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SDLRC - Scientific Articles all years by Author - I


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.
Searching this page for a specific term or authorIn your Firefox browser click Edit in the menu bar and then Find. In the Find box that shows up at the bottom of the web page enter your search term. Firefox will highlight all occurrences. This is particularly helpful when the author you are seeking was not the lead author by whom the compilation is sorted.
Sending or sharing a referenceThe left column (Posted/Published) has an embedded hyperlink for each reference. In Firefox, if you right click on it, you can obtain the link url for that reference's location within the page, which you can copy and paste into an email or any other document. You can also use the "share this link" option to tweet, facebook etc the link.
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
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years - I
Posted/
Published
AuthorTitleSourceRegionKeywords
DS201905-1024
2019
I.R.Doroshkevich, A.G., Chebotarev, D.A., Sharygin, V.V.. Prokopyev, I.R., Nikolenko, A.M.Petrology of alkaline silicate rocks and carbonatites of the Chuktukon massif, Chadobets upland, Russia: sources, evolution and relation to the Triassic Siberian LIP.Lithos, Vol. 332-333, pp. 245-260.Russiacarbonatite

Abstract: The petrogenesis of temporally and spatially associated carbonatitic and deeply derived carbonated alkaline silicate magmas provides an opportunity to gain insights into the nature of the deepest lithospheric mantle. The Chuktukon massif, which is part of the Chadobets alkaline ultramafic carbonatite complex (Chadobets upland, Siberian craton) is a carbonatite-melilitite-damtjernite intrusion, whose emplacement was coeval with the Siberian Traps large igneous province (LIP). In this study, the sources of the primary melts are examined, the petrogenetic evolution of the complex is reconstructed and the relationship with the Siberian LIP is also discussed. Isotopic and geochemical information indicate that the source for the Chuktukon primary melts was isotopically moderately depleted and the primarymelts were formed by lowdegree partial melting of garnet carbonated peridotite. Hydrothermal processes caused 18O- and 13C- enrichment. The weathering process was accompanied by trace element re-distribution and enrichment of the weathering crust in Zn, Th, U, Nb, Pb and REE, relative to the Chuktukon rocks and a change in radiogenic (Sr, Nd) isotope compositions.
DS201603-0402
2016
Iacono-Marziano, G.Moussallam, Y., Florian, P., Corradini, D., Morizet, Y., Sator, N., Vuilleumier, R., Guillot, B., Iacono-Marziano, G., Schmidt, B.C., Gaillard, F.The molecular structure of melts along the carbonatite-kimberlite-basalt compositional joint: CO (sub 2) and polymerisation.Earth and Planetary Science Letters, Vol. 434, pp. 129-140.TechnologyPetrology - experimental

Abstract: Transitional melts, intermediate in composition between silicate and carbonate melts, form by low degree partial melting of mantle peridotite and might be the most abundant type of melt in the asthenosphere. Their role in the transport of volatile elements and in metasomatic processes at the planetary scale might be significant yet they have remained largely unstudied. Their molecular structure has remained elusive in part because these melts are difficult to quench to glass. Here we use FTIR, Raman, 13C and 29Si NMR spectroscopy together with First Principle Molecular Dynamic (FPMD) simulations to investigate the molecular structure of transitional melts and in particular to assess the effect of CO2 on their structure. We found that carbon in these glasses forms free ionic carbonate groups attracting cations away from their usual ‘depolymerising’ role in breaking up the covalent silicate network. Solution of CO2 in these melts strongly modifies their structure resulting in a significant polymerisation of the aluminosilicate network with a decrease in NBO/Si of about 0.2 for every 5 mol% CO2 dissolved. This polymerisation effect is expected to influence the physical and transport properties of transitional melts. An increase in viscosity is expected with increasing CO2 content, potentially leading to melt ponding at certain levels in the mantle such as at the lithosphere-asthenosphere boundary. Conversely an ascending and degassing transitional melt such as a kimberlite would become increasingly fluid during ascent hence potentially accelerate. Carbon-rich transitional melts are effectively composed of two sub-networks: a carbonate and a silicate one leading to peculiar physical and transport properties.
DS201909-2065
2019
Iacono-Marziano, G.Nabyl, Z., Massuyeau, M., Gaillard, F., Tuduri, J., Iacono-Marziano, G., Rogerie, G., Le Trong, E., Di Carlo, I., Melleton, J., Bailly, L.REE-rich carbonatites immiscible with phonolitic magma.Goldschmidt2019, 1p. AbstractGlobalcarbonatite - REE

Abstract: uncommon type of magmatic rocks dominates by carbonate, are broadly enriched in rare earth elements (REE) relative to the majority of igneous silicate rocks. While more than 500 carbonatites are referenced worldwide [1], only a few contain economic REE concentrations that are widely considered as resulting from late magmatic-hydrothermal or supergene processes. Magmatic pre-enrichment, linked to the igneous processes at the origin of carbonatites, are, however, likely to contribute to the REE fertilisation. Field observations [1] and experimental surveys [2, 3] suggest that a large part of the carbonatite melts can be produced as immiscible liquids with silicate magmas. Experimental constraints reveals that such immiscibility processes can lead to both REE enrichments and depletions in carbonatites [2, 3], making the magmatic processes controlling REE enrichments unclear. Here we present results of high-pressure and hightemperature experiments, simultaneously addressing crystal fractionation of alkaline magmas and immiscibility between carbonate and silicate melts. The experimental data reveal that the degree of differentiation, controlling the chemical composition of alkaline melts is a key factor ruling the REE concentration of the coexisting immiscible carbonatites. The parameterization of the experimental data together with the compilation of geochemical data from various alkaline provinces show that REE concentrations similar to those of highly REE enriched carbonatites (SREE > 30000 ppm) can be produced by immiscibility with phono-trachytic melt compositions, while more primitive alkaline magma can only be immiscible with carbonatites that are not significantly enriched in REE.
DS202006-0940
2020
Iacono-Marziano, G.Nabyl, Z., Massuyeau, M., Gaillard, F., Tuduri, J., Iacono-Marziano, G., Rogerie, G., Le Trong, E., Di Carlo, I., Melleton, J., Bailly, L.A window in the course of alkaline magma differentiation conducive to immiscible REE-rich carbonatites.Geochimica et Cosmochimica Acta, in press available 57p. PdfMantlecarbonatite

Abstract: Rare earth element (REE) enrichments in carbonatites are often described as resulting from late magmatic-hydrothermal or supergene processes. However, magmatic pre-enrichment linked to the igneous processes at the origin of carbonatites are likely to contribute to the REE fertilisation. Experimental constraints reveals that immiscibility processes between carbonate and silicate melts can lead to both REE enrichments and depletions in carbonatites making the magmatic processes controlling REE enrichments unclear. We link REE contents of carbonatites to the magmatic stage at which carbonatites are separated from silicate magma in their course of differentiation. We present results of experiments made at pressure and temperature conditions of alkaline magmas and associated carbonatites differentiation (0.2-1.5 GPa; 725-975?°C; FMQ to FMQ?+?2.5), simultaneously addressing crystal fractionation of alkaline magmas and immiscibility between carbonate (calcio-carbonate type) and silicate melts (nephelinite to phonolite type). The experimental data shows that the degree of differentiation, controlling the chemical composition of alkaline melts, is a key factor ruling the REE concentration of the coexisting immiscible carbonate melts. In order to predict carbonate melt REE enrichments during alkaline magma differentiation, we performed a parameterisation of experimental data on immiscible silicate and carbonate melts, based exclusively on the silica content, the alumina saturation index and the alkali/alkaline-earth elements ratio of silicate melts. This parameterisation is applied to more than 1600 geochemical data of silicate magmas from various alkaline provinces (East African Rift, Canary and Cape Verde Islands) and show that REE concentrations of their potential coeval carbonatite melts can reach concentration ranges similar to those of highly REE enriched carbonatites (?REE?>?30 000?ppm) by immiscibility with phonolitic/phono-trachytic melt compositions, while more primitive alkaline magmas can only be immiscible with carbonatites that are not significantly enriched in REE.
DS2003-0615
2003
Iacumin, M.Iacumin, M., DeMin, A., Piccirillo, E.M., Bellieni, G.Source mantle heterogeneity and its role in the genesis of Late Archean Proterozoic (Earth Science Reviews, Vol. 62, 3-4, pp. 365-397.South AmericaMagmatism
DS200412-0864
2003
Iacumin, M.Iacumin, M., DeMin, A., Piccirillo, E.M., Bellieni, G.Source mantle heterogeneity and its role in the genesis of Late Archean Proterozoic ( 2.7 - 1.0 Ga) and Mesozoic (200 and 130 MaEarth Science Reviews, Vol. 62, 3-4, pp. 365-397.South AmericaMagmatism
DS201912-2830
2019
Iacumin, P.Toscani, L., Salvioli-Mariani, E., Mattioli, M., Tellini, C., Boschetti, T., Iacumin, P., Selmo, E.The pyroclastic breccia of the Cabezo Negro de Tallant ( SE Spain): the first finding of carbonatite volcanism in the internal domain of the Betic Cordillera.Lithos, in press available, 16p.Europe, Spaincarbonatite
DS2003-1368
2003
Iacumin, V.V.Teixeira, W., Pinese, J.P.P., Iacumin, V.V., Girardi, Piccirillo, Echevests, RibotCalc alkaline and tholeiitic dyke swarms of Tandilia, Rio de la Plat a Craton, Argentina:Precambrian Research, Vol. 119, 1-4, Dec. 20, pp. 329-353.ArgentinaTrans Amazonian Orogeny
DS201312-0467
2012
Iaffaldano, G.Kennett, B.L.N., Iaffaldano, G.Role of lithosphere in intra-continental deformation: Central Australia.Gondwana Research, Vol. 24, 3-4, pp. 958-968.AustraliaMantle dynamics
DS201512-1908
2015
Iaffaldano, G.Davies, D.R., Rawlinson, N., Iaffaldano, G., Campbell, I.H.Lithospheric controls on magma composition along Earth's longest continental hotspot track.Nature, Vol. 525, 7570, pp. 511-514.AustraliaCosgrove track

Abstract: Hotspots are anomalous regions of volcanism at Earth’s surface that show no obvious association with tectonic plate boundaries. Classic examples include the Hawaiian-Emperor chain and the Yellowstone-Snake River Plain province. The majority are believed to form as Earth’s tectonic plates move over long-lived mantle plumes: buoyant upwellings that bring hot material from Earth’s deep mantle to its surface1. It has long been recognized that lithospheric thickness limits the rise height of plumes2, 3, 4 and, thereby, their minimum melting pressure. It should, therefore, have a controlling influence on the geochemistry of plume-related magmas, although unambiguous evidence of this has, so far, been lacking. Here we integrate observational constraints from surface geology, geochronology, plate-motion reconstructions, geochemistry and seismology to ascertain plume melting depths beneath Earth’s longest continental hotspot track, a 2,000-kilometre-long track in eastern Australia that displays a record of volcanic activity between 33 and 9 million years ago5, 6, which we call the Cosgrove track. Our analyses highlight a strong correlation between lithospheric thickness and magma composition along this track, with: (1) standard basaltic compositions in regions where lithospheric thickness is less than 110 kilometres; (2) volcanic gaps in regions where lithospheric thickness exceeds 150 kilometres; and (3) low-volume, leucitite-bearing volcanism in regions of intermediate lithospheric thickness. Trace-element concentrations from samples along this track support the notion that these compositional variations result from different degrees of partial melting, which is controlled by the thickness of overlying lithosphere. Our results place the first observational constraints on the sub-continental melting depth of mantle plumes and provide direct evidence that lithospheric thickness has a dominant influence on the volume and chemical composition of plume-derived magmas.
DS200512-0459
2005
Iafrica.comIafrica.comGold and diamond mines hit by the Rand.Iafrica.com, March 7, 1p.Africa, South AfricaNews item - De Beers
DS201112-0461
2011
Iafrica.comIafrica.comState will ruin mines. NationalizationIafrica.com, August 3, 1/2p.Africa, South AfricaNews item - legal
DS200412-1197
2004
Iakoubovskii, K.Maes, J., Iakoubovskii, K., Hayne, M., Stesmans, A., Moshchalkov, V.V.Diamond as a magnetic field calibration probe.Journal of Physics D: Applied Physics, Vol. 37, 7, April 7, pp. 1102-1106.TechnologyGeophysics - magnetics
DS1985-0585
1985
Iakovlev, E.N.Samolov, M.I., Sokolina, G.A., Iakovlev, E.N.Specific Features of Graphite-diamond Phase TransformationDoklady Academy of Sciences Nauk SSSR., Vol. 282, No. 3, PP. 617-619.RussiaMineralogy
DS1988-0501
1988
Iakovlev, J.V.Nekrasov, I.J., Iakovlev, J.V., Pavlova, L.A., Gotovtse, V.V.Uncommon inclusions in native gold from Mir pipe kimberlites. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 303, No. 5, pp. 1209-1213RussiaGold, Deposit -Mir
DS200812-0498
2008
Iancu, O.G.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
DS201312-0178
2013
Iandelli, I.Corti, G., Iandelli, I., Cerca, M.Experimental modeling of rifting at craton margins.Geosphere, Vol. 9, pp. 138-154.MantleCraton, tectonics
DS201112-0695
2011
Iarocci, A.Mollo, S., Vinciguerra, S., Lezzi, G., Iarocci, A., Scarlato, P., Heap, M.J., Dingwell, D.B.Volcanic edifice weakening via devolatization reactions.Geophysical Journal International, In press, availableMantleVolcanism - not specific to diamonds
DS201609-1723
2016
Iarotsky, L.Jaupart, C., Mareschal, J-C., Iarotsky, L.Radiogenic heat production in the continental crust.Lithos, Vol. 262, pp. 398-427.MantleThermometry

Abstract: Heat flow and heat production data complement seismic information and provide strong constraints on crustal composition, thickness and evolution. They have helped understand the nature of the Mohorovicic discontinuity and the variations in seismic velocities below the Moho. Notably, heat flow studies have delineated the vertical distribution of heat producing elements throughout the crust and in the upper most mantle lithosphere. Analysis of global data sets on heat flow and crustal thickness demonstrate that there is no correlation between these two variables. This is due to the large spatial variations in crustal composition and heat production that exist within a single geological province. For a given crustal thickness, the Moho temperature varies within a wide range (˜ 300 K) depending on surface heat flux and crustal heat production. Thus one cannot use generic models based on a “type” crustal column to calculate crustal geotherms. In stable regions, lower crustal temperatures depend on the amount and vertical distribution of heat producing elements in the crust. These temperatures determine the conditions of crustal stability and impose a limit on the maximum thickness of a stabilized crust.
DS1988-0316
1988
Ibarguchi, J.I. Gil.Ibarguchi, J.I. Gil.The International eclogite field symposium 1987: The western gneissregion, NorwayTerra Cognita, Eclogite conference, Vol. 8, No. 3, Summer, pp. 277-279GlobalBrief: Outlines of presentations, Eclogites
DS2002-1399
2002
Ibarguchi, J.I.G.Santos, J.F., Scharer, U., Ibarguchi, J.I.G., GirardeauGenesis of pyroxenite rich peridotite at Cabo Ortegal : geochemical and Pb Sr Nd isotope data.Journal of Petrology, Vol. 43, No. 1, pp. 17-44.SpainPyroxenite, lead, strontium, neodynium, Petrology
DS201212-0204
2012
IbarraFlor De Lis, M., Stitch, Morales, Juli, Diaz, Cordoba, Pulgar, Ibarra, Harnafi, Gonzalez-LodeiroCrustal thickness variations in northern Morocco.Journal of Geophysical Research, Vol. 117, B2, B02312.Africa, MoroccoGeophysics - seismics
DS1982-0012
1982
Ibarrola, E.Ancochea, F., Ibarrola, E.Geochemical Characteristics of Volcanism in Central Spain.*spaBol. de la Real Soc. Espanola de Historia Natural, *SPA., Section Geologia, Vol. 80, No. 1-4, pp. 57-88GlobalLeucitite, Melilitite, Campos De Calatava
DS2000-0077
2000
Ibinger, P.D.Bell, D.R., Ibinger, P.D.The isotopic composition of hydrogen in nominally anhydrous mantle mineralsGeochimica et Cosmochimica Acta, Vol. 64, No. 12, June 1, pp. 2109-18.MantleGeochronology, Hydrogen
DS2003-0616
2003
Ibinger, P.D.Ibinger, P.D., Watkins, J.M., Burton, B.R.The character of Cordileran magmatism in the Eocene, insights from the SweetgrassGeological Association of Canada Annual Meeting, Abstract onlyMontanaMagmatism - alkaline
DS200412-0865
2003
Ibinger, P.D.Ibinger, P.D., Watkins, J.M., Burton, B.R.The character of Cordilleran magmatism in the Eocene, insights from the Sweetgrass Hills, Mt.Geological Association of Canada Annual Meeting, Abstract onlyUnited States, MontanaMagmatism - alkaline
DS202004-0500
2020
Ibough, H.Ba, M.H., Ibough, H., Lo, K., Youbi, N., Jaffal, M., Ernst, R.E., Niang, A.J., Dia, I., Abdeina, E.H., Bensalah, M.K., Boumehdi, M.A., Soderlund, U.Spatial and temporal distribution patterns of Precambrian mafic dyke swarms in northern Mauritania ( West African Craton): analysis and results fro remote sensing interpretation, geographical information systems ( GIS), Google Earth TM images, and regionaArabian Journal of Geosciences, Vol. 13, , 209 orchid.org/ 0000-002-3287-9537Africa, Mauritaniacraton

Abstract: We used remote sensing, geographical information systems, Google Earth™ images, and regional geology in order to (i) improve the mapping of linear structures and understand the chronology of different mafic dyke swarms in the Ahmeyim area that belongs to the Archean Tasiast-Tijirit Terrane of the Reguibat Shield, West African craton, NW Mauritania. The spatial and temporal distributions with the trends of the dyke swarms provide important information about geodynamics. The analysis of the mafic dyke swarms map and statistical data allow us to distinguish four mafic dyke swarm sets: a major swarm trending NE-SW to NNE-SSW (80%) and three minor swarms trending EW to ENE-WSW (9.33%), NW-SE to WNW-ESE (9.06%), and NS (1.3%). The major swarms extend over 35 km while the minor swarms do not exceed 13 km. The Google Earth™ images reveal relative ages through crossover relationships. The major NE-SW to NNE-SSW and the minor NS swarms are the oldest generations emplaced in the Ahemyim area. The NW-SE-oriented swarm dykes which are cutting the two former swarms are emplaced later. The minor E-W to WSW-ENE swarms are probably the youngest. A precise U-Pb baddeleyite age of 2733?±?2 Ma has been obtained for the NNE-SSW Ahmeyim Great Dyke. This dyke is approximately 1500 m wide in some zone and extends for more than 150 km. The distinct mafic dyke swarms being identified in this study can potentially be linked with coeval magmatic events on other cratons around the globe to identify reconstructed LIPs and constrain continental reconstructions.
DS200712-0972
2007
Ibrahim, K.M.Shaw, J.E., Baker, J.A., Kent, A.J.R., Ibrahim, K.M., Menzies, M.A.The geochemistry of the Arabian lithospheric mantle - a source for intraplate volcanism.Journal of Petrology, Vol. 48, 8, pp.1495-1512.AfricaMagmatism
DS200712-0973
2007
Ibrahim, K.M.Shaw, J.E., Baker, J.A., Kent, A.J.R., Ibrahim, K.M., Menzies, M.A.The geochemistry of the Arabian lithospheric mantle - a source for intraplate volcanism.Journal of Petrology, Vol. 48, 8, pp.1495-1512.AfricaMagmatism
DS1994-0803
1994
ICA GazetteICA GazetteThe 1995 ICA World Gemstone mining reportIca Gazette, December p. 1, 12-19.GlobalGemstones, Mining report
DS1993-0709
1993
ICAM93ICAM93Mineralogy in the service of mankindIcam 93 Program And Abstracts, Held May 31-June 2, Freemantle, AustAustraliaTable of contents, Mineralogy
DS201709-1984
2017
Ichangi, D.Feneyrol, J., Giuliani, G., Demaiffe, D., Ohenstetter, D., Fallick, A.E., Dubessy, J., Martelet, J-E., Rakotondrazafy, A.F.M., Omito, E., Ichangi, D., Nyamai, C., Wamunyu, W.Age and origin of the tsavorite and tanzanite mineralozing fluids in the Neoproterozoic Mozambique metamorphic belt.The Canadian Mineralogist, Vol. 55, pp. 763-786.Africa, Kenya, Tanzania, Madagascartanzanite

