record continued later, albeit in more advanced forms, into the Phanerozoic, where we can still recognize Accretionary Cycle Plate Tectonics and orogens still with short boundaries in examples including the Altaids of Central Asia, the Arabian-Nubian Shield, the Japanese Islands, and in incipient form in Indonesia, as well as Wilson Cycle Plate Tectonics that leads inexorably to continental collisions as in the Alpine-Himalayan orogen with its long plate boundaries. We recommend this holistic view of crustal growth and the evolution of continents that leads to a robust, viable, and testable model of Earth evolution.
DS200612-0747
2006
Polazchenko, O.Kudrayvtseva, G.P., Posukhova, T.V., Polazchenko, O.Diamonds from the V Grib pipe: internal structure and origin.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 140.RussiaGrip - diamond morphology
DS201212-0419
2012
Polekhovsky, I.N.Lokhov, K., Lukyanova, L., Antonev, A.V., Polekhovsky, I.N., Antonov, A.V., Afanasev, Z.L., Bogomolov, E.S., Sergeev, S.A.U Pb and Lu-Hf isotopic systems in zircons and Hf-Nd isotopic systemization of the Kimozero kimberlites, Karelia.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractRussia, Archangel, Kola PeninsulaDeposit - Kimozero
DS200812-0299
2008
Polekhovsky, Yu.Dubopvikova, Z., Polekhovsky, Yu.Some special features of Kimozero kimberlites of Onega Flexure (Karelia, Russia).9IKC.com, 3p. extended abstractRussiaDeposit - Kimozero
DS1995-1508
1995
Polet, J.Polet, J., Anderson, D.L.Depth extent of cratons as inferred from tomographic studiesGeology, Vol. 23, No. 3, March pp. 205-208.Canada, South AfricaCraton, Tomography
DS1997-0339
1997
Poletaev, A.I.Fedorenko, V.S., Kalinin, E.V., Poletaev, A.I.Construction of geodynamic models of the endogenic and exogenic activity Of the earth's crustMoscow University of Bulletin, Vol. 51, No. 5, pp. 40-43RussiaGeodynamic, tectonic
DS201611-2132
2016
Poletti, J.E.Poletti, J.E., Cottle, J.M., Hagen-Peter, G.A., Lackey, J.S.Petrochronological constraints on the origin of the Mountain Pass ultrapotassic and carbonatite intrusive suite, California.Journal of Petrology, In press available, 44p.United States, CaliforniaCarbonatite

Abstract: Rare earth element (REE) ore-bearing carbonatite dikes and a stock at Mountain Pass, California, are spatially associated with a suite of ultrapotassic plutonic rocks, and it has been proposed that the two are genetically related. This hypothesis is problematic, given that existing geochronological constraints indicate that the carbonatite is ~15-25 Myr younger than the ultrapotassic rocks, requiring alternative models for the formation of the REE ore-bearing carbonatite during a separate event and/or via a different mechanism. New laser ablation split-stream inductively coupled plasma mass spectrometry (LASS-ICP-MS) petrochronological data from ultrapotassic intrusive rocks from Mountain Pass yield titanite and zircon U-Pb dates from 1429?±?10 to 1385?±?18?Ma, expanding the age range of the ultrapotassic rocks in the complex by ~20 Myr. The ages of the youngest ultrapotassic rocks overlap monazite Th-Pb ages from a carbonatite dike and the main carbonatite ore body (1396?±?16 and 1371?±?10?Ma, respectively). The Hf isotope compositions of zircon in the ultrapotassic rocks are uniform, both within and between samples, with a weighted mean eHfi of 1•9?±?0•2 (MSWD?=?0•9), indicating derivation from a common, isotopically homogeneous source. In contrast, in situ Nd isotopic data for titanite in the ultrapotassic rocks are variable (eNdi?=?-3•5 to -12), suggesting variable contamination by an isotopically enriched source. The most primitive eNdi isotopic signatures, however, do overlap eNdi from monazite (eNdi?=?-2•8?±?0•2) and bastnäsite (eNdi?=?-3•2?±?0•3) in the ore-bearing carbonatite, suggesting derivation from a common source. The data presented here indicate that ultrapotassic magmatism occurred in up to three phases at Mountain Pass (~1425, ~1405, and ~1380?Ma). The latter two stages were coeval with carbonatite magmatism, revealing previously unrecognized synchronicity in ultrapotassic and carbonatite magmatism at Mountain Pass. Despite this temporal overlap, major and trace element geochemical data are inconsistent with derivation of the carbonatite and ultrapotassic rocks by liquid immiscibility or fractional crystallization from common parental magma. Instead, we propose that the carbonatite was generated as a primary melt from the same source as the ultrapotassic rocks, and that although it is unique, the Mountain Pass ultrapotassic and carbonatite suite is broadly similar to other alkaline silicate-carbonatite occurrences in which the two rock types were generated as separate mantle melts.
DS1987-0221
1987
Poli, G.Francalanci, L., Peccerillo, A., Poli, G.Partition coefficients for minerals in potassium alkaline rocks: dat a from Roman province (Central Italy)Geochemical Journal, Vol. 21, No. 1, pp. 1-10ItalyAlkaline rocks, Analyses
DS1988-0537
1988
Poli, G.Peccerillo, A., Poli, G., Serri, G.Petrogenesis of oreniditic and kamafugitic rocks from central ItalyCanadian Mineralogist, Vol. 26, No. 1, March pp. 23-44ItalyBlank
DS2002-1273
2002
Poli, G.Poli, G., Perugini, D.Strange attractors in magmas: evidence from lava flowsLithos, Vol. 65, 3-4, Dec. pp. 287-97.GlobalMagmatism
DS200512-0850
2005
Poli, G.Petrilli, M., Poli, G., Perugini, D., Peccerillo, A.PetroGraph: a new software to visualize, model, and present geochemical dat a in igneous petrology.Geochemistry, Geophysics, Geosystems: G3, Vol. 6, doi. 10.1029/2005 GC000932TechnologyComputer - program, PetroGraph, major, trace elements
DS201312-0172
2013
Poli, G.Contincelli, S., Avanzinelli, R., Poli, G., Braschi, E., Giordano, G.Shift from lamproite-like to leucitic rocks: Sr-Nd-Pb isotope dat a from the Monte Cimino volcanic complex vs the Vico stratovolcano, central Italy.Chemical Geology, Vol. 353, pp. 246-266.Europe, ItalyLeucites
DS201312-0194
2013
Poli, G.Conticelli, S., Avanzinelli, R., Poli, G., Braschi, E., Giordano, G.Shift from lamproite-like to leucitic rocks: Sr-Nd-Pb isotope dat a from the Monte Cimino volcanic complex vs the Vico stratovolcano, central Italy.Chemical Geology, Vol. 353, pp. 246-266.Europe, ItalyLamproite
DS2001-0940
2001
Poli, L.C.Poli, L.C., Oliver, G.J.H.Constrictional deformation in the central zone of the Damara Orogen, NamibiaJournal of African Earth Sciences, Vol.33,2,Aug.pp.303-321.NamibiaTectonics
DS2001-0941
2001
Poli, L.C.Poli, L.C., Oliver, G.J.H.Constrictional deformation in the Central Zone of the Damara Orogen, NamibiaJournal of African Earth Sciences, Vol.33,2,Aug.pp.303-22.NamibiaTectonics - structure, Orogeny
DS201312-0088
2013
Poli, P.Bou, P., Poli, P., Campillo, M., Pedersen, H., Briand, X., Roux, P.Teleseismic correlations of ambient seismic noise for deep global imaging of the Earth.Geophysical Journal International, Vol. 194, 2, pp. 844-848.MantleGeophysics - seismics
DS1998-1296
1998
Poli, S.Schmidt, M.W., Poli, S.Experimentally based water budgets for dehydrating slabs and sequences for arc magmas generation.Earth and Planetary Science Letters, Vol. 163, No. 1-4, Nov. pp. 361-379.MantleMagmas, Slabs
DS2002-1274
2002
Poli, S.Poli, S., Schmidt, M.W.Petrology of subducted slabsAnnual of Review Earth Planetary Science, Vol.30,pp. 207-235.MantleSubduction
DS2002-1275
2002
Poli, S.Poli, S., Schmidt, M.W.Petrology of subducted slabsAnnual Review of Earth and Planetary Sciences, Vol.30,pp. 207-235.MantleSubduction
DS2003-1095
2003
Poli, S.Poli, S., Schmidt, M.W.Petrology of subducted slabsAnnual Review of Earth and Planetary Sciences, Vol. 30, 29p.GlobalSubduction
DS200412-1350
2004
Poli, S.Molina, J.F., Poli, S., Austrheim, J., Glodny, J., Rusin, A.Eclogite facies vein systems in the Marun-Keu complex ( Polar Urals, Russia): textural, chemical, thermal constraints for patterContributions to Mineralogy and Petrology, Vol. 147, 4, pp. 484-504.Russia, UralsEclogite
DS200612-1100
2006
Poli, S.Poli, S., Molina, J-F., Franzolin, E.Fe Mg Ca partitioning between carbonates, garnet and clinopyroxene at high pressure: experimental constraints in mafic systems up to 6 GPa.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p.TechnologyEclogite, carbonatite
DS200912-0469
2009
Poli, S.Malaspina, N., Poli, S., Fumagalli, P.The oxidation state of metasomatized mantle wedge: insights from COH-bearing garnet peridotite.Journal of Petrology, Vol. 50, 8, pp. 1533-1552.MantleMetasomatism
DS200912-0779
2009
Poli, S.Tumiati, S., Fumagalli, P., Poli, S.Carbonate silicate equilibration temperatures in upper mantle peridotites saturated with C O H fluids.Goldschmidt Conference 2009, p. A1352 Abstract.MantleSubduction
DS201112-0635
2010
Poli, S.Malaspina, N., Scambelluri, M., Poli, S., Van Roermund, H.L.M., Langenhorst, F.The oxidation state of mantle wedge majoritic garnet websterites metasomatised by C-bearing subduction fluids.Earth and Planetary Science Letters, Vol. 298, 3-4, pp. 417-426.MantleMetasomatism
DS201212-0433
2012
Poli, S.Malaspina, N., Langenhorst, F., Fumagalli, P., Tumiati, S., Poli, S.Fe 3+ distribution between garnet and pyroxenes in mantle wedge carbonate bearing garnet peridotites ( Sulu, China) and implications for their oxidation state.Lithos, Vol. 146-147, pp. 11-17.ChinaUHP
DS201212-0434
2012
Poli, S.Malaspina, N., Langenhorst, F., Fumagalli, P., Tumiati, S., Poli, S.Fe 3 + distribution between garnet and pyroxenes in mantle wedge carbonate bearing garnet peridotites ( Sulu China) and implications for their oxidation state.Lithos, Vol. 146-147, pp. 11-17.ChinaUHP
DS201212-0435
2012
Poli, S.Malaspina, N., Langenhorst, F., Poli, S.C-O-H metasomatism and redox processes in the mantle at subduction zones.emc2012 @ uni-frankfurt.de, 1p. AbstractChinaSulu area
DS201212-0564
2012
Poli, S.Poli, S.Carbonatites out of a subducted altered oceanic crust? New experimental evidences for "low temperature" carbonatitic melts in COH bearing gabbros at 3.8-4.2 Gpa.emc2012 @ uni-frankfurt.de, 1p. AbstractTechnologyCarbonatite, subduction
DS201312-0715
2013
Poli, S.Poli, S.Carbonatites out of a subducted altered oceanic crust? Experimental evidences for epidote-dolomite eclogite melting at 3.8-4.2 Gpa.Goldschmidt 2013, AbstractMantleCarbonatite
DS201509-0420
2015
Poli, S.Poli, S.Carbon mobilized at shallow depths in subduction zones by carbonatitic liquids.Nature Geoscience, Vol. 8, pp. 633-636.MantleCarbonatite

Abstract: More than half a gigaton of CO2 is subducted into Earth’s interior each year1. At least 40% of this CO2 is returned to the atmosphere by arc volcanism2, 3, 4. Processes that are known to release carbon from subducting slabs—decarbonation or carbonate dissolution in fluids—can account for only a portion of the CO2 released at arc volcanoes5. Carbonatitic liquids may form from the subducting crust, but are thought to form only at very high temperatures. Melting of carbonated rocks could restrict the subduction of carbon into the deeper Earth. However, the behaviour of such rock types in subduction zones is unclear. Here I use laboratory experiments to show that calcium-rich hydrous carbonatitic liquids can form at temperatures as low as 870 to 900 °C, which corresponds to shallow depths of just 120 km beneath subduction zone arcs, in warm thermal regimes. I find that water strongly depresses the solidus for hydrous carbonate gabbro and limestone rocks, creating carbonatitic liquids that efficiently scavenge volatile elements, calcium and silicon, from the slab. These extremely mobile and reactive liquids are expected to percolate into the mantle wedge, and create a CO2 source for subduction zone magmatism. Carbonatitic liquids thus provide a potentially significant pathway for carbon recycling at shallow depths beneath arcs.
DS201610-1899
2016
Poli, S.Poli, S.Melting carbonated epidote eclogites: carbonatites from subducting slabs.Progress in Earth and Planetary Science, Vol. 3, 18p.MantleCarbonatite

Abstract: Current knowledge on the solidus temperature for carbonated eclogites suggests that carbonatitic liquids should not form from a subducted oceanic lithosphere at sub-arc depth. However, the oceanic crust includes a range of gabbroic rocks, altered on rifts and transforms, with large amounts of anorthite-rich plagioclase forming epidote on metamorphism. Epidote disappearance with pressure depends on the normative anorthite content of the bulk composition; we therefore expect that altered gabbros might display a much wider pressure range where epidote persists, potentially affecting the solidus relationships. A set of experimental data up to 4.6 GPa, and 1000 °C, including new syntheses on mafic eclogites with 36.8 % normative anorthite, is discussed to unravel the effect of variable bulk and volatile compositions in model eclogites, enriched in the normative anorthite component (An 37 and An 45). Experiments are performed in piston cylinder and multianvil machines. Garnet, clinopyroxene, and coesite form in all syntheses. Lawsonite was found to persist at 3.7 GPa, 750 °C, with both dolomite and magnesite; at 3.8 GPa, 775-800 °C, fluid-saturated conditions, epidote coexists with kyanite, dolomite, and magnesite. The anhydrous assemblage garnet, omphacite, aragonite, and kyanite is found at 4.2 GPa, 850 °C. At 900 °C, a silicate glass of granitoid composition, a carbonatitic precipitate, and Na-carbonate are observed. Precipitates are interpreted as evidence of hydrous carbonatitic liquids at run conditions; these liquids produced are richer in Ca compared to experimental carbonatites from anhydrous experiments, consistently with the dramatic role of H2O in depressing the solidus temperature for CaCO3. The fluid-absent melting of the assemblage epidote + dolomite, enlarged in its pressure stability for An-rich gabbros, is expected to promote the generation of carbonatitic liquids. The subsolidus breakdown of epidote in the presence of carbonates at depths exceeding 120 km provides a major source of C-O-H volatiles at sub-arc depth. In warm subduction zones, the possibility of extracting carbonatitic liquids from a variety of gabbroic rocks and epidosites offers new scenarios on the metasomatic processes in the lithospheric wedge of subduction zones and a new mechanism for recycling carbon.
DS201812-2902
2018
Poli, S.Zhao, S., Schettino, E., Merlini, M., Poli, S.The stability and melting of aragonite: an experimental and thermodynamic model for carbonated eclogites in the mantle.Lithos, doi.org/10.1016/ j.lithos.2018.11.005 38p.Mantleeclogite

Abstract: Subduction of calcium carbonate, sequestered in the oceanic crust by hydrothermal metamorphism and biogenic action, accounts for a significant flux of carbon into the mantle, where it contributes to the genesis of carbonatitic and silica-undersaturated melts. However, the reported phase relations in the system CaCO3, notably the transition boundary from disordered calcite (calcite V, here ccv) to aragonite (ara), vary considerably among different studies. Moreover, the thermodynamic properties of ccv and of liquid CaCO3 (CaCO3L) remain to be determined. In order to address the dearth of experimental data on phase relations, and to determine a set of internally consistent thermodynamic properties for ara, ccv and CaCO3L, multi-anvil experiments were performed at 3-6?GPa and 1300-1750?°C. By re-evaluating all experimental data, the transformation of ccv-ara fits the equation Tccv-ara?=?397.6?+?320.17?×?P and the melting curve Tm?=?1578.9?+?139.65?×?P?-?11.646?×?P2, where pressure is in GPa and temperature in K. Thermodynamic properties retrieved for calcite V and liquid CaCO3 are used to compute phase diagrams of relevance for chemical compositions representative of eclogite heterogeneities of the astenospheric mantle, and compared with experimentally derived phase relationships. Aragonite represents a carbonate of major abundance in carbonated eclogites at high temperature, close to the solidus; its ability to fractionate REE and Ba-Sr contributes to the peculiar geochemical signatures of silica undersaturated magmas. The relatively refractory nature of aragonite impacts on our understanding of the deep carbon cycle.
DS201902-0335
2019
Poli, S.Zhao, S., Schettino, E., Merlini, M., Poli, S.The stability and melting of aragonite: an experimental and thermodynamic model for carbonated eclogites in the mantle.Lithos, Vo.. 324, 1, pp. 105-114.Mantleeclogites