Abstract: The genetic model previously proposed for tsavorite- (and tanzanite-) bearing mineralization hosted in the Neoproterozoic Metamorphic Mozambique Belt (stretching from Kenya through Tanzania to Madagascar) is refined on the basis of new Sm-Nd age determinations and detailed Sr-O-S isotope and fluid-inclusion studies. The deposits are hosted within meta-sedimentary series composed of quartzites, graphitic gneisses, calc-silicate rocks intercalated with meta-evaporites, and marbles. Tsavorite occurs either in nodules (also called “boudins”) oriented parallel to the metamorphic foliation in all of the deposits in the metamorphic belt or in quartz veins and lenses located at the hinges of anticlinal folds (Lelatema fold belt and Ruangwa deposits, Tanzania). Gem tanzanite occurs in pockets and lenses in the Lelatema fold belt of northern Tanzania. The Sm-Nd isotopic data for tsavorites and tanzanites hosted in quartz veins and lenses from Merelani demonstrate that they formed at 600 Ma, during the retrograde metamorphic episode associated with the East African Orogeny. The tsavorites hosted in nodules do not provide reliable ages: their sedimentary protoliths had heterogeneous compositions and their Sm-Nd system was not completely rehomogenized, even at the local scale, by the fluid-absent metamorphic recrystallization. The initial 87Sr/86Sr isotopic ratios of calcite from marble and tanzanites from Merelani fit with the strontium isotopic composition of Neoproterozoic marine carbonates. Seawater sediment deposition in the Mozambique Ocean took place around 720 Ma. The quartz-zoisite O-isotopic thermometer indicates a temperature of formation for zoisite between 385 and 448 °C. The sulfur isotopic composition of pyrite (between –7.8 and –1.3‰ V-CDT) associated with tsavorite in the Lelatema fold belt deposits suggests the contribution of reduced marine sulfate. The sulfur in pyrite in the marbles was likely derived from bacterial sulfate reduction which produced H2S. Fluid inclusion data from tsavorite and tanzanite samples from the Merelani mine indicate the presence of a dominant H2S-S8±(CH4)±(N2)±(H2O)-bearing fluid. In the deposits in Kenya and Madagascar, the replacement of sulfate by tsavorite in the nodules and the boron isotopic composition of tourmaline associated with tsavorite are strong arguments in favor of the participation of evaporites in garnet formation.
DS1991-0761
1991
Ichangi, D.W.Ichangi, D.W., MacLean, W.H.The Archean volcanic facies in the Migori segment, Nyanza greenstone @Kenya: stratigraphy, geochemistry and mineralizationJournal of African Earth Sciences, Vol. 13, No. 3-4, pp. 277-290KenyaGreenstone belt -Nyanza, Mineralization
DS201212-0581
2012
Ichert-Toft, J.Reid, M.R., Boucher, R.A., Ichert-Toft, J., Levander, A., Liu, K., Miller, M.S., Ramos, F.C.Melting under the Colorado Plateau, USA.Geology, Vol. 40, 5, pp. 387-390.United States, Colorado PlateauMelting
DS1995-0836
1995
Ichihashi, T.Ichihashi, T., Miyano, T.An unique P-T trajectory of the Limpopo Central Zone with tectonic setting deeper to the marginal zones.Centennial Geocongress (1995) Extended abstracts, Vol. 1, p. 178-180. abstractZimbabweTectonics, Beitbridge area
DS201312-0413
2013
Ichikawa, H.Ichikawa, H., Kameyama, M., Kawai, K.Mantle convection with continental drift and heat source around the mantle transition zone.Gondwana Research, Vol. 24, 3-4, pp. 1080-1090.MantleSubduction
DS201412-0389
2014
Ichikawa, H.Ichikawa, H., Kameyama, M., Senshu, H., Kawai, K., Maruyama, S.Influence of majorite on hot plumes.Geophysical Research Letters, Vol. 26, pp. 461-468.MantleHotspots
DS201612-2278
2016
Ichikawa, H.Azuma, S., Yamamoto, S., Ichikawa, H., Maruyama, S.Why primordial continents were recycled to the deep: role of subduction erosion.Geoscience Frontiers, in press availableMantleSubduction

Abstract: Geological observations indicate that there are only a few rocks of Archean Earth and no Hadean rocks on the surface of the present-day Earth. From these facts, many scientists believe that the primordial continents never existed during Hadean Earth, and the continental volume has kept increasing. On the other hand, recent studies reported the importance of the primordial continents on the origin of life, implying their existence. In this paper, we discussed the possible process that could explain the loss of the primordial continents with the assumption that they existed in the Hadean. Although depending on the timing of the initiation of plate tectonics and its convection style, subduction erosion, which is observed on the present-day Earth, might have carried the primordial continents into the deep mantle.
DS201612-2304
2016
Ichikawa, H.Ichikawa, H., Greaux, S., Azuma, S.Subduction of the primordial crust into the deep mantle.Geoscience Frontiers, in press availableMantleSubduction

Abstract: The primordial crust on the Earth formed from the crystallization of the surface magma ocean during the Hadean. However, geological surveys have found no evidence of rocks dating back to more than 4 Ga on the Earth's surface, suggesting the Hadean crust was lost due to some processes. We investigated the subduction of one of the possible candidates for the primordial crust, anorthosite and KREEP crust similar to the Moon, which is also considered to have formed from the crystallization of the magma ocean. Similar to the present Earth, the subduction of primordial crust by subduction erosion is expected to be an effective way of eliminating primordial crust from the surface. In this study, the subduction rate of the primordial crust via subduction channels is evaluated by numerical simulations. The subduction channels are located between the subducting slab and the mantle wedge and are comprised of primordial crust materials supplied mainly by subduction erosion. We have found that primordial anorthosite and KREEP crust of up to ~50 km thick at the Earth's surface was able to be conveyed to the deep mantle within 0.1-2 Gy by that mechanism.
DS2001-0499
2001
Ichiki, M.Ichiki, M., Uyeshima, M., Utada, Guoze, Zi, MingzhiUpper mantle conductivity structure of the back arc region beneath northeastern ChinaGeophysical Research Letters, Vol. 28, No. 19, Oct. 1, pp. 3773-76.China, northeastTectonics
DS200612-0617
2006
Ichiki, M.Ichiki, M., Baba, K., Obayashi, M., Utada, H.Water content and geotherm in the upper mantle above the stagnant slab: interpreation of electrical conductivity and seismic P wave velocity models.Physics of the Earth and Planetary Interiors, Vol. 155, 1-2, April 14, pp. 1-15.MantleGeothermometry, harzburgite, back arc volcanism
DS1990-0145
1990
Ichwan, Z.Baafi, E.Y., Ichwan, Z.A fortran based microcomputer screen handling system for miningapplicationsAmerican Institute of Mining, Metallurgical, and Petroleum Engineers (AIME) Preprint, No. 90-93, 6pGlobalGeostatistics, Mining applications
DS201012-0301
2010
Ickert, R.Ickert, R., Stern, R., Stachel, T.MC Hr Sims oxygen isotope analysis of ferropericlase inclusions in diamond.Goldschmidt 2010 abstracts, abstractTechnologyDiamond morphology
DS201112-0684
2011
Ickert, R.B.Miskovic, A., Ickert, R.B., Pearson, D.G., Stern, R.A.Oxygen isotope survey of the Northern Canadian lithospheric mantle: implications for the evolution of cratonic roots.Yellowknife Geoscience Forum Abstracts for 2011, abstract p. 64-65.Canada, Northwest TerritoriesSCLM - geodynamics
DS201212-0585
2012
Ickert, R.B.Riches, A.J.V., Pearson, D.G., Stern, R.A., Ickert, R.B., Kjarsgaard, B.A., Jackson, S.E., Ishikawa, A.Multi-stage metasomatism of a Roberts Victor eclogite linked to the formation and destruction of diamond.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, South AfricaDeposit - Roberts Victor
DS201212-0668
2012
Ickert, R.B.Smart, K.A., Chacko, T., Stachel, T., Tappe, S., Muehlenbachs, K., Ickert, R.B., Stern, R.A.Jericho eclogite formation revealed by diamond inclusions: oceanic origin without crustal signature?10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractCanada, NunavutDeposit - Jericho
DS201212-0669
2012
Ickert, R.B.Smart, K.A., Chacko, T., Stachel, T., Tappe, S., Stern, R.A., Ickert, R.B.Eclogite formation beneath the northern Slave Craton constrained by diamond inclusions: oceanic lithosphere origin without a crustal signature.Earth and Planetary Science Letters, Vol. 319-320, pp. 165-177.Canada, Northwest TerritoriesDiamond inclusions
DS201312-0415
2013
Ickert, R.B.Ickert, R.B., Stachel, T., Stern, R.A., Harris, J.W.Diamond from recycled crustal carbon documented by coupled delta 18 O-delta 13 C measurements of diamonds and their inclusions.Earth and Planetary Science Letters, Vol. 364, pp. 85-97.MantleDiamond inclusions
DS201312-0838
2013
Ickert, R.B.Smit, K.V., Stachel, T., Creaser, R.A., Ickert, R.B., Dufrane, S.A., Stern, R.A., Seller, M.Origin of eclogite and pyroxenite xenoliths from the Victor kimberlite, Canada, and implications for Superior Craton formation.Geochimica et Cosmochimica Acta, Vol. 125, pp. 308-337.Canada, OntarioDeposit - Victor
DS201412-0845
2014
Ickert, R.B.Smit, K.V., Stachel, T., Creaser, R.A., Ickert, R.B., DuFrane, S.A., Stern, R.A., Seller, M.Origin of eclogite and pyroxenite xenoliths from the Victor kimberlite, Canada, and implications for Superior craton formation.Geochimica et Cosmochimica Acta, Vol. 125, pp. 308-337.Canada, Ontario, AttawapiskatDeposit - Victor
DS201507-0316
2015
Ickert, R.B.Ickert, R.B., Stachel, T., Stern, R.A., Harris, J.W.Extreme 18O-enrichment in majorite constrains a crustal origin of transition zone diamonds.Geochemical Perspectives Letters, 1, pp. 65-74.Africa, South AfricaDeposit - Jagersfontein
DS201601-0040
2015
Ickert, R.B.Riches, A.J.V., Ickert, R.B., Pearson, D.G., Stern, R.A., Jackson, S.E., Ishikawa, A.In situ oxygen isotope, major-, and trace element constraints on the metasomatic modification and crustal origin of a Diamondiferous eclogite from Roberts Victor, Kaapvaal Craton.Geochimica et Cosmochimica Acta, in press available, 45p.Africa, South AfricaDeposit - Roberts Victor
DS201603-0417
2016
Ickert, R.B.Riches, A.J.V., Ickert, R.B., Pearson, D.G., Stern, R.A., Jackson, S.E., Ishikawa, A., Kjarsgaard, B.A., Gurney, J.J.In situ oxygen-isotope, major, and trace element constraints on the metasomatic modification and crust origin of a Diamondiferous eclogite from Roberts Victor, Kaapvaal craton.Geochimica et Cosmochimica Acta, Vol. 174, pp. 345-359.Africa, South AfricaDeposit - Roberts Victor
DS201902-0310
2018
Ickert, R.B.Regier, M.E., Miskovic, A., Ickert, R.B., Pearson, D.G., Stachel, T., Stern, R.A., Kopylova, M.An oxygen isotope test for the origin of Archean mantle rootsGeochemical Perspectives Letters, Vol. 9, pp. 6-10. 10.7185/geochemlet.1830Mantleperidotites

Abstract: The origin of the peridotites that form cratonic mantle roots is a central issue in understanding the history and survival of Earth’s oldest continents. A long-standing hypothesis holds that the unusual bulk compositions of some cratonic peridotites stem from their origin as subducted oceanic serpentinite, dehydrated during subduction to form rigid buoyant keels (Schulze, 1986; Canil and Lee, 2009). We present oxygen isotope data from 93 mantle peridotites from five different Archean cratons to evaluate their possible origin as serpentinites. Cratonic mantle peridotite shows remarkably uniform d18O values, identical to modern MORB-source mantle, that do not vary with bulk rock Si-enrichment or Ca-depletion. These data clearly conflict with any model for cratonic lithosphere that invokes serpentinite as a protolith for cratonic peridotite, and place additional constraints on cratonic mantle origins. We posit that the uniform d18O was produced by sub-arc and/or MOR depletion processes and that the Si-enriched nature of some samples is unlikely to be related to slab melt infiltration. Instead, we suggest a peridotitic source of Si-enrichment, derived from ascending mantle melts, or a water-fluxed depleted mantle. These variably Si-enriched, cratonic mantle protoliths were then collisionally compressed into the thick cratonic roots that have protected Earth’s oldest continental crust for over 2.5 Gyr.
DS201012-0302
2010
ICMMICMMIndigenous people and mining.ICMM, 132p. www.icmm.comGlobalBook - CSR
DS201012-0303
2010
ICMMICMMLeadership matters: managing fatal risk guidance. Steps to take to ensure best practices. GuidelinesICMM, April 1, 12p.GlobalMining - corporate social responsibility
DS201012-0304
2009
ICMMICMMLeadership matters: the elimination of fatalities. GuidelinesICMM, Nov. 6p.GlobalMining - corporate social responsibility
DS201012-0305
2010
ICMMICMMNamdeb Diamond Corporation - Sperrgebeit, Namibia.ICMM , p. 20-21.Africa, NamibiaMining activity
DS201012-0306
2010
ICMMICMMDe Beers Marine - Kleinzee and Alexander Bay sea areas.ICMM, p. 18-19.Africa, South AfricaMining activity
DS201112-0462
2011
ICMMICMMImplementation Guidance Tools.... challenges .ICMM, Sept. 98p.GlobalBook - CSR
DS201112-0463
2011
ICMMICMMMining: partnerships for development TOOLKIT updated.ICMM, 180p. pdf. from websiteGlobalCSR
DS201112-0464
2011
ICMMICMMGuiding principles for the implementation of the UN protect, respect and remedy framework.ICMM, Feb. 1, 2p.GlobalNews item - legal
DS201212-0325
2012
ICMMICMMTrends in the mining and metals industry.ICMM, October 16p.GlobalSustainable development
DS201212-0326
2012
ICMMICMMThe role of mining in national economies.ICMM, October 20p.GlobalEconomics
DS201312-0416
2012
ICMMICMMOverview of leading indicators for occupational health and safety in mining.ICMM, Dec. 56p.GlobalOverview - health & safety parameters
DS201312-0417
2013
ICMMICMMAnnual review 2012. Integrity core, accountability, respect, collaboration.ICMM, March 14, 32p.GlobalReview of global CSR
DS201312-0418
2013
ICMMICMMHealth and safety conference report - held Santiago Chile Nov. 2012ICMM, Nov. 52p.GlobalConference - health and safety
DS201312-0419
2013
ICMMICMMResponsible reporting of mineral assets.ICMM, April 4p. PdfGlobalCRIRSCO
DS201312-0420
2013
ICMMICMMIndigenous peoples and mining.ICMM, May 6p. PdfGlobalCSR
DS201312-0421
2013
ICMMICMMThe mining sector in Brazil: building institutions for sustainable development.ICMM, May 116p. PdfSouth America, BrazilCSR
DS201312-0422
2013
ICMMICMMGood practice newsletter.ICMM, May, 12p.GlobalExtractive industries transparency
DS201412-0390
2014
ICMMICMMMaterials stewardship toolkit - maximizing value themes area 1) systems perspective (life cycle) 2) building relationships ( value chain) 3) understanding materials ( valuable and environmental risks) 4) sharing dat a ( public dat a and information).ICMM, 40p. FREEGlobalCorporate Responsible Sustainability
DS201412-0391
2014
ICMMICMMStrengthening community relations.ICMM, Ann. Rept. 13p.GlobalCSR
DS201412-0392
2014
ICMMICMMEnhancing mining's contribution to the Zambian economy and society.ICMM, April 8p.Africa, ZambiaCSR
DS201503-0150
2015
ICMMICMM, Raw Materials Group, Oxford Policy ManagementThe role of mining in national economies. 2nd editionICMM, Oct. 56p.GlobalEconomics
DS201505-0252
2015
ICMMICMMEngaging with society - ICMM releases annual review 2014.ICMM, March, 14p. PdfGlobalCSR
DS201509-0400
2015
ICMMICMMThe role of mining in Ghana's future.ICMM, July 72p.Africa, GhanaLegal
DS201512-1928
2015
ICMMICMMGood practice guide to indigenous peoples and mining.ICMM , pdf. 138p.GlobalCSR
DS201601-0020
2015
ICMMICMMUnderstanding company-community relations toolkit.ICMM, Dec. 1, 72p. PdfGlobalCSR
DS201601-0021
2015
ICMMICMMDemonstrating value: a guide to responsible sourcing for mining companies.ICMM, Dec. 3, 44p. PdfGlobalCSR
DS201601-0022
2015
ICMMICMMLand acquisition and resettlement: lessons learned.ICMM, Dec. 68p.GlobalCSR
DS201702-0216
2017
ICMMICMMICMM's water stewardship position statement.ICMM, Jan. 10, 6p.TechnologyWater management

Abstract: This position statement sets out ICMM members’ approach to water stewardship. Water stewardship is the use of water in ways that are socially equitable, environmentally sustainable, and economically beneficial.1 Effective stewardship requires collaboration and concerted action from all parties, including government, civil society, business and local communities through inclusive stakeholder engagement.
DS201902-0278
2018
ICMMICMMMining with principles.ICMM, Dec. 18p.GlobalCSR
DS200612-0618
2006
ICMM ( International Council on Mining & Metals)ICMM ( International Council on Mining & Metals)Leading by example; making a difference through partnership. ICMM annual review 2005. email for print copy ICMM, free copyGlobalMining industry - environment, social
DS1999-0322
1999
Ida, Y.Ida, Y.Effects of crustal stress on the growth of dikes: conditions of intrusion and extrusion of magma.Journal of Geophysical Research, Vol. 104, No. 8, Aug. 10, pp. 17, 897-911.GlobalMagmatism, Dikes
DS201811-2581
2013
Iddon, C.Iddon, C., Hettihewa, S., Wright, C.S.Junior mining sector capital raising: the effects of information asymmetry and uncertainty issues.Journal of Applied Business and Economics, Vol. 15, 3, 12p. PdfGlobaleconomics

Abstract: While prospecting by junior mining companies (JMCs) is a vital contributor to modern wealth creation, attributes of the junior mining sector (JMS) limit JMC-fund raisings to external equity (shares). In considering responses by JMC principals to deep discounting and other JMC-investor strategies, potential responses were found to: increase returns to principals, increase JMS moral-hazard issues, and further deepen price discounts on JMC share offerings, especially IPOs. It is suggested that the attractiveness and moral-hazard consequences of these potential responses can be greatly diminished if mining-tenement fees are raised and JMC prospecting costs are allowed as an offset against those fees.
DS201809-2071
2018
Iddon, F.Mitton, S., Iddon, F.History of deep carbon science.Goldschmidt Conference, 1p. AbstractMantlecarbon

Abstract: Deep carbon is terrestrial carbon that is not in the atmosphere or oceans or on the surface. We have a great deal of knowledge about the properties of nearsurface carbon, but relatively little is known about the deep carbon cycle. The Deep Carbon Observatory, was founded in 2009, to address major questions about deep carbon. Where are the reservoirs of carbon? Is there significant carbon flux between the deep interior and the surface? What is deep microbial life? Did deep organic chemistry have a role in the origin of life? This project is directed toward documenting and describing of the history of deep carbon science. The narrative begins in 1601, when William Gilbert suggested that Earth’s interior behaves like a giant bar magnet. We trace across three centuries the slow evolution of thought that led to the establishment of the interdisciplinary field of Earth System Science. The concept and then development of the deep carbon cycle of burial and exhumation dates back at least two hundred years. We identify and document the key discoveries of deep carbon science, and assess the impact of this new knowledge on geochemistry, geodynamics, and geobiology. A History of Deep Carbon Science is in preparation for publication by Cambridge University Press in 2019. Its illuminating narrative highlights the engaging human stories of many remarkable researchers who have discovered the complexity and dynamics of Earth’s interior.
DS2000-0543
2000
Iden, K.Kuhn, A., Glodny, J., Iden, K., Austrheim, H.Retention of Precambrian Rubidium-Strontium phlogopite ages through Caledonian eclogite facies metamorphism, Bergen ArcLithos, Vol. 51, No. 4, June pp. 305-30.Norway, WesternEclogite, metamorphism
DS201312-0423
2013
Idex MagazineIdex MagazineLabs grade differently and consumers get conned.Idex Magazine, No. 278, June 20, 2p.TechnologyLab grades
DS201312-0424
2013
Idex MagazineIdex MagazineEmpowering education: the Diamond Empowerment Fund.Idex Magazine, No. 278, June 20, 3p.AfricaDEF
DS201312-0425
2013
Idex MagazineIdex MagazineStriving to improve lives: The Diamond Development Initiative.Idex Magazine, No. 278, June 3p.GlobalDDI
DS201412-0393
2014
Idex MagazineIdex MagazineShine bright like a diamond, a homage to diamond in all its glory … facts, histories, engagement rings, power of diamond.Idex Magazine, March pp. 90-109.TechnologyHistory
DS201412-0394
2014
Idex MagazineIdex MagazineRough markets sizzles again.Idex Magazine, No. 288, April pp. 100-101.GlobalMarkets
DS201412-0395
2014
Idex MagazineIdex MagazineAre diamond industry umbrella bodies keeping members dry?Idex Magazine, No. 288, April pp. 24-25.GlobalMarkets - Networking
DS201412-0396
2014
Idex MagazineIdex MagazineIn treatment .. Gemstone enhancements.Idex Magazine, No. 294, pp. 36-38.TechnologyOverview
DS201412-0397
2014
Idex MagazineIdex MagazineTurning up the heat .. Suncrest Diamonds HPHT.Idex Magazine, No. 294, pp. 38-45.TechnologySuncrest Diamonds
DS201412-0398
2014
Idex MagazineIdex MagazineYehuda Diamond Corporation produces clarity enhanced diamonds. Process renders inclusions invisible.Idex Magazine, No. 294, pp. 46-53.TechnologyYehuda Diamond
DS201412-0399
2014
Idex MagazineIdex MagazineBotswana The new swing producer.Idex Magazine, No. 294, pp. 101-103.Africa, BotswanaIMF overview
DS201412-0400
2014
Idex MagazineIdex MagazineHow the second color moderator affects a diamond's value. Part 1.Idex Magazine, No. 294. pp. 111-112.TechnologyDiamond value
DS201501-0015
2014
Idex MagazineIdex MagazineReview of the year.Idex Magazine, No. 296, December pp. 36-66.GlobalIndustry - problems and highs and lows
DS201501-0016
2014
Idex MagazineIdex MagazineIdex & AdAmiA .. Launch of diamond investment product.Idex Magazine, No. 296, December p. 21. ( 1p)GlobalAdAmia
DS201506-0275
2015
Idex MagazineIdex MagazineThe missing gap, a bridge from gemology to reality.Idex Magazine, No. 301, pp. 118-119.TechnologyGemology
DS201512-1929
2015
Idex MagazineIdex Magazine2015 Indian diamond industry Local pressures and global challenges.Idex Magazine, No. 307, pp. 34-36.IndiaEconomics
DS201512-1930
2015
Idex MagazineIdex MagazineReturn to generalized system of preferences. IndiaIdex Magazine, No. 307, pp. 37-43.IndiaEconomics
DS201512-1931
2015
Idex MagazineIdex MagazineRough price stability will return prosperity to the Indian diamond industry.Idex Magazine, No. 307, pp. 44-46.IndiaEconomics
DS201412-0401
2014
Idex MemoIdex MemoDebunking the fallacies. Diamond industry facts.Idex Online, Feb. 13, 2p.GlobalDiamond Industry
DS201412-0402
2014
Idex MemoIdex MemoWhy retailers should care about what's happening upstream.Idex Online, July 31, 2p.GlobalInformation - decisions
DS1995-0837
1995
Idnurm, M.Idnurm, M., Giddings, J.W.Paleoproterozoic-Neoproterozoic North America-Australia link: new evidence from PaleomagnetismGeology, Vol. 23, No. 2, Feb. pp. 149-152Australia, North AmericaPaleomagnetism, Proterozoic
DS1996-0660
1996
Idnurum, M.Idnurum, M.Prolonged Rodinian link bewteen North America and AustraliaGeological Society of Australia 13th. Convention held Feb., No. 41, abstracts p.211.AustraliaPlate tectonics, Gondwanaland, Rodinia
DS1930-0140
1933
Idriess, I.L.Idriess, I.L.Industrie DiamantaireSoc. Belge De Banque., 27P.GlobalBlank
DS1940-0180
1948
Idriess, I.L.Idriess, I.L.Stone of DestinySydney And London: Angus And Robertson., 344P.GlobalKimberlite
DS1960-1132
1969
Idriess, I.L.Idriess, I.L.Stones of DestinySydney: Angus And Robertson, 2nd. Edition., 325P.AustraliaKimberley, Janlib, Diamond
DS1990-0736
1990
Idurm, M.Idurm, M.A new method of dating Australian Precambrian rocks: accumulated PolarwanderBmr Research Letter, No. 13, October 1990 pp. 6-7AustraliaGeochronology, Polar wander
DS200612-0996
2006
Iezzi, G.Oberti, R., Quartieri, S., Dalconi, M.C., Boscherini, F., Iezzi, G., Boiocchi, M., Eeckhout, S.G.Site preference and local geometry of Sc in garnets: part 1. multifarious mechanisms in the pyrope-grossular join.American Mineralogist, Vol. 91, 9, pp. 1230-1239.TechnologyMineral chemistry - garnets
DS1995-0838
1995
IG/UNICAMPIG/UNICAMPProceedings of the first international symosium on mining and developmentIg/unicamp, 300pBrazilBook -table of contents, Mining, economics
DS200912-0845
2009
IgamberdievYusupov, R.G., Stanley, C.J., Welch, M.D., Spratt, J., Cressey, G., Rusmsey, M.S., Seltmann, R., IgamberdievMavlyanovite, Mn5813: a new mineral species from a lamproite diatreme, Chatkal Ridge, Uzbekistan.Mineralogical Magazine, Vol. 73, 1, Feb. pp. 43-50.RussiaLamproite mineralogy
DS201902-0326
2019
Igami, Y.Taguchi,T., Igami, Y., Miyake, A., Masake, E.Factors affecting preservation of coesite in ultrahigh-pressure metamorphic rocks: insights from TEM observations of dislocations within kyanite Sulu China.Journal of Metamorphic Geology, https://doi.org/10.1111/jmg.12470Chinacoesite

Abstract: To understand the preservation of coesite inclusions in ultrahigh-pressure (UHP) metamorphic rocks, an integrated petrological, Raman spectroscopic and focused ion beam (FIB) system-transmission electron microscope (TEM) study was performed on a UHP kyanite eclogite from the Sulu belt in eastern China. Coesite grains have been observed only as rare inclusions in kyanite from the outer segment of garnet and in the matrix. Raman mapping analysis shows that a coesite inclusion in kyanite from the garnet rim records an anisotropic residual stress and retains a maximum residual pressure of approximately 0.35 GPa. TEM observations show quartz is absent from the coesite inclusion-host kyanite grain boundaries. Numerous dislocations and sub-grain boundaries are present in the kyanite, but dislocations are not confirmed in the coesite. In particular, dislocations concentrate in the kyanite adjacent to the boundary with the coesite inclusion, and they form a dislocation concentration zone with a dislocation density of ~109 cm-2. A high-resolution TEM image and a fast Fourier transform-filtered image reveal that a tiny dislocation in the dislocation concentration zone is composed of multiple edge dislocations. The estimated dislocation density in most of the kyanite away from the coesite inclusion-host kyanite grain boundaries is ~108 cm-2, being lower than that in kyanite adjacent to the coesite. In the case of a coesite inclusion in a matrix kyanite, using Raman and TEM analyses we could not identify any quartz at the grain boundaries. Dislocations are not observed in the coesite, but numerous dislocations and stacking faults are developed in the kyanite. The estimated overall dislocation density in the coesite-bearing matrix kyanite is ~108 cm-2, but a high dislocation density region of ~109 cm-2 is also present near the coesite inclusion-host kyanite grain boundaries. Inclusion and matrix kyanite grains with no coesite have dislocation densities of =108 cm-2. Dislocation density is generally reduced during an annealing process, but our results show that not all dislocations in the kyanite have recovered uniformly during exhumation of the UHP rocks. Hence, one of the key factors acting as a buffer to inhibit the coesite to quartz transformation is the mechanical interaction between the host and the inclusion that lead to the formation of dislocations in the kyanite. The kyanite acts an excellent pressure container that can preserve coesite during the decompression of rocks from UHP conditions. The search for and study of inclusions in kyanite may be a more suitable approach for tracing the spatial distribution of UHP metamorphic rocks.
DS201904-0786
2019
Igami, Y.Taguchi, T., Igami, Y., Miyake, A., Enami, M.Factors affecting preservation of coesite in ultrahigh-pressure metamorphic rocks: insights from TEM observations of dislocations within kyanite. Sulu UHPJournal of Metamorphic Geology, Vol. 37, 3, pp. 401-414.Chinacoesite

Abstract: To understand the preservation of coesite inclusions in ultrahigh-pressure (UHP) metamorphic rocks, an integrated petrological, Raman spectroscopic and focussed ion beam (FIB) system-transmission electron microscope (TEM) study was performed on a UHP kyanite eclogite from the Sulu belt in eastern China. Coesite grains have been observed only as rare inclusions in kyanite from the outer segment of garnet and in the matrix. Raman mapping analysis shows that a coesite inclusion in kyanite from the garnet rim records an anisotropic residual stress and retains a maximum residual pressure of ~0.35 GPa. TEM observations show quartz is absent from the coesite inclusion-host kyanite grain boundaries. Numerous dislocations and sub-grain boundaries are present in the kyanite, but dislocations are not confirmed in the coesite. In particular, dislocations concentrate in the kyanite adjacent to the boundary with the coesite inclusion, and they form a dislocation concentration zone with a dislocation density of ~109 cm-2. A high-resolution TEM image and a fast Fourier transform-filtered image reveal that a tiny dislocation in the dislocation concentration zone is composed of multiple edge dislocations. The estimated dislocation density in most of the kyanite away from the coesite inclusion-host kyanite grain boundaries is ~108 cm-2, being lower than that in kyanite adjacent to the coesite. In the case of a coesite inclusion in a matrix kyanite, using Raman and TEM analyses, we could not identify any quartz at the grain boundaries. Dislocations are not observed in the coesite, but numerous dislocations and stacking faults are developed in the kyanite. The estimated overall dislocation density in the coesite-bearing matrix kyanite is ~108 cm-2, but a high dislocation density region of ~109 cm-2 is also present near the coesite inclusion-host kyanite grain boundaries. Inclusion and matrix kyanite grains with no coesite have dislocation densities of =108 cm-2. Dislocation density is generally reduced during an annealing process, but our results show that not all dislocations in the kyanite have recovered uniformly during exhumation of the UHP rocks. Hence, one of the key factors acting as a buffer to inhibit the coesite to quartz transformation is the mechanical interaction between the host and the inclusion that lead to the formation of dislocations in the kyanite. The kyanite acts as an excellent pressure container that can preserve coesite during the decompression of rocks from UHP conditions. The search for and study of inclusions in kyanite may be a more suitable approach for tracing the spatial distribution of UHP metamorphic rocks.
DS201112-0752
2011
Igarashi, M.Ogassawara, Y., Hasiguchi, Y., Igarashi, M., Harada, Y.Microdiamonds: a relict of intermediate phase for diamond formation.Geological Society of America, Annual Meeting, Minneapolis, Oct. 9-12, abstractRussiaKokchetav massif, UHP
DS201012-0198
2010
Igel, H.Fichtner, A., Kennett, B.L.N., Igel, H., Bunge, H-P.Full waveform tomography for radially anisotropic structure: new insights into present and past states of the Australasian upper mantle.Earth and Planetary Science Letters, Vol. 290, 3-4, pp. 270-280.Australia, AsiaTomography
DS201507-0317
2015
Ignaov, P.A.Ignaov, P.A., Novikov, K.V., Shmonov, A.M., Razumov, A.N., Kilizhikov, O.K.Comparative analysis of ore bearing structures in Maiskoe, Markha and Ozernoe kimberlite bodies at the Nakyn field, Yakutia.Geology of Ore Deposits, Vol. 57, 2, pp. 111-117.RussiaDeposit - Nakyn
DS1990-0434
1990
Ignatenko, K.I.Durasova, N.A., Belyayeva, V.I., Ignatenko, K.I.Distribution and modes of occurrence of copper in boninite type magmasGeochemistry International, Vol. 27, No. 2, February pp. 127-132RussiaBoninite
DS200612-1278
2006
Ignatev, A.V.Shcheka, S.A., Ignatev, A.V., Nechaev, V.P., Zvereva, V.P.First diamonds from placers in Primorie.Petrology, Vol. 14, 3, pp. 299-Russia, South America, BrazilCarbonado, alluvials, comparison, geochronology
DS200712-0375
2007
Ignatev, A.V.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
DS200712-0974
2006
Ignatev, A.V.Shcheka, S.A., Ignatev, A.V., Nechaev, V.F., Zvereva, V.P.First diamonds from placers in Primorie.Petrology, Vol. 14, 3, pp. 299-RussiaAlluvials
DS201212-0376
2012
Ignative, A.V.Kostrovitskii, S.I., Soloveva, L.V., Gornova, M.A., Alymova, N.V., Yakolev, D.A., Ignative, A.V., Velivetskaya, T.A., Suvorova, L.F.Oxygen isotope composition in minerals of mantle parageneses from Yakutian kimberlites.Doklady Earth Sciences, Vol. 444, 1, pp. 579-584.Russia, YakutiaDeposit - Udachnaya, Komsomolskaya
DS1970-0747
1973
Ignatov, A.V.Lazarenkov, V.G., Ignatov, A.V., Loginova, T.I.Structure of the Feldspathoidal Syenitic Massif of the Area of the Los Pluton.Zap. Vses. Min. Obshch., Vol. 102, No. 1, PP. 43-53.Russia, West Africa, GuineaPetrology, Texture, Mineralogy
DS1999-0323
1999
Ignatov, P.A.Ignatov, P.A., Starostin, V.I., Shtein, Ya. I.Impact strain in sedimentary rocks hosting Diamondiferous kimberlites in Malaya Botuoba and NakynMoscow University of Geol. Bulletin., Vol. 54, No. 6, pp. 31-7.Russia, SiberiaStructure, petrology, Deposit - Malaya Botuoba, Nakyn
DS201506-0276
2015
Ignatov, P.A.Ignatov, P.A., Novikov, K.V., Shmonov, A.M., Razumov, A.N., Kilizhikov, O.K.Comparative analysis of ore-bearing structures in Maiskoe, Markha and Ozernoe kimberlite bodies at the Nakyn Field, Yakutia.Geology of Ore Deposits, Vol. 57, 2, pp. 111-117.RussiaDeposit - Nakyn
DS201809-2040
2018
Ignatov, P.A.Ignatov, P.A., Novikov, K.V., Shmonov, A.M., Zaripov, N.R., Khodnya, M.S., Razumov, A.N., Kilishekov, O.K., Kryazhev, S.G., Kovalchuk, O.E.Zoning of faults and secondary mineralization of host rocks of kimberlites of the Maiscoe diamond deposit, Nakyn field, Yakutia.Geology of Ore Deposits, Vol. 60, 3, pp. 201-209.Russiadeposit - Maiscoe
DS201511-1856
2015
IgorKryvoshlyk, IgorMathematical calculations of kimberlite diamond grade.Kryvoshlyk, 38ppt. Available ppt. Email ikryvoa481 @hotmail.comTechnologyMicrodiamonds - responses

Abstract: Diamond grade is the most important parameter of a kimberlite rock. A few hundreds of microprobe analyses of garnets picked randomly from a kimberlite concentrate might be enough to calculate mathematically accurate diamond grade.
DS201511-1857
2015
IgorKryvoshlyk, IgorKimberlite diamond grade ( actual projects and numbers)Kryvoshlyk, 18ppt. Available ppt. email ikryvoa481 @hotmail.comTechnologyMicrodiamonds - responses
DS1988-0098
1988
Igoshin, L.A.Bykova, E.V., Igoshin, L.A.Coercivity spectral parameters of magnetites from the alkaline ultrabasic rock complex, ores and carbonatites of the Karelia - Kola region.(Russian)Izv. Akad. Nauk SSSR, Fiz. Zemli., (Russian), No. 6, pp. 92-96RussiaCarbonatite
DS1991-1570
1991
Igoshina, I.I.Shnai, G.K., Sobolev, A.Y., Igoshina, I.I.Lamproites of southern Verkhoyansk region.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 319, No. 4, pp. 957-961RussiaLamproites
DS1993-1455
1993
Igoshina, I.I.Shnay, G.K., Sobolev, A.Ye., Igoshina, I.I.Verkhoyansk-region lamproites resembling Australian diamond bearinglamproites.Doklady Academy of Sciences USSR, Earth Science Section, Vol. 319A, No. 6, Publishing July 1993, pp. 166-171.RussiaLamproites
DS200512-0782
2005
Iguchi, T.Nishihara, Y., Nakayama, K., Iguchi, T., Funakoshi, K.P V T equation of state of stishovite to the mantle transition zone conditions.Physics and Chemistry of Minerals, Vol. 31, 10, pp. 660-670.MantleMineralogy
DS1995-0839
1995
Ihinger, P.D.Ihinger, P.D., Andersen, K.M.A plumlet model for the generation of New England lamprophyresGeological Society of America (GSA) Abstracts, Vol. 27, No. 1, Feb. p. 57.GlobalLamprophyres
DS1998-1362
1998
Ihinger, P.D.Smith, S.C., Ihinger, P.D.Geochemical evolution of the New England lamprophyre suite: a hotspot signature preserved in the continent..7th International Kimberlite Conference Abstract, pp. 820-22.GlobalGeochemistry, Lamprophyres
DS1999-0687
1999
Ihinger, P.D.Smith, S.C., Ihinger, P.D.Origin and evolution of mafic alkaline magmas: constraints from the mineral chemistry of New England..7th International Kimberlite Conference Nixon, Vol. 2, pp. 795-807.Quebec, New York, NEQLamprophyre suite, geochemistry, analyses, Alkaline rocks
DS2000-0438
2000
Ihinger, P.D.Jackson, M.G., Ihinger, P.D.Carbonatite expulsion from a lamprophyre: an integrated geochemical study of dike wall rock interaction.Geological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-436.GlobalCarbonatite
DS200812-0499
2008
Ihinger, P.D.Ihinger, P.D.Penetrative convection in Earth's mantle: reconciling geophysical and geochemical perspectives on mantle structure and evolution.Goldschmidt Conference 2008, Abstract p.A406.MantleConvection
DS201510-1781
2015
Ihlenfeld, C.Kyser, K., Barr, J., Ihlenfeld, C.Applied geochemistry in mineral exploration and mining.Elements, Vol. 11, Aug. pp. 241-246.TechnologyNot specific to diamonds