Abstract: Subduction of calcium carbonate, sequestered in the oceanic crust by hydrothermal metamorphism and biogenic action, accounts for a significant flux of carbon into the mantle, where it contributes to the genesis of carbonatitic and silica-undersaturated melts. However, the reported phase relations in the system CaCO3, notably the transition boundary from disordered calcite (calcite V, here ccv) to aragonite (ara), vary considerably among different studies. Moreover, the thermodynamic properties of ccv and of liquid CaCO3 (CaCO3L) remain to be determined. In order to address the dearth of experimental data on phase relations, and to determine a set of internally consistent thermodynamic properties for ara, ccv and CaCO3L, multi-anvil experiments were performed at 3-6?GPa and 1300-1750?°C. By re-evaluating all experimental data, the transformation of ccv-ara fits the equation Tccv-ara?=?397.6?+?320.17?×?P and the melting curve Tm?=?1578.9?+?139.65?×?P?-?11.646?×?P2, where pressure is in GPa and temperature in K. Thermodynamic properties retrieved for calcite V and liquid CaCO3 are used to compute phase diagrams of relevance for chemical compositions representative of eclogite heterogeneities of the astenospheric mantle, and compared with experimentally derived phase relationships. Aragonite represents a carbonate of major abundance in carbonated eclogites at high temperature, close to the solidus; its ability to fractionate REE and Ba-Sr contributes to the peculiar geochemical signatures of silica undersaturated magmas. The relatively refractory nature of aragonite impacts on our understanding of the deep carbon cycle.
DS2001-0151
2001
Poliakov, A.Burov, E., Jolivet, L., LePourhiet, L., Poliakov, A.A thermomechanical model of exhumation of high pressure HP and ultra high pressure UHP metamorphic rocks...Tectonophysics, Vol. 342, No. 2, pp. 113-36.GlobalAlpine type collision belts, UHP
DS2001-0833
2001
Poliakov, A.Nicolas, A., Poliakov, A.Melt migration and mechanical state in the lower crust of oceanic ridgesTerra Nova, Vol. 13, pp. 64-9.MantleMelt migration
DS1994-1390
1994
Poliakov, A.N.B.Podlachikov, Yu.Yu., Poliakov, A.N.B., Yuen, D.A.The effect of lithospheric phase transitions on subsidence of extending continental lithospheres.Earth and Planet. Science Letters, Vol. 124, No. 1-4, June pp. 95-104.MantleSubduction
DS1984-0257
1984
Poliakov, V.P.Eliutin, V.P., Poliakov, V.P., et al.Investigation of the Process of Polycrystalline Diamond Formation.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 275, No. 1, PP. 135-139.RussiaMineralogy
DS1990-1192
1990
Poliakov, V.P.Poliakov, V.P., Eliutin, V.P., et al.Effect of the growth system geometry on the morphology of diamondcrystal.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 311, No. 4, pp. 870-873RussiaCrystallography, Diamond morphology
DS201807-1478
2018
Polianichko, V.Bournas, N., Prikhodko, A., Plastow, G., Legault, J., Polianichko, V., Treshchev, S.Exploring for kimberlite pipes in the Cuango area, Angola using helicopter-borne EM survey.AEM2018/7th International Workshop on Airborne electromagnetics, Held June 17-20, 4p.Africa, Angolageophysics - TEM
DS201212-0565
2012
Poliannikov, O.V.Poliannikov, O.V., Rondenay, S., Chen, L.Interfeometric imaging of the underside of a subduction crust.Geophysical Journal International, in press availableMantleSubduction
DS1995-0170
1995
Polikashina, N.S.Boriskenko, L.F., Polikashina, N.S.Titanium in weathering crusts and related alluvial placersLithology and Mineral resources, No. 1, pp. 46-54Russia, UkraineAlluvials, Laterites
DS1920-0462
1929
Polinard, E.Polinard, E.Les Diamants Translucides et Opaques des Gisements de la Bushimaie.Soc. Geol. (belge) Annual, Vol. 52, PP. 197-218.Democratic Republic of Congo, Central AfricaDiamonds, Translucent, Opaque, Bushmanland
DS1930-0037
1930
Polinard, E.Polinard, E.Les Gisements Diamantiferes des Collines de Bakwanga Divindji sur la Bushimaie.International CONGRESS Mines 6TH., Vol. 1, PP. 25-42.Democratic Republic of Congo, Central AfricaDiamond Occurrences
DS1930-0038
1930
Polinard, E.Polinard, E.Les Diamants Transparents des Gisements de la BushimaieSoc. Geol. Belge Annual, Vol. 53, No. 1, PP. C1-C33.Democratic Republic of Congo, Central AfricaDiamonds
DS1930-0039
1930
Polinard, E.Polinard, E.Le Diamant dans Les Roches Genetiques et dans Les Gisementssecondaires.International CONGRESS Mines 6TH., Vol. 1, PP. 5-12.Democratic Republic of Congo, Central AfricaMineralogy, Genesis
DS1930-0075
1931
Polinard, E.Polinard, E.Les Deformations Exterieures, Les Proprietes Internes et Les Modalities de la Cristallisation des Diamants de la Bushimaie.Acad. Roy. Belge Bulletin. De la Classe Des Sciences, SER. 5, Vol. 17, No. 1, PP. 137-162.Democratic Republic of Congo, Central AfricaCrystallography, Genesis, Diamonds
DS1930-0076
1931
Polinard, E.Polinard, E.Les Diamants En Agglomeration de Cristaux et Les Diamants Acristallisation Confuse de Gisements de la Bushimaie.Soc. Geol. Belge Annual Bulletin., Vol. 54, PP. C 1-C22.Democratic Republic of Congo, Central AfricaCystallography
DS1930-0119
1932
Polinard, E.Polinard, E.Les Formes Cristallines des Diamants de L'oubangui-chariSoc. Min. (france) Bulletin., Vol. 55, No. 7-8, PP. 213-235.West Africa, French Equatorial Africa, Central African RepublicCrystallography, Diamond
DS1930-0148
1933
Polinard, E.Polinard, E.Les Gisements Diamantiferous et Accessoirement Auriferes Dela Region de Bria En Oubangui-chari.Soc. Geol. (belge) Annual, Vol. 57, PP. C65-85.West Africa, French Equatorial Africa, Central African RepublicDiamond Deposits, Gold
DS1930-0174
1934
Polinard, E.Polinard, E.Les Champs Diamantiferes du CongoAssociation POUR LE PERFECT DU MATERIEL COL. Bulletin., No. 4, PP. 3-32.Democratic Republic of Congo, Central AfricaDiamond Fields
DS1950-0038
1950
Polinard, E.Polinard, E.Sur Une Forme Tetraedrique du DiamantGeological Society BELGE Annual, Vol. 74, PT. B, No. 1-3, PP. 59-63.Democratic Republic of Congo, Central AfricaCrystallography, Diamond
DS1992-1215
1992
Poling, G.Poling, G.Bulk samplingNorthwest Territories Geoscience Forum held November 25, 26th. 1992, Poster, AbstractNorthwest TerritoriesSampling, Bulk sampling, laboratory
DS1990-1529
1990
Poling, G.W.Waldman, M.A., Poling, G.W.North America's only large capacity diamond recovery plantDia Met Handout, Prospectors and Developers Association of Canada (PDAC) Meeting, Held March, 6pColoradoDiamond recovery plant, Overview
DS1991-1364
1991
Poling, G.W.Poling, G.W., Waldman, M.A.Dia Met's diamond recovery pilot plant in ColoradoThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) ., Session on Diamonds at The Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Annual Meeting April, Vol. 84, No. 947, March p. 99. AbstractColoradoDiamond recovery, Mining applications-processing
DS1992-1216
1992
Poling, G.W.Poling, G.W., Waldman, M.A.Dia Met Minerals' diamond recovery pilot plant in ColoradoThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin), Vol. 85, No. 956, January pp. 72-83ColoradoDiamond processing, Diamond recovery - example
DS1993-1248
1993
Poling, G.W.Poling, G.W.Diamond recovery processesThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) , Annual Meeting Abstracts LESS than approximately 10, Vol. 86, No. 968, March ABSTRACT p. 75.Northwest TerritoriesMineral processing, Evaluation, economics
DS1997-0990
1997
Poling, G.W.Rylatt, M.G., Poling, G.W., Popplewell, G.The northwest Territories diamonds project - diamond processing in the Canadian arcticThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) ., Vol. 90, No. 1015, Nov-Dec. p. 33.(paper 24p.)Northwest TerritoriesMineral processing, Deposit - Ektaki
DS2003-1096
2003
Poling, G.W.Poling, G.W., Ashley, R.M.The discovery of EKATI, roles of the Dia Met BHP joint ventureGeological Association of Canada Annual Meeting, Abstract onlyNorthwest TerritoriesHistory - Dia Met
DS200412-1567
2003
Poling, G.W.Poling, G.W., Ashley, R.M.The discovery of EKATI, roles of the Dia Met BHP joint venture.Geological Association of Canada Annual Meeting, Abstract onlyCanada, Northwest TerritoriesHistory - Dia Met
DS1991-0140
1991
Politiuk, V.I.Bogdanov, E.I., Politiuk, V.I.Alluvial mining in the USSRAlluvial Mining, Institute of Mining and Metallurgy (IMM) Special Volume, pp. 1-18RussiaAlluvial mining, Placers - not specific to diamonds
DS200612-1585
2006
Politov, A.A.Zegrenizov, D.A., Harte, B., Shatsky, V.S., Politov, A.A., Rylov, G.M., Sobolev, N.V.Directional chemical variations in diamonds showing octahedral following cuboid growth.Contributions to Mineralogy and Petrology, Vol. 151, 1, Jan. pp. 45-57.Russia, YakutiaMineral chemistry, subduction
DS1991-1365
1991
Politz, F.F.Politz, F.F.Two stage model of African absolute motion during the last 30 millionyearsTectonophysics, Vol. 194, No. 1-2, pp. 91-106AfricaTectonics, Geochronology
DS200812-1163
2008
Politz, F.F.Thatcher, W., Politz, F.F.Temporal evolution of continental lithospheric strength in actively deforming regions.GSA Today, Vol. 18, 4, April pp. 4-11.United StatesTectonics
DS1960-1232
1969
Polkanov, YU.A.Yeremenko, G.K., Polkanov, YU.A.Luminescence of Small Diamonds from Sandy Sediments of the Ukraine.Doklady Academy of Science USSR, Earth Science Section., Vol. 188, No. 4, PP. 149-151.RussiaKimberlite, Photoluminescence, Colour
DS1970-0175
1970
Polkanov, YU.A.Polkanov, YU.A., Yeremenko, G.K.Diamond Potential of the Southwest Margin of the Russian Platform.Kiev:, RussiaKimberlite, Kimberley
DS1970-0858
1973
Polkanov, YU.A.York, YU.YU., Kashkarov, I.F., Polkanov, YU.A., Eremenko, G.K.Small (sand Size) Diamonds of the UkraineKiev: Izdat Naikova Dumka., 167P.Russia, UkraineKimberlite, Diamond, Kimberley
DS1980-0059
1980
Polkanov, YU.A.Belimenko, L.D., Polkanov, YU.A., Samoylovich, M.I.Electron Microscopic Research on Diamonds from Titaniferous placers on the Russian PlatformTsnigri, No. 153, PP. 36-43.RussiaBlank
DS1980-0189
1980
Polkanov, YU.A.Kirikilitsa, S.I., Polkanov, YU.A., Khrenov, A.YA.The Morphology and Luminescent Properties of Small Diamonds from Placers in Kazakhstan and Western Siberia.Tsnigri, No. 153, PP. 29-31.RussiaBlank
DS1986-0443
1986
Polkanov, Yu.A.Kirikilitsa, S.I., Polkanov, Yu.A.Crystal morphology and structural characteristics of diamonds of different genetic type.(Russian)Mineral. Kristallogr. I EE Prim. V. Prakt. Geol. Kiev (Russian), Vol. 1986 pp. 122-132RussiaBlank
DS1986-0444
1986
Polkanov, Yu.A.Kirikiltsa, S.I., Polkanov, Yu.A.Crystal structure of genetically different diamonds.(Russian)In: Mineralogical crystallography and its application mineral, pp. 122-132RussiaDiamond morphology
DS1994-1394
1994
Polkanov, Yu.A.Polkanov, Yu.A.Fine grained placers:the problem of diamondiferousness and the key to discovery of new genetic types -diamond.Russian Acad. of Sciences, Placers and weathered rock, Nov. 2p.RussiaDiamonds, Placers, alluvials
DS1960-0589
1965
Pollack, D.W.Pollack, D.W.The Potash Sulfur Springs Alkali Complex, Garland County, ArkansasMining Engineering, Vol. 17, PP. 45-46. (abstract.).United States, Gulf Coast, Arkansas, Garland CountyBlank
DS1975-0485
1977
Pollack, H.N.Cowan, I.M., Pollack, H.N.Gravity in ZambiaNature., Vol. 266, PP. 615-617.GlobalGeophysics, Regional Tectonics
DS1987-0026
1987
Pollack, H.N.Ballard, S., Pollack, H.N.Diversion of heat by Archean cratons: a model for southern AfricaEarth and Planetary Science Letters, Vol. 85, No. 1-3, September pp. 253-264South AfricaCraton, Heat flow
DS1987-0027
1987
Pollack, H.N.Ballard, S., Pollack, H.N., Skinner, N.J.Terrestrial heat flow in Botswana and NamibiaJournal of Geophysical Research, Vol. 92, No. B7, June 10, pp. 6291-6300.GlobalLithosphere, Archean, Heat flow data
DS1988-0036
1988
Pollack, H.N.Ballard, S., Pollack, H.N.Modern and ancient geotherms beneath Southern AfricaEarth and Planetary Science Letters, Vol. 88, No. 1-2, April pp. 132-142AfricaBlank
DS1990-1125
1990
Pollack, H.N.Nyblade, A.A., Pollack, H.N., Jones, D.L., Podmore, F.Terrestrial heat flow in east and southern AfricaJournal of Geophysical Research, Vol. 95, No. B 11, October 10, pp. 17371-17384South AfricaHeat Flow, Mantle
DS1993-1148
1993
Pollack, H.N.Nyblade, A.A., Pollack, H.N.Can differences in heat flow between east and southern Africa be easilyinterpreted? Implications for understanding regional variability in continentalheatTectonophysics, Vol. 219, pp. 257-272South AfricaHeat Flow, Craton, Archean, Tanzanian, Mozambique Belt
DS1993-1149
1993
Pollack, H.N.Nyblade, A.A., Pollack, H.N.A comparative study of parameterized and full thermal convection models In the interpretation of heat flow from cratons and mobile belts.Geophysical Journal International, Vol. 113, pp. 747-751.South AfricaKalahari Craton, Lithosphere
DS1993-1249
1993
Pollack, H.N.Pollack, H.N., Hurter, S.J., Johnson, J.R.Heat flow from the earth's interior: analysis of the global dat a setReviews of Geophysics, Vol. 31, No. 3, August pp. 267-280.MantleGeophsyics, Lithosphere
DS1993-1250
1993
Pollack, H.N.Pollack, H.N., Hurterm S.J., Johnson, J.R.Heat flow from the earth's interior: analysis of the global dat a setReviews of Geophysics, Vol. 31, No. 3, August pp. 267-280GlobalGeophysics, Mantle, Heat Flow
DS200412-1568
1977
Pollack, H.N.Pollack, H.N.On the regional variation of heat flow, geotherms and lithospheric thickness.Tectonophysics, Vol. 38, pp. 279-296.MantleGeothermometry
DS1975-0164
1975
Pollak, I.Pollak, I.The World of the DiamondHicksville, N.y.: Exposition Press, 127P.GlobalKimberlite, Kimberley
DS200512-0863
2005
Pollard, D.Pollard, D., Keating, J.F.Snowball Earth: a thin ice solution with flowing sea glaciers.Journal of Geophysical Research, Bol. 110, C7, C7010Geomorphology
DS1981-0135
1981
Pollard, D.D.Delaney, P.T., Pollard, D.D.Deformation of Host Rocks and Flow of Magma During Growth Of Minette Dikes and Breccia- Bearing Intrusions Near Ship Rock, New Mexico.United States Geological Survey (USGS) PROF. PAPER., No. 1202, 61P.United States, New Mexico, Colorado PlateauKimberlite, Diatreme, Colorado Plateau, Rocky Mountains
DS1950-0150
1953
Pollard, E.R.Pollard, E.R.The Diamond and Gold Deposits of the Mekuru District Cuyuni RiverBritish Guiana Geological Survey, Bulletin. 24, 25p.GlobalDiamond Occurrences
DS1950-0348
1957
Pollard, E.R.Pollard, E.R., Dixon, C.G., Dujardin, R.A.Diamond Resources of British GuianaBritish Guiana Geological Survey, Bulletin. 28, 43p.GlobalDiamond Occurrences
DS1986-0049
1986
Pollard, H.N.Ballard, S.III., Pollard, H.N.Present day heat flow and thermobarometry of ancient diamonds:implications for diversion of heat by archean cratonsEos, Vol. 67, No. 44, Nov. 4, p. 1183. (abstract.)GlobalMantle, Thermobarometry
DS1996-1407
1996
Pollard, P.J.Taylor, R.P., Pollard, P.J.Rare earth mineralization in peralkaline systems: the T zone rare earth elements (REE) Yttrium, Berylium deposit, Thor Lake, northwest Territories.Mineralogical Soc. Series, No. 7, pp. 167-192.Northwest TerritoriesRare earth minerals, Yttrium, Berylium, Deposit -Thor Lake
DS200512-0864
2005
Poller, U.Poller, U., Gladkochub, D., Donskaya, T., Mazukabzov, A., Sklyarov, E., Todt, W.Multistage magmatic and metamorphic evolution in the southern Siberian craton: Archean and paleoproterozoic zircon ages revealed by SHRIMP and TIMS.Precambrian Research, Vol. 136, 3-4, pp. 353-368.Russia, SiberiaGeochronology
DS200512-0865
2005
Poller, U.Poller, U., Gladkochub, D.P., Donskaya, T.V., Mazukabzov, A.M., Sklyarov, E.V., Todt, W.Timing of Early Proterozoic magmatism along the southern margin of the Siberian Craton ( Kitoy area).Geological Society of America Special Paper, No. 389, pp. 215-226.RussiaMagmatism ( not specific to diamonds)
DS200912-0182
2009
Poller, U.Donskaya, T.V., Gladkochub, D.P., Pisarevsky, S.A., Poller, U., Mazukabov, A.M., Bayanova, T.B.Discovery of Archean crust within the Akitkan orogenic belt of the Siberian craton: new insight into its architecture and history.Precambrian Research, Vol. 170, 1-2, pp. 61-72.Russia, SiberiaTectonics
DS1930-0260
1937
Pollett, J.D.Pollett, J.D.The Diamond Deposits of Sierra LeoneImp. Institute Bulletin., Vol. 35, No. 3, PP. 333-348.Sierra Leone, West Africa, Kono, Nimini, GoriGeology, Kimberlite History, Prospecting, Diamond Mining Recovery
DS1950-0080
1951
Pollett, J.D.Pollett, J.D.The Geology and Mineral Resources of Sierra Leone (1951)Colon. Geol. Min. Res., Vol. 2, No. 1, PP. 3-28.Sierra Leone, West AfricaGeology, Diamonds
DS1950-0233
1955
Pollett, J.D.Pollett, J.D.The Geology and Mineral Resources of Sierra Leone (1955)Geological Survey SIERRA LEONE Annual Report, FOR 1953Sierra Leone, West AfricaDiamonds, Geology
DS201012-0591
2010
Pollington, A.D.Pollington, A.D., Baxter, E.F.High resolution Sm Nd garnet geochronology reveals the uneven pace of tectonomorphic processes.Earth and Planetary Science Letters, Vol. 293, 1-2, pp. 63-71.MantleGeochronology
DS201312-0716
2014
Pollitiz, F.F.Pollitiz, F.F., Mooney, W.D.Seismic structure of the central US crust and shallow upper mantle: uniqueness of the Reelfoot Rift.Earth and Planetary Science Letters, Vol. 402, pp. 157-166.United StatesGeophysics - seismics
DS2003-1421
2003
Pollitz, F.Vergnolle, M., Pollitz, F., Calais, E.Constraints on the viscosity of the continental crust and mantle from GPS measurementsJournal of Geophysical Research, Vol. 108, B10, 2502 DOI. 1029/2002JB002374Mongolia, AsiaGeophysics - siesmics, GPS
DS2003-1422
2003
Pollitz, F.Vergnolle, M., Pollitz, F., Calasi, E.Constraints on the viscosity of the continental crust and mantle from GPS measurementsJournal of Geophysical Research, Vol. 108, 10, ETG 15 10.1029/2002JB002374MongoliaGeophysics - seismics
DS200412-2053
2003
Pollitz, F.Vergnolle, M., Pollitz, F., Calasi, E.Constraints on the viscosity of the continental crust and mantle from GPS measurements and postseismic deformation models in wesJournal of Geophysical Research, Vol. 108, 10, ETG 15 10.1029/2002 JB002374Asia, MongoliaGeophysics - seismics
DS201112-0750
2011
Pollitz, F.Obrebski, M., Allen, R.M., Pollitz, F., Hung, S-H.Lithosphere asthenosphere interaction beneath the western United States from the joint inversion of body-wave traveltimes and surface wave phase veolocities.Geophysical Journal International, March 25, In press availableUnited StatesGeophysics - seismics
DS1999-0562
1999
Pollitz, F.F.Pollitz, F.F.Earth sciences: from rifting to driftingNature, Vol. 398, No. 6722, Mar. 4, p. 21.GlobalTectonics, Continental Drift
DS201412-0701
2014
Pollitz, F.F.Pollitz, F.F., Mooney, W.D.Seismic structure of the central US crust and shallow upper mantle: uniqueness of the Reelfoot Rift.Earth and Planetary Science Letters, Vol. 402, pp. 157-166.United StatesGeophysics - seismics
DS201603-0412
2016
Pollitz, F.F.Pollitz, F.F., Mooney, W.D.Seismic velocity structure of the crust and shallow mantle of the central and eastern United States by seismic surface wave imaging.Geophysical Research Letters, Vol. 43, 1, pp. 118-126.United StatesGeophysics - seismics
DS201810-2357
2018
Pollock, K.Moss, S.W., Kobussen, A., Powell, W., Pollock, K.Kimberlite emplacement and mantle sampling through time at A154N kimberlite volcano, Diavik Diamond mine: lessons from the deep.Mineralogy and Petrology, doi.org/10.1007/ s00710-018-0630-7 14p.Canada, Northwest Territoriesdeposit - Diavik

Abstract: The Diavik Diamond Mine in the NWT of Canada has produced in excess of 100 million carats from 3 kimberlite pipes since mining commenced in 2002. Here, we present new findings from deep (>400 m below surface) mining, sampling and drilling work in the A154N kimberlite volcano that require a revision of previous geological and emplacement models and provide a window into how the sub-continental lithospheric mantle (SCLM) below Diavik was sampled by kimberlite magmas through time. Updated internal geological models feature two volcanic packages interpreted to represent two successive cycles of explosive eruption followed by active and passive sedimentation from a presumed crater-rim, both preceded and followed by intrusions of coherent kimberlite. Contact relationships apparent among the geological units allow for a sequential organization of as many as five temporally-discrete emplacement events. Representative populations of mantle minerals extracted from geological units corresponding to four of the emplacement events at A154N are analyzed for major and trace elements, and provide insights into the whether or not kimberlites randomly sample from the mantle. Two independent geothermometers using clinopyroxene and garnet data indicate similar source depths for clinopyroxenes and G9 garnets (130-160 km), and suggest deeper sampling with time for both clinopyroxene and garnets. Harzburgite is limited to 110-160 km, and appears more prevalent in early, low-volume events. Variable ratios of garnet parageneses from the same depth horizons suggest random sampling by passing magmas, but deeper garnet sampling through time suggests early preferential sampling of shallow/depleted SCLM. Evaluations of Ti, Zr, Y and Ga over the range of estimated depths support models of the SCLM underlying the central Slave terrane.
DS201812-2852
2018
Pollock, K.Moss, S., Porritt, L., Pollock, K., Fomradas, G., Stubley, M., Eichenberg, D., Cutts, J.Diavik deposit: Geology, mineral chemistry, and structure of the kimberlites at Diavik diamond mine: indicators of cluster-scale cross-fertilization, mantle provenance, and pipe morphology.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 287-318.Canada, Northwest Territoriesdeposit - Diavik
DS201812-2868
2018
Pollock, K.Pollock, K., Davy, A.T., Moss, S.Diavik deposit: Evaluation of the Diavik diamond deposit.Society of Economic Geology Geoscience and Exploration of the Argyle, Bunder, Diavik, and Murowa Diamond Deposits, Special Publication no. 20, pp. 267-286.Canada, Northwest Territoriesdeposit - Diavik
DS1996-1127
1996
Pollock, S.H.Pollock, S.H., Henry, J.J.Mineral extraction and United Kingdom policies for sustainabledevelopmentMinerals Industry International, January pp. 13-16GlobalEconomics, Sustainability
DS1987-0590
1987
Pollock, S.J.Pollock, S.J.The isotopic geochemistry of the Prairies Lake carbonatite complexMsc. Thesis Carleton University, 71p. QE 438 P777 Ontario Geological Survey (OGS)OntarioCarbonatite
DS1987-0591
1987
Pollock, S.P.Pollock, S.P.The isotopic geochemistry of the Prairies Lake carbonatite complex, OntarioMsc. Thesis Carleton University, No pages givenOntarioCarbonatite, Prairie Lake
DS1990-0482
1990
PolloniFolger, D.W., Irwin, B.J., McCullough, J.R., Rowland, R.W., PolloniMap showing free-air gravity anomalies off the southern coast of west-central Africa; Liberia to GhanaUnited States Geological Survey (USGS) Map, MF 2098-E, 1: 500, 000 $ 1.50GlobalGeophysics -gravity, Coast
DS1990-0483
1990
PolloniFolger, D.W., Irwin, B.J., McCullough, J.R., Rowland, R.W., PolloniMap showing free air gravity anomalies off the southern coast of west central Africa: Liberia to GhanaUnited States Geological Survey (USGS) Map, No. MF-2098-E 1: 500, 000 $ 1.50West AfricaGravity, Map, Geophysics
DS201903-0541
2019
Polo, L.Roverato, M., Giordano, D., Giovanardi, T., Juliani, C., Polo, L.The 2.0-1.88 Ga Paleoproterozoic evolution of the southern Amazonian Craton ( Brazil): an interpretation inferred by lithofaciological, geochemical and geochronological data.Gondwana Research, Vol. 70, pp. 1-24. doi:10.1016/ j.gr.2018.12.005South America, Brazilcraton

Abstract: The study of Paleoproterozoic rocks is crucial for understanding Earth's tectonic evolution during the time when most of the modern crust and ore deposits were formed. The rocks of the Brazilian Amazonian Craton record some of the most-complete and best-preserved Paleoproterozoic magmatic and volcanic episodes on Earth. Following previous investigations, we present new lithofaciological and stratigraphic records of the felsic rocks of the Tapajós Mineral Province (TMP) (~2-1.88?Ga) and the São Felix do Xingú region (SFX) (~1.88?Ga) which, combined with new petrological and geochronological data, help providing a more complete understanding of the tectonic, magmatic and volcanological evolution of the Amazonian Craton. This magmatism/volcanism is thought to be formed in a late-/post-orogenic to extentional regime confirmed by the new geochemical data presented here. The transition from late-convergent to extensional tectonic setting could register the beginning of the taphrogenesis that marked the Amazonian Craton throughout the Mesoproterozoic. The volcanological approach of this contribution can serve as a strategy for the modelling of the evolution of Precambrian volcano-sedimentary basins around the world. The large amount of rocks analyzed are divided into primary and secondary volcaniclastic products depending on if they resulted from a direct volcanic activity (pyroclastic) or processes that reworked pyroclastic fragments. Furthermore, the deposits are subdivided into massive and stratified, depending on their primary mechanisms of transport and emplacement. By confirming the results from previous studies, our study permits to depict a more precise paleo-environmental picture of the processes that occurred in the Amazonian Craton during the Late-Paleoproterozoic. In particular, the presence of large regional-scale fissural systems and caldera collapses produced large silicic explosive volcanic eruptions, also accompanied by the emission of large volume effusive products. Although studies on the Amazonian Craton are still scarce and controversial, the present study provides new evidence that this volcanism may have formed one of the largest Silicic Large Igneous Provinces (SLIP) on earth. Our data also confirm that at least two major Paleoproterozoic periods of formation of volcanic rocks exist in the Amazonian craton. This point is of great relevance for any future interpretation of the geological evolution of this craton.
DS201905-1074
2019
Polo, L.Roverato, M., Giordano, D., Giovanardi, T., Juliani, C., Polo, L.The 2.0-1.88 Ga Paleoproterozoic evolution of the southern Amazonian Craton ( Brazil): an interpretation inferred by lithofaciological, geochemical and geochronological data.Gondwana Research, Vol. 70, pp. 1-24.South America, Brazilcraton

Abstract: The study of Paleoproterozoic rocks is crucial for understanding Earth's tectonic evolution during the time when most of the modern crust and ore deposits were formed. The rocks of the Brazilian Amazonian Craton record some of the most-complete and best-preserved Paleoproterozoic magmatic and volcanic episodes on Earth. Following previous investigations, we present new lithofaciological and stratigraphic records of the felsic rocks of the Tapajós Mineral Province (TMP) (~2-1.88?Ga) and the São Felix do Xingú region (SFX) (~1.88?Ga) which, combined with new petrological and geochronological data, help providing a more complete understanding of the tectonic, magmatic and volcanological evolution of the Amazonian Craton. This magmatism/volcanism is thought to be formed in a late-/post-orogenic to extentional regime confirmed by the new geochemical data presented here. The transition from late-convergent to extensional tectonic setting could register the beginning of the taphrogenesis that marked the Amazonian Craton throughout the Mesoproterozoic. The volcanological approach of this contribution can serve as a strategy for the modelling of the evolution of Precambrian volcano-sedimentary basins around the world. The large amount of rocks analyzed are divided into primary and secondary volcaniclastic products depending on if they resulted from a direct volcanic activity (pyroclastic) or processes that reworked pyroclastic fragments. Furthermore, the deposits are subdivided into massive and stratified, depending on their primary mechanisms of transport and emplacement. By confirming the results from previous studies, our study permits to depict a more precise paleo-environmental picture of the processes that occurred in the Amazonian Craton during the Late-Paleoproterozoic. In particular, the presence of large regional-scale fissural systems and caldera collapses produced large silicic explosive volcanic eruptions, also accompanied by the emission of large volume effusive products. Although studies on the Amazonian Craton are still scarce and controversial, the present study provides new evidence that this volcanism may have formed one of the largest Silicic Large Igneous Provinces (SLIP) on earth. Our data also confirm that at least two major Paleoproterozoic periods of formation of volcanic rocks exist in the Amazonian craton. This point is of great relevance for any future interpretation of the geological evolution of this craton.
DS201908-1808
2019
Polo, L.Roverato, M., Giordano, D., Giovanardi, T., Juliani, C., Polo, L.The 2.0-1.88 Ga Paleoproterozoic evolution of the southern Amazonian craton ( Brazil): an interpretation inferred by lithofaciological, geochemical and geochronological data.Gondwana Research, Vol. 70, pp. 1-24.South America, Braziltectonics

Abstract: The study of Paleoproterozoic rocks is crucial for understanding Earth's tectonic evolution during the time when most of the modern crust and ore deposits were formed. The rocks of the Brazilian Amazonian Craton record some of the most-complete and best-preserved Paleoproterozoic magmatic and volcanic episodes on Earth. Following previous investigations, we present new lithofaciological and stratigraphic records of the felsic rocks of the Tapajós Mineral Province (TMP) (~2-1.88?Ga) and the São Felix do Xingú region (SFX) (~1.88?Ga) which, combined with new petrological and geochronological data, help providing a more complete understanding of the tectonic, magmatic and volcanological evolution of the Amazonian Craton. This magmatism/volcanism is thought to be formed in a late-/post-orogenic to extentional regime confirmed by the new geochemical data presented here. The transition from late-convergent to extensional tectonic setting could register the beginning of the taphrogenesis that marked the Amazonian Craton throughout the Mesoproterozoic. The volcanological approach of this contribution can serve as a strategy for the modelling of the evolution of Precambrian volcano-sedimentary basins around the world. The large amount of rocks analyzed are divided into primary and secondary volcaniclastic products depending on if they resulted from a direct volcanic activity (pyroclastic) or processes that reworked pyroclastic fragments. Furthermore, the deposits are subdivided into massive and stratified, depending on their primary mechanisms of transport and emplacement. By confirming the results from previous studies, our study permits to depict a more precise paleo-environmental picture of the processes that occurred in the Amazonian Craton during the Late-Paleoproterozoic. In particular, the presence of large regional-scale fissural systems and caldera collapses produced large silicic explosive volcanic eruptions, also accompanied by the emission of large volume effusive products. Although studies on the Amazonian Craton are still scarce and controversial, the present study provides new evidence that this volcanism may have formed one of the largest Silicic Large Igneous Provinces (SLIP) on earth. Our data also confirm that at least two major Paleoproterozoic periods of formation of volcanic rocks exist in the Amazonian craton. This point is of great relevance for any future interpretation of the geological evolution of this craton.
DS202101-0037
2020
Polonia, A.Vannucchi, P., Morgan, J.P., Polonia, A., Molli, G.The life cycle of subcontinental peridotites: from rifted continental margins to mountains via subduction processes.Geology, Vol. 48, pp. 1154-1158. pdfMantlesubduction

Abstract: Serpentinization greatly affects the physical and chemical properties of lithospheric mantle. Here we address the fate of serpentinized peridotites and their influence over an entire Wilson cycle. We document the near-surface journey of serpentinized subcontinental peridotites exhumed during rifting and continental breakup, reactivated as buoyant material during subduction, and ultimately emplaced as "ophiolite-like" fragments within orogenic belts. This life cycle is particularly well documented in former Tethys margins, where recent studies describe the ongoing incorporation of Mesozoic serpentinized subcontinental peridotites that diapirically rise from a subducting lower plate’s mantle to be emplaced into the accretionary prism in front of a continental arc. This newly recognized mode of subduction-linked serpentine diapirism from the downgoing lithospheric slab is consistent with the origin of some exhumed serpentinized subcontinental peridotites in the Apennines (Italy), these assemblages reaching their present locations during Alpine orogenesis. Transfer of serpentinized subcontinental peridotites from the downgoing to the overriding plate motivates the concept of a potentially "leaky" subduction channel. Weak serpentine bodies may in fact rise into, preferentially migrate within, and eventually leave the intraplate shear zone, leading to strong lateral heterogeneities in its composition and mechanical strength.
DS201012-0403
2010
Polozov, A.Kopylova, M., Polozov, A.Petrography of kimberlites and mantle xenoliths: solid foundation or slippery ground?38th. Geoscience Forum Northwest Territories, Abstract pp. 58-59.Canada, Northwest TerritoriesDeposit - Gahcho Kue 5034
DS200812-0432
2008
Polozov, A.C.Grishina, S.N., Polozov, A.C., Mazurov, M.P., Titov, A.T.Origin of chloride xenoliths of Udachnaya East kimberlite pipe, Siberia: evidence from fluid and saline melt inclusions.9IKC.com, 3p. extended abstractRussia, SiberiaDeposit - Udcahnaya inclusions
DS200812-0907
2008
Polozov, A.C.Polozov, A.C., Sukhov, S.S., Gornova, M.A., Grishina, S.N.Salts from Udachnaya East kimberlite pipe ( Yakutia, Russia): occurrences and mineral composition.9IKC.com, 3p. extended abstractRussiaDeposit - Udachnaya
DS200812-0908
2008
Polozov, A.C.Polozov, A.C., Sveneen, H., Planke, S.Chlorine isotopes of salts xenoliths from Udachnaya East kimberlite pipe, Russia.9IKC.com, 3p. extended abstractRussiaDeposit - Udachnaya
DS1990-1525
1990
Polozov, A.G.Vorontosov, A.E., Polozov, A.G., Kostrovitskii, S.I., Bobrov, I.D.On the geochemistry of nickel and Co in post magmatic magnetites fromkimberlites.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 311, No. 1, pp. 179-182RussiaGeochemistry, Magnetites-kimberlites
DS1991-0773
1991
Polozov, A.G.Ivanitskiy, V.P., Kharkiv, A.D., Matyash, I.V., Polozov, A.G.NMR spectra of magnetite from kimberlite and iron ore deposits of the Siberian Platform*(in Russian)Mineral. Zhurn., (Russian), Vol. 13, No. 2, April pp. 45-54RussiaUdachnaya pipe, Geochemistry
DS200712-0375
2007
Polozov, A.G.Gornova, M.A., Polozov, A.G., Ignatev, A.V., Velivetskaya, T.A.Peridotite nodules from the Udachnaya kimberlite pipe, nonmantle oxygen isotope ratios in garnets.Doklady Earth Sciences, Vol. 415, 5, pp. 777-781.RussiaDeposit - Udachnaya
DS201412-0316
2014
Polozov, A.G.Grishina, S.N., Polozov, A.G., Mazurov, M.P., Goryinov, S.V.Genesis of chloride-carbonate segregations of the Udachnaya-East pipe.Doklady Earth Sciences, Vol. 458, 1, pp. 1129-1131.Russia, YakutiaDeposit - Udachnaya-East
DS201609-1726
2016
Polozov, A.G.Kopylova, M.G., Gaudet, M., Kostrovitsky, S.I., Polozov, A.G., Yakovlev, D.A.Origin of salts and alkali carbonates in the Udachnaya East kimberlite: insights from petrography of kimberlite phases and their carbonate and evaporite xenoliths.Journal of Volcanology and Geothermal Research, in press available 19p.RussiaDeposit - Udachnaya East

Abstract: The Udachnaya East kimberlite is characterized by the presence of chlorides, sulfates and alkali carbonates. This highly atypical mineralogy underpinned a model for an anhydrous alkali-rich primary kimberlite melt, despite the absence of petrographic studies providing textural context to the exotic minerals. The present work documents the petrography of the Udachnaya East kimberlite in order to address this problem. The pipe comprises two varieties of Fort-a-la-Corne type pyroclastic kimberlite, olivine-rich and magmaclast-rich, and coherent kimberlite. These kimberlites entrain xenoliths of limestones, altered shales and siltstones, halite-dominated rocks, dolomites, and coarse calcite rocks. The distinct varieties of the Udachnaya East kimberlite carry different populations of crustal xenoliths, which partially control the mineralogy of the host kimberlite. In magmaclast-rich pyroclastic kimberlite, where halite is absent from the crustal xenoliths, it is not observed in the interclast matrix, or within the magmaclasts. Halite occurs in the interclast matrix of olivine-rich pyroclastic kimberlite, where halite xenoliths are common. Large, ~ 30 cm halite xenoliths are uniquely restricted to the coherent kimberlite and show a strong reaction with it. The halite xenoliths are sourced from depths of - 1500 to - 630 m, where carbonate beds host multiple karst cavities filled with halite and gypsum and occasional sedimentary evaporites. The style of secondary mineralization at Udachnaya depends on whether the kimberlite is coherent or pyroclastic. Shortite, pirssonite and other alkali carbonates replacing calcite and possibly serpentine are abundant only in porous pyroclastic kimberlites of both types and in their shale/siltstone xenoliths. The lower porosity of the coherent kimberlite prevented the interaction of kimberlite with Na brines. Serpentinization localized around halite xenoliths started at temperatures above 500 °C, as indicated by its association with high-temperature iowaite. The model of the “dry” Na and Cl-rich primary kimberlite melt is invalidated on the basis of 1) the restriction of exotic salt minerals to certain kimberlite types and xenoliths; and 2) the absence of halite-rich melt inclusions in olivine of coherent kimberlite.
DS1986-0777
1986
Poltaeatskii, V.G.Sozin, Yu.I., Nikitin, Yu.I., Poltaeatskii, V.G.Substructure and phase composition of natural diamonds containing lonsdaleite #2Sverkhtverd Material (Russian), No. 4, pp. 12-15RussiaDiamond, Morphology
DS1998-1024
1998
PoltaratskayaMitioukhine, S.I., Manakov, Poltaratskaya, RomanovNew dat a about the structure of the Earth's crust according to regional geophysical investigations.7th International Kimberlite Conference Abstract, pp. 606-8.Russia, YakutiaGeophysics - magnetotellurics, Geodynamics
DS1993-1251
1993
Poltaratskaya, O.L.Poltaratskaya, O.L.The prediction of the kimberlite fields according to deep geoelectrics -1.Diamonds of Yakutia, pp. 129-130.Russia, YakutiaGeophysics
DS1993-1252
1993
Poltaratskaya, O.L.Poltaratskaya, O.L.The prediction of the kimberlite fields on the base of deep geoelectricsPreprint handout at PDA Conference March 30, 1993, 2p.Russia, Siberia, Commonwealth of Independent States (CIS)Geophysics, Historical background
DS1993-1253
1993
Poltaratskaya, O.L.Poltaratskaya, O.L., Makhorin, A.M.The prediction of the kimberlite fields according to deep geoelectrics -1Diamonds of Yakutia, pp. 127-128.Russia, YakutiaGeophysics, Geoelectrics
DS1995-1509
1995
Poltoratskaya, O.L.Poltoratskaya, O.L.Lithosphere structure within the kimberlite fields of Yakutian diamondiferous Province: Magneto-telluric..Proceedings of the Sixth International Kimberlite Conference Almazy Rossii Sakha abstract, p. 19.Russia, YakutiaGeophysics -magnetics, Tellurics, Tectonics, structure
DS1986-0778
1986
Poltoratskii, V.G.Sozin, Yu.I., Nikitin, Yu.I., Poltoratskii, V.G.Substructure and phase composition of natural diamonds containing lonzdaleite #1Soviet Journal of Superhard. Mater, Vol. 8, No. 4, pp. 14-18RussiaNatural diamond
DS1987-0706
1987
Poltoratskiy, V.G.Sozin, Yu.I., Nikitin, Yu.I., Poltoratskiy, V.G.Natural mosaic diamond single crystals containing lonsdaleite.(Russian)Izmenie Svoistv. Mater. Pod. Deist. Vys. Davl. Kiev., (Russian), pp. 44-8. Khim. Zhur. abstract No. 4E293 1987RussiaBlank
DS201709-1962
2017
Polukeev, V.M.Borisova, A.Y., Zagrtdenov, N.R., Toplis, M.J., Bohrson, W.A., Nedelec, A., Safonov, O.G., Pokrovski, G.S., Ceileneer, G., Melnik, O.E., Bychkov, A.Y., Gurenko, A.A., Shscheka, S., Terehin, A., Polukeev, V.M., Varlamov, D.A., Gouy, S., De Parseval, P.Making Earth's continental crust from serpentinite and basalt. Goldschmidt Conference, abstract 1p.Mantleperidotites