Abstract: The prosperity of our societies and our standards of living are directly related to our ability to find, exploit, and manage our metal and mineral resources. Metal and mineral deposits are, in fact, geochemical anomalies and, as such, applied geochemistry plays a critical role throughout the mineral resources value chain, from early stage exploration to mine closure. The fundamentals of element mobility (i.e. transport and fixation) in the near-surface environment are used by geochemists to detect mineral deposits at depth, reveal element distributions in and around deposits, assess the total geochemical environment, and refine effective and benign extraction and waste disposal techniques. Both pure- and applied-research ventures play fundamental roles in providing the techniques to manage metal resources and thereby benefit society.
DS1859-0080
1845
I'InstitutI'InstitutDiamonds in Mexico, 1845L'institut., Vol. 13, P. 68.MexicoDiamond Ioccurrence
DS1992-1372
1992
IIshi, K.Shannon, R.D., IIshi, K., Allik, T.H., et al.Dielectric constants of BaO and melilites and the oxide additive ruleEuropean Journal of Mineralogy, Vol. 4, pp. 1241-1249.GlobalMelilites, Mineralogy
DS201212-0817
2012
Iizuka, C.H-O.Zhang, R.Y.,Liou, J.G., Omori, S., Sobolev, N.V., Shatsky, V.S., Iizuka, C.H-O.Tale of the Kulet eclogite from the Koketchev Massive, Kazakhstan: initial tectonic setting and transition from amphibolite to eclogite.Journal of Metamorphic Geology, in press availableRussia, KazakhstanEclogite
DS200412-1471
2004
Iizuka, T.Ono, S., Kikegawa, T., Iizuka, T.The equation of state of orthorhombic perovskite in a peridotitic mantle composition to 80 GPa: implications for chemical composPhysics of the Earth and Planetary Interiors, Vol. 145, 1-4, pp. 9-17.MantlePeridotite
DS201212-0105
2012
Iizuka, T.Campbell, I., Gill, J., Iizuka, T., Allen, C.What detrital zircons tell us about growth of the continental crust.Goldschmidt Conference 2012, abstract 1p.MantleGeochronology
DS201703-0407
2017
Iizuka, T.Iizuka, T., Yamaguchi, T., Itano, K., Hibiya, Y., Suzuki, K.What Hf isotopes in zircon tell us about crust mantle evolution.Lithos, Vol. 274-275, pp. 304-327.MantleGeochronology

Abstract: The 176Lu-176Hf radioactive decay system has been widely used to study planetary crust-mantle differentiation. Of considerable utility in this regard is zircon, a resistant mineral that can be precisely dated by the U-Pb chronometer and record its initial Hf isotope composition due to having low Lu/Hf. Here we review zircon U-Pb age and Hf isotopic data mainly obtained over the last two decades and discuss their contributions to our current understanding of crust-mantle evolution, with emphasis on the Lu-Hf isotope composition of the bulk silicate Earth (BSE), early differentiation of the silicate Earth, and the evolution of the continental crust over geologic history. Meteorite zircon encapsulates the most primitive Hf isotope composition of our solar system, which was used to identify chondritic meteorites best representative of the BSE (176Hf/177Hf = 0.282793 ± 0.000011; 176Lu/177Hf = 0.0338 ± 0.0001). Hadean-Eoarchean detrital zircons yield highly unradiogenic Hf isotope compositions relative to the BSE, providing evidence for the development of a geochemically enriched silicate reservoir as early as 4.5 Ga. By combining the Hf and O isotope systematics, we propose that the early enriched silicate reservoir has resided at depth within the Earth rather than near the surface and may represent a fractionated residuum of a magma ocean underlying the proto-crust, like urKREEP beneath the anorthositic crust on the Moon. Detrital zircons from world major rivers potentially provide the most robust Hf isotope record of the preserved granitoid crust on a continental scale, whereas mafic rocks with various emplacement ages offer an opportunity to trace the Hf isotope evolution of juvenile continental crust (from eHf[4.5 Ga] = 0 to eHf[present] = + 13). The river zircon data as compared to the juvenile crust composition highlight that the supercontinent cycle has controlled the evolution of the continental crust by regulating the rates of crustal generation and intra-crustal reworking processes and the preservation potential of granitoid crust. We use the data to explore the timing of generation of the preserved continental crust. Taking into account the crustal residence times of continental crust recycled back into the mantle, we further propose a model of net continental growth that stable continental crust was firstly established in the Paleo- and Mesoarchean and significantly grew in the Paleoproterozoic.
DS201904-0752
2019
Iizuka, T.Kobayashi, M., Sumino, H., Burgess, R., Nakai, S., Iizuka, T., Nagao, J. Kagi, H., Nakamura, M., Takahashi, E., Kogiso, T., Ballentine, C.J.Halogen heterogeneity in the lithosphere and evolution of mantle halogen abundances inferred from intraplate mantle xenoliths. Kilbourne HoleGeochemistry, Geophysics, Geosystems, Vol. 20, 2, pp. 952-973.United States, New Mexicoxenoliths

Abstract: Elemental and isotopic compositions of volatile species such as halogens, noble gases, hydrogen, and carbon can be used to trace the evolution of these species in the Earth. Halogens are important tracers of subduction recycling of surface volatiles into the mantle: however, there is only limited understanding of halogens in the mantle. Here we provide new halogen data of mantle xenoliths from intraplate settings. The mantle xenoliths show a wide range of halogen elemental ratios, which are expected to be related to later processes after the xenoliths formed. A similar primary halogen component is present in the xenoliths sampled from different localities. This suggests that the mantle has the uniform halogen composition over a wide scale. The halogen composition in the convecting mantle is expected to have remained constant over more than 2 billion years, despite subduction of iodine-rich halogens. We used mass balance calculations to gain understanding into evolution rate of I/Cl ratio in the mantle. Calculations suggest that, in order to maintain the I/Cl ratio of the mantle over 2 Gyr, the I/Cl ratio of the subducted halogens must be no more than several times higher than the present-day mantle value.
DS200412-2163
2004
Iizuka, Y.Xu, Y.G., Huang, X.L., Wang, Y.B., Iizuka, Y., Xu, J.F., Wang, Q., Wu, X.Y.Crust mantle interaction during the tectono-thermal reactivation of the North Chin a Craton: constraints from SHRIMP zircon U PbContributions to Mineralogy and Petrology, Vol. 147, 6, pp. 750-767.China, ShandongGeothermometry, geochronology
DS201512-1984
2015
Iizuka, Y.Wang, K-L., Prikhodo, V., O'Reilly, S.Y., Griffin, W.L., Pearson, N.J., Kovach, V., Iizuka, Y., Chien, Y-H.Ancient mantle lithosphere beneath the Khanka massif in the Russian Far East: in situ Re-Os evidence.Terra Nova, Vol. 27, 4, pp. 277-284.RussiaGeochronology

Abstract: The Os-isotope compositions of sulphides in mantle xenoliths hosted by Late Miocene alkali basalts from the Sviyaginsky volcano, Russian Far East, reveal the presence of Archaean-Proterozoic subcontinental lithospheric mantle beneath the Khanka massif. Their TMA and TRD model ages reveal similar peaks at 1.1 and 0.8 Ga suggesting later thermotectonic events in the subcontinental lithospheric mantle, whereas TRD model ages range back to 2.8 ± 0.5 (2s) Ga. The events recognized in the subcontinental lithospheric mantle are consistent with those recorded in the crust of the Khanka massif. The sulphide Os-isotope data show that the subcontinental lithospheric mantle beneath the Khanka massif had formed at least by the Mesoproterozoic, and was subsequently metasomatized by juvenile crustal-growth events related to the evolution of the Altaids. The Khanka massif is further proposed to have tectonic affinity to the Siberia Craton and should originate from it accordingly.
DS200612-0446
2005
Iizumi, Sh.Gerel, O., Munkhtsengel, B., Enkhtuvshin, H., Iizumi, Sh.Mushgai Khudag and Bayan Khosuu volcanic plutonic alkaline complexes with REE Ta Nb Fe carbonatite mineralization.Seltmann, Gerel, Kirwin eds. Geodynamics and Metallogeny of Mongolia with emphasis on copper, gold, pp. 215-225.Asia, MongoliaCarbonatite, rare earths
DS1986-0378
1986
Ijewlin, O.J.Ijewlin, O.J.Comparative mineralogy of three ultramafic breccia diatremes in southeastern British Columbia, Cross, Blackfoot and HP #1Bsc. Thesis, University Of British Columbia, 61p. 28 refsBritish ColumbiaKimberlitic diatreme, Petrology, Metasomatism
DS1987-0307
1987
Ijewlin, O.J.Ijewlin, O.J.Comparative mineralogy of three ultramafic breccia diatremes in southeastern British Columbia, Cross, Blackfoot and HP #2British Columbia Geol. Fieldwork 1986, Paper No. 1987-1, pp. 273-282, No. 1987-1, pp. 273-282British ColumbiaCarbonatite, Diatreme
DS1989-0673
1989
Ijewlin, O.J.Ijewlin, O.J.Comparative mineralogy of three ultramafic breccia diatremes in southeastern British Columbia- Cross, Blackfoot and HP #3Ph.d. thesis, Queen's University in progress, British ColumbiaRef -Notation only, Cross
DS2003-0558
2003
Ijewliw, O.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's high arctic: application of hyper spectral Data31st Yellowknife Geoscience Forum, p. 37. (abst.Nunavut, Baffin IslandRemote sensing - hyperspectral
DS2003-1058
2003
Ijewliw, O.Pell, J., Ijewliw, O.Kimberlites, melnoites and Look alikes in British Columbia CanadaBritish Columbia Geological Survey, large posterBritish ColumbiaOverview
DS200412-0796
2003
Ijewliw, O.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's high arctic: application of hyper spectral Data.31st Yellowknife Geoscience Forum, p. 37. (abst.Canada, Nunavut, Baffin IslandRemote sensing - hyperspectral
DS200412-1518
2003
Ijewliw, O.Pell, J., Ijewliw, O.Kimberlites, melnoites and Look alikes in British Columbia Canada.British Columbia Geological Survey, large posterCanada, British ColumbiaOverview
DS200612-0537
2005
Ijewliw, O.Harris, J.R., Rogge, D., Hitchcock, R., Ijewliw, O., Wright, D.Mapping lithology in Canada's Arctic: application of hyper spectral dat a using the minimum noise fraction transformation and matched filtering.Canadian Journal of Earth Sciences, Vol. 41, 12, Dec. pp. 2173-2193.Canada, Nunavut, Baffin IslandMapping - hyperspectral, lithology
DS200712-1031
2007
Ijewliw, O.St.Onge, M.R., Wodicka, N., Ijewliw, O.Polymetamorphic evolution of the Trans-Hudson Orogen, Baffin Island, Canada: integration of petrological, structural and geochronological data.Journal of Petrology, Vol. 48, 2, Feb., pp. 271-302.Canada, Nunavut, Baffin IslandTectonics
DS1988-0317
1988
Ijewliw, O.J.Ijewliw, O.J., Schulze, D.J.The HP pipe, a preliminary report. 82 N 10British Columbia Department of Mines, Geological Fieldwork 1987, Paper 1988-1, pp. 369-374British ColumbiaBlank
DS1989-0674
1989
Ijewliw, O.J.Ijewliw, O.J.Mineral chemistry of eastern British Columbia lamprophyresGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A49. (abstract.)British ColumbiaLamprophyres, Mineral chemistry
DS1989-0675
1989
Ijewliw, O.J.Ijewliw, O.J., Schulze, D.J.The Golden cluster of diatremes and dykes. Golden 82NPreprint from British Columbia Report of Field Work, 1989, pp. B39-B46British ColumbiaCarbonatite, Golden Diatremes
DS1990-0737
1990
Ijewliw, O.J.Ijewliw, O.J.Spinel chemistry as an indicator of magmatic processes in lamprophyres of Eastern British ColumbiaGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Vancouver 90 Program with Abstracts, Held May 16-18, Vol. 15, p. A63. AbstractBritish ColumbiaLamprophyres, Geochemistry
DS1992-0749
1992
Ijewliw, O.J.Ijewliw, O.J.Petrology of the Golden cluster lamprophyres in southeastern BritishColumbiaBritish Columbia Geological Survey, Paper 1992-1, pp. 37-45British ColumbiaHP, MOns Creek, Golden, Petrology
DS1995-0840
1995
Ijewliw, O.J.Ijewliw, O.J., Pell, J.A.The petrology of pre-orogenic alkaline and ultramafic lamprophyre diatremesin the Cordillera near Golden.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 245-247.British ColumbiaDiatremes, Bush River, Mons Creek, Valenciennes, Lens, Campbell
DS1996-0661
1996
Ijewliw, O.J.Ijewliw, O.J., Pell, J.Diatreme breccias in the CordilleraGeological Survey of Canada, LeCheminant ed, OF 3228, pp. 91-95.British Columbia, Northwest TerritoriesDiatreme breccias, Lithology
DS2003-1059
2003
Ijewliw, O.J.Pell, J.A., Ijewliw, O.J.Kimberlites, melnoites and look alikes in British Columbia, Canada8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, POSTER abstractBritish ColumbiaBlank
DS200412-1519
2003
Ijewliw, O.J.Pell, J.A., Ijewliw, O.J.Kimberlites, melnoites and look alikes in British Columbia, Canada.8 IKC Program, Session 8, POSTER abstractCanada, British ColumbiaDiamond exploration
DS1990-0738
1990
Ikeda, Y.Ikeda, Y.Cen/Srn/Smn: a trace element discriminant for basaltic rocks from different Tectonomagmatic environmentsNeues Jahrbuch fnr Mineralogie Mhn, No. 4, pp. 145-158GlobalGeochemistry, Basalts
DS1990-0739
1990
Ikeda, Y.Ikeda, Y.Cen/Srn/SMn/: a trace element discriminant for basaltic rocks from different Tectonomagmatic environmentsNeues Jharb. Min. Mh, No. 4, pp. 145-158Oceanic ridgeBack arc basin, Geochemistry
DS201312-0511
2013
Ikeene, M.Kouyate, D., Soderlund, U., Youbi, N., Ernst, R., Hafid, A., Ikeene, M., Soulaimani, A., Betrand, H., El Janati, M., Rkha, C.U Pb baddeleyite and zircon ages of 2040 Ma, 1650 Ma and 885 Ma on dolerites in the West African Craton ( Anti-Atlas inliers) : possible links to break up of Precambrian supercontinents.Lithos, Vol. 174, pp. 71-84.AfricaGeochronology
DS201312-0241
2013
Ikenne, M.El Bahat, A., Ikenne, M., Soderlund, U., Cousens, B., Youbi, N., Ernst, R., Soulaimani, A., El Janati, M., Hafid, A.U PB baddeleyite ages and geochemistry of dolerite dykes in the Bas Draa In lier of the Anti-Atlas of Morocco: newly identified Ma event in the West African craton.Lithos, Vol. 174, pp. 85-98.Africa, MoroccoGeochronology
DS201312-0999
2013
Ikenne, M.Youbi, N., Kouyate, D., Soderlund, U., Ernst, R.E., Soulaimani, A., Hafid, A., Ikenne, M., El Bahat, A., Betrand, H., Chaham, K.R., Ben Abbou, M., Mortaji, A., El Ghorfi, M., Zouhair, M., El Janati, M.The 1750 Ma magmatic event of the West African Craton ( Anti-Atlas) Morocco.Precambrian Research, Vol. 236, pp. 106-123.Africa, MoroccoDike swarms
DS201703-0408
2017
Ikenne, M.Ikenne, M., Souhassou, M., Arai, S., Soulaimani, A.A historical overview of Moroccan magmatic events along the northwest edge of the West African craton.Journal of African Earth Sciences, Vol. 127, pp. 3-15.Africa, MoroccoCraton - magmatism

Abstract: Located along the northwestern edge of the West African Craton, Morocco exhibits a wide variety of magmatic events from Archean to Quaternary. The oldest magmatic rocks belong to the Archean Reguibat Shield outcrops in the Moroccan Sahara. Paleoproterozoic magmatism, known as the Anti-Atlas granitoids, is related to the Eburnean orogeny and initial cratonization of the WAC. Mesoproterozoic magmatism is represented by a small number of mafic dykes known henceforth as the Taghdout mafic volcanism. Massive Neoproterozoic magmatic activity, related to the Pan-African cycle, consists of rift-related Tonian magmatism associated with the Rodinia breakup, an Early Cryogenian convergent margin event (760-700 Ma), syn-collisional Bou-Azzer magmatism (680-640 Ma), followed by widespread Ediacaran magmatism (620-555 Ma). Each magmatic episode corresponded to a different geodynamic environment and produced different types of magma. Phanerozoic magmatism began with Early Cambrian basaltic (rift?) volcanism, which persisted during the Middle Cambrian, and into the Early Ordovician. This was succeeded by massive Late Devonian and Carboniferous, pre-Variscan tholeiitic and calc-alkaline (Central Morocco) volcanic flows in basins of the Moroccan Meseta. North of the Atlas Paleozoic Transform Zone, the Late Carboniferous Variscan event was accompanied by the emplacement of 330-300 Ma calc-alkaline granitoids in upper crustal shear zones. Post-Variscan alkaline magmatism was associated with the opening of the Permian basins. Mesozoic magmatism began with the huge volumes of magma emplaced around 200 Ma in the Central Atlantic Magmatic Province (CAMP) which was associated with the fragmentation of Pangea and the subsequent rifting of Central Atlantic. CAMP volcanism occurs in all structural domains of Morocco, from the Anti-Atlas to the External Rif domain with a peak activity around 199 Ma. A second Mesozoic magmatic event is represented by mafic lava flows and gabbroic intrusions in the Internal Maghrebian flysch nappes as well as in the external Mesorif. This event consists of Middle-Upper Jurassic MORB tholeiites emplaced during opening of the Alpine Tethys ocean. The Central High Atlas also records Early Cretaceous alpine Tethys magmatism associated with the aborted Atlas rift, or perhaps linked to plume activity on the edge of the WAC. Cenozoic magmatism is associated with Tertiary and Quaternary circum-Mediterranean alkaline provinces, and is characterized by an intermittent activity over 50 Ma from the Anti-Atlas to the Rif Mountain along a SW-NE volcanic lineament which underlines a thinned continental lithosphere.
DS201805-0952
2017
Ikenne, M.Ikenne, M., Lahna, A.A., Soderlund, U., Tassinar, C.C.G., Ernst, R.E., Pin, Ch., Youbi, N., El Aouli, EH., Hafid, A., Admou, H., Mata, J., Bouougri, EH., Boumehdi, M.A.New Mesoproterozoic age constraints for the Taghdout Group, Anti-Atlas ( Morocco): toward a new lithostratigra[hic framework for the Precambrian in the NW margin of the West African Craton.The First West African Craton and Margins International Workshop WACMA, Held Apr. 24-29. 1p. AbstractAfrica, Moroccogeochronology
DS201212-0375
2012
Ikibas, C.Kose, C., Alp, I., Ikibas, C.Statistical methods for segregation and quantification of minerals in ore microscopy.Minerals Engineering, Vol. 30, April pp. 19-32.TechnologyMicrographic image analysis -not specific to diamonds
DS1991-0762
1991
Ikorskiy, S.V.Ikorskiy, S.V.Hydrocarbon gases in alkali intrusionsGeochemistry International, Vol. 28, No. 7, pp. 17-23RussiaAlkaline rocks, Geochemistry
DS2001-0838
2001
Ikorsky, S.V.Nivin, V.A., Ikorsky, S.V., Kamensky, I L.Noble gas (lle Ar) isotope evidence for sources of Devonian alkaline magmatism and ore formation related..Alkaline Magmatism -problems mantle source, pp. 177-88.Russia, Kola PeninsulaGeochronology, Argon
DS2002-1147
2002
Ikorsky, S.V.Nivin, V.A., Ikorsky, S.V., Balaganskaya, E.G., Liferovich, R.P., Subbotin, V.V.Helium and argon isotopes in minerals of ore deposits associated with the Kovdor and18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.250.Russia, Kola Peninsulacarbonatite - mineralogy
DS200512-0783
2002
Ikorsky, S.V.Nitvin, V.A., Ikorsky, S.V.Some genetic features of the Lovozero rare metal deposits (NW Russia) as it follows from noble gas (He Ar) isotope abundances.Deep Seated Magmatism, magmatism sources and the problem of plumes., pp. 230-252.RussiaGeochronology - Lovozero
DS200512-0786
2001
Ikorsky, S.V.Nivin, V.A., Ikorsky, S.V., Kamensky, I.L.Noble gas ( He Ar) isotope evidence for sources of Devonian alkaline magmatism and ore formation related within the Kola province, NW Russia).Alkaline Magmatism and the problems of mantle sources, pp. 177-188.Russia, Kola PeninsulaGeochronology
DS200512-0787
2003
Ikorsky, S.V.Nivin, V.A., Liferovich, R.P., Ikorsky, S.V., Balaganskaya, E.G., Subbotin, V.V.Noble gas isotopes in minerals from phoscorites and carbonatites in Kovdor and Seblyavr ultramafic alkaline complexes ( Kola alkaline province NW Russia).Periodico di Mineralogia, (in english), Vol. LXX11, 1. April, pp. 135-146.Russia, Kola PeninsulaGeochronology
DS200512-0788
2005
Ikorsky, S.V.Nivin, V.A., Treloar, P.J., Konopleva, N.G., Ikorsky, S.V.A review of the occurrence, form and origin of C bearing species in the Khibiny alkaline igneous complex, Kola Peninsula, NW Russia.Lithos, Advanced in press,Russia, Kola PeninsulaAbiogenic, hydrocarbons
DS200612-0139
2005
Ikorsky, S.V.Bivin, V.A., Treloar, P.J., Konoleva, N.G., Ikorsky, S.V.A review of the occurrence, form and origin of C bearing species in the Khibiny alkaline igneous complex, Kola Peninsula, NW Russia.Lithos, Vol. 85, 1-4, Nov-Dec. pp. 93-112.Russia, Kola PeninsulaCarbonatite
DS200712-0461
2007
Ikorsky, S.V.Ikorsky, S.V., Avedisyan, A.A.Hydrocarbon gases and helium isotopes in the Paleozoic alkaline ultramafic massifs of the Kola Peninsula.Geochemistry International, Vol. 45, 1, pp. 62-69.Russia, Kola PeninsulaGeochronology
DS200912-0839
2009
Ikorsky, V.A.N.A.Yelisseyev, A.A.P.A., Afanasiev, V.A.P.A., Ikorsky, V.A.N.A.Magnetic susceptibility of natural diamonds.Doklady Earth Sciences, Vol. 425, 2, pp. 330-333.TechnologyDiamond morphology
DS1984-0765
1984
Ikramuddin, M.Werle, J.L., Ikramuddin, M., Mutschler, F.E.Allard stock, la Plat a Mountains, Colorado- an alkaline rock hostedporphyry copper -precious metal depositCanadian Journal of Earth Sciences, Vol. 21, pp. 630-641ColoradoCarbonatite, Alkaline Rocks
DS202006-0917
2020
Ilankoon, I.M.S.K.Dushyantha, N., Batapola, N., Ilankoon, I.M.S.K., Rohitha, S., Premasiri, R., Abeysinghe, B., Ratnayake, N., Dissanayake, K.The story of rare earth elements ( REES): occurrences, global distribution, genesis, geology, mineralogy and global production.Ore Geology Reviews, Vol. 122, 17p. PdfGlobalREE