Abstract: How the Earth's continental crust was formed in the Hadean eon is a subject of considerable debates [1-4]. For example, shallow hydrous peridotites [2,5], in particular the Hadean Earth's serpentinites [6], are potentially important ingredients in the creation of the continental ptoto-crust, but the mechanisms of this formation remain elusive. In this work, experiments to explore serpentinite-basalt interaction under conditions of the Hadean Earth were conducted. Kinetic runs lasting 0.5 to 48 hours at 0.2 to 1.0 GPa and 1250 to 1300°C reveal dehydration of serpentinite and release of a Si-Al-Na-K-rich aqueous fluid. For the first time, generation of heterogeneous hydrous silicic melts (56 to 67 wt% SiO2) in response to the fluid-assisted fertilisation and the subsequent partial melting of the dehydrated serpentinite has been discovered. The melts produced at 0.2 GPa have compositions similar to those of the bulk continental crust [2,3]. These new findings imply that the Earth's sialic proto-crust may be generated via fluid-assisted melting of serpentinized peridotite at shallow depths (=7 km) that do not require plate subduction during the Hadean eon. Shallow serpentinite dehydration and melting may be the principal physico-chemical processes affecting the earliest lithosphere. Making Earth's continental crust from serpentinite and basalt.
DS202004-0504
2020
Polushin, N.I.Chernykh, S.V., Chernykh, A.V., Tarelkin, S., Didenko, S. ,Kondakov, M.N., Shcherbachev, K.D., Trifonova, E.V., Drozdova, T.E., Troschiev, S.Y., Prikhodko, D.D., Glybin, Y.N., Chubenko, A.P., Britvich, G.I., Kiselev, D.A., Polushin, N.I., Rabinovich, O.IHPHT single crystal diamond type IIa characterization for particle detectors.Physicsa Status Solidi , doi:10.1002/pssa.201900888GlobalHPHT

Abstract: Various samples of multisectoral high-pressure high-temperature (HPHT) single-crystal diamond plate (IIa type) (4?×?4?×?0.53?mm) are tested for particle detection applications. The samples are investigated by X-ray diffractometry, photoluminescence spectroscopy, Raman spectroscopy, Fourier-transform infrared, and visible/ultraviolet (UV) absorption spectroscopy. High crystalline perfection and low impurity concentration (in the {100} growth sector) are observed. To investigate detector parameters, circular 1.0 and 1.5?mm diameter Pt Schottky barrier contacts are created on {111} and {100} growth sectors. On the backside, a Pt contact (3.5?×?3.5?mm) is produced. The {100} growth sector is proved to be a high-quality detector: the full width at half maximum energy resolution is 0.94% for the 5.489?MeV 226Ra a-line at an operational bias of +500?V. Therefore, it is concluded that the HPHT material {100} growth sector is used for radiation detector production, whose quality is not worse than the chemical vapor deposition method or specially selected natural diamond detectors.
DS1993-1616
1993
Polve, M.Trull, T., Nadeau, S., Pineau, F., Polve, M., Javoy, M.C-He systematics in hotspot xenoliths: implications for mantle carbon contents and carbon recycling.Earth and Planetary Science Letters, Vol. 118, No. 1-4, July, pp. 43-64.Mantle, Hawaii, Kerguelen Islands, IndiaXenoliths -Carbon and helium, Hotspots
DS2001-0003
2001
Polve, M.Abraham, A.C., Francis, D., Polve, M.Recent alkaline basalts as probes of the lithospheric mantle roots of the Northern Canadian Cordillera.Chemical Geology, Vol. 175, pp. 361-86.Yukon, British Columbia, CordilleraTectonics, Geochronology
DS201112-0223
2011
Polyak, V.Crow, R., Karlstrom, K., Asmerom, Y., Schmandt, B., Polyak, V., DuFrane, S.A.Shrinking of the Colorado Plateau via lithospheric mantle erosion: evidence from Nd and Sr isotopes and geochronology of Neogene basalts.Geology, Vol. 39, 1, pp. 27-30.United States, Colorado PlateauGeochronology
DS201201-0861
2011
PolyakaZaitsev, A.N., Chakmouradian, A.R., Sidra, O.I., Spratt, J., Williams, Stanley, Petrov, Britvin, PolyakaFlourine , yttrium and lanthaide rich cerianite (Ce) from carbonatitic rocks of the Kerimasi volcano and surrounding explosive craters Gregory Rift Tanzania.Mineralogical Magazine, Vol. 75, 6, pp. 2813-2822.Africa, TanzaniaCarbonatite
DS200512-1155
2004
PolyakovVrublevskii, V.V., Gertner, I.F., Polyakov, Izokh, Krupchatnikov, Travin, VoitenkoAr Ar isotopic age of lamproite dikes of the Chua Complex, Gornyi Altai.Doklady Earth Sciences, Vol. 399A, 9, Nov-Dec. pp. 1252-55.RussiaLamproite
DS1985-0328
1985
Polyakov, A.I.Kapustin, YE.L., Polyakov, A.I.Carbonatite Volcanoes of Eastern Africa and the Genesis of CarbonatitesIzves. Akad. Nauk, Sssr., No. 3, MARCH PP. 30-43.East AfricaBlank
DS1985-0329
1985
Polyakov, A.I.Kapustin, YU.L., Polyakov, A.I.Carbonatite Volcanoes of East Africa and the Genesis of Carbon- AtitesInternational Geology Review, Vol. 27, No. 4, pp. 434-448East Africa, Kenya, Uganda, TanzaniaCarbonatite
DS1989-1075
1989
Polyakov, A.I.Muravyeva, N.S., Polyakov, A.I., Kolesov, G.M., Shubina, N.A., SerinComposition of upper mantle and evidence of mantle metasomatism in the Baykal rift zoneGeochemistry International, Vol. 26, No. 9, pp. 24-38RussiaMantle -Lherzolites, Petrology
DS1992-1183
1992
Polyakov, A.N.Perchuk, L.L., Podladchikov, Y.Yu., Polyakov, A.N.Hydrodynamic modelling of some metamorphic processesJournal of Metamorphic Geology, Vol. 10, No. 3, May pp. 311-320GlobalMetamorphic processes, Modelling
DS1995-1510
1995
Polyakov, G.V.Polyakov, G.V., Trong Yem, N., et al.Geology and substance composition of the cocites of North VietnamProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 449-451.GlobalUltrapotassic, alkaline, Coesites
DS1996-0151
1996
Polyakov, G.V.Bognikov, V.I., Pavlov, A.L., Polyakov, G.V.The platinum group elements in the Atalyk ultrabasite basite intrusion, Gornyy AltayDoklady Academy of Sciences USSR, Vol. 336, pp. 92-97Russiaplatinum group elements (PGE), Layered intrusion, Deposit -Atalyk
DS1996-1128
1996
Polyakov, G.V.Polyakov, G.V., et al.Ultrapotassic basic rocks of Northern Vietnam -cocites in relation to The problem of lamproitic magmatismInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 390.GlobalLamproites, Coesites
DS200612-1496
2006
Polyakov, G.V.Vrublevskii, V.V., Voitenko, N.N., Romanov, A.P., Polyakov, G.V., Izokh, A.E., Gertner, I.F., Krupchatnikov, V.I.Magma sources of Triassic lamproites of Gornyi Altai and Taimyr: Sr and Nd isotope evidence for plume lithosphere interaction.Doklady Earth Sciences, Vol. 405A 9, pp. 1365-1367.RussiaLamproite
DS1993-0769
1993
Polyakov, I.V.Kalinkin, M.M., Arzamastsev, A.A., Polyakov, I.V.Kimberlites and related rocks of the Kola Peninsula.(Russian)Petrologiya, (Russian), Vol. 1, No. 2, April, pp. 205-214.RussiaKimberlites, Geochronology
DS1993-1254
1993
Polyakov, I.V.Polyakov, I.V., Kalinkin, M.M.Diamonds and associated minerals in kimberlites and loose sediments of Tersky shore (Kola Peninsula).(Russian)Proceedings of the Russian Mineralogical Society, (Russian), No. 1, pp. 96-101.Russia, Kola PeninsulaDiamonds, Geomorphology
DS201112-0811
2011
Polyakov, S.N.Polyakov, S.N., Denisov, V.N., Kuzmin, N.V., Kuznetsov, M.S., Martyushov, S.Yu., Nosukhin, Terentiev, BlankCharacterization of top quality type IIa synthetic diamonds for new x-ray optics.Diamond and Related Materials, Vol. 20, no. 5-6m pp. 726-728.TechnologyDiamond - synthesis applications
DS1996-1129
1996
Polyakov, V.B.Polyakov, V.B., Kharlashina, N.N.Direct calculation of B factors for graphite and diamond from measured specific heat capacities.Geochemistry International, Vol. 33, No. 8, pp. 16-30.GlobalGeothermometry, Petrology -Graphite and diamond
DS201212-0566
2012
Polyakov, V.B.Polyakov, V.B., Horita, J.Theoretical carbon isotope fractionation under deep earth conditions.Goldschmidt Conference 2012, abstract 1p.MantleCarbon
DS1987-0423
1987
Polyakov, V.P.Loladze, N.T., Polyakov, V.P., Fedorseev, D.F.Dependence of diamond formation on the crystallite size Of the starting carbonaceous material.(Russian)Kolloidn. Zh.(Russian), Vol. 49, No. 2, pp. 352-353GlobalCrystallography
DS1987-0424
1987
Polyakov, V.P.Loladze, N.T., Polyakov, V.P., Fedoseev, D.F.Dependence of the diamond formation process on the size of the crystallites of the starting carbonaceous material (technicalnote)Colloid. Journal, Vol. 9, No.2, Mar-Apr. pp. 307-308GlobalBlank
DS1991-1911
1991
Polyakov, V.P.Yelutin, A.V., Polyakov, V.P., Chernykh, R.O.Solubility of graphite and diamond in NIMN melt under the high pressure.(Russian)Doklady Academy of Sciences Nauk SSR, (Russian), Vol. 320, No. 4, pp. 864-867RussiaExperimental petrology, Graphite
DS200812-0909
2007
Polyakova, E.Polyakova, E., Journel, A.G.The Nu expression for probablistic dat a integration.Mathematical Geology, Vol. 39, pp. 715-733.TechnologyStatistical probability - not specific to diamonds
DS201112-0812
2011
Polyakova, E.A.Polyakova, E.A., Chakhmouradian, A.R., Siidra ,Britvin, Petrov, Spratt, Williams, Stanley, ZaitsevFluorine, yttrium and lanthanide rich cerianite from carbonatitic rocks of the Kerimasi volcano and surrounding explosion craters, Gregory Rift.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, TanzaniaCarbonatite
DS200512-0007
2004
PolyanichkoAgashev, A.M., Pokhilenko, N.P., Tolstov, A.V., Polyanichko, Malkovets, SobolevNew age dat a on kimberlites from the Yakutian Diamondiferous Province.Doklady Earth Sciences, Vol. 399, 8, pp.1142-1145.Russia, YakutiaGeochronology
DS201412-0877
2014
Polyanichko, V.V.Spetsius, Z.V., Polyanichko, V.V., Xarlamova, E.I.,Tarskix, O.V., Ivanov, A.S.Geology, petrography and mineralogy of the Zarya pipe kimberlites.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 160-177.RussiaDeposit - Zarya
DS201510-1807
2014
Polyanichko, V.V.Spetsius, Z.V., Polyanichko, V.V., Xarlamova, E.I., Tarskix, O.V., Ivanov, A.S.Geology, petrography and mineralogy of the Zarya pipe kimberlites.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 160-177.RussiaDeposit - Zarya
DS2000-0772
2000
Polyanov, Yu.N.Polyanov, Yu.N., Sokol, A.G., Khokhryakov et al.Diamond and graphite crystallization in COH fluid at Pt parameters of the natural diamond formation. #1Doklady Academy of Sciences, Vol. 375A, No. 9, pp. 1395-8.GlobalDiamond - morphology
DS1995-1567
1995
Polyanskii, O.P.Reverdatto, V.V., Sheplev, V.S., Polyanskii, O.P.Burial metamorphism and evolution of rift troughs: a model approachPetrology, (QE 420 P4), Vol. 3, No. 1, Jan-Feb. pp. 31-37RussiaTectonics, Rifting
DS201112-0278
2010
Polyansky, O.P.Dobretsov, N.L., Polyansky, O.P.On formation mechanisms of deep sedimentary basins: is there enough evidence for eclogitization?Russian Geology and Geophysics, Vol. 51, pp. 1314-1321.MantleGeodynamics, rifting
DS200812-0594
2008
Polyansky, V.G.Korobeyniko, S.N., Polyansky, V.G., Babichev, A.V., Reverdatto, V.V.Computer modeling of underthrusting and subduction under conditions of gabbro eclogite transition in the mantle.Doklady Earth Sciences, Vol. 421, 1, pp. 724-728.MantleSubduction
DS1983-0107
1983
Polykanov, Y.V.A.Argunov, K.P., Gafiyllina, D.S., Kirikitsa, S.I., Polykanov, Y.V.A.Trace Elements in Small Natural Diamonds.(russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 270, No. 3, pp. 693-695RussiaDiamond Morphology
DS1996-1582
1996
Polykovskiy, V.S.Yusupov, R.G., Polykovskiy, V.S., Mustafin, S.K.Native metals and nonmetals, carbides and silicides and the gas composition of their fluid inclusions...Doklady Academy of Sciences, Vol. 336, pp. 96-100.China, Tien ShanDiamond, Granulite ecologite
DS1989-0060
1989
Polzar, B.D.Bailey, R.C., Craven, J.A., Macnae, J.C., Polzar, B.D.Deep UTEM controlled source electromagnetic sounding across the Ivanhoe Lake cataclastic zoneGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A124. (abstract.)OntarioTectonics, Kapuskasing Zone
DS1989-0061
1989
Polzer, B.D.Bailey, R.C., Craven, J.A., Macnae, J.C., Polzer, B.D.Imaging of deep fluids in Archean crustNature, Vol. 340, No. 6229, July 13, pp. 136-8 Database #18038OntarioGeophysics, Midcontinent- Ivanhoe Lake
DS1994-1975
1994
Polzhaeva, L.Zaitsev, A., Polzhaeva, L.Dolomite calcite textures in carbonatites of the Kovdor ore deposit, KolaPeninsula: their genesis and application for calcite-dolomite geotherm.Contr. Mineralogy and Petrology, Vol. 116, No. 3, pp. 339-344.Russia, Kola PeninsulaCarbonatite, Deposit -Kovdor
DS1998-1178
1998
Pomares, J.S.Pomares, J.S.Assessment report on the drilling campaign over exploration permit 0001295Wemindji area, Quebec.Quebec Department of Mines, GM 56048, 43p.QuebecExploration - assessment, Monopros Limited
DS201112-0005
2011
PomazanskiAfanasev, V.P., Lobanov, S.S., Pokhilenko, N.P., Koptil, Mityukhin, Gerasimchuk, Pomazanski, GorevPolygenesis of diamonds in Siberian Platform. Five groups of diamonds have been distinquished.Russian Geology and Geophysics, Vol.l 52, pp. 259-274.Russia, SiberiaDiamond placers, alluvials
DS201112-1049
2011
Pomazanskii, B.S.Titkov, S.V., Ryabchikov, I.D., Pomazanskii, B.S., Magazina, L.O.Chloride Micro inclusions in diamonds of the Siberian Platform.Doklady Earth Sciences, Vol. 437, 2, pp. 503-506.Russia, SiberiaDiamond inclusions
DS201804-0740
2018
Pomazanskiy, B.S.Sonin, V.M., Zhimulev, E.I., Pomazanskiy, B.S., Zemnuhov, A.L., Chepurov, A.A., Afanasiev, V.P., Chepurov, A.I.Morphological features of diamond crystals dissolved in Fe0.7 S0.3 melt at 4GPa and 1400.Geology of Ore Deposits, Vol. 60, pp. 82-92.Technologydiamond morphology

Abstract: An experimental study of the dissolution of natural and synthetic diamonds in a sulfur-bearing iron melt (Fe0.7S0.3) with high P-T parameters (4 GPa, 1400°?) was performed. The results demonstrated that under these conditions, octahedral crystals with flat faces and rounded tetrahexahedral diamond crystals are transformed into rounded octahedroids, which have morphological characteristics similar to those of natural diamonds from kimberlite. It was suggested that, taking into account the complex history of individual natural diamond crystals, including the dissolution stages, sulfur-bearing metal melts up to sulfide melts were not only diamond-forming media during the early evolution of the Earth, but also natural solvents of diamond in the mantle environment before the formation of kimberlitic melts.
DS201412-0683
2014
Pomazansky, B.S.Petrovsky, V.A., Silaev, V.I., Sukharev, A.E., Vasilyev, E.A., Pomazansky, B.S., Zemnukhov, A.L.Yakutites: mineralogical geochemical properties and new version of the genesis. Part 1.Izvestiya VUZ'ov Geologia I Razvedka ** in Russia Courtesy of Felix, No. 3, pp. 24-33.Russia, YakutiaCarbonado, with lonsdaleite
DS201412-0825
2014
Pomazansky, B.S.Silaev, V.I., Petrovsky, V.A., Sukharev, A.E., Smoleva, I.V., Pomazansky, B.S., Zemnukhov, A.L.Yakutites: mineralogical geochemical properties and new version of the genesis. Part 2.Izvestiya VUZ'ov Geologia I Razvedka ** in Russia Courtesy of Felix, No. 4, pp. 12-22.TechnologyYakutites
DS201702-0235
2016
Pomazansky, B.S.Rakin, V.I., Kovalchuk, O.Y., Pomazansky, B.S.Dissymmetrization of artificial and natural diamonds,Doklady Earth Sciences, Vol. 471, 2, pp. 1303-1306.TechnologyDiamond crystallography

Abstract: The occurrence rates of combinatorial types of simple polyhedra {111} are analyzed for natural and artificial diamonds. The empirical occurrence rates of 14 possible polyhedra in an isotropic environment are obtained based on numeral simulation of growth forms of octahedral crystals by the Monte-Carlo method. The phenomenon of dissymmetrization by Curie’s principle related to the crystallization conditions is established for artificial and natural diamonds.
DS202012-2256
2020
Pomazansky, B.S.Zedgenizov, D.A., Skuzovatov, S.Y., Griffin, W.L., Pomazansky, B.S., Ragozin, A.:., Kalinina, V.V.Diamond forming HDFs tracking episodic mantle metasomatism beneath Nyurbinskaya kimberlite pipe (Siberian craton).Contributions to Mineralogy and Petrology, Vol. 175, 106, 21p. PdfRussiadeposit - Nyurbinskaya