Abstract: Rare earth elements (REEs) including fifteen lanthanides, yttrium and scandium are found in more than 250 minerals, worldwide. REEs are used in various high-tech applications across various industries, such as electrical and electronics, automotive, renewable energy, medical and defence. Therefore, the demand for REEs in the global market is increasing day by day due to the surging demand from various sectors, such as emerging economies, green technology and R&D sectors. Rare earth (RE) deposits are classified on the basis of their genetic associations, mineralogy and form of occurrences. The Bayan Obo, Mountain Pass, Mount Weld and China’s ion adsorption clays are the major RE deposits/mines in the world to date and their genesis, chronology and mineralogy are discussed in this review. In addition, there are other RE deposits, which are currently being mined or in the feasibility or exploration stages. Most of the RE resources, production, processing and supply are concentrated in the Asia-Pacific region. In this regard, China holds the dominancy in the RE industry by producing more than 90% of the current rare earth requirements. Thus, REEs are used as a powerful tool by China in trade wars against other countries, especially against USA in 2019. However, overwhelming challenges in conventional RE explorations and mining make secondary RE resources, such as electric and electronic waste (e-waste) and mine tailings as promising resources in the future. Due to the supply risk of REEs and the monopoly of the REEs market, REEs recycling is currently considered as an effective method to alleviate market fluctuations. However, economical and sustainable processing techniques are yet to be established to exploit REEs via recycling. Moreover, there are growing ecological concerns along with social resistance towards the RE industry. To overcome these issues, the RE industry needs to be assessed to maintain long-term social sustainability by fostering the United Nations sustainable development goals (SDGs).
DS200612-1415
2006
Ilchenko, K.O.Taran, M.N., Kvasnytsya, V.M., Langer, K., Ilchenko, K.O.Infrared spectroscopy study of nitrogen centers in microdiamonds from Ukrainian Neogene placers.European Journal of Mineralogy, Vol. 18, 1, pp. 71-81.Europe, Ukraine, RussiaMicrodiamonds
DS1993-0710
1993
Ildefonse, B.Ildefonse, B., Nicolas, A., Boudier, F.Evidence from the Oman ophiolite for sudden stress changes during melt injection at oceanic spreading centresNature, Vol. 366, December 16, pp. 673-674OmanOphiolite, Magma
DS1994-1276
1994
Ildefonse, B.Nicolas, A., Boudier, F/., Ildefonse, B.Evidence from the Oman ophiolite for active mantle upwelling beneath a fast spreading ridgeNature, Vol. 370, No. 6484, July 7, pp.51-53OmanOphiolite, Plumes
DS201709-2065
2017
Ildefonse, B.Tomlinson, E.L., Kamber, B.C., Hoare, C.V., Stead, C.V., Ildefonse, B.An exsolution origin for Archaean mantle garnet.Goldschmidt Conference, abstract 1p.Mantlegarnet

Abstract: It is now well established that the cratonic sub-continental lithospheric mantle (SCLM) represents a residue of extensively melted fertile peridotite. The widespread occurrence of garnet in the Archaean SCLM remains a paradox because many experiments agree that garnet is exhausted beyond c. 20% melting. It has been suggested that garnet may have formed by exsolution from Al-rich orthopyroxene [1,2,3]. However, the few examples of putative garnet exsolution in cratonic samples remain exotic and have not afforded a link to garnet that occurs as distinct grains in granular harzburgite. We present crystallographic (EBSD), petrographic and chemical (SEM-EDS and LA-ICP-MS) data for an exceptionally well-preserved orthopyroxene megacryst juxtaposed against granular harzburgite. Garnet lamellae within the megacryst show crystallographic continuity and have a strong fabric relative to the host orthopyroxene, strongly indicating that the megacryst formed by exsolution. Garnet lamellae are sub-calcic Cr-pyropes with sinusoidal rare earth element patterns, while the orthopyroxene host is high-Mg enstatite; the reconstructed precursor is clinoestatite. The megacryst shows evidence for disintegrating into granular peridotite, and garnet and orthopyroxene within the granular peridotite are texturally and chemically identical to equivalent phases in the megacryst. Collectively, this evidence supports a common origin for the granular and exsolved portions of the sample. The compositions of the exsolved Cr pyrope and enstatite are typical of harzburgites and depleted lherzolites from the SCLM. Furthermore, garnet inclusions within orthopyroxene in several granular peridotites exhibit the same fabric as those in the exsolved megacryst. We hypothesise that clinoenstatite was a common phase in cratonic SCLM and that exsolution is the likely origin of many sub-calcic garnets in depleted peridotites.
DS201805-0983
2018
Ildefonse, B.Tomlinson, E.L., Kamber, B.S., Hoare, B.C., Stead, C.V., Ildefonse, B.An exsolution origin for Archean mantle garnet. C-SCLM KaapvaalGeology, Vol. 46, 2, pp. 123-126.Africa, South Africacraton

Abstract: It is well established that the cratonic subcontinental lithospheric mantle (C-SCLM) represents a residue of extensively melted peridotite. The widespread occurrence of garnet in C-SCLM remains a paradox because experiments show that it should be exhausted beyond ~20% melting. It has been suggested that garnet may have formed by exsolution from Al-rich orthopyroxene; however, the few documented examples of garnet exsolution in cratonic samples are exotic and do not afford a direct link to garnet in granular harzburgite. We report crystallographic, petrographic, and chemical data for an exceptionally well preserved orthopyroxene megacryst containing garnet lamellae, juxtaposed against granular harzburgite. Garnet lamellae are homogeneously distributed within the host orthopyroxene and occur at an orientation that is unrelated to orthopyroxene cleavage, strongly indicating that they formed by exsolution. Garnet lamellae are subcalcic Cr-pyrope, and the orthopyroxene host is high-Mg enstatite; these phases equilibrated at 4.4 GPa and 975 °C. The reconstructed precursor is a high-Al enstatite that formed at higher pressure and temperature conditions of ~6 GPa and 1750 °C. The megacryst shows evidence for disintegrating into granular peridotite, and garnet and orthopyroxene within the granular peridotite are texturally and chemically identical to equivalent phases in the megacryst. Collectively, this evidence supports a common origin for the granular and exsolved portions of the sample. We hypothesize that high-Al enstatite was a common phase in the C-SCLM and that exsolution during cooling and stabilization of the C-SCLM could be the origin of most subcalcic garnets in depleted peridotites.
DS1994-1887
1994
Iliffe, J.E.Watkins, A.P., Iliffe, J.E., Sharp, W.E.The effects of extensional and transpressional tectonics upon the development of Birimian sed. faciesJournal of African Earth Sciences, Vol. 17, No. 4, pp. 457-478Ghana, West AfricaTectonics, Bomfa Beposo District
DS1991-0763
1991
Ilin, A.V.Ilin, A.V.The Proterozoic supercontinent: its Precambrian rifting and breakup into anumber of continentsInternational Geology Review, Vol. 33, No. 1, pp. 1-14GlobalCraton, Tectonics
DS1970-0998
1974
Ilin, N.P.Turgarinov, A.L., Ilin, N.P., Mokhanti, R.Distribution of Magnesium and Mn in Coexisting Titanomagnetites And Ilmenites and Their Significance As a Geothermometer.Geochemistry International (Geokhimiya), No. 7, RussiaKimberlite
DS200712-0307
2007
Iljich, R.A.Fedorovich, A.N., Yurevich, S.M., Iljich,R.A.Prediction of and searching for kimberlites by multispectral satellite images (MSI) on the basis of the stability theory of frames and encoding images.IAGOD Meeting held August 2006, Abstract, 5p.TechnologyRemote sensing - hyperspectral
DS1997-0804
1997
Iljina, M.Mitrofanov, F., Torokhov, M., Iljina, M.Ore deposits of the Kola Peninsula, northwestern RussiaFinland Geological Survey Guidebook, No. 45, 46pRussia, Kola PeninsulaMetallogeny, Kola Peninsula
DS1998-0374
1998
Illiffe, J.E.Duppenbecker, S.J., Illiffe, J.E.The application of basin modelling techniquesGeological Society of London Spec. Pub, No. 141, 256p. $ 125.00EuropeBook - ad, Basins - models
DS200812-0500
2008
Illona Romu, K.R.Illona Romu, K.R., Luttinen, A.V., O'Brien, H.E.Lamproite orangeite transition in 159 Ma dykes of Dronning Maud Land, Antarctica.9IKC.com, 3p. extended abstractAntarcticaLamproite
DS201905-1056
2019
Illsley-Kemp, F.Lavayssiere, A., Drooff, C., Ebinger, C., Gallacher, R., Illsley-Kemp, F., Finnigan, Oliva, S.J., Keir, D.Deep extent and kinematics of faulting in the southern Tanganyika Rift, Africa.Tectonics, Vol. 38, 3, pp. 842-862.Africarifting