Abstract: We present a new dataset on the composition of high-density fluids (HDFs) in cloudy (n?=?25), coated (n?=?10) and cuboid (n?=?10) diamonds from the Nyurbinskaya kimberlite pipe. These diamonds represent different populations each showing distinct growth histories. The cores of coated diamonds display multiple growth stages and contrasting sources of carbon. Fibrous coats and cuboid diamonds have similar carbon isotopes and nitrogen systematics, suggesting their formation in the last metasomatic events related to kimberlite magmatism, as is common for most such diamonds worldwide. The HDFs in most of these diamonds span a wide range from low-Mg carbonatitic to hydrous silicic compositions. The major- and trace-element variations suggest that the sources for such HDFs range in composition between the depleted mantle and more fertile mantle reservoirs. Hydrous-silicic HDFs could originate from a 13C-enriched source, which originates through subduction of crustal metasedimentary material. Percolation of such HDFs through carbonated eclogites and peridotites facilitates the formation of cuboid diamonds and fibrous coats in the mantle section beneath the corresponding area of the Siberian craton. Cloudy diamonds represent an apparently older population, reflecting continuous diamond formation predominantly from high-Mg carbonatitic HDFs that caused discrete episodes of diamond precipitation. Their high Mg# and enrichment in incompatible elements support a metasomatized peridotitic source for these HDFs.
DS1988-0403
1988
Pomchalov, A.V.Laptev, V.A., Pomchalov, A.V., Samoilovich, M.I.Diamond crystallization characteristics in a system consisting of a meta land difficulty graphitizable carbonaceous substances. (Russian)Sverkhtverd. Mater., (Russian), No. 4, pp. 13-17RussiaDiamond morphology
DS2001-0548
2001
Pomeroy, J.W.Jones, H.G., Pomeroy, J.W., Walker, D.A., Hoham, R.W.Snow ecology: an inter disciplinary examination of snow-covered ecosystems. BOOK REVIEW Cambridge Univ. Press, 378p. @ 80.00 USGeoscience Canada, Vol.29,2, June pp. 89-90.CanadaBook - review, Snow ecosystem
DS200612-1159
2006
Pomi, P.F.Richardson, S.H., Harris, J.W., Pomi, P.F.Antiquity of harzburgitic diamonds from the Venetia kimberlite, Limpopo Belt, Kaapvaal Craton.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 17. abstract only.Africa, South AfricaDeposit - Venetia,diamond genesis
DS200912-0626
2009
Pomi, P.F.Richardson, S.H., Pomi, P.F., Shirey, S.B., Harris, J.W.Age and origin of peridotite diamonds from Venetia, Limpopo belt, Kaapval- Zimbabwe Craton.Lithos, In press available, 35p.Africa, South AfricaDeposit - Venetia
DS201012-0592
2010
Pommier, A.Pommier, A., Gaillard, F., Pichavant, M.Time dependent changes of the electrical conductivity of basaltic melts with redox state.Geochimica et Cosmochimica Acta, Vol. 74, 5, pp. 1653-1671.MantleRedox
DS201412-0702
2014
Pommier, A.Pommier, A., Garnero, E.J.Petrology based modeling of mantle melt electrical conductvity and joint interpretation of electromagnetic and seismic results.Journal of Geophysical Research,, Vol. 119, 5, pp. 4001-4016.MantleGeophysics - EM, Seismics
DS201901-0056
2018
Pommier, A.Pommier, A., Roberts, J.Understanding electrical signals from below Earth's surface. SIGMELTS ( peridotite San Carlos)Geochimica et Cosmochimica Acta, Vol. 242, pp. 165-190.United States, Arizonaperidotite

Abstract: Scientists have known for a long time that various types of rock conduct current differently and that these differences are even more pronounced as the temperatures and pressures increase farther beneath Earth’s surface. They also know that unusual changes in electrical conductivity can signal activity down below, like migrating magma or a release of trapped fluids. Thus, electrical measurements can uncover clues about the events that trigger earthquakes and volcanic eruptions here on the surface. They can also give clues to the mantle’s structure and dynamics. However, interpreting these signals is far from straightforward. Earth scientists increasingly use electrical observations made in the field to image Earth’s crust and mantle, in particular, at subduction zones and mid-ocean ridges. An effective means of interpreting these electrical images and placing them into context with other geological observations is key to translating raw data into usable knowledge. Such knowledge includes assessing potential hazards by investigating, for example, links between fluid release and earthquake generation or the production and transport of magmatic melt from its source region to an eventual eruption. SIGMELTS is a freely available app that helps to characterize electrically conductive or resistive features detected at depth using electromagnetic observations. The objective of this Web application is to facilitate the elaboration of models of the electrical properties of crust and mantle materials, which, in turn, is used to improve the interpretation of field electromagnetic observations. A new version of SIGMELTS is now available.
DS201907-1589
2019
Pommier, A.Zhang, Z., Qin, T., Pommier, A., Hirschmann, M.M.Carbon storage in Fe-Ni-S liquids in the deep upper mantle and its relation to diamond and Fe-Ni alloy precipitation.Earth and Planetary Science Letters, Vol. 520, pp. 164-174.Mantlediamond genesis

Abstract: To better understand the role of sulfide in C storage in the upper mantle, we construct a thermodynamic model for Fe-Ni-S-C sulfide melts and consider equilibrium between sulfide melts, mantle silicates, Fe-Ni alloy, and diamond. The sulfide melt model is based upon previous parameterization of Fe-Ni-S melts calibrated at 100 kPa, which we have extended to high pressure based on volumetric properties of end-member components. We calculate the behavior of C in the sulfide melt from empirical parameterization of experimental C solubility data. We calculate the continuous compositional evolution of Fe-Ni sulfide liquid and associated effects on carbon storage at pressure and redox conditions corresponding to mantle depths of 60 to 410 km. Equilibrium and mass balance conditions were solved for coexisting Fe-Ni-S melt and silicate minerals (olivine [(Mg,Fe,Ni)2SiO4], pyroxene [(Mg,Fe)SiO3]) in a mantle with 200 ppmw S. With increasing depth and decreasing oxygen fugacity (fO2), the calculated melt (Fe+Ni)/S atomic ratio increases from 0.8-1.5 in the shallow oxidized mantle to 2.0-10.5 in the reduced deep upper mantle (>8 GPa), with Fe-Ni alloy saturation occurring at >10 GPa. Compared to previous calculations for the reduced deep upper mantle, alloy saturation occurs at greater depth owing to the capacity of sulfide melt to dissolve metal species, thereby attenuating the rise of Fe and Ni metal activities. The corresponding carbon storage capacity in the metal-rich sulfide liquid rises from negligible below 6 GPa to 8-20 ppmw at 9 GPa, and thence increases sharply to 90-110 ppmw at the point of alloy saturation at 10-12 GPa. The combined C storage capacity of liquid and solid alloy reaches 110-170 ppmw at 14 GPa. Thus, in the deep upper mantle, all carbon in depleted sources (10-30 ppmw C) can be stored in the sulfide liquid, and alloy and sulfide liquids host a significant fraction of the C in enriched sources (30-500 ppmw C). Application of these results to the occurrences of inferred metal-rich sulfide melts in the Fe-Ni-S-C system and inclusions in diamonds from the mantle transition zone suggests that oxidization of a reduced metal-rich sulfide melt is an efficient mechanism for deep-mantle diamond precipitation, owing to the strong effect of (Fe+Ni)/S ratio on carbon solubility in Fe-Ni-S melts. This redox reaction likely occurs near the boundary between oxidized subducted slabs and the reduced ambient peridotitic mantle.
DS200812-0105
2008
Pomorski, M.Berderman, E., Caragheorgheopol, A., Clobanu, M., Pomorski, M., Pullia, A., Riboldi, S.,Traeger, M., Weick, H.Ion spectroscopy - a diamond characterization tool.Diamond and Related Materials, Vol. 17, 7-10, pp. 1159-1163.TechnologySpectroscopy
DS1994-1395
1994
Pomposiello, M.C.Pomposiello, M.C., et al.MT studies in the southeast region of Tucuman Plain, ArgentinaJournal of South American Earth Sciences, Vol. 7, No. 3, April pp. 101-108ArgentinaStructure
DS1997-0993
1997
Pomposiello, M.C.Sainato, C.M., Pomposiello, M.C.Two dimensional magnetotelluric and gravity models of the Tuzgle Volcano Zone Jujuy ProvinceJournal of South American Earth Sciences, Vol. 10, No. 3-4, pp. 247-262ArgentinaGeophysics - magnetics, gravity
DS1992-1217
1992
Ponahlo, J.Ponahlo, J.Cathodluminescence (CL) and CL spectra of de Beers' experimental syntheticdiamondsJournal of Gemology, Vol. 23, No. 1, January pp. 3-18GlobalSynthetic diamonds, Chlorine, Cathodluminescence
DS1993-0116
1993
Ponahlo, J.Bezborodov, S.M., Garanin, V.K., Kudryavtseva, G.P., Ponahlo, J.Find of eclogite with two diamond generations in the Udachnaya kimberlitepipeDoklady Academy of Sciences USSR, Earth Science Section, Vol. 317 A February Publishing date pp. 190-194Russia, YakutiaDiamond morphology, Deposit -Udachnaya
DS1991-0116
1991
Ponailo, I.Bezborodov, S.M., Garanin, V.K., Kudryavtseva, G.P., Ponailo, I.Discovery of eclogite with generations of diamond in the Udachnaya kimberlite pipe. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 317, No. 3, pp. 714-717RussiaDiamond genesis, Eclogite
DS1970-0176
1970
Ponamarenko, A.I.Ponamarenko, A.I., Pankratov, A.A., Poberezhskiy, V.A.Occurrence of Kimberlite Magmatism on the Southern Slope Of the Anabar Anticlise (uplift).In: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 33-47.RussiaBlank
DS1970-0384
1971
Ponamarenko, A.I.Ponamarenko, A.I.A Deep Seated Inclusion of Phlogopite-olivine-picroilmenite rock in the Yakutian Kimberlite and its Relation to Pyrope Or Peridotite.Doklady Academy of Sciences Nauk SSSR., Vol. 200, No. 6, PP. 1429-1432.RussiaBlank
DS1970-0385
1971
Ponamarenko, A.I.Ponamarenko, A.I., Kharkiv, A.D.Xenoliths of Rocks of the Trap Formation in Kimberlite Pipes of the Malo-botuobia Diamondiferous Region. In: Trappy Sibirskoy Platformy.....Unknown, PP. 43-44.RussiaBlank
DS1992-1743
1992
Ponamarenko, A.I.Zhuravlev, A.Z., Lazko, E.E., Ponamarenko, A.I.Ancient depleted subcontinental lithosphere under Siberian platform:Proceedings of the 29th International Geological Congress. Held Japan, Vol. 1, abstract p. 179Russia, YakutiaGeochronology, Mir pipe
DS2002-0581
2002
Ponce, D.A.Glen, J.M.G., Ponce, D.A.Large scale fractures related to inception of the Yellowstone hotspotGeology, Vol. 30, No. 7, July pp. 647-50.Idaho, Oregon, NevadaPaleomagnetics
DS201610-1895
2016
Ponce, D.A.Peacock, J.R., Denton, K.M., Ponce, D.A.Magnetotelluric imaging of a carbonatite terrane in the southeast Mojave desert, California and Nevada.ASEG-PESA-AIG 2016 25th Geophysical Conference, abstract 5p.United States, California, NevadaCarbonatite

Abstract: The southeast Mojave Desert hosts one of the world’s largest rare earth element (REE) deposits at Mountain Pass, California. Although surface geology has been studied, a full understanding of the carbonatite and associated intrusive suite complex requires subsurface geophysical characterization. In this study, a combination of geophysical methods, including magnetotelluric (MT), magnetics, and gravity are used to create a two-dimensional (2D) geophysical model to a depth of about 10 km. An electrically conductive body is found 2-3 km below and west of the deposit that is associated with a magnetic high that could be connected to a deeper (10 km) conductive body related to possible intrusions or hydrothermal systems. The carbonatite body coincides with a steep magnetic gradient and a bench or terrace in the gravity data that may reflect relative lower-density intrusive rocks. Although carbonatite rocks are typically magnetic, the carbonatite rocks, associated intrusive suite, and host rocks in this area are essentially non-magnetic. Combined geophysical data indicate that the enriched REE deposit may be related to a regional extensive hydrothermal alteration event.
DS201904-0757
2019
Poncet, F.Malavergegne, V., Bureau, H., Raepsaet, C., Gaillard, C., Poncet, F., Surble, M., Sifre, S., Shcheka, D., Fourdrin, S., Deldicque, C., Khodja, D., HichamExperimental constraints on the fate of H and C during planetary core-mantle differentiation. Implications for the Earth.Icarus - New York, Vol. 321, 1, pp. 473-485.Mantlecarbon

Abstract: Hydrogen (H) and carbon (C) have probably been delivered to the Earth mainly during accretion processes at High Temperature (HT) and High Pressure (HP) and at variable redox conditions. We performed HP (1-15?GPa) and HT (1600-2300°C) experiments, combined with state-of-the-art analytical techniques to better understand the behavior of H and C during planetary differentiation processes. We show that increasing pressure makes H slightly siderophile and slightly decreases the highly siderophile nature of C. This implies that the capacity of a growing core to retain significant amounts of H or C is mainly controlled by the size of the planet: small planetary bodies may retain C in their cores while H may have rather been lost in space; larger bodies may store both H and C in their cores. During the Earth's differentiation, both C and H might be sequestrated in the core. However, the H content of the core would remain one or two orders of magnitude lower than that of C since the (H/C)core ratio might range between 0.04 and 0.27.
DS200512-0866
2005
Pond, M.Pond, M.What is the Ontario mining act?Canadian Diamonds, Summer, p.16, 18.Canada, OntarioNews item - legal
DS1985-0426
1985
Pondaga, M.H.Mauritsch, H.J., Pondaga, M.H.Paleomagnetic Investigations on the East African Rift in Northern Tanzania.Journal of GEODYNAMICS, Vol. 2, No. 2-3. JUNE PP. 265-274.Central Africa, TanzaniaPaleomagnetics, Tectonics
DS1987-0382
1987
Pondaga, M.M.Krs, M., Pondaga, M.M., Savary, B.P.Geophysical investigation of the ring structure at Zanzui, NorthernTanzaniaPhysics of the Earth and Planetary Interiors, Vol.45, pp. 294-303TanzaniaGeophysics, Structure
DS2003-1164
2003
Poniatowski, B.T.Rikhotso, C.T., Poniatowski, B.T., Hetman, C.M.Overview of the exploration, evaluation and geology of the Gahcho Kue kimberlites8th. International Kimberlite Conference Large Core Exhibit volume, 8p.Northwest TerritoriesGeology - description, Deposit - Gahcho Kue, 5034, Hearne, Tuzo, Tesla
DS200412-1668
2003
Poniatowski, B.T.Rikhotso, C.T., Poniatowski, B.T., Hetman, C.M.Overview of the exploration, evaluation and geology of the Gahcho Kue kimberlites, Northwest Territories.8th. International Kimberlite Conference Large Core Exhibit volume, 8p.Canada, Northwest TerritoriesGeology - description Deposit - Gahcho Kue, 5034, Hearne, Tuzo, Tesla
DS1970-0247
1971
PonikarBorodin, L.S., Gopal, V., Moralev, V.M., Suramanian, V., PonikarPrecambrian Carbonatites of Tamil Nadu, South IndiaGeological Society INDIA Journal, Vol. 12, No. 2, PP. 101-112.India, Tamil NaduPetrography, Analyses
DS201705-0884
2017
Ponkratov, K.Ugapeva, S., Goryainov, S., Afanasiev, V., Ponkratov, K.Raman mapping of mechanical stress field in diamond around a chromite inclusion.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 11676 AbstractTechnologyDiamond inclusions
DS200812-0728
2008
PonkratzMcCammon, C., Kantor, I., Narygina, O., Roquette, J., Ponkratz, Sergieev, Mezouar, Prakapenka, DubrovinskyStable intermediate spin ferrous iron in lower mantle perovskite.Nature Geoscience, Vol. 1, 10, pp. 684-687.MantlePerovskite
DS200612-0468
2006
PonomarchukGladkochub, D.P., Wingate, M.T.D., Pisarevsky, S.A., Donskaya, T.V., Mazukababzov, Ponomarchuk, StanevichMafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia.Precambrian Research, Vol. 147, 3-4, July 5, pp. 260-278.Russia, CanadaMagmatism
DS200612-0469
2006
PonomarchukGladkochub, D.P., Wingate, M.T.D., Pisarevsky, S.A., Donskaya, T.V., Mazukabzov, Ponomarchuk, StanevichMafic intrusions in southwestern Siberia and implications for a Neoproterozoic connection with Laurentia.Precambrian Research, In press, availableRussia, SiberiaGeochronology, Biryusa, magmatism
DS201712-2678
2017
Ponomarchuk, A.V.Chebotarev, D.A., Doroshkevich, A.G., Sharygin, V.V., Yudin, D.S., Ponomarchuk, A.V., Sergeev, S.A.Geochronology of the Chuktukon carbonatite massif, Chadobets uplift ( Krasnoyarsk Territory).Russian Geology and Geophysics, Vol. 58, pp. 1222-1231.Russiacarbonatite

Abstract: We present results of U-Pb (SHRIMP II) and Ar-Ar geochronological study of the rocks of the Chuktukon massif, which is part of the Chadobets alkaline-carbonatite complex, and of the weathering crust developed after them. Perovskite from picrites and monazite from the weathering crust were dated by the U-Pb (SHRIMP II) method, and rippite from carbonatites, by the Ar-Ar method. Rippite has first been used as a geochronometer. The estimated ages (252 ± 12 and 231 ± 2.7 Ma) testify to two magmatism pulses close in time (within the estimation error) to the stages of alkaline magmatism in the Siberian Platform (250-245 and 238-234 Ma). These pulses characterize, most likely, the processes accompanying and completing the activity of the mantle superplume that formed the Siberian Igneous Province at 250-248 Ma. The monazite-estimated age (102.6 ± 2.9 Ma) reflects the time of formation of the ore-bearing weathering crust on the massif rocks.
DS201803-0443
2018
Ponomarchuk, A.V.Doroshkevich< A.G., Prokopyev, I.R., Izokh, A.E., Klemd, R., Ponomarchuk, A.V., Nikolaeva, I.V., Vladykin, N.V.Isotopic and trace element geochemistry of the Seligdar magnesiocarbonatites ( South Yakutia, Russia): insights regarding the mantle evolution beneath the Aldan Stanovoy shield.Journal of Asian Earth Sciences, Vol. 154, pp. 354-368.Russia, Yakutiacarbonatite -Seligdar

Abstract: The Paleoproterozoic Seligdar magnesiocarbonatite intrusion of the Aldan-Stanovoy shield in Russia underwent extensive postmagmatic hydrothermal alteration and metamorphic events. This study comprises new isotopic (Sr, Nd, C and O) data, whole-rock major and trace element compositions and trace element characteristics of the major minerals to gain a better understanding of the source and the formation process of the carbonatites. The Seligdar carbonatites have high concentrations of P2O5 (up to 18?wt%) and low concentrations of Na, K, Sr and Ba. The chondrite-normalized REE patterns of these carbonatites display significant enrichments of LREE relative to HREE with an average La/Ybcn ratio of 95. Hydrothermal and metamorphic overprints changed the trace element characteristics of the carbonatites and their minerals. These alteration processes were responsible for Sr loss and the shifting of the Sr isotopic compositions towards more radiogenic values. The altered carbonatites are further characterized by distinct 18O- and 13C-enrichments compared to the primary igneous carbonatites. The alteration most likely resulted from both the percolation of crustal-derived hydrothermal fluids and subsequent metamorphic processes accompanied by interaction with limestone-derived CO2. The narrow range of negative eNd(T) values indicates that the Seligdar carbonatites are dominated by a homogenous enriched mantle source component that was separated from the depleted mantle during the Archean.
DS202008-1426
2020
Ponomarchuk, A.V.Nikolenko, A.M., Doroshkevich, A.G., Ponomarchuk, A.V., Redina, A.A., Prokopyev, I.R., Vladykin, N.V., Nikolaeva, I.V.Ar-Ar geochronology and petrogenesis of the Mushgai-Khudag alkaline-carbonatite complex 9 southern Mongolia).Lithos, Vol. 372-372, 105675 15p. PdfAsia, Mongoliacarbonatite