Abstract: Unusually deep earthquakes occur beneath rift segments with and without surface expressions of magmatism in the East African Rift system. The Tanganyika rift is part of the Western rift and has no surface evidence of magmatism. The TANG14 array was deployed in the southern Tanganyika rift, where earthquakes of magnitude up to 7.4 have occurred, to probe crust and upper mantle structure and evaluate fault kinematics. Four hundred seventy-four earthquakes detected between June 2014 and September 2015 are located using a new regional velocity model. The precise locations, magnitudes, and source mechanisms of local and teleseismic earthquakes are used to determine seismogenic layer thickness, delineate active faults, evaluate regional extension direction, and evaluate kinematics of border faults. The active faults span more than 350 km with deep normal faults transecting the thick Bangweulu craton, indicating a wide plate boundary zone. The seismogenic layer thickness is 42 km, spanning the entire crust beneath the rift basins and their uplifted flanks. Earthquakes in the upper mantle are also detected. Deep earthquakes with steep nodal planes occur along subsurface projections of Tanganyika and Rukwa border faults, indicating that large offset (=5 km) faults penetrate to the base of the crust, and are the current locus of strain. The focal mechanisms, continuous depth distribution, and correlation with mapped structures indicate that steep, deep border faults maintain a half-graben morphology over at least 12 Myr of basin evolution. Fault scaling based on our results suggests that M > 7 earthquakes along Tanganyika border faults are possible.
DS1998-1215
1998
IllupinRass, I.T., Gerasimov, Laputina, IllupinDiamond occurrence in kimberlites dependent on melting depths and rates of cooling of parental mantle magmas.7th. Kimberlite Conference abstract, pp. 723-4.South Africa, Siberia, RussiaMagmatism, Deposit - Wesselton, Mir
DS1950-0394
1958
Illustrated London NewsIllustrated London NewsA Large Russian Diamond Find: Gems from the Yakutia FieldsIllustrated London News, Feb. 1, P. 191 ( PHOTOGRAPHS).RussiaDiamonds Notable
DS200712-0296
2006
Ilondo, B.O.Eriksson, P.G., Mazumder, R., Catuneanu, O., Bumby, A.J., Ilondo, B.O.Precambrian continental free board and geological evolution: a time perspective. Kaapvaal, Pilbara, SinghbhumEarth Science Reviews, in press availableMantle, South Africa, Australia, IndiaContinent freeboard, crustal growth, thickness, plumes
DS1987-0583
1987
IlupinPodgayetskiy, 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
DS200512-0100
2004
IlupinBogatikov, O.A., Kononova, V.A., Golubeva, Zinchuk, Ilupin, Rotman, Levsky, Ovchinnikova, KondrashovVariations in chemical and isotopic compositions of the Yakutian kimberlites and their causes.Geochemistry International, Vol. 42, 9, pp. 799-821.Russia, Siberia, YakutiaGeochemistry
DS200712-0147
2006
Ilupin, I.Carlson, R.W., Czamanske, G., Fedorenko, V., Ilupin, I.A comparison of Siberian meimichites and kimberlites: implications for the source of high Mg alkalic flood basalts.Geochemistry, Geophysics, Geosystems: G3, Vol. 7, Q11014 Nov. 21RussiaDeposit - Meymecha-Kotuy - geochemistry
DS1960-0155
1961
Ilupin, I.P.Ilupin, I.P.Features of the Mineralogical Composition of the Kimberlites from the Various Diamond Bearing Regions of Western Yakutia.In: Conference On The Geology Deposits of Western Yakutia., RussiaBlank
DS1960-0156
1961
Ilupin, I.P.Ilupin, I.P., Kozlov, I.T., Pankratov, A.A.The Problem of the Origin of Trace Minerals in Diamond in The Kimberlites of Yakutia.Zap. Vses. Miner. Obshch., PT. 90, No. 4, PP. 488-492.RussiaBlank
DS1960-0253
1962
Ilupin, I.P.Ilupin, I.P.Distribution of Some Hydrothermal and Supergene Minerals In the Kimberlites of Yakutia.Sovetsk. Geol., No. 3, PP. L52-L56.RussiaBlank
DS1960-0355
1963
Ilupin, I.P.Ilupin, I.P.The Problem of the Association between the Chemical and Mineralogical Composition of the Kimberlites.Transactions MOSCOW GEOL. RAZV. Institute, Vol. 39, PP. 73-76.RussiaBlank
DS1960-0356
1963
Ilupin, I.P.Ilupin, I.P., Lebedev, A.A.Subvolcanic Kimberlite Facies and the Formation of the Kelyphite Rim in Garnets.Sovetsk. Geol., No. L.RussiaBlank
DS1960-0396
1963
Ilupin, I.P.Savrasov, D.I., Ilupin, I.P.The Use of Magnetic Prospecting Methods in Mapping the Different Types of Kimberlites in Pipes of Complex Structure.Geologii i Geofiziki, No. 8, PP. 96-L00. French Geological Survey (BRGM) TRANSLATION No. 5367.RussiaBlank
DS1960-0967
1968
Ilupin, I.P.Ilupin, I.P.The Sodium and Potassium Content of Kimberlites FromyakutiaVses. Ucheb. Zavd. Izv. Geol. Razv., No. 10, PP. 43-47.RussiaBlank
DS1960-0973
1968
Ilupin, I.P.Khar'kiv, A.D., Ilupin, I.P.An Occurrence of Pentlandite in the Komsomolsky Kimberlite Pipe.Geologii i Geofiziki, No. 4, PP. 108-110.RussiaBlank
DS1960-1133
1969
Ilupin, I.P.Ilupin, I.P.Composition and Genesis of Kelyphitic Rims Around Pyrope In yakutian Kimberlite.Niiga., No. 16, PP. 45-52.RussiaBlank
DS1960-1134
1969
Ilupin, I.P.Ilupin, I.P.Composition of Primary Minerals and Chemical Composition Of kimberlites of Yakutia.Zap. Vses. Miner. Obshch., PT. 98, No. 5, PP. 574-578.RussiaBlank
DS1970-0095
1970
Ilupin, I.P.Ilupin, I.P.Phosphorous and Sulfur Content in Yakutian KimberlitesGeochemistry International (Geokhimiya)., No. 9, PP. 1042-1052.RussiaBlank
DS1970-0096
1970
Ilupin, I.P.Ilupin, I.P.Some Characteristics of the Chemical Composition of Kimberlites.Akad. Nauk Sssr Sib. Otd. Yakut. Fil. Institute Geol., RussiaBlank
DS1970-0097
1970
Ilupin, I.P.Ilupin, I.P., Kozlov, I.T.Zircon in KimberlitesIn: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 254-266.RussiaBlank
DS1970-0098
1970
Ilupin, I.P.Ilupin, I.P., Leveshev, P.P.Application of X-ray Analysis in the Study of the Groundmass of Kimberlite.In: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 301-307.RussiaBlank
DS1970-0099
1970
Ilupin, I.P.Ilupin, I.P., Nagaeva, N.P.Chromium and Nickel in an Ilmenite from the Yakutian Kimberlites.In: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 288-300.RussiaBlank
DS1970-0100
1970
Ilupin, I.P.Ilupin, I.P., Pankratov, A.A., Chernyy, YE.D.K.Limits of the Term KimberliteIn: Geology, Petrography And Mineralogy of Magmatic Formatio, RussiaBlank
DS1970-0115
1970
Ilupin, I.P.Krivonos, V.F., Ilupin, I.P., Savrasov, D.I.New Methods of Estimating the Age of Kimberlites with the Lena Region As Example, Northeast Siberian PlatformIn: Geology, Petrography And Mineralogy of Magmatic Formatio, PP. 67-75.RussiaBlank
DS1970-0186
1970
Ilupin, I.P.Rovsha, V.S., Ilupin, I.P.Chrome Spinels in Kimberlites of YakutiaGeologii i Geofiziki, No. 2, PP. 47-56.RussiaBlank
DS1970-0310
1971
Ilupin, I.P.Ilupin, I.P.Characteristics of the Chemical Composition of Ilmenite FromLeningrad: Arctic Geol. Res. Institute Ussr, PP. 85-89.RussiaBlank
DS1970-0311
1971
Ilupin, I.P.Ilupin, I.P.Pyrope and Picroilmenite in Kimberlites of YakutiaZap. Vses. Miner. Obshch., PT. 100, No. 4, PP. 509-512.RussiaBlank
DS1970-0312
1971
Ilupin, I.P.Ilupin, I.P.Some Features of Chemical Composition of Ilmenite from Kimberlites.In: Kimberlite Volcanism And Prospects For Primary Diamond C, RussiaBlank
DS1970-0313
1971
Ilupin, I.P.Ilupin, I.P., Khomiakov, A.P., Balashov, I.A.Rare Earths in Accessory Minerals of Yakutian KimberlitesDoklady Academy of Science USSR, Earth Science Section., Vol. 201, PP. 272-274.RussiaBlank
DS1970-0314
1971
Ilupin, I.P.Ilupin, I.P., Lutz, B.G.Chemical Composition of Kimberlite and Genesis of Kimberlite Magma.Sovetsk. Geol., No. 6, PP. 6L-73.RussiaBlank
DS1970-0315
1971
Ilupin, I.P.Ilupin, I.P., Rabkin, M.I.Chemical Composition Characteristics of Ilmenite from Kimberlites.Leningrad: Nauch. Issled. Institute Geol. Arktiki, PP. 85-89.Russia, DaldynBlank
DS1970-0316
1971
Ilupin, I.P.Ilupin, I.P., Rovsha, V.S.Morphological Characteristics of Kelyphite Zones and Pyropein Kimberlite of Yakutia.Vses. Uch. Zaved. Izv. Geol. Razved., No. 8, PP. 52-54.RussiaBlank
DS1970-0317
1971
Ilupin, I.P.Ilupin, I.P., Varshal, G.M., Pavlutskaya, V.I., Kelenchuk, G.E.Rare Earth Elements in Yakutian KimberlitesGeochemistry International, Vol. 8, PP. 106-110.RussiaBlank
DS1970-0401
1971
Ilupin, I.P.Rovsha, V.S., Ilupin, I.P., Teleshova, R.I.The Composition of Monoclinic Pyroxenes from Kimberlite. In: Kimberlite Volcanism and the Primary Content in the Northeast Part of the Siberian PlatformLeningrad: Niiga., PP. 81-84.RussiaBlank
DS1970-0539
1972
Ilupin, I.P.Ilupin, I.P.Chemical Mineralogical Variations of the Successive Phases Of Kimberlite Intrusions.Geologii i Geofiziki, No. 2, PP. 151-157.RussiaBlank
DS1970-0540
1972
Ilupin, I.P.Ilupin, I.P., Kharkiv, A.D.Amphibolitized Kimberlite in the 'sytykanskaya' PipeGeologii i Geofiziki, No. 7, PP. 130-133.RussiaBlank
DS1970-0724
1973
Ilupin, I.P.Ilupin, I.P., Rovsha, V.S.Mineralogy of Orthopyroxene in KimberlitesDoklady Academy of Sciences Nauk SSSR., Vol. 205, No. L, PP. 181-184.RussiaBlank
DS1970-0804
1973
Ilupin, I.P.Pavlov, D.I., Ilupin, I.P.Halite in Yakutian Kimberlite, its Relation to Serpentine And the Source of its Parent Solutions.Doklady Academy of Science USSR, Earth Science Section., Vol. 213, No. 1-6, PP. 178-180.RussiaKimberlite
DS1970-0936
1974
Ilupin, I.P.Ilupin, I.P., Milashin, V.A., et al.Mineralogy, Geochemistry and Prediction of Diamond DepositsLeningrad:, RussiaKimberlite, Kimberley
DS1975-0284
1976
Ilupin, I.P.Gogoleva, R.A., Ilupin, I.P., Kamysheva, G.G.Influence of Basement Rocks on Kimberlite CompositionIzvestiya Akad. Nauk Sssr, Geol. Ser., 1976, 04, PP. 35-40.RussiaKimberlite, Genesis
DS1975-0534
1977
Ilupin, I.P.Ilupin, I.P.Pecularities of the Chemical Composition of Perovskite and Ilmentite from Yakutia's Kimberlites.Zapiski Veses Mineral. Obshch., No. 6, PP. 719-722.RussiaGeochemistry
DS1975-0785
1978
Ilupin, I.P.Komarov, A.N., Ilupin, I.P.New Dat a on the Age of Kimberlites from Yakutia: Applications of Trace Dating Techniques.Geochemistry International (Geokhimiya)., Vol. 1978, No. 7, JULY, PP. 1004-1014.Russia, YakutiaGeochronology
DS1975-1079
1979
Ilupin, I.P.Ilupin, I.P.New Dat a on the Geochemistry of Uranium in KimberliteDoklady Academy of Science USSR, Earth Science Section., Vol. 249, No. 1-6, PP. 168-170.RussiaGeochemistry
DS1982-0386
1982
Ilupin, I.P.Malinko, S.V., Ilupin, I.P., Berman, I.B., Stoliarova, A.N.Boron in Kimberlites of the Kuoika Field According to the Dat a of Local Radioagraphic Analysis.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 265, No. 1, PP. 170-172.RussiaSpectrometry, Boron
DS1982-0647
1982
Ilupin, I.P.Yakubovskaya, N.YE., Ilupin, I.P.Magnetic Properties of Picroilmenite of Siberian KimberlitesMineral. Zhurn., No. 4, PT. 5, PP. 36-43.RussiaBlank
DS1983-0322
1983
Ilupin, I.P.Ilupin, I.P.Relationship of Kimberlite to Other Igneous Rocks and the Problem of Kimberlite-magma Generation.Doklady Academy of Sciences ACAD. NAUK USSR EARTH SCI. SECTION., Vol. 261, No. 1-6, PP. 141-144.RussiaGenesis, Related Rocks
DS1983-0323
1983
Ilupin, I.P.Ilupin, I.P.Tantalum in Ilmenites of Kimberlites and in Kimberlites of Siberia.(russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 272, No. 5, pp. 1212-1214RussiaBlank
DS1983-0380
1983
Ilupin, I.P.Kuleshov, V.N., Ilupin, I.P.Carbon and Oxygen Isotope Compositions for Carbonates in Siberian Kimberlite Pipes.International Geology Review, Vol. 25, No. 11, PP. 1352-1357.RussiaGeochronology
DS1984-0295
1984
Ilupin, I.P.Genshaft, YU.S., Ilupin, I.P., Rovsha, V.S.A New Discovery of a Graphite Ilmenite Silicate Intergrow thin the Yakutian Kimberlites.Mineral. Zhurn., Vol. 6, No. 2, PP. 55-61.RussiaAlakit, Druzhba, Mir, Sytykan, Monastery, Frank Smith, Stockdale
DS1984-0296
1984
Ilupin, I.P.Genshaft, YU.S., Ilupin, I.P., Rovsha, V.S.Discovery of a Graphic Ilmenite Silicate Intergrowth in Yakutian Kimberlites.Mineral. Zhur., Vol. 6, No. 2, PP. 55-61.Russia, YakutiaPetrography
DS1984-0369
1984
Ilupin, I.P.Ilupin, I.P.Finds of Kimberlite Minerals in Non-kimberlitic Igneous Rocks. (russian)Trudy Tsentr. N. I. Geol. Razed., In: Ta. Tsv. Blagorod. Met., (Russian), No. 188, pp. 46-51GlobalBlank
DS1984-0370
1984
Ilupin, I.P.Ilupin, I.P., Vitozhents, G.CH., Kulighin, V.M.Sodium, Potassium, Cesium, Barium in Kimberlites of SiberiaGeokimiya., No. 7, JULY PP. 1014-1019.Russia, SiberiaGeochemistry, Kimberlites, Sodium, Cesium, Barium
DS1984-0730
1984
Ilupin, I.P.Timofeyev, A.A., Ilupin, I.P., Genshaft, I.S.Spatial Distribution of Ilmenites with Different Content Of magnesium in Yakutian Kimberlites.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 278, No. 2, PP. 461-464.RussiaBlank
DS1984-0731
1984
Ilupin, I.P.Timofeyev, A.A., Ilupin, I.P., Genshaft, Y.S.Spatial distribution of ilmenites with varying amounts of manganese in kimberlites from Yakutia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 278, No. 2, pp. 461-464RussiaPetrology, Ilmenite
DS1985-0300
1985
Ilupin, I.P.Ilupin, I.P.Tantalum in Ilmenites from Kimberlites and from Kimberlite Matrix of the Siberian Province.Doklady Academy of Science USSR, Earth Science Section., Vol. 272, No. 1-6, MARCH PP. 161-164.RussiaPetrography
DS1985-0301
1985
Ilupin, I.P.Ilupin, I.P., Vitozhents, G.CH., Kuligin, V.M.Instrumental neutron activation analysis for sodium, potassium, cesium and barium in Siberian kimberlitesGeochemistry International, Vol. 22, No. 1, pp. 50-55RussiaBlank
DS1985-0518
1985
Ilupin, I.P.Pavlov, D.I., Ilupin, I.P., Gorbache, S.E.Buried Brines of the Siberian Platform As a Possible Fact orin Transformation of Primary Kimberlitic Composition.Izves. Akad. Nauk Sssr., RussiaBlank
DS1985-0519
1985
Ilupin, I.P.Pavlov, D.I., Ilupin, I.P., Gorbacheva, S.A.Buried brines of the Siberian platform a possible factor of the transformation of the original composition of kimberlites.(Russian)Izv. Akad. Nauk SSR Ser. Geol., (Russian), No. 3, pp. 44-53RussiaKimberlite, Geochemistry
DS1985-0520
1985
Ilupin, I.P.Pavlov, D.I., Ilupin, I.P., Gorbacheva, S.A.Connate brines of the Siberian platforms as a factor in the alteration ofkimberliteInternational Geology Review, Vol. 27, No. 5, May pp. 600-609RussiaMirnyy, Udachnyy, Halite, Mineral Chemistry
DS1985-0535
1985
Ilupin, I.P.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
DS1986-0036
1986
Ilupin, I.P.Bagdasarov, E.A., Ilupin, I.P.Coexisting ilmenites and titanomagnetites of matrix mass ofkimberlites.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 290, No. 4, pp. 945-948RussiaPetrology
DS1986-0379
1986
Ilupin, I.P.Ilupin, I.P.Distribution of zinc in kimberlites of South Africa and Siberia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 291, No. 4, pp. 972-974RussiaSouth Africa, Zinc
DS1986-0380
1986
Ilupin, I.P.Ilupin, I.P., Genshaft, Yu.S.Metasomatic replacement of picroilmenite in kimberlites.(Russian)Mineral Zhon., (Russian), Vol. 8, No. 5, pp. 65-72RussiaMetasomatism, Geochemistry
DS1987-0107
1987
Ilupin, I.P.Cherenkov, V.G., Komarov, A.N., Cherenko, A.F., Ilupin, I.P.On the age of Kharamaisky field kimberlites.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 296, No. 1, pp. 196-199RussiaGeochronology
DS1987-0155
1987
Ilupin, I.P.Distler, V.V., Ilupin, I.P., Laputina, I.P.Sulfides of deep seated origin in kimberlites and some Aspects of coppernickel mineralizationInternational Geology Review, Vol. 29, No. 4, April pp. 456-464RussiaBlank
DS1987-0308
1987
Ilupin, I.P.Ilupin, I.P.Relation between ferrous and ferric iron in kimberlites of Siberia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 295, No. 5, pp. 1207-1210RussiaKimberlites, Iron
DS1987-0309
1987
Ilupin, I.P.Ilupin, I.P.Relation between ferrous and ferric iron in Siberian kimberlites. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 295, No. 5, pp. 1207-1210RussiaBlank
DS1987-0310
1987
Ilupin, I.P.Ilupin, I.P., Sviridov, A.M.New dat a on geochemical zones of the Daldyn kimberlite deposit.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 297, No. 1, pp. 200-203RussiaGeochemistry, Dalydn
DS1987-0311
1987
Ilupin, I.P.Ilupin, I.P., Sviridov, A.M.New dat a on the geochemical zoning of the Daldyn sky kimberlitefield.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 297, No. 1, pp. 200-203RussiaBlank
DS1988-0030
1988
Ilupin, I.P.Bagdasarov, Yu.A., Ilupin, I.P.Trends in the composition of micro- and macrocrystals of kimberliticilmenites.(Russian)Zap. Vses. Mineral. O-Va, (Russian), Vol. 117, No. 6, pp. 686-691GlobalMineralogy, Crystallography, Ilmenites
DS1988-0031
1988
Ilupin, I.P.Bagdasarov, Yu.A., Ilupin, I.P.Coexisting ilmenite and titanomagnetite from kimberlite cementDoklady Academy of Science USSR, Earth Science Section, Vol. 290, No. 1-6, March pp. 174-176RussiaGeochemistry, Analyses
DS1988-0032
1988
Ilupin, I.P.Bagdasarov, Yu.A., Ilupin, I.P.Evolution of compositions of microcrystalline and macrocrystalline kimberlitic ilmenites. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 302, No. 5, pp. 1201-1204RussiaMineralogy, Crystallography, Ilmenites
DS1988-0318
1988
Ilupin, I.P.Ilupin, I.P.Zinc distribution in kimberlites of South Africa and SiberiaDoklady Academy of Science USSR, Earth Science Section, Vol. 291, No. 1-6, May pp. 208-210Russia, South AfricaKimberlites, Zinc
DS1988-0740
1988
Ilupin, I.P.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
DS1989-0676
1989
Ilupin, I.P.Ilupin, I.P.Is silicon or magnesium in excess during olivine serpentinization inkimberlites?Geochemistry International, Vol. 26, No. 1, January pp. 123-125RussiaKimberlite, Serpentinization
DS1989-0865
1989
Ilupin, I.P.Lebedeva, L.I., Ilupin, I.P.Thorium in kimberlites of the Siberian Platform*(in Russian)Protessy Kontsentrir. Toriya V Zem Kore M., (Russian), pp. 9-18RussiaKimberlite, Thorium
DS1989-1479
1989
Ilupin, I.P.Taskayev, V.I., Ilupin, I.P.Clinohumite from kimberlites; chemical composition and the specific of isomorphic replacements.(Russian)Mineral. Zhurnal, (Russian) Akad. Nauk SSSR, Dal'nevost. Geol. Inst, Vol. 11, No. 6, pp. 29-38RussiaGeochemistry, Humite group
DS1989-1566
1989
Ilupin, I.P.Votyakov, S.L., Ilupin, I.P., Krasnobaev, A.A., Krokhalev, V.Ya.ESR and luminescence of zircons and apatites from kimberlites of SiberiaGeochemistry International (Geokhimiya), (Russian), No. 1, pp. 29-35RussiaLuminescence, Zircons, apatite
DS1989-1567
1989
Ilupin, I.P.Votyakov, S.L., Ilupin, I.P., Krasnobayev, A.A., Krokhalev, V.Ya.ESR and luminescence of Siberian kimberlite zircon and apatiteGeochemistry International, Vol. 26, No. 8, pp. 26-32RussiaSpectroscopy -luminesence, Zircon/apatite
DS1990-0242
1990
Ilupin, I.P.Brodskaya, S.Y., Sharanova, Z.V., Genshaft, Y.S., Ilupin, I.P.Temperatures of secondary geologic processes in the Yakutia kimberlites evaluated from magneticdata.(Russian)Izvest. Akad. Nauk, SSSR, (Russian), No. 1, January pp. 62-70. ISI# CR 707RussiaGeophysics -magnetics, Alteration
DS1990-0740
1990
Ilupin, I.P.Ilupin, I.P.Mineralogical and geochemical pecularities of kimberlites from the Northern and southern Siberian kimberlite province.(Russian)Tsentr. Nauchn. Issled. Geol. Institute Tsvretm. I. Glagordn. Met., Vol. 65, No. 1, pp. 123-129RussiaPetrology, Kimberlite
DS1990-0869
1990
Ilupin, I.P.Komarov, A.N., Ilupin, I.P.Fission track dating of the Siberian platform kimberlitesGeochemistry International, Vol. 27, No. 10, pp. 55-61East AfricaGeochronology, Kimberlites -zircon
DS1990-0870
1990
Ilupin, I.P.Komarov, A.N., Ilupin, I.P.Geochronology of kimberlites of the Siberian platform track studies.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 3, March pp. 365-372RussiaGeochronology, Kimberlites
DS1990-0871
1990
Ilupin, I.P.Komarov, A.N., Ilupin, I.P.Geochronology of kimberlites of the Siberian platform track studies.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 3, March pp. 365-372RussiaKimberlites, Geochronology
DS1991-0127
1991
Ilupin, I.P.Blinova, G.K., Ilupin, I.P., Frolova, L.N.Impurity centers in diamonds from two regions of Siberian PlatformSoviet Geology and Geophysics, Vol. 32, No. 8, pp. 76-78RussiaDiamond morphology, Nitrogen
DS1991-1694
1991
Ilupin, I.P.Taskayev, V.I., Ilupin, I.P.Clinohumite associates K-richterite in the Kollektivnaya kimberlite pipeDoklady Academy of Sciences USSR Earth Science Scetion, Vol. 310, No. 1-6, September pp. 153-156RussiaMineralogy K-richterite, Kollektivnaya pipe
DS1992-0750
1992
Ilupin, I.P.Ilupin, I.P., Genshaft, V.S.On Inter relation of kimberlite chemical composition, size and content Of the comprised olivines.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 326, No. 2, pp. 341-344RussiaMineral chemistry, Olivine, kimberlite
DS1993-0516
1993
Ilupin, I.P.Genshaft, Y.S., Ilupin, I.P.Are olivines in kimberlites phenocrystals or xenocrystals.(Russian)Doklady Academy of Sciences Akad. Nauk., (Russian), Vol. 331, No. 1, July pp. 66-68.RussiaKimberlites, Olivines
DS1993-0711
1993
Ilupin, I.P.Ilupin, I.P., Griffin, W.L., Kaminsky, F.V.1st dat a on Zn in garnets from Yakutian kimberlites.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR*(in Russian), Vol. 332, No. 1, Sept. pp. 70-74.Russia, YakutiaZinc in garnets, Kimberlites
DS1994-0804
1994
Ilupin, I.P.Ilupin, I.P., Genshaft, Y.S.New dat a on differences between kimberlites northeast and northwest field groups of Yakutian Province(Russian)Doklady Academy of Sciences Nauk SSR, (Russian), Vol. 338, No. 2, Sept. pp. 207-210.Russia, YakutiaGeochemistry, Kimberlites
DS1994-0805
1994
Ilupin, I.P.Ilupin, I.P., Genshaft, Y.S.New dat a on differences between kimberlites northeast and northwest field groups of Yakutian kimberlitic province.(Russian)Doklady Academy of Sciences Nauk, (Russian), Vol. 338, No. 1, Sept. pp. 207-210.Russia, YakutiaKimberlites, Geochemistry
DS1994-0806
1994
Ilupin, I.P.Ilupin, I.P., Genshaft, Yu.S.The correlation between kimberlite composition and olivine concentration and grain size.Doklady Academy of Sciences USSR, Vol. 327A, Nov. pp. 139-142.Russia, YakutiaKimberlite -olivine, Deposit -Daldyn, Alakit
DS1995-0841
1995
Ilupin, I.P.Ilupin, I.P.Geochemical and mineralogical pecularities of different age kimberlites of Siberian Province.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 248.Russia, SiberiaGeochemistry, Geochronology
DS1995-0842
1995
Ilupin, I.P.Ilupin, I.P., Griffin, W.L., Kaminsky, F.V.Zinc in kimberlite garnets from YakutiaDoklady Academy of Sciences USSR, Vol. 333, No. 8, August, pp. 74-79.Russia, YakutiaMicroprobe - garnets, Zinc
DS1996-0511
1996
Ilupin, I.P.Genshaft, Yu.S., Ilupin, I.P.Olivine in kimberlites: phenocrysts or xenocrystals?Doklady Academy of Sciences, Vol. 336, pp. 22-26.RussiaKimberlite petrology
DS1996-0662
1996
Ilupin, I.P.Ilupin, I.P., Genshaft, Yu.S.New dat a on the differences between kimberlites in the northeast and northwest field groups in the Yakutian kimberlite provDoklady Academy of Sciences, Vol. 341A, No. 3, April, pp. 77-82.Russia, YakutiaDiamond composition, Geochemistry
DS1997-0530
1997
Ilupin, I.P.Ilupin, I.P.Chemical composition of chrome spinellid and the heterogeneity of the Daldyn kimberlite field.Geochemistry International, Vol. 35, No. 6, June 1, pp. 527-531.RussiaGeochemistry - chromite, Deposit - Daldyn
DS1997-0531
1997
Ilupin, I.P.Ilupin, I.P.Manganese as an indicator of mantle heterogeneity beneath the Siberian kimberlite Province.Geochemistry International, Vol. 35, No. 3, March 1, pp. 227-234.Russia, Siberia, YakutiaMantle chemistry, diamond inclusion, Deposit - Siberia province
DS1997-0532
1997
Ilupin, I.P.Ilupin, I.P.Relationships between the copper, nickel and titanium contents in Yakutiankimberlites.Geochemistry International, Vol. 35, No. 4, April pp. 379-385.Russia, YakutiaDiamond inclusions, Deposit - Yakutia
DS1998-0652
1998
Ilupin, I.P.Ilupin, I.P., Klochkov, I.K.The first find of copper and nickel rich garnet peridotite xenolith fromkimberlite.Doklady Academy of Sciences, Vol. 361, No. 5, pp. 638-41.RussiaXenoliths, Copper, nickel peridotite
DS1999-0265
1999
Ilupin, I.P.Griffin, W.L. , Ryan, C.G., Ilupin, I.P.The Siberian lithosphere traverse: mantle terranes and the assemblyof the Siberian Craton.Tectonophysics, Vol. 310, No. 1-4, Sept. 15, pp. 1-36.Russia, SiberiaTectonics, lithosphere, Craton, terranes
DS1999-0324
1999
Ilupin, I.P.Ilupin, I.P.Cobalt - nickel and Cobalt - magnesium relations in Siberian kimberlitesGeochemistry International, Vol. 37, No. 7, pp. 688-92.Russia, SiberiaGeochemistry, Deposit - Kharamaiskoe, Yakutia
DS2000-0516
2000
Ilupin, I.P.Kononova, V.A., Pervov, V.A., Ilupin, I.P.Geochemical and mineralogical correlation of kimberlites from Timan and Zimnii Bereg.Doklady Academy of Sciences, Vol. 372, No. 4, May-June pp. 724-7.RussiaGeochemistry, Deposit - Timan, Zimnii
DS2001-0500
2001
Ilupin, I.P.Ilupin, I.P.Intricate structure of the Zarnitsa kimberlite pipeDoklady, Vol.383, No. 1-2, Feb-Mar. pp. 215-7.Russia, YakutiaStructure, Deposit - Zarnitsa
DS2002-0552
2002
Ilupin, I.P.Genshaft, Yu.S., Ilupin, I.P.On genetic classification of chromian spinels in deep seated rocks from continental structures.Russian Journal of Earth Science, Vol. 4, 2, April, pp.RussiaMineralogy - spinels
DS2002-1250
2002
Ilupin, I.P.Pervov, V.A., Kononova, V.A., Ilupin, I.P., Simakov, S.K.PT parameters of formation of rocks included as xenoliths in kimberlites of middle Timan.Doklady Earth Sciences, Vol. 386, 7, Sept-Oct.pp. 867-9.Russia, TimanGeochronology
DS2003-0481
2003
Ilupin, I.P.Golubeva, Y.Y., Ilupin, I.P., Zhuravlev, D.Z.Rare earth elements in kimberlites of Yakutia: evidence from ICP MS dataDoklady Earth Sciences, Vol. 391, 5, pp. 693-6.Russia, YakutiaSpectroscopy
DS200412-0687
2003
Ilupin, I.P.Golubeva, Y.Y., Ilupin, I.P., Zhuravlev, D.Z.Rare earth elements in kimberlites of Yakutia: evidence from ICP MS data.Doklady Earth Sciences, Vol. 391, 5, pp. 693-6.Russia, YakutiaSpectroscopy
DS1994-0938
1994
Ilupin, L.P.Kopylova, M.G., Vishnevskiy, A.A., Ilupin, L.P.High uvarovite garnet in the products of exsolution of chromium diopsideDoklady Academy of Sciences USSR, Vol. 326, pp. 108-112.RussiaMineralogy, Deposit -Obnazhennaya
DS1960-0426
1964
Ilupin, P.Bobrievich, A.P., Ilupin, P., et al.Petrography and Mineralogy of the Kimberlitic Rocks of Yakutia.Moscow: Nedra., 190P. International GEOL. CONGRES., DOKL. SOV. GEOL., No. 7, PP. 8RussiaBlank
DS1985-0536
1985
Ilupin.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
DS200712-0876
2007
Ilyasova, A.M.Rasskazov, S.V., Ilyasova, A.M., Konev, A.A., Yasnygina, Maslovskaya, Feflov, Demonterova, SaraninaGeochemical evidence of the Zadoi alkaline ultramafic Massif, Cis Sayan area southern Siberia.Geochemistry International, Vol. 45, 1, pp. 1-14.Russia, SiberiaAlkalic
DS1990-0741
1990
Ilyin, A.V.Ilyin, A.V.Proterozoic supercontinent, its latest Precambrian rifting, breakup, dispersal into smaller continents, and subsidence of their margins: evidence from AsiaGeology, Vol. 18, No. 12, December pp. 1231-1234Russia, ChinaTectonics, Rifting
DS201606-1095
2016
Ilyina, O.V.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.
DS201709-2000
2017
Ilyina, O.V.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.
DS1960-0285
1962
Ilyukhi.Odintsov, M.M., Tverdokhlebov, V.A., Vladimirov, B.M., Ilyukhi.Structure, Volcanism and Diamondiferous Deposits in the Irkutsk Amphitheatre.Moscow: Izdat Nauka., 179P.Russia, IrkutskKimberlite, Kimberley
DS1995-0843
1995
IMA working group on databasesIMA working group on databasesComputer applications and software cataloguesIma Working Group, Fax 1 800 668-0821GlobalComputer, Programs -IMA working group
DS201412-0403
2014
Imada, S.Imada, S., Ohta, K., Yagi, T., Hirose, K., Yoshida, H., Nagahara, H.Measurements of lattice thermal conductivity of MgO to core-mantle boundary.Geophysical Research Letters, Vol. 41, 13, pp. 4542-4547.MantleGeothermometry
DS201601-0034
2015
Imada, S.Nakajima, Y., Imada, S., Hirose, K., Komabayashi, T., Ozawa, H., Tateno, S., Tsutsui, S., Kuwayama, Y., Baron, A.Q.R.Carbon depleated outer core revealed by sound velocity measurements of liquid iron-carbon alloy.Nature Communications, 10.1038/ NCOMMS9942MantleCarbon