Abstract: The Mushgai-Khudag alkaline-carbonatite complex, located in southern Mongolia within the Central Asian Orogenic Belt (CAOB), comprises a broad range of volcanic and subvolcanic alkaline silicate rocks (melanephelinite-trachyte and shonkinite-alkaline syenite, respectively). Magnetite-apatite rocks, carbonatites, and fluorite mineralization are also manifested in this area. The complex formed between 145 and 133 Ma and is contemporaneous with late Mesozoic alkaline-carbonatite magmatism within the CAOB. Major and trace element characteristics of silicate rocks in the Mushgai-Khudag complex imply that these rocks were formed by the fractional crystallization of alkaline ultramafic parental magma. Magnetite-apatite rocks may be a product of silicate-Ca-Fe-P liquid immiscibility that took place during the alkaline syenite crystallization stage. The Mushgai-Khudag rocks have variable and moderately radiogenic Sr (87Sr/86Sr(i) = 0.70532-0.70614), ?Nd(t) = -1.23 to 1.25) isotopic compositions. LILE/HFSE values and SrNd isotope compositions indicate that the parental melts of Mushgai-Khudag were derived from a lithospheric mantle source that was affected by a metasomatic agent in the form a mixture of subducted oceanic crust and its sedimentary components. The d18OSMOW and d18CPDB values for calcites in carbonatites range from 16.8‰ to 19.2‰ and from -3.9‰ to 2.0‰, respectively. CO covariations in calcites of the Mushgai-Khudag carbonatites can be explained by the slight host limestone assimilation.
DS1991-1737
1991
Ponomarchuk, V.A.Tolstykh, N.D., Krivenko, A.P., Elisafenko, V.N., Ponomarchuk, V.A.Mineralogy of apatite-bearing carbonatites from Kuznetsk AlatauSoviet Geology and Geophysics, Vol. 32, No. 11, pp. 41-48RussiaCarbonatite, Mineralogy
DS2002-0837
2002
Ponomarchuk, V.A.Khabarov, E.M., Ponomarchuk, V.A., Morozova, J.P.Strontium isotopic evidence for supercontinental breakup and formation in the Riphean Western Margin of the Siberian Craton.Russian Journal of Earth Science, Vol. 4, 4, AugustRussia, SiberiaGeochronology
DS200612-0740
2006
Ponomarchuk, V.A.Kovalenko, V.I., Yarmolyuk, Salnikova, Kozlovski, Kotov, Kovach, Vladykin, Savatenkov, V.M., Ponomarchuk, V.A.Geology and age of Khan-Bogdinsky massif of alkaline granitoids in southern Mongolia.Vladykin: VI International Workshop, held Mirny, Deep seated magmatism, its sources and plumes, pp. 17-45.Asia, MongoliaAlkaline rocks, granites
DS200712-0363
2007
Ponomarchuk, V.A.Gladkochub, D.P., Donskaya, T.V., Mazukabzov, A.M., Stanevich, A.M., Sklyarov, E.V., Ponomarchuk, V.A.Signature of Precambrian extension events in the southern Siberian Craton.Russian Geology and Geophysics, Vol. 48, pp. 17-31.RussiaDike swarm, rifting, Rodinia
DS200712-1064
2007
Ponomarchuk, V.A.Talibova,A.G., Ponomarchuk, V.A., Semenova, D.V.EA-IRMS: analysis of graphite and diamond.Plates, Plumes, and Paradigms, 1p. abstract p. A997.TechnologyDiamond
DS200912-0686
2009
Ponomarchuk, V.A.Semenova, D.V., Ponomarchuk, V.A.Carbon isotopic composition in diamonds and crystalline graphite - continuous flow GB-IRMS method.Goldschmidt Conference 2009, p. A1193 Abstract.TechnologyChemistry
DS202006-0946
2020
Ponomarchuk, V.A.Ponomarchuk, V.A., Dobretsov, N.L. , Lazareva, E.V., Zhmodik, S.M., Karmanov, N.S., Tolstov, A,V., Pyryaev, A.N.Evidence of microbial-induced mineralization in rocks of the Tomtor carbonatite complex ( Arctic Siberia).Doklady Earth Science, Vol. 490, 2, pp. 76-80.Russia, Siberiacarbonatite

Abstract: Carbonates of the Tomtor complex of ultramafic alkaline rocks and carbonatites (the northern part of the Republic of Sakha Yakutia) are distinguished by a wide range of carbon isotopic composition d13C from +2 to -59.9‰. The geological position, localization patterns, mineral and chemical compositions and the relationship with REE mineralization of samples with values of d13C carbonates from -25 to -59‰ are characterized. The formation of abnormally low d13C in carbonates is determined by the biogenic oxidation of methane from d13Cmet to -70‰.
DS1970-0386
1971
Ponomarenko, A.I.Ponomarenko, A.I., Ponomarenko, G.A., Kharkiv, A.D., et al.Inclusions of Ilmenite-bearing Ultrabasic Rocks in the Kimberlites of Yakutia.Sovetsk. Geol., No. 10, PP. 102-111.RussiaBlank
DS1975-0383
1976
Ponomarenko, A.I.Ponomarenko, A.I., et al.Diamond bearing grospidite and diamond bearing kyanite eclogite from Udachnaya kimberlite pipe, Yakutia.Doklady Academy of Sciences, Vol. 226, pp. 158-61.Russia, YakutiaMineralogy, Deposit - Udachnaya
DS1975-0384
1976
Ponomarenko, A.I.Ponomarenko, A.I., et al.Rock Forming Minerals of Diamond Bearing Eclogite from Richpipes Yakutia.Vyssh. Uchebn. Zaved. Izv. Geol. Razed., 1976, No. 7, PP. 47-50.RussiaBlank
DS1975-1184
1979
Ponomarenko, A.I.Ponomarenko, A.I.First find of diamond bearing garnet ilmenite peridotite in the Mirkimberlite pipe.Doklady Academy of Sciences, Vol. 235, pp. 153-6.Russia, YakutiaMineralogy, Deposit - Mir
DS1981-0392
1981
Ponomarenko, A.I.Spetsius, Z.V., Ponomarenko, A.I.Vitrified Eclogite, Representative of the Earth's Asthenosphere.Doklady Academy of Science USSR, Earth Science Section., Vol. 248, No. 1-6, PP. 115-118.RussiaBlank
DS1982-0411
1982
Ponomarenko, A.I.Matsyuk, S.S., Platonov, A.N., Ponomarenko, A.I., Kharkiv, A.D.Color of Garnet As Criterion of Presence of Diamond in Eclogitic Paragenesis of Kimberlite Pipes.Zap. Vses. Mineral. Obshch., Vol. 111, No. 2, PP. 159-166.RussiaBlank
DS1982-0501
1982
Ponomarenko, A.I.Ponomarenko, A.I., Spetsius, Z.V.Mineral Rims on Diamonds from KimberlitesInternational Geology Review, Vol. 24, No. 7, PP. 829-834.RussiaEvaluation, Carbonate, Genesis, Analyses, Microprobe, Crystallography
DS1982-0502
1982
Ponomarenko, A.I.Ponomarenko, A.I., Spetsius, Z.V., Sobolev, N.V.New Type of Diamond Bearing Rock- Garnet PyroxeniteDoklady Academy of Science USSR, Earth Science Section., Vol. 251, No. 2, PP. 89-91.RussiaPetrography
DS1987-0592
1987
Ponomarenko, A.I.Ponomarenko, A.I., Tsepin, A.I.First diamond bearing phlogopite pyroxenite find.Axenolith from the Mir kimberlite pipe, YakutiaDoklady Academy of Science USSR, Earth Science Section, Vol. 297, No. 6, Nov-Dec pp. 155-159RussiaXenolith, Phlogopite pyroxenite
DS1987-0593
1987
Ponomarenko, A.I.Ponomarenko, A.I., Tsepin, A.I.1st occurrence of diamond bearing phlogopite xenolith from the pipe Yakutia.(Russian)Dokl. Akad. Sci. SSSR, (Russian), Vol. 297, No. 5, pp. 1210-1213RussiaBlank
DS1988-0548
1988
Ponomarenko, A.I.Ponomarenko, A.I.Conversion of kyanite (Al/2SIO/5) to corundum (Al/2O/3) and SiO/2Dokl. Acad. Sciences USSR Earth Science Section, Vol. 303, No. 6, pp. 103-106GlobalExperimental petrology, aluminum, Eclogite
DS1989-1231
1989
Ponomarenko, A.I.Ponomarenko, A.I., Tsepin, A.I.First diamond bearing phlogopite pyroxenite find ( axenolith from the Mirkimberlite pipe (Yakutia)Doklady Academy of Science USSR, Earth Science Section, Vol. 297, No. 1-6, pp. 153-159RussiaDiamond morphology, Diamond inclusions
DS1991-1627
1991
Ponomarenko, A.I.Sobolev, N.V., Zuev, V.M., Bezborodov, S.M., Ponomarenko, A.I.Eclogite paragenesis of diamonds from Udachnaya and Mir pipes, YakutiaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, p. 391RussiaXenoliths, Omphacites
DS1991-1935
1991
Ponomarenko, A.I.Zhuravlev, A.Z., Lazko, E.E., Ponomarenko, A.I.Ancient depleted subcontinental lithosphere under Siberian platform: neodymium-SrProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 581-583RussiaXenoliths, Petrology, geochemistry
DS1992-1744
1992
Ponomarenko, A.I.Zhuravlev, A.Z., Lazko, Ye.Ye., Ponomarenko, A.I.Radiogenic isotopes and rare earth elements (REE) in garnet peridotite xenoliths from the Mirkimberlite pipe, YakutiaGeochemistry International, Vol. 29, No. 2, pp. 45-55RussiaGeochemistry, Deposit -Mir pipe
DS1995-1584
1995
Ponomarenko, A.I.Roden, M.F., Lazko, E.E., Ponomarenko, A.I., Serenko, V.P.Mineralogy of peridotite xenoliths from the Mir kimberlite Yakutia, Russia.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 462-464.Russia, YakutiaXenoliths, Deposit -Mir
DS1970-0386
1971
Ponomarenko, G.A.Ponomarenko, A.I., Ponomarenko, G.A., Kharkiv, A.D., et al.Inclusions of Ilmenite-bearing Ultrabasic Rocks in the Kimberlites of Yakutia.Sovetsk. Geol., No. 10, PP. 102-111.RussiaBlank
DS200712-0857
2007
Ponomarenko, V.A.Pribavkin, S.V., Ronkiv, Yu.L., Travin, A.V., Ponomarenko, V.A.New dat a on the age of lamproite-lamprophyre magmatism in the Urals.Doklady Earth Sciences, Vol. 413, 2, pp. 213-215..Russia, UralsLamproite
DS201905-1068
2019
Ponomarev, J.D.Prokopyev, I.R., Doroshkevich, A.G., Sergeev, S.A., Ernst, R.E., Ponomarev, J.D., Redina, A.A., Chebotarev, D.A., Nikolenko, A.M., Dultsev, V.F., Moroz, T.N., Minakov, A.V.Petrography, mineralogy and SIMS U-Pb geochronology of 1.0 - 1.8 Ga carbonatites and associated alkaline rocks of the Central Aldan magnesiocarbonatite province ( South Yakutia, Russia).Mineralogy and Petrology, Doi.org/a0.1007/ s00710-019-00661-3 24p.Russiacarbonatites
DS201906-1339
2019
Ponomarev, J.D.Prokopyev, I.R., Doroshkevich, A.G., Sergeev, S.A., Ernst, R.E., Ponomarev, J.D., Redina, A.A., Chebotarev, D.A., Nikolenko, A.M., Dultsev, V.F., Moroz, T.N., Minakov, A.V.Petrography, mineralogy and SIMS U-Pb geochronology of 1.9-1.8 Ha carbonatites and associated alkaline rocks of the Central-Aldan magnesiocarbonatite province ( South Yakutia, Russia).Mineralogy and Petrology, Vol. 113, pp. 329-352.Russia, Yakutiacarbonatites
DS200512-0405
2005
Ponomarev, P.Harris, J.R., Ponomarev, P., Shang, J.A comparison of methods for extracting end members from airborne hyper spectral data: application to geologic mapping in Canada's Arctic.GAC Annual Meeting Halifax May 15-19, Abstract 1p.Canada, Nunavut, Northwest TerritoriesRemote sensing
DS200612-0536
2006
Ponomarev, P.Harris, J.R., Ponomarev, P., Shang, S., Budkewitsch, P., Rogge, D.A comparison of automatic and supervised methods for extracting lithological end members from hyper spectral data: application to southern Baffin Island, Nunavut.Geological Survey of Canada Current Research, 2006-C4 19p.Canada, NunavutHyperspectral - technology
DS201809-2070
2018
Pons, M-L.McCoy-West, A.J., Fitton, J.G., Pons, M-L., Inglis, E.C., Williams, H.M.The Fe and Zn isotope composition of deep mantle source regions: insight from Baffin Island picrites.Geochimica et Cosmochimica Acta, Vol. 238, pp. 542-562.Canada, Nunavut, Baffin Islandpicrites

Abstract: Young (61?Ma) unaltered picrites from Baffin Island, northeast Canada, possess some of the highest 3He/4He (up to 50?Ra) seen on Earth, and provide a unique opportunity to study primordial mantle that has escaped subsequent chemical modification. These high-degree partial melts also record anomalously high 182W/184W ratios, but their Sr-Nd-Hf-Pb isotopic compositions (including 142Nd) are indistinguishable from those of North Atlantic mid-ocean ridge basalts. New high precision Fe and Zn stable isotope analyses of Baffin Island picrites show limited variability with d56Fe ranging from -0.03‰ to 0.13‰ and d66Zn varying from 0.18‰ to 0.28‰. However, a clear inflection is seen in both sets of isotope data around the composition of the parental melt (MgO?=?21?wt%; d56Fe?=?0.08?±?0.04‰; and d66Zn?=?0.24?±?0.03‰), with two diverging trends interpreted to reflect the crystallisation of olivine and spinel in low-MgO samples and the accumulation of olivine at higher MgO. Olivine mineral separates are significantly isotopically lighter than their corresponding whole rocks (d56Fe?=?-0.62‰ and d66Zn?=?-0.22‰), with analyses of individual olivine phenocrysts having extremely variable Fe isotope compositions (d56Fe?=?-0.01‰ to -0.80‰). By carrying out modelling in three-isotope space, we show that the very negative Fe isotope compositions of olivine phenocryst are the result of kinetic isotope fractionation from disequilibrium diffusional processes. An excellent correlation is observed between d56Fe and d66Zn, demonstrating that Zn isotopes are fractionated by the same processes as Fe in simple systems dominated by magmatic olivine. The incompatible behaviour of Cu during magmatic evolution is consistent with the sulfide-undersaturated nature of these melts. Consequently Zn behaves as a purely lithophile element, and estimates of the bulk Earth Zn isotope composition based on Baffin Island should therefore be robust. The ancient undegassed lower mantle sampled at Baffin Island possesses a d56Fe value that is within error of previous estimates of bulk mantle d56Fe, however, our estimate of the Baffin mantle d66Zn (0.20?±?0.03‰) is significantly lower than some previous estimates. Comparison of our new data with those for Archean and Proterozoic komatiites is consistent with the Fe and Zn isotope composition of the mantle remaining constant from at least 3?Ga to the present day. By focusing on large-degree partial melts (e.g. komatiites and picrites) we are potenitally biasing our record to samples that will inevitably have interacted with, entrained and melted the ambient shallow mantle during ascent. For a major element such as Fe, that will continuosly participate in melting as it rises through the mantle, the final isotopic compositon of the magama will be a weighted average of the complete melting column. Thus it is unsuprising that minimal Fe isotope variations are seen between localities. In contrast, the unique geochemical signatures (e.g. He and W) displayed by the Baffin Island picrites are inferred to solely originate from the lowermost mantle and will be continuously diluted upon magma ascent.
DS1982-0503
1982
Ponsard, J.F.Ponsard, J.F., Lesquer, A., Villeneuve, M.Une Suture Panafricaine sur la Bordure Occidentale du Craton Ouest Africain.Comptes Rendus Seances Academy of Science Ser. 2, Mec. Phys. Chim. S, Vol. 295, No. 13, PP. 1161-1164.West Africa, Guinea, Sierra Leone, Mali, GermanyTectonics
DS2000-0773
2000
Ponte-Neto, C.F.Ponte-Neto, C.F., Ernesto, M.Paleomagnetism of the Cambrian dike swarm from Itabuna, southeastern border of Sao Francisco Craton.Igc 30th. Brasil, Aug. abstract only 1p.Brazil, BahiaMagnetism, Dike swarm
DS200612-1101
2006
Pontevivo, A.Pontevivo, A., Thybo, H.Test of the upper mantle low velocity layer in Siberia with surface waves.Tectonophysics, Vol. 416, 1-4, April 5, pp. 113-131.Russia, SiberiaGeophysics - seismics
DS1992-1218
1992
Ponzini, G.Ponzini, G., Tosi, N.A technique to test finite difference schemes to model some geophysical processes in a geological structureMathematical Geology, Vol. 24, No. 4, pp. 499-537GlobalGeophysics, Computer modeling
DS1989-1232
1989
Pool, R.Pool, R.Cold fusion: end of act IScience, Research News, Vol. 24, June 2, pp. 1039-1040. Database # 17978GlobalCold fusion, Brief overview
DS1990-1193
1990
Pool, R.Pool, R.Diamond films sparkle as they come to marketScience, Vol. 249, July 6, pp. 27, 28GlobalEconomics, CVD Chemical vapor deposi
DS1982-0627
1982
Pooley, G.D.Wass, S.Y., Pooley, G.D.Fluid Activity in the Mantle Evidence from Large Lherzolitexenoliths.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 229, (abstract.).AustraliaKimberlite
DS1995-0682
1995
Pooley, G.D.Griffin, B.J., Rissanen, J., Pooley, G.D., Lee, DearnA new Diamondiferous eclogite bearing kimberlitic occurrence from FinlandProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 198-200.FinlandEclogite
DS200512-0867
2005
Pooley, G.D.Pooley, G.D.Weathering of chromite.World Diamond Conference Nov. 23, Perth, 2p.Geochemistry - chromium spinel
DS2003-0575
2003
Pooley, S.Hell, A.J., Ramsay, W.R.H., Rheinberger, G., Pooley, S.The geology, age, mineralogy and near surface features of the Merlin kimberlites8ikc, Www.venuewest.com/8ikc/program.htm, Session 1 POSTER abstractAustraliaKimberlite geology and economics, Deposit - Merlin
DS200412-1618
2003
Pooley, S.Ramsay, W.R.H., Hell, A., Reinberger, G., Pooley, S.The geology, age, near surface features and mineralogy of the Merlin kimberlite field, Northern Territory, Australia.Geological Society of Australia Abstracts, Vol. 70, p. 54. 1p.Australia, Northern TerritoryDeposit overview - Merlin
DS201901-0087
2018
Poon, T.Wang, W., Poon, T.Canary yellow diamonds. Gems & Gemology, Sixth International Gemological Symposium Vol. 54, 3, Fall 1p. Abstract p. 262-3Africa, Sierra Leonedeposit - Zimmi