Abstract: The relative abundance of light elements in the Earth’s core has long been controversial. Recently, the presence of carbon in the core has been emphasized, because the density and sound velocities of the inner core may be consistent with solid Fe7C3. Here we report the longitudinal wave velocity of liquid Fe84C16 up to 70?GPa based on inelastic X-ray scattering measurements. We find the velocity to be substantially slower than that of solid iron and Fe3C and to be faster than that of liquid iron. The thermodynamic equation of state for liquid Fe84C16 is also obtained from the velocity data combined with previous density measurements at 1 bar. The longitudinal velocity of the outer core, about 4% faster than that of liquid iron, is consistent with the presence of 4-5 at.% carbon. However, that amount of carbon is too small to account for the outer core density deficit, suggesting that carbon cannot be a predominant light element in the core.
DS200612-0626
2006
Imai, A.Ishihara, S., Ohmoto, H., Anhaeusser, C.R., Imai, A., Robb, L.J.Discovery of the oldest oxidized granitoids in the Kaapvaal Craton and its implications for the redox evolution of early Earth.Geological Society of America Memoir, No. 198, pp. 67-80.Africa, South AfricaRedox
DS1988-0777
1988
Imai, O.Yoshioka, T., Imai, O., Ohara, H., Doi, A., Fujimori, N.Thin solid films of ceramic and diamond and their applicationSurf. Coat. Technol, Vol. 36, No. 1-2, pp. 311-318GlobalDiamond applications/coatings
DS201312-0427
2013
Imamura, K.Imamura, K., Ogasawara, Y., Yurimoto, H., Kusakabe, M.Carbon isotope heterogeneity in metamorphic diamond from the Kokchetav UHP dolomite marble, northern Kazakhstan.International Geology Review, Vol. 55, 4, pp. 453-467.Russia, KazakhstanDeposit- Kokchetav
DS1986-0724
1986
Imanbaeva, N.F.Serebryakov, G.V., Imanbaeva, N.F., Shchitchenko, L.M.Procedures in prospecting for diamond deposits of nonkimberliteorigin.(Russian)Probl. I Perspektivy Razv. Prikl. Mineral I Geokhimmii V Kazakh. Alma, pp. 27-37RussiaDiamond prospecting
DS1998-0322
1998
Imbernon, R.A.L.De Oliveira, S.M.B., Imbernon, R.A.L.Weathering alteration and related rare earth elements (REE) concentration in the Catalao Icarbonatite complex, central Brasil.Journal of South American Earth Sci., Vol. 11, No. 4, pp. 379-388.BrazilCarbonatite, Alteration, rare earth elements (REE).
DS1989-0399
1989
Imbus, S.W.Elmore, R.D., Milavec, G.J., Imbus, S.W., Engel, M.H.The Precambrian None such Formation of the North American Rift, sedimentology and organic geochemical aspects of lacustrine depositionPrecambrian Research, Vol. 43, No. 3, May pp. 191-214MidcontinentGeochemistry, Sedimentology
DS201910-2278
2019
Imrem, C.Le Pichon, X., Ceal Sengor. A.M., Imrem, C.Pangea and the lower mantle.Tectonics, in press available Mantlesubduction, hot spots

Abstract: We show that the peripheral Pangea subduction zone closely followed a polar great circle. We relate it to the band of faster-than-average velocities in lowermost mantle. Both structures have an axis of symmetry in the equatorial plane. Assuming geologically long term stationarity of the deep mantle structure, we propose to use the axis of symmetry of Pangea to define an absolute reference frame. This reference frame is close to the slab remnants and NNR frames of reference but disagrees with hot spots based frames. We apply this model to the last 400 Myr. We show that a hemispheric supercontinent appeared as early as 400 Ma. However, at 400 Ma, the axis of symmetry was situated quite far south and progressively migrated within the equatorial plane that it reached at 300 Ma. From 300 to 110-100 Ma, it maintained its position within the equatorial plane. We propose that the stationarity of Pangea within a single hemisphere surrounded by subduction zones led to thermal isolation of the underlying asthenosphere and consequent heating as well as a large accumulation of hot plume material. We discuss some important implications of our analysis concerning the proposition that the succession of supercontinents and dispersed continents is controlled by an alternation from a degree one to a degree two planform.
DS201911-2539
2019
Imren, C.Le Pichon, X., Sengor, A.M.C., Imren, C.Pangea and lower mantle tectonics.Researchgate, doi.org/10.1029/2018TC005445Mantletectonics

Abstract: We show that the peripheral Pangea subduction zone closely followed a polar great circle. We relate it to the band of faster-than-average velocities in lowermost mantle. Both structures have an axis of symmetry in the equatorial plane. Assuming geologically long-term stationarity of the deep mantle structure, we propose to use the axis of symmetry of Pangea to define an absolute reference frame. This reference frame is close to the slab remnants and NNR frames of reference but disagrees with hot spot-based frames. We apply this model to the last 400 Myr. We show that a hemispheric supercontinent appeared as early as 400 Ma. However, at 400 Ma, the axis of symmetry was situated quite far south and progressively migrated within the equatorial plane that it reached at 300 Ma. From 300 to 110-100 Ma, it maintained its position within the equatorial plane. We propose that the stationarity of Pangea within a single hemisphere surrounded by subduction zones led to thermal isolation of the underlying asthenosphere and consequent heating as well as a large accumulation of hot plume material. We discuss some important implications of our analysis concerning the proposition that the succession of supercontinents and dispersed continents is controlled by an alternation from a degree 1 to a degree 2 planform.
DS1975-0767
1978
Imsland, P.Imsland, P.The Oxides of the Jan Mayen RocksJokull, abstract. p. 104.GlobalAlkaline Rocks, Ankramites
DS202007-1149
2019
In Color MagazineIn Color MagazineThe Russian emerald saga - The Mariinsky Priisk mine.incolorMagazine.com, Vol. Fall pp. 26-46.Russiadeposit - Mariinsky Priisk
DS1995-0472
1995
Indares, A.Eaton, D.W., Hynes, A., Indares, A., Rivers, T.Seismic images of eclogites, crustal scale extension and MOHO relief in the eastern Grenville Province.Geology, Vol. 23, No. 9, Sept. pp. 855-858.OntarioEclogites, Geophysics -seismics
DS1995-0844
1995
Indares, A.Indares, A., Rivers, T.Textures, metamorphic reactions and thermobarometry of eclogitizedmetagabbros: a Proterozoic example.Eur. Journal of Mineralogy, No. 1, pp. 43-56.GlobalEclogites, metamorphism
DS1997-0533
1997
Indares, A.Indares, A., Dunning, G.Coronitic metagabbro and eclogite from the Grenville province westernQuebec: geochronology ...Canadian Journal of Earth Sciences, Vol. 34, pp. 891-904.Quebec, Labrador, Ungavametamorphism
DS1998-0653
1998
Indares, A.Indares, A., Dunning, G., Cox, R., Gale, D.high pressure high temperature rocks from the base of thick continentalcrust: Manicouagan imbricate zone.Tectonics, Vol. 17, No. 3, June pp. 426-40.Quebec, Labrador, Ungavametamorphism
DS2000-0429
2000
Indares, A.Hynes, A., Indares, A., Rivers, T., Gobeil, A.Lithoprobe line 55: integration of out of plane seismic results with surface structure, metamorphism....Canadian Journal of Earth Sciences, Vol.37, No.2-3, Feb.Mar, pp.341-58.QuebecGeochronology, Tectonics - Grenville
DS2000-0430
2000
Indares, A.Indares, A., Dunning, G., Cox, R.Tectono-thermal evolution of deep crust in a Mesoproterozoic continental collision setting....Canadian Journal of Earth Sciences, Vol.37, No.2-3, Feb.Mar, pp.325-40.QuebecGeothermometry, Tectonics - Manicouagan
DS2002-1346
2002
Indares, A.Rivers, T., Ketchum, J., Indares, A., Hynes, A.The high pressure belt in the Grenville Province: architecture, timing and exhumationCanadian Journal of Earth Science, Vol.39,5, May, pp.867-93.Quebec, LabradorUHP - eclogite
DS2003-0617
2003
IndependentIndependent, London, UKWhy diamonds are a crook's best friend.....Independent News, June 16, 3p.GlobalNews item, Diamond robbery
DS2001-0501
2001
Independent NewsIndependent NewsWithout a conflict to fuel, diamond miners still work for just 12p a dayIndependent News, Sept. 22, 2p.Sierra LeoneNews item, Conflict diamonds
DS200512-1034
2005
INDEPTH MT TeamSpratt, J.E., Jones, A.G., Nelson, K.D., Unsworth, M.J., INDEPTH MT TeamCrustal structure of the India - Asia collision zone, southern Tibet, from INDEPTH MT investigations.Physics of the Earth and Planetary Interiors, India, Asia, TibetGeophysics, EM and magnetotelluric
DS1920-0157
1923
Indian EngineeringIndian EngineeringDiamonds in India; March, 1923Indian Engineering, MARCH 31IndiaDiamond Industry History, Diamonds Notable
DS1985-0302
1985
Indian MineralsIndian MineralsA Note on the Olivine Lamproites/kimberlites of Maddurnatayanpet Area, mahbubnagar District Andhra PradeshIndian Minerals, Vol. 39, No. 4, pp. 63-64IndiaBlank
DS1859-0047
1834
Indian ReviewIndian ReviewMines of BundelkhandIndian Review., Vol. 3IndiaDiamond Occurrence
DS1989-0677
1989
Indiana Geological SurveyIndiana Geological SurveyMap of Indiana showing directions of bedrock jointingIndiana Geological Survey, Map No. 52, 1: 380, 160 $ 5.00IndianaStructure, Jointing
DS1989-0678
1989
Indiana Geological SurveyIndiana Geological SurveyQuaternary geologic map of IndianaIndiana Geological Survey, Map No. 49, 1: 500, 000 in colour $ 6.00IndianaSurficial geology, Quaternary map
DS1990-0742
1990
Indiana Geological SurveyIndiana Geological SurveyMap of Indiana showing bedrock geologyIndiana Geological Survey, Map No. 50, 1:1, 825, 000 in colour $ 3.50IndianaBedrock
DS1860-0831
1894
Indianapolis JournalIndianapolis JournalDescribes a Diamond Found by Z.t. Staples at Georgetown, Brown County.Indianapolis Journal, Dec. 3RD.United States, Indiana, Great LakesDiamond Occurrence
DS1860-1069
1899
Indianapolis JournalIndianapolis JournalDiamonds Picked UpIndianapolis Sentinel, AUGUST.United States, Indiana, Great LakesDiamond Occurrence
DS1900-0170
1903
Indianapolis StarIndianapolis StarFinding of Stones in Indiana Has Come to Notice of Tiffany's Man.Indianapolis Star., Nov. 8TH.United States, Indiana, Great LakesDiamond Occurrence
DS1900-0234
1904
Indianapolis StarIndianapolis StarIndiana a Banner State for GemsIndianapolis Star, Jan. 2ND.United States, Indiana, Great LakesDiamond Occurrence
DS1900-0303
1905
Indianapolis StarIndianapolis StarPrecious Stones Including Diamonds in Brown CountyIndianapolis Star, SEPT. 20TH. ALSO: MAUFACTURER JEWELLER, Vol. 37, Oct. 12TH.United States, Indiana, Great Lakes, BrownDiamond Occurrence, Diamonds Notable
DS1989-0212
1989
IndiaquaIndiaquaSibeka's latest annual report... No. 69Indiaqua, No. 54, 1989/III, p. 27, 29, 30Central African Republic, China, Angola, United States, Democratic Republic of Congo, BrazilNews item, Sibeka annual report sumM.
DS1989-0679
1989
IndiaquaIndiaquaThailand outperforms even east AsiaIndiaqua, No. 53, 1989/II, p. 75-77, 79ThailandOverview country -brief mention diamonds
DS1993-0712
1993
IndiaquaIndiaquaOverview of Sibeka's 1992 annual reportIndiaqua, Annual 1993/94, pp. 31-33.Democratic Republic of Congo, Brazil, China, Angola, United StatesAnnual Report -precis, Sikeka D'Enterprise
DS1990-0743
1990
Indonesia Geological SurveyIndonesia Geological SurveyGeologic quadrangle maps (series) Enarotali, Omba, RansikiAustralian Bureau of Mineral Resources, 1: 250, 000 in color $ 10.00 eachIndonesiaMaps, Geologic maps
DS1960-0157
1961
Industrial Diamond ReviewIndustrial Diamond ReviewDiamond Deposits in IndiaIndustrial Diamond Review., NOVEMBER P. 217.India, PannaMajhgawan, Ramkherya
DS1989-0680
1989
Industrial Diamond ReviewIndustrial Diamond ReviewDiamond sorting made easyIndustrial Diamond Review, Vol. 49, No. 535, June pp. 265-266GlobalDiamond sorting, Sortoscope system
DS2001-0502
2001
Industrial Diamond ReviewIndustrial Diamond ReviewA review of the industrial applications of CVD diamondsIndustrial Diamond Review, Vol. 61, No. 4, p. 271.GlobalCVD diamonds
DS2001-0503
2001
Industrial Diamond ReviewIndustrial Diamond ReviewDiamond cutting takes the plunge. a report of hydraulically powered machinery now available ...Industrial Diamond Review, Vol. 61, No. 4, pp. 258-9.GlobalDrilling - in water or on land, Sawing
DS2001-0504
2001
Industrial Diamond ReviewIndustrial Diamond ReviewNew diamond research laboratory opensIndustrial Diamond Review, Vol. 61, No. 4, pp. 230-4.GlobalNews item
DS2001-0505
2001
Industrial Information Resources IncIndustrial Information Resources IncCanadian-Israeli group develops Angola's largest diamond mineSouthernEra Res., Welox (Leviev), Oct. 3, 1p.AngolaNews item, SouthernEra, Welox, Leviev
DS2001-0506
2001
Industrial Information Resources IncIndustrial Information Resources IncRussians and De Beers cutting a diamond supply dealIndustrialinfo.com, Oct. 25, 1p.Russia, GlobalNews item, De Beers
DS2001-0507
2001
Industrialinfo.comIndustrialinfo.comCanada's growing diamond industry, in an advisory by industrialinfo.comIndustrialinfo.com, Nov. 30, 1p.Northwest TerritoriesNews item, Ekati, Diavik
DS2003-0618
2003
Industry WatchIndustry WatchClean diamonds act to help US buyers stay clear of conflict diamondsIndustry Watch, May 7, 2p.United StatesNews item, Conflict diamonds
DS1993-0713
1993
InexInexInex cable jig -one page outline handed out at PDA March 30, 1993Inex, 1p. brochureGlobalHeavy mineral concentrates, Equipment brochure
DS2001-0508
2001
Infinite Technology Group Ltd.Infinite Technology Group Ltd.Partners with to deliver de Beers Diamond Information Center online.De Beers Diamond Information Center, Feb. 22, 2p.GlobalNews item - press release, De Beers
DS200812-0165
2008
InfomineBusiness Report, InfomineGabarone is really De Beers best friend.busrep.c.za, March 25, 2p.Africa, BotswanaNews item - De Beers
DS201612-2305
2016
Ingalls, M.Ingalls, M., Rowley, D.B., Currie, B., Colman, A.S.Large scale subduction of continental crust implied by India-Asia mass balance calculation.Nature Geoscience, Vol.9, 11, pp. 848-853.India, AsiaSubduction