Abstract: Isolated nitrogen is one of the major defects in producing yellow color in natural diamonds. In regular type Ib yellow diamonds, isolated nitrogen is normally the dominant form, with limited aggregations in A centers (nitrogen pairs). Type Ib diamonds normally experienced strong plastic deformations. In addition to vacancy clusters, many other optic centers were introduced during annealing over their long geological history, such as GR1, NV, and H3 centers. Diamonds from the Zimmi area of West Africa are a typical example (Smit et al., 2016). As a result, clear brownish and greenish hues are common among these diamonds, so most do not possess true “canary” yellow color. Here we studied more than 2,000 diamonds with real canary yellow color. Their color origin and relationship with type Ib diamonds were explored. Sizes of the studied diamonds ranged from 0.01 to about 1.0 ct. They showed pure yellow color, with grades of Fancy Intense or Fancy Vivid yellow. Infrared absorption analysis showed that they were all type IaA with very high nitrogen concentrations, but a very weak absorption from isolated nitrogen at 1344 cm–1 was detected in all samples. Concentration of isolated nitrogen was estimated at ~2–3 ppm. This isolated nitrogen created smooth absorption in the ultraviolet-visible (UV-Vis) region, increasing gradually to the high-energy side. No other defects were detected using UV-Vis absorption spectroscopy, which explained the pure yellow color we observed. Fluorescence imaging revealed multiple nucleation centers with dominant green color, which was attributed to the S3 defects confirmed through photoluminescence analysis. Compared with natural type Ib diamonds, an outstanding feature of the studied samples is the absence of plastic deformation. For this reason, other vacancy-related defects were not introduced to these diamond lattices over the geological period after their formation. Sulfide inclusions are common in type Ib diamonds, but they were not observed in these canary stones. Instead, some calcite inclusions were observed. All the observations from this study indicated that the canary diamond samples were formed in a different geological environment than type Ib diamonds.
DS201112-0813
2011
Poore, H.Poore, H., White, N., Maclennan, J.Ocean circulation and mantle melting controlled by radial flow of hot pulses in the Iceland plume.Nature Geoscience, in press availableMantle, Europe, IcelandMelting
DS1984-0592
1984
Poornachandra, R.G.V.S.Poornachandra, R.G.V.S., Murthi, C.S., Bhalia, M.S.Paleomagnetism of Kimberlites Around Wajrakarur Anantapur District, Andhra Pradesh.Geophysical Research. Bulletin., Vol. 22, No. 2-3, PP. 105-116.India, Andhra PradeshGeophysics, Kimberlite
DS1992-1598
1992
Poorter, R.P.E.Varekamp, J.C., Kreulen, R., Poorter, R.P.E., Van bergen, M.J.Carbon sources in arc volcanism, with implications for the carbon cycleTerra Nova, Vol. 4, pp. 363-373GlobalArc volcanism., Carbon cycle
DS200812-0498
2008
Popa, C.Iancu, O.G., Cossio, R., Korsakov, A.V., Compagnoni, R., Popa, C.Cathodluminesence spectra of diamonds in UHP rocks from the Kokchetav Massif, Kazakhstan.Journal of Luminescence, Vol. 128, 10, pp. 1684-1688.Russia, KazakhstanSpectroscopy
DS1993-1212
1993
Popdkuyko, Yu.A.Pechnikov, V.A., Bobrov, V.A., Popdkuyko, Yu.A.Isotope composition of diamond and accompanying graphite from metamorphic rocks of northern Kazakhstan.(Russian)Geochemistry International (Geokhimiya), (Russian), Vol. 1993, No. 1, pp. 150-154.Russia, Kazakhstan, Commonwealth of Independent States (CIS)Geochronology, Diamond
DS1992-1219
1992
Pope, A.J.Pope, A.J., Thirlwall, M.F.Tectonic setting, age, and regional correlation of ultrabasic-ultrapotassic dykes in the northern Purcell Mountains, southeast British ColumbiaCanadian Journal of Earth Sciences, Vol. 29, No. 3, March pp. 523-530British ColumbiaUltrapotassic, Cross Creek kimberlite
DS1998-1179
1998
Pope, D.C.Pope, D.C., Willett, S.D.Thermal mechanical model for crustal thickening in the central Andes driven by ablative subductionGeology, Vol. 26, No. 6, June pp. 511-4Andes, Bolivia, ChileBolivian Altiplano, Western Cordillera, Chilean Puna, Orogenic belt, structure, lithosphere
DS201212-0667
2012
Pope, E.Sleep, N.H., Bird, D.K., Pope, E.Paleontology of Earth's mantle.Annual Review of Earth and Planetary Sciences, Vol. 40, pp. 277-300.MantlePaleontology
DS201312-0833
2013
Pope, E.Sleep, N.H., Bird, D.K., Pope, E.Paleontology of Earth's mantle. Mentions keywords as kimberlite, carbonatiteAnnual Review of Earth and Planetary Sciences, Vol. 40, pp. 277-300.MantleKimberlite, carbonatite
DS200712-1238
2007
Pope, E.C.Zhao, R., Zhang, R.Y., Liou, J.G., Booth, A.L., Pope, E.C., Chamberlain, C.P.Petrochemistry oxygen isotopes and U-Pb SHRIMP geochronology of mafic ultramafic bodies from the Sulu UHP terrane, China.Journal of Metamorphic Geology, Vol. 25, 2, pp. 207-224.ChinaUHP
DS201905-1082
2019
Pope, E.C.van der Meer, Q.H.A., Scott, J.M., Serre, S.H., Whitehouse, M.J., Kristoffersen, M., Le Roux, P.J., Pope, E.C.Low delta 18 O zircon xenocrysts in alkaline basalts; a window into the complex carbonatite-metasomatic history of the Zealandia lithospheric mantle.Geochimica et Cosmochimica Acta, Vol. 254, pp. 21-39.New Zealandmetasomatism

Abstract: Megacrystic zircon grains from alkaline basaltic fields are rare but can provide fundamental insights into mantle metasomatic processes. Here, we report in-situ U-Pb ages, trace element concentrations and hafnium and oxygen isotopes for fourteen zircon megacrysts from two intraplate alkaline basalt locations in New Zealand. U-Pb ages indicate the zircons crystallised between 12.1 and 19.8 Ma. Zircon oxygen isotopic compositions range from low to mantle-like compositions (grain average d ¹8 O = 3.8-5.1‰). Hafnium isotopes (eHf (t) = +3.3 to +10.4) mostly overlap with intraplate mafic rocks and clinopyroxene in metasomatized peridotitic mantle xenoliths but show no correlation with most trace element parameters or oxygen isotopes. The zircons are interpreted to have formed by the reaction between low-degree melts derived from pre-existing mantle metasomes and the depleted mantle lithosphere prior to eruption and transport to the surface. The low Hf concentration, an absence of Eu anomalies, and elevated U/Yb compared to Nb/Yb in the megacrystic zircons are interpreted to show that the source metasomes comprised subduction- and carbonatite-metasomatised lithospheric mantle. As these trace element characteristics are common for megacrystic zircon in intra-plate basaltic fields globally, they suggest the prevalence of subduction- and carbonatite-metsasomatised mantle under these intraplate volcanic regions. The unusually low d ¹8 O was likely present prior to metasomatic enrichment and may have resulted from high-temperature hydrothermal alteration during initial mantle lithosphere formation at a mid ocean ridge or, possibly, during subduction-related processes associated with continent formation. The combination of proportionally varied contributions from carbonatite- and subduction-metasomatised lithospheric melts with asthenospheric melts may explain the variety of primitive intraplate basalt compositions, including low d ¹8 O reported for some local intraplate lavas.
DS200712-0850
2006
Pope, S.Pope, S.High pressure, high temperature (HPHT) diamond processing: what is this technology and how does it affect colour?Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.120, abstract onlyTechnologyDiamond color
DS201912-2821
2019
Popescue, C.Sanatmaria-Perez, D., Ruiz-Fuertes, J., Pena-Alvarez, M., Chulia-Jordan, R., Marquerno, T., Zimmer, D., Guterrez-Cano, V., Macleod, S., Gregoryanz, E., Popescue, C., Rodriguez-Herandez, P., Munoz, A.Post-tilleyite, a dense calcium silicate carbonate phase.Nature Scientific Reports, Vol. 9, 11p. PdfMantletilleyite

Abstract: Calcium carbonate is a relevant constituent of the Earth’s crust that is transferred into the deep Earth through the subduction process. Its chemical interaction with calcium-rich silicates at high temperatures give rise to the formation of mixed silicate-carbonate minerals, but the structural behavior of these phases under compression is not known. Here we report the existence of a dense polymorph of Ca5(Si2O7)(CO3)2 tilleyite above 8 GPa. We have structurally characterized the two phases at high pressures and temperatures, determined their equations of state and analyzed the evolution of the polyhedral units under compression. This has been possible thanks to the agreement between our powder and single-crystal XRD experiments, Raman spectroscopy measurements and ab-initio simulations. The presence of multiple cation sites, with variable volume and coordination number (6-9) and different polyhedral compressibilities, together with the observation of significant amounts of alumina in compositions of some natural tilleyite assemblages, suggests that post-tilleyite structure has the potential to accommodate cations with different sizes and valencies.
DS201711-2500
2017
Pophare, A.M.Asthana, D., Kumar, S., Kumar Vind, A., Zehra, F., Kumar, H., Pophare, A.M.Geochemical fingerprinting of ~ 2.5 Ga forearc-arc-backarc related magmatic suites in the Bastar Craton, central India.Journal of Asian Earth Sciences, in press available, 17p.Indiageodynamics

Abstract: The Pitepani volcanic suite of the Dongargarh Supergroup, central India comprises of a calc-alkaline suite and a tholeiitic suite, respectively. The rare earth element (REE) patterns, mantle normalized plots and relict clinopyroxene chemistry of the Pitepani calc-alkaline suite are akin to high-Mg andesites (HMA) and reveal remarkable similarity to the Cenozoic Setouchi HMA from Japan. The Pitepani HMAs are geochemically correlated with similar rocks in the Kotri-Dongargarh mobile belt (KDMB) and in the mafic dykes of the Bastar Craton. The rationale behind lithogeochemical correlations are that sanukitic HMAs represent fore-arc volcanism over a very limited period of time, under abnormally high temperature conditions and are excellent regional and tectonic time markers. Furthermore, the tholeiitic suites that are temporally and spatially associated with the HMAs in the KDMB and in the mafic dykes of the Bastar Craton are classified into: (a) a continental back-arc suite that are depleted in incompatible elements, and (b) a continental arc suite that are more depleted in incompatible elements, respectively. The HMA suite, the continental back-arc and continental arc suites are lithogeochemically correlated in the KDMB and in the mafic dykes of the Bastar Craton. The three geochemically distinct Neoarchaean magmatic suites are temporally and spatially related to each other and to an active continental margin. The identification of three active continental margin magmatic suites for the first time, provides a robust conceptual framework to unravel the Neoarchaean geodynamic evolution of the Bastar Craton. We propose an active continental margin along the Neoarchaen KDMB with eastward subduction coupled with slab roll back or preferably, ridge-subduction along the Central Indian Tectonic Zone (CITZ) to account for the three distinct magmatic suites and the Neoarchean geodynamic evolution of the Bastar Craton.
DS201805-0933
2018
Pophare, A.M.Asthana, D., Kumar, S., Vind, A.K., Zehra, F., Kumar, H., Pophare, A.M.Geochemical fingerprinting of ~2.5 Ga forearc-arc-backarc related magmatic suites in the Bastar Craton, central India.Journal of Asian Earth Sciences, Vol. 157, pp. 218-234.IndiaCraton

Abstract: The Pitepani volcanic suite of the Dongargarh Supergroup, central India comprises of a calc-alkaline suite and a tholeiitic suite, respectively. The rare earth element (REE) patterns, mantle normalized plots and relict clinopyroxene chemistry of the Pitepani calc-alkaline suite are akin to high-Mg andesites (HMA) and reveal remarkable similarity to the Cenozoic Setouchi HMA from Japan. The Pitepani HMAs are geochemically correlated with similar rocks in the Kotri-Dongargarh mobile belt (KDMB) and in the mafic dykes of the Bastar Craton. The rationale behind lithogeochemical correlations are that sanukitic HMAs represent fore-arc volcanism over a very limited period of time, under abnormally high temperature conditions and are excellent regional and tectonic time markers. Furthermore, the tholeiitic suites that are temporally and spatially associated with the HMAs in the KDMB and in the mafic dykes of the Bastar Craton are classified into: (a) a continental back-arc suite that are depleted in incompatible elements, and (b) a continental arc suite that are more depleted in incompatible elements, respectively. The HMA suite, the continental back-arc and continental arc suites are lithogeochemically correlated in the KDMB and in the mafic dykes of the Bastar Craton. The three geochemically distinct Neoarchaean magmatic suites are temporally and spatially related to each other and to an active continental margin. The identification of three active continental margin magmatic suites for the first time, provides a robust conceptual framework to unravel the Neoarchaean geodynamic evolution of the Bastar Craton. We propose an active continental margin along the Neoarchaen KDMB with eastward subduction coupled with slab roll back or preferably, ridge-subduction along the Central Indian Tectonic Zone (CITZ) to account for the three distinct magmatic suites and the Neoarchean geodynamic evolution of the Bastar Craton.
DS1982-0504
1982
Popivnyak, I.V.Popivnyak, I.V., Simkiv, ZH. A.Soluable Components of Mantle Derived Mineral Forming MediaDoklady Academy of Science USSR, Earth Science Section., Vol. 256, No. 4, PP. 181-184.RussiaSytykan, Pyrope, Garnet, Kimberlite, Analyses, Fluid Inclusions
DS201412-0703
2013
Popkin, G.Popkin, G.Earth's plate boundaries may nurture diamond formation.Proceedings of National Academy of Science USA, 1p. Brief overviewMantleGeodynamics
DS1960-0728
1966
Popoff, C.C.Popoff, C.C.Computing reserves of mineral deposits : principles and conventionalmethods.out of print -xerox availableUsbm Information Circular, No. 8283, 113pUnited StatesReserves, Usa
DS1988-0549
1988
Popoff, M.Popoff, M.Benue trough oblique rifting, northeast Brasil interior basins and the geodynamic evolution of the equatorial domainof the south Atlantic.(in Portugese).Revista Brasileira de Geociencias, (in Portugese)., Vol. 18, No. 3, September p. 315. (abstract.)BrazilTectonics, Rifting
DS1975-0218
1976
Popolitov, E.I.Abramov, V.A., Popolitov, E.I.Geochemical Properties of Xenoliths of Upper Mantle RocksDoklady Academy of Science USSR, Earth Science Section., Vol. 231, No. 1-6, PP. 172-175.RussiaGeochemistry, Kimberlite, Garnet
DS200412-2180
2004
Popolitov, K.E.Yegorova, T.P., Stephenson, R.A., Kostyuchenko, S.L., Baranova, E.P., Satrostenko, V.I., Popolitov, K.E.Structure of the lithosphere below the southern margin of the East European Craton ( Ukraine and Russia) from gravity and seismiTectonophysics, Vol. 381, 1-4, pp. 81-100.Europe, UkraineTectonics
DS201806-1237
2018
Popov, A.A.Osei Tutu, A., Sobolev, S.V., Steinberger, B., Popov, A.A., Rogozhina, I.Evaluating the influence of plate boundary friction and mantle viscosity on plate velocities.Geochemistry, Geophysics, Geosystems, Vol. 19, 3, pp. 642-666.Mantlegeophysics - seismic
DS201603-0410
2015
Popov, A.G.Paktovskiy, Yu.G., Popov, A.G., Chaykovskiy, I.I. .New deposits in the Devonian diamond reservoirs of the northern Urals. *** IN RUSSIANProblems of Mineralogy, petrography and metallogeny , No. 18, pp. 286-289.RussiaDiamond occurrences ***
DS1991-1366
1991
Popov, A.M.Popov, A.M., Kiselev, A.I., Lepina, S.V.Magnetotelluric investigations in the Baikal region: deep structureSoviet Geology and Geophysics, Vol. 32, No. 4, pp. 93-100Russia, Lake BaikalTectonics, Structure
DS1992-0868
1992
Popov, A.M.Kiselev, A.I., Popov, A.M.Asthenospheric diapir beneath the Baikal rift: petrological constraintsTectonophysics, Vol. 208, pp. 287-295Russia, AsiaTectonics, Baikal rift, kimberlites
DS2000-0504
2000
Popov, A.M.Kislev, A.I., Popov, A.M.The Baikal Rift as a portrayal of dynamic, structural and compositional differences between lithosphere...Doklady Academy of Sciences, Vol. 371, No. 2, pp. 226-229.Russia, Siberia, AsiaSiberian Platform, Central Asian Mobile Belt, Geodynamics, Rifting
DS201312-0539
2013
Popov, D.Liang, Q., Meng, Y., Yan, C., Krasnicki, S., Lai, J., Hemawan, K., Shu,H., Popov, D., Yu,T., Yang, W., Mao, H., Hemley, R.Developments in synthesis, characterization, and application of large high-quality CVD single crystal diamond.Journal of Superhard Materials, Vol. 35, 4, pp. 195-213.TechnologyDiamond synthetics
DS2002-0124
2002
Popov, K.V.Bazylev, B.A., Popov, K.V., Shcherbakov, V.P.Petrographic features of oceanic peridotites as reflected by their magnetic characteristics.Russian Journal of Earth Science, Vol. 4, 3, JuneGlobalPetrography, Peridotites
DS1985-0339
1985
Popov, M.G.Khazov, R.A., Popov, M.G., Biske, N.S.Diatremes in Karelia.(russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 285, No. 4, pp. 975-977RussiaBlank
DS1993-0812
1993
Popov, M.G.Khazov, Ra., Biske, N.S., Popov, M.G.Megacrysts from explosion pipes of KareliaDoklady Academy of Sciences USSR, Earth Science Section, Vol. 318, No. 5, pp. 180-183Russia, Commonwealth of Independent States (CIS), Baltic ShieldMineralogy, Ladogite
DS1993-0813
1993
Popov, M.G.Khazovk, R., Biske, N.S., Popov, M.G.Megacrysts from explosion pipes of KareliaDoklady Academy of Sciences USSR, Earth Science, Vol. 318, pp. 180-184.RussiaBaltic shield
DS201312-0325
2013
Popov, M.G.Gorkovets, V.Y., Rudashevski, N.S., Rudashevski, V.N., Popov, M.G., Antonov, A.V.Indicator minerals of diamond in the lamproitic diatreme, Kostomuksha region, Karelia.Doklady Earth Sciences, Vol. 450, 1, pp. 475-478.Russia, KareliaLamproite
DS201807-1493
2013
Popov, M.G.Gorkovets, V.Ya., Rudashevskii, N.S., Rudashevsky, V.N., Popov, M.G., Antonov, A.A.Indicator minerals in the lamproitic diatreme, Kostomuksha region, Karelia. Doklady Earth Sciences , Vol. 450, 1, pp. 79-90.Russialamproite

Abstract: The mineralogy of a new lamproitic diatreme 200-250 m in diameter and 3 ga in area is studied in detail. The chemical and 3-D mineralogical analysis identify the diatreme rocks as strongly altered olivine lamproites with a large volume (50-60%) of xenoliths of strongly altered spinel (garnet) lherzolites and harzburgites-dunites. Numerous grains-xenocrysts of indicator minerals of diamond have been extracted from the heavy concentrates (the weight of the initial product is 742 g and the size is 100-500 µm) as a result of hydroseparation: (1) subcalcium (CaOav. 2.6 wt %) high-Cr (Cr2O3 av. 5.3 wt %) pyrope (50 grains); (2) chrome diopside (7 and 8 mol % of kosmochlor and jadeite components, respectively, >40 grains); (3) high-Cr chromite (Cr2O3 > 62 wt %); and (4) picroilmenite (MgO 12-13.8 wt %) and Cr-rutile (Cr2O3 1.1 wt %). Xenocrysts prove the mantle endogene (the level of garnet lherzolites) source of the magmatic center of lamproites and forecast the diamond potential of the new diatreme in the Kostomuksha ore district.
DS1975-0385
1976
Popov, M.I.Popov, M.I., Asatkin, V.B.The Nature of Deformation in Kimberlite Pipes and Veins Using the Siberian Region As an Example.Akad. Nauk Sssr Izv. Ser. Geol., Vol. 1976, No. 11, PP. 19-24.RussiaKimberlite
DS1975-0834
1978
Popov, M.I.Popov, M.I., Asatkin, V.B.Nature of deformation of channels of kimberlite pipes and veins ( in a region of Siberia).International Geology Review, Vol. 20, No. 8, pp. 942-6.Russia, SiberiaPipe - Pulses, Torn Bedding, Broken Bedding
DS201901-0008
2018
Popov, M.Y.Blank, V.D., Churkin, V.D., Kulnitsky, B.A., Perezhogin, I.A., Kirichenko, A.N., Erohin, S.V., Sorokin, P.B., Popov, M.Y.Pressure induced transformation of graphite and diamond to onions.Crystals MDPI, Vol. 8, 2, 8p. Doi.org/10.3390/cryst8020068Russiacarbon nanotubes

Abstract: In this study, we present a number of experiments on the transformation of graphite, diamond, and multiwalled carbon nanotubes under high pressure conditions. The analysis of our results testifies to the instability of diamond in the 55-115 GPa pressure range, at which onion-like structures are formed. The formation of interlayer sp3-bonds in carbon nanostructures with a decrease in their volume has been studied theoretically. It has been found that depending on the structure, the bonds between the layers can be preserved or broken during unloading.
DS200512-0781
2005
Popov, V.A.Nikiforov, A.V., Bolonin, A.V., Sugorakova, A.M., Popov, V.A., Lykhin, D.A.Carbonatites of central Tuva: geological structure and mineral and chemical composition.Geology of Ore Deposits, Vol. 47, 4, pp. 326-345.RussiaCarbonatite, geochemistry
DS200612-0980
2005
Popov, V.A.Nikiforov, A.V., Bolonin, A.V., Sugorakova, A.M., Popov, V.A., Lykhin, D.A.Carbonatites of central Tuva: geological structure and mineral and chemical composition.Geology of Ore Deposits, Vol. 47, 4, pp. 326-345.RussiaGeochemistry - carbonatites
DS200512-0929
2004
Popov, V.K.Sakhno, V.G., Maksimov, S.O., Popov, V.K., Sandimirova, G.P.Leucite basanites and potassium shonkinites of the Uglovoe Basin, southern Primorye.Doklady Earth Sciences, Vol. 399A, Nov-Dec. pp. 1322-1326.RussiaBasanites, Foidites
DS200612-0853
2006
Popov, V.K.Maksimov, S.O., Popov, V.K.The first finding of carbonatite tuffs in Cenozoic basaltic volcano of southeastern Primorye.Doklady Earth Sciences, Vol. 408, 4, pp. 617-622.RussiaCarbonatite
DS200712-0261
2007
Popov, V.L.Dobtresov, V.Y., Psakhe, S.G., Popov, V.L., Shilko, E.V., Granin, Timofeev,Astafurov, Dimaki, StarchevichIce cover of Lake Baikal as a model for studying tectonic processes in the Earth's crust.Doklady Earth Sciences, Vol. 413, 2, pp. 155-159.RussiaGeomorphology
DS1997-1025
1997
Popov, V.N.Sharapov, V.N., Cherepanov, A.N., Popov, V.N., Lobov, A.G.Dynamics of basic melt cooling during the filling of a funnel shaped intrusive chamber.Geochemistry International, Vol. 35, No. 1, pp. 10-22.GlobalMagma chambers, Experimental petrology
DS1970-0583
1972
Popov, V.S.Popov, V.S.Globular Texture in LamprophyresZap. Vses. Miner. Obshch., Vol. 101, No. 6, PP. 370-379.RussiaRelated Rocks
DS1991-1367
1991
Popov, V.S.Popov, V.S.The origin of primary crustal acid igneous rocksInternational Geology Review, Vol. 33, No. 2, Feb. pp. 150-161RussiaMantle, Ultramafic, boninite
DS1993-1255
1993
Popov, V.S.Popov, V.S., Yuzhu LiThe basanites of the Nuishan volcanic cone, east China, as a result of the partial melting of primitive lherzolites.Geochemistry International, Vol. 30, No. 4, pp. 45-53.ChinaBasanite
DS200812-0725
2008
Popova, D.M.Mavrin, S.A., Denisov, V.N., Popova, D.M., Skryleva, Kuznetsov, Nosukhin, Terentiev, Blank,V.D.Boron distribution in the subsurface region of heavily doped IIb type diamond.Physics and Chemistry of the Earth Parts A,B,C, Vol. 372, 21, pp. 3914-3918.TechnologyType IIb diamonds
DS201703-0429
2017
Popova, E.Popova, E., Lushnikov, S.G., Yakovenchuk, V.N.The crystal structure of loparite: a new acentric variety.Mineralogy and Petrology, in press availablePerovskite, REE

Abstract: The crystal structure of the cubic modification of the natural mineral loparite has been studied for the first time by the methods of the X-ray diffraction analysis (?MoK a radiation, 105 independent reflections with I > 3s(I), R = 0.041 in the anisotropic approximation). The structure belongs to the perovskite type (ABO 3) with the double period of the cubic unit cell, a = 7.767(1) Å (sp. gr. Pn3m; Z = 2 for the composition (Ca,Na,Ce)(Na,Ce)3(Ti,Nb)2Ti2O12. Period doubling is explained by ordering of cations both in the A and the B positions.
DS201801-0049
2017
Popova, E.A.Popova, E.A., Lushnikov, S.G., Yakovenchuk, V.N., Krivovichev, S.V.The crystal structure of loparite: a new acentric variety.Mineralogy and Petrology, Vol. 111, pp. 827-832.Russia, Kola Peninsuladeposit - Khibiny

Abstract: The crystal structure of a new structural variety of loparite (Na0.56Ce0.21La0.14Ca0.06Sr0.03Nd0.02Pr0.01)S=1.03(Ti0.83Nb0.15)S=0.98O3 from the Khibiny alkaline massif, Kola peninsula, Russia, was solved by direct methods and refined to R1 = 0.029 for 492 unique observed reflections with I > 2s(I). The mineral is orthorhombic, Ima2, a = 5.5129(2), b = 5.5129(2) and c = 7.7874(5) Å. Similarly to other perovskite-group minerals with the general formula ABO3, the crystal structure of loparite is based upon a three-dimensional framework of distorted corner-sharing BO6. The A cations are coordinated by 12 oxygen atoms and are situated in distorted cuboctahedral cavities. In contrast to the ideal perovskite-type structure (Pm3-m), the unit cell is doubled along the c axis and the a and b axes are rotated in the ab plane at 45o. The BO6 octahedron displays distortion characteristic for the d0 transition metal cations with the out-of-center shift of the B site. The symmetry reduction is also attributable to the distortion of the BO6 octahedra which are tilted and rotated with respect to the c axis. The occurrence of a new acentric variety of loparite can be explained by the pecularities of its chemical composition characterized by the increased content of Ti compared to the previously studied samples.
DS201701-0018
2016
Popova, L.P.Kargin, A.V., Nosova, A.A., Postnikov, A.V., Chugaev, A.V., Postnikova, O.V., Popova, L.P., Poshibaev, V.V., Sazonova, L.V., Dokuchaev, A.Ya., Smirnova, M.D.Devonian ultramafic lamprophyre in the Irkineeva Chadobets trough in the southwest of the Siberian platform: age, composition, and implications for diamond potential prediction.Geology of Ore Deposits, Vol. 58, 5, pp. 383-403.RussiaLamprophyre - aillikite

Abstract: The results of geochronological, mineralogical, petrographical, and geochemical study of the Ilbokich ultramafic lamprophyre are reported. The specific features in the mineral and chemical compositions of the studied ultramafic lamprophyre indicate that it can be regarded as a variety similar to aillikite, while other differences dominated by K-feldspar can be referred to damtjernite. According to Rb-Sr analysis, ultramafic lamprophyre dikes intruded at the turn of the Early and Middle Devonian, about 392 Ma ago. This directly proves the existence of Early Paleozoic alkali-ultramafic magmatism in the northern part of the southwest Siberian Platform. A finding of Devonian alkali-ultramafic lamprophyre is of dual predictive importance. On the one hand, it is indicative of the low probability of finding large diamond-bearing deposits in close association with aillikite. On the other hand, it can be indicative of a possible large Devonian diamond province in the studied territory, where diamondiferous kimberlite is structurally separated from aillikite.
DS201802-0223
2018
Popova, M.N.Boldyrev, K.N., Mavrin, B.N., Sherin, P.S., Popova, M.N.Bright luminescence of diamonds with GeV centers.Journal of Luminescence, Vol. 193, pp. 119-124.Technologyluminescence

Abstract: We report on the quantum yield (?) and decay time (t) measurements at room temperature for the bright red-orange (602 nm) luminescence from new germanium-vacancy (Ge-V) centers in nano- and microcrystalline diamonds synthesized at high pressure and high temperature. The values ? = 3 ± 1% and t = 6.2±0.2 ns were found. The Stokes shift measured as the energy difference between the maxima of the luminescence and luminescence excitation spectra is negligible. The relative intensity of the zero-phonon line constitutes up to 70% from the total intensity of the luminescence. Results of our ab initio DFT calculations for the ground-state electronic and vibrational structure of (Ge-V)? in diamond are presented and discussed.
DS200412-0696
2004
Popovchenko, S.E.Gornostayev, S.S., Walker, R.J., Hanski, E.J., Popovchenko, S.E.Evidence for the emplacement of ca. 3.0 Ga mantle derived mafic ultramafic bodies in the Ukrainian Shield.Precambrian Research, Vol. 132, 4, July 15, pp.349-362.Europe, UkraineTectonics, chromitite
DS1995-1511
1995
Popovici, G.Popovici, G., Wilson, R.G., Sung, T.Diffusion of boron, lithium, oxygen, hydrogen and nitrogen in type IIA natural diamonds.Journal of Applied Physics, Vol. 77, No. 10, May 15, pp. 5103-5106.GlobalDiamond, Mineralogy
DS2001-0355
2001
PoppGao, S., Kern, H., Jin, Popp, Jin, Zhang, ZhangPoisson's ratio of eclogite: the role of retrogressionEarth and Planetary Science Letters, Vol. 192, No. 4, pp. 523-31.GlobalEclogite - geochemistry, Poisson ratio
DS201012-0399
2010
Popp, F.Koller, F., Palfi, A.G., Szabo, Cs., Niku-Paavola, V., Popp, F.Alkaline rocks in the Aris area, central Namibia, Africa.International Mineralogical Association meeting August Budapest, abstract p. 571.Africa, NamibiaAlkaline rocks, phonolite chemistry
DS1992-1220
1992
Popp, R.K.Popp, R.K., Bryndzia, L. T.Statistical analysis of Fe3, Ti, and OH in kaersutite from alkalic Igneous rocks and mafic mantle xenoliths.American Mineralogist, Vol. 77, No. 11-12, November-December, pp. 1250-1257.GlobalMineralogy, Mantle xenoliths
DS1992-1221
1992
Popp, R.K.Popp, R.K., Bryndzia, L.T.Statistical analysis of iron, Ti and OH in kaersutite from alkalic igneous rocks and mafic mantle xenoliths.American Mineralogist, Vol. 77, pp. 1250-57.MantleXenoliths
DS2000-0982
2000
Popp, R.K.Virgo, D., Popp, R.K.Hydrogen deficiency in mantle derived phlogopitesAmerican Mineralogist, Vol. 85, pp. 753-9.NamibiaOkenyenya Igneous Complex - lamprophyre dyke, Kaersutite
DS200912-0423
2009
Popp, R.K.Lamb, W.M., Popp, R.K.Amphibole equilibration temperatures in mantle rocks: determining values of mantle alpha H2O and implications for mantle H2O contents.American Mineralogist, Vol. 94, 1, pp. 41-52.MantleWater
DS1992-0271
1992
Poppe, L.J.Commeau, J.A., Poppe, L.J., Commeau, R.F.Seperation and identification of the silt sized heavy mineral fraction insedimentsUnited States Geological Survey (USGS) Circ, No. 1071, 13pGlobalHeavy mineral sampling - not specific to diamonds, General interest ref
DS2001-0133
2001
PoppiBrigatti, M.F., Medici, L., Poppi, VaccaroCrystal chemistry of trioctahedral micas 1M from the Alto Paranaiba igneous provinceCanadian Mineralogist, Vol. 39, No. 5, Oct. pp. 1333-46.BrazilAlkaline rocks, Carbonatite
DS1993-0163
1993
Poppi, L.Brigatti, M.F., Contini, S., Capedri, S., Poppi, L.Crystal chemistry and cation ordering in pseudobrookite and armalcolite from Spanish lamproitesEuropean Journal of Mineralogy, Vol. 5, pp. 73-84GlobalLamproites, Geochemistry
DS200412-0207
2004
Poppi, L.Brigatti, M.R., Malferrari, D., Medici, L., Ottolini, L., Poppi, L.Crystal chemistry of apatites from the Tapira carbonatite complex, Brazil.European Journal of Mineralogy, Vol. 16, 4,pp. 677-685.South America, BrazilMineral chemistry
DS1991-1368
1991
Popplewell, G.Popplewell, G., Abate, R.The application of modular plants to diamond recovery #1The Canadian Mining and Metallurgical Bulletin (CIM Bulletin) ., Session, Vol. 84, No. 947, March p. 99. AbstractGlobalDiamond recovery, Mining applications-processing
DS1992-1222
1992
Popplewell, G.Popplewell, G., Smith, J.The application of modular plants to diamond recovery #2The Canadian Mining and Metallurgical Bulletin (CIM Bulletin), Vol. 85, No. 956, January pp. 58-63GlobalDiamond processing, Diamond recovery
DS1994-0761
1994
Popplewell, G.Henharen, P.A., Popplewell, G., Shirley, J.M., Stephenson, M.Diamond processing - design considerations for the Northwest TerritoriesBateman Preprint paper handout at The Canadian Institute of Mining, 40p.Northwest TerritoriesDiamond recovery, Mineral processing
DS1997-0990
1997
Popplewell, G.Rylatt, M.G., Poling, G.W., Popplewell, G.The northwest Territories diamonds project - diamond processing in the Canadian arcticThe Canadian Mining and Metallurgical Bulletin (CIM Bulletin) ., Vol. 90, No. 1015, Nov-Dec. p. 33.(paper 24p.)Northwest TerritoriesMineral processing, Deposit - Ektaki
DS201609-1737
2010
Popplewell, G.Popplewell, G.Orapa 3 plant conceptual design evolution in action ( let the ore dictate the plant that you build!!)The 4th Colloquium on Diamonds - source to use held Gabarone March 1-3, 2010, 28p.Africa, BotswanaDeposit - Orapa

Abstract: Commencing with the Pre-Feasibility Study (PFS) conclusions, the Orapa 3 process design evolved through a phase of value-engineering studies. An overall re-evaluation of the originally proposed process design was necessary both in order to address the interim increase in target throughput from 9.8 Mtpa to 12 Mtpa as well as to increase capital efficiency. In the interests of clarity, the PFS process design for Orapa 3 has been omitted from this paper, as it is no longer relevant. Recognition is however due to those engaged in earlier phases of the Orapa 3 project with respect to fundamental mass~balancing modelling; and ore and diamond characterisation, which fanned the basis for the process design that has evolved from feasibility study activities. The background context for Orapa 3 is of an operation expected to yield operating utilisation and revenue improvements relative to the Orapa 2 operation. Delivering these without undue penalties to capital and operating cost required a shift in thinking, trading excess installed capacity for flexible circuit configuration. The process design adopted is "layered", with the purpose of preserving Run Of Mine (ROM) throughput by reducing in-circuit arisings - particularly to the Dense Medium Separation (DMS) section - rather than simply installing additional DMS capacity on the expectation of low DMS availability. Elsewhere, the ability to monitor and maintain critical sizing activities - particularly desanding - without impact on overall plant throughput is intended to motivate operators to avoid the temptation to trade quality for quantity. At present, since an overall dynamic simulation of the Orapa 3 operation has still to be carried out, the design mass balance has been based on a relatively onerous combination of worst case feed type with 100% front-line process capacity in all plant sections. This means that, whilst the installed DMS capacity is based on routing 100% of sized scrubbing section product directly to the DMS, and with one DMS module always unavailable, the High Pressure Rolls Crushing (HPRC) capacity is based on allowing for 50% of this stream to be instead routed first to the HPRC section, at no more than 75% of maximum roll speed for the two units installed. This is an obvious "belt and braces" approach. Following the dynamic simulation exercise (currently in progress), it is likely that a less conservative approach will be taken. This will not affect the conceptual design of the process plant, being mostly an exercise in refining the number of DMS modules to be installed, and possibly reducing slightly the size of the HPRC roll units. Both of these will have positive capital and operating cost impacts. Page 215 The Southern African Institute of Mining and Metallurgy Diamonds - Source to Use 2010 G Popp/ewell andB Hae/else DMS capacity, despite being split into coarse and fiaes streams, consists of identical modules. Two of the nine modules are set-up to receive either coarse or fine feed, the only difference being that fines modules are rated at lower capacity than the same modules treating coarse feed. Final recovery section capacity is based on entirely wet primary diamond recovery technology. This greatly reduces both the cost of drying. a large amount of recovery section feed and the dust• management issues associated with dry recovery technology. In contrast to the Orapa 2 operations, a scavenginglauditgrease belt section is included as a diamond recovery "goal-keeper" and to provide a process assurance function.
DS1988-0550
1988
Popplewell, G.M.Popplewell, G.M., Burks, F.B.J.M.A review of the development of dense medium plant design in the diamond mining industry.Van Eck and Lurie, paper given at Third Samancor Symposium, 33p.GlobalDMS, rotary plans, jigs, Mineral processing - review
DS1999-0620
1999
Popplewell, G.M.Rylatt, M.G., Popplewell, G.M.Ekati diamond mine - background and developmentMining Engineering, Vol. 51, No. 1, Jan. pp. 37-43.Northwest TerritoriesMining, mineral processing, Deposit - Ekati
DS1983-0521
1983
Poprzeczny, J.Poprzeczny, J.Perth to Sparkle as Gem Centre #2Sunday Times (western Australia), JUNE 12TH.AustraliaDiamond Cutting, Industry
DS200612-1102
2005
Popular SciencePopular ScienceDoes life lurk in Earth's mantle?Popular Science, Vol. 267, 5, p. 42.MantleBiology
DS1989-1233
1989
Porada, H.Porada, H.Pan-African rifting and orogenesis in southern to equatorial Africa and eastern BrasilPrecambrian Research, Vol. 44, No. 2, August pp. 103-136South Africa, BrazilTectonics, Pangea
DS1970-0044
1970
Porath, H.Camfield, P.A., Gough, D.I., Porath, H.Magnetometer Array Studies in the Northwestern United States and Southwestern Canada.Geophys. Journal of Res. Astron. Soc., Vol. 22, No. 2, PP. 201-221.Montana, South Dakota, North DakotaGeophysics, Mid-continent
DS1970-0177
1970
Porath, H.Porath, H.Determination of Strike of Conductive Structures from Geomagnetic Variation Anomalies.Earth and Planetary Science Letters, Vol. 9, No. 1, PP. 29-33.GlobalMid Continent
DS1970-0178
1970
Porath, H.Porath, H., Oldenburg, D.W., Gough, D.I.Seperation of Magnetic Variation Fields and Conductive Structures in the Western United States.Geophys. Journal of Res. Astron. Soc., Vol. 19, No. 3, PP. 237-260.GlobalGeophysics, Mid-continent
DS1970-0183
1970
Porath, H.Reitzel, J.S., Gough, D.I., Porath, H., Anderson, C.W.Geomagnetic Deep Sounding and Upper Mantle Structure in The western United States.Geophys. Journal of Res. Astron. Soc., Vol. 19, No. 3, PP. 213-235.GlobalGeophysics, Mid-continent
DS1970-0387
1971
Porath, H.Porath, H.Magnetic Variation Anomalies and Seismic Low Velocity Zone In the Western United States.Journal of GEOPHYSICAL RESEARCH, Vol. 76, No. 11, PP. 2643-2648.GlobalMid Continent
DS1970-0388
1971
Porath, H.Porath, H., Gough, D.I.Mantle Conductive Structures in the Western United States from magnetometer Array Studies.Roy. Astron. Soc. Geophys. Journal, Vol. 23, No. 4, PP. 387-398.GlobalGeophysics, Mid-continent
DS1989-0959
1989
PorcelliMattey, D.P., Exley, R.A., Pillinger, C.T., Menzies, M.A., PorcelliRelationships between Carbon, Heleum, Strontium and neodymium isotopes in mantle diopsidesGeological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 2, pp. 913-921GlobalMantle xenoliths
DS2001-0942
2001
Porcelli, D.Porcelli, D., Halliday, A.N.The core as a possible source of mantle helium