Abstract: Continental crust is buoyant compared with its oceanic counterpart and resists subduction into the mantle. When two continents collide, the mass balance for the continental crust is therefore assumed to be maintained. Here we use estimates of pre-collisional crustal thickness and convergence history derived from plate kinematic models to calculate the crustal mass balance in the India-Asia collisional system. Using the current best estimates for the timing of the diachronous onset of collision between India and Eurasia, we find that about 50% of the pre-collisional continental crustal mass cannot be accounted for in the crustal reservoir preserved at Earth’s surface today—represented by the mass preserved in the thickened crust that makes up the Himalaya, Tibet and much of adjacent Asia, as well as southeast Asian tectonic escape and exported eroded sediments. This implies large-scale subduction of continental crust during the collision, with a mass equivalent to about 15% of the total oceanic crustal subduction flux since 56 million years ago. We suggest that similar contamination of the mantle by direct input of radiogenic continental crustal materials during past continent-continent collisions is reflected in some ocean crust and ocean island basalt geochemistry. The subduction of continental crust may therefore contribute significantly to the evolution of mantle geochemistry.
DS201312-0293
2013
IngateGao, S.S., Liu, Reed, Yu, Massinque, Mdala, Moidaki, Mutamina, Atekwana, Ingate, ReuschSeismic arrays to study African Rift initiation.EOS Transaction of AGU, Vol. 94, 24, June 11, pp. 213-214.Africa, southern AfricaGeophysics - seismics
DS1982-0286
1982
Ingebritsen, R.H.Ingebritsen, R.H., St. joe bonaparte pty. ltd., AQUITAINE MINE.El 2528 Grass Plains Nt Final Report 1980-1982Northern Territory Geological Survey Open File Report, No. CR.82/309, 8P.Australia, Northern TerritoryProspecting, Geophysics
DS1993-0969
1993
Ingebritsen, S.E.Manning, C.E., Ingebritsen, S.E., Bird, D.K.Missing mineral zones in contact metamorphosed basaltsAmerican Journal of Science, Vol. 293, No. 9, November pp. 894-938GlobalBasalt
DS201012-0307
2010
Ingebritsen, S.E.Ingebritsen, S.E., Manning, C.E.Permeability of the continental crust: dynamic variations inferred from seismicity and metamorphism.Geofluids, Vol. 10, 1-2, pp. 193-205.MantleChemistry
DS200512-0935
2002
Ingerov, O.I.Saraev, A.K., Pertel, M.I., Nikiforov, A.B., Garat, M.N., Manakov, A.B., Ingerov, O.I.Magnetotelluric exploration for kimberlite pipes in Yakutian Province, Sakha Republic, Russia.Phoenix Geophysics Preprint, English, Jan. 7p. text 17 figuresRussia, Siberia, YakutiaGeophysics - magnetotellurics, Almakinskaya, Mirensky
DS1988-0319
1988
Ingersoll, R.V.Ingersoll, R.V.Tectonics of sedimentary basins - GSA BulletinGeological Society of America (GSA) Bulletin, Vol. 100, No. 11, November pp. 1704-1719GlobalBasins, Tectonics/structure
DS1997-0534
1997
Ingersoll, R.V.Ingersoll, R.V.Phanerozoic tectonic evolution of central California and environsInternational Geology Review, Vol. 39, No. 11, Nov, pp. 957-972CaliforniaTectonics
DS1997-0535
1997
Ingersoll, R.V.Ingersoll, R.V.Phanerozoic tectonic evolution of central California and environsInternational Geology Review, Vol. 39, No. 11, Nov. pp. 957-972.CaliforniaTectonics
DS2001-1224
2001
Ingle, S.Weis, D., Ingle, S., Damasceno, D., Frey, NicolaysenOrigin of continental components in Indian Ocean basalts: evidence from Elan Bank Kerguelen Plateau.Geology, Vol. 29, No. 2, Feb. pp. 147-50.Indian OceanIgneous province - plume, contamination
DS201809-2070
2018
Inglis, E.C.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.
DS201901-0037
2018
Ingram, B.Grantham, G., Eglinton, B., Macey, P.H., Ingram,B., Radeneyer, M., Kaiden, H., Manhica, V.The chemistry of Karoo age andesitic lavas along the northern Mozambique coast, southern Africa and possible implications for Gondwana breakup.South African Journal of Geology, Vol. 121, pp. 271-286.Africa, Mozambiquegeodynamics

Abstract: Major, trace, radiogenic isotope and stable isotope data from lavas along the northeastern coast of Mozambique are described. The whole rock composition data demonstrate that the rocks are dominantly andesitic with compositions typical of calc-alkaline volcanic rocks from arc environments. SHRIMP U/Pb data from zircons indicate that the zircons are xenocrystic, having ages of between 500 Ma and 660 Ma, with the age of the lava constrained by Rb/Sr data at ~184 Ma. Strontium, Nd and Pb radiogenic isotope data support an interpretation of extensive mixing between a Karoo age basaltic magma (dolerite) from Antarctica and continental crust similar in composition to the Mozambique basement. Oxygen isotope data also imply a significant crustal contribution to the lavas. Possible tectonic settings for the lavas are at the margin of a plume or from a locally restricted compressional setting during Gondwana breakup processes.
DS1860-0630
1889
Ingram, J.F.Ingram, J.F.The Land of Gold, Diamonds and IvoryLondon: Whittingham., 215P. (SECOND EDITION 1893).Africa, South Africa, Cape ColonyTravelogue
DS1860-0756
1892
Ingram, J.F.Ingram, J.F.Das Land des Goldes, der Diamanten und des ElfenbeinsHamburg: Grafius And Moller., 238P.Africa, South AfricaTravelogue
DS201201-0850
2011
Ingram, V.Ingram, V., Tieguhong, J.C., Schure, J., Nkamgnia, E.Where artisanal mines and forest meet: socio-economic and environmental impacts in the Congo Basin.Natural Resources Forum, Vol. 35, 4, pp.304-320.Africa, Democratic Republic of CongoCSR
DS1993-0372
1993
Ingrin, J.Doukhan, N., Doukhan, J-C., Ingrin, J., Jaoul, RatteronEarly partial melting in pyroxenesAmerican Mineralogist, Vol. 78, pp. 1246-56.MantleMelting - xenoliths
DS1995-0845
1995
Ingrin, J.Ingrin, J., Madon, M.TEM observations of several spinel garnet assemblages - toward the rheologyof the transition zone.Terra Nova, Vol. 7, No. 5, pp. 509-515.MantlePetrology
DS2000-0431
2000
Ingrin, J.Ingrin, J., Skogby, H.Hydrogen in nominally anhydrous upper mantle minerals: concentration levels and implications.European Journal of Mineralogy, Vol. 12, No. 3, May 1, pp. 543-52.MantleMineralogy
DS2001-0509
2001
Ingrin, J.Ingrin, J., Pacaud, L., Jaoul, O.Anisotropy of oxygen diffusion in diopsideEarth and Planetary Science Letters, Vol. 192, No. 3, pp. 347-61.GlobalMineral chemistry - diopside
DS2002-1336
2002
Ingrin, J.Richard, G., Monnereau, M., Ingrin, J.Is the transition zone an empty water reservoir? Influences from numerical model of mantle dynamics.Earth and Planetary Science Letters, Vol. 205, 1-2, pp. 37-51.MantleWater
DS200412-0160
2004
Ingrin, J.Blanchard, M., Ingrin, J.Kinetics of deuteration in pyrope.European Journal of Mineralogy, Vol. 16, 4,pp. 567-576.TechnologyMineralogy
DS200512-0426
2005
Ingrin, J.Hertweck, B., Ingrin, J.Hydrogen in corporation in a ring woodite analogue: Mg2 GeO4 spinel.Mineralogical Magazine, Vol. 69, 3, June, pp. 337-344.TechnologyRingwoodite
DS200612-0619
2006
Ingrin, J.Ingrin, J., Grant, K.J.H profiles in mantle xenoliths: constraints from diffusion data.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 1. abstract only.MantleGeochemistry
DS200712-0379
2007
Ingrin, J.Grant, K., Ingrin, J., Lorand, J.P., Dumas, P.Water partitioning between mantle minerals from peridotite xenoliths.Contributions to Mineralogy and Petrology, Vol. 154, 1, pp. 15-34.MantleMineralogy - hydrous phase
DS200712-0462
2007
Ingrin, J.Ingrin, J.Volatiles in olivine and pyroxenes and implications for the upper mantle.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 269.MantleWater storage
DS200712-0463
2007
Ingrin, J.Ingrin, J.Volatiles in olivine and pyroxenes and implications for the upper mantle.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 269.MantleWater storage
DS201702-0243
2017
Ingrin, J.Tian, Z-Z., Liu, J., Xia, Q-K., Ingrin, J., Hao, Y-T., Depecker, C.Water concentraion profiles in natural mantle orthopyroxenes: a geochronometer for long annealing of xenoliths within magma.Geology, Vol. 45, 1, pp. 87-90.ChinaBasanites, Foidites

Abstract: Both mantle-derived clinopyroxene and orthopyroxene are generally homogeneous in water concentration, while water content in the coexisting olivine is affected by partial or complete loss during the ascent of the hosting magma. Here, we report the first record of water content profiles (higher water in the cores than in the rims) in natural orthopyroxene grains in peridotite xenoliths hosted by Cenozoic alkali basalts in Tianchang volcano, eastern China. The water contents of the coexisting clinopyroxene grains are homogeneous and are twice that measured in the cores of orthopyroxene grains, confirming previous chemical equilibrium between the two pyroxenes. The olivines (ol) are nearly dry (~0 ppm). These observations demonstrate that H diffusion in mantle orthopyroxene (opx) is faster than in clinopyroxene (cpx), and the relative mobility of H in each mineral phase could be quantified as: Graphic (where is the chemical diffusion coefficient of hydrogen). Combining this with experimental diffusion coefficients from the literature, we infer that (1) the xenoliths remained in contact with the magma below 900 °C for several months, and (2) clinopyroxene remains the more reliable recorder of water from depth, and orthopyroxene should be used more cautiously but can be considered with olivine for tracing slow transport and cooling of magma.
DS201802-0240
2018
Ingrin, J.Gu, X., Ingrin, J., Deloule, E., France, L., Xia, Q.Metasomatism in the sub-continental lithospheric mantle beneath the south French Massif Central: constraints from trace elements, Li and H in peridotite minerals.Chemical Geology, Vol. 478, pp. 2-17.Europe, Franceperidotite

Abstract: Mantle metasomatism by percolating melts/fluids can significantly modify the geochemical and mineralogical compositions of the sub-continental lithospheric mantle (SCLM). We present a detailed study of water contents and Li concentrations and isotopic compositions in mantle minerals from a suite of peridotite xenoliths entrained by a Cenozoic Strombolian volcano in the southern French Massif Central (FMC). Wide ranging clinopyroxene trace element distributions (e.g., (La/Yb)N from 0.25 to 22.21; Ti/Eu ratios from 453 to 4892) suggest that the SCLM has undergone metasomatism by carbonatitic melts/fluids or melts/fluids related to subducted materials. Two amphibole-bearing samples exhibit depletion of light rare earth elements (LREE; (La/Yb)N = 0.26 and 0.30, respectively) in amphiboles, similar to that in co-existing clinopyroxenes; these samples indicate that amphiboles grew during a separate modally metasomatic event predating the cryptic metasomatism accounting for LREE enrichment and negative HFSE anomalies in other samples. Mineral Li concentrations are similar to those in the normal mantle, with inter-mineral Li partitioning nearly equilibrated and intragranular Li distributions nearly homogeneous. However, negative d7Li values of pyroxenes in some samples (as low as - 8.8‰ in clinopyroxene of sample MC38) can be attributed to diffusive exchange with a small-volume melt of moderate Li concentration and light Li isotopic composition, originally associated with a recycled component. Preservation of the currently observed large inter-mineral Li isotopic variations indicates that melt percolation occurred shortly before entrainment of the peridotite xenoliths by the host magma. Mineral water contents vary from 41 to 428 ppm in clinopyroxenes and from 28 to 152 ppm in orthopyroxenes, and their roughly negative co-variation with coexisting olivine Fo contents imply that partial melting was the main control over mineral water content variations in most samples. Varied water contents in LREE-enriched metasomatized samples indicate the involvement of metasomatic agents of different origins. The aqueous agent responsible for generation of amphiboles in two samples did not produce a notable increase in the water contents of coexisting nominally anhydrous minerals.
DS201212-0062
2012
Ings, S.J.Beaumont, C., Ings, S.J.Effect of depleted continental lithosphere counterflow and inherited crustal weakness on rifting of the continental lithosphere: general results.Journal of Geophysical Research, Vol. 117, B8, B08407MantleTectonics
DS1997-0536
1997
Innocent, C.Innocent, C., Michard, A., Hamelin, B.Strontium isotopic evidence for ion exchange buffering in tropical laterites from the Parana, BrasilChemical Geology, Vol. 136, No. 3/4 Apr. 25, pp. 219-232BrazilGeochemistry, Laterites
DS200512-1095
2005
Innocent, F.Tonarini, S., Agostini, S., Innocent, F., Manetti, P.d11B as tracer of slab dehydration and mantle evolution in western Anatolia Cenozoic magmatism.Terra Nova, Vol. 17, 3, pp. 259-264.MantleMagmatism - not specific to diamonds
DS2003-0287
2003
Innocenti, F.Corti, G., Bonini, M., Continelli, S., Innocenti, F., Manetti, P., Sokouris, D.Analogue modelling of continental extension: a review focused on the relations betweenEarth Science Reviews, Vol. 63, No. 3-4, pp. 169-247.MantleMagmatism, tectonics
DS200412-0373
2003
Innocenti, F.Corti, G., Bonini, M., Continelli, S., Innocenti, F., Manetti, P., Sokouris, D.Analogue modelling of continental extension: a review focused on the relations between the patterns of deformation and the preseEarth Science Reviews, Vol. 63, no. 3-4, pp. 169-247.MantleMagmatism, tectonics
DS200412-0374
2004
innocenti, F.Corti, G., Bonini, M., Sokoutis, D., innocenti, F., Manetti, P., Cloetingh, S., Mulugeta, G.Continental rift architecture and patterns of magma migration: a dynamic analysis based on centrifuge models.Tectonics, Vol. 23, 2, TC2012 10.1029/2003 TC001561MantleGeodynamics
DS200712-0266
2007
Innocenti, F.D'Orazio, M., Innocenti, F., Tonarini, S.Carbonatites in a subduction system: the Pleistocene alvikite.Lithos, Vol. 98, 1-4, pp. 313-334.Europe, ItalyCarbonatite
DS2002-1145
2002
InoueNiu, F., Solomon, S.C., Silver, P.G., Suetsugu, InoueMantle transition zone structure beneath the South Pacific Superswell, evidence for a mantle plume...Earth and Planetary Science Letters, Vol.198,3-4,pp.371-80., Vol.198,3-4,pp.371-80.South PacificTectonics, Hot spot - Society
DS2002-1146
2002
InoueNiu, F., Solomon, S.C., Silver, P.G., Suetsugu, InoueMantle transition zone structure beneath the South Pacific Superswell, evidence for a mantle plume...Earth and Planetary Science Letters, Vol.198,3-4,pp.371-80., Vol.198,3-4,pp.371-80.South PacificTectonics, Hot spot - Society
DS1992-0495
1992
Inoue, H.Fukao, Y., Obayashi, M., Inoue, H., Nenbai, M.Subducting slabs stagnant in the mantle transition zoneJournal of Geophysical Research, Vol. 97, No. B 4, April 10, pp. 4809-4822MantleModel transition zone, Subduction -slabs
DS1994-0556
1994
Inoue, H.Fukao, Y., Maruyama, S., Obayashi, M., Inoue, H.Geologic implication of the whole mantle P wave tomographyJournal of the Geological Society of Japan, Vol. 100, No. 1, January pp. 4-23MantleTomography, Geophysics -seismics
DS1994-0557
1994
Inoue, H.Fukao, Y., Maruyama, S., Obayashi, M., Inoue, H.Geologic implication of the whole mantle P wave tomographyJournal of the Geological Society of Japan, Vol. 100, No. 1, January pp. 4-23.MantleTomography, Geophysics -seismics
DS1995-0055
1995
Inoue, M.Arima, M., Inoue, M.high pressure experimental study on growth and resorption of diamond In kimberlite melt.Proceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 8-10.South AfricaPetrology -experimental, Deposit -Wesselton
DS1998-0241
1998
Inoue, T.Chen, J., Inoue, T., Vaughan, M.T.Strength and water weakening of mantle minerals, olivine, wadsleyite andringwoodite.Geophy. Res. Letters, Vol. 25, No. 4, Feb. 15, pp. 575-MantleMineralogy
DS2003-0621
2003
Inoue, T.Irifune, T., Kurio, A., Sakamoto, S., Inoue, T., Suiniya, H.Ultrahard polycrystalline diamond from graphite. CorrectionNature, No. 6923, Feb. 6, p. 599. also No. 6925, p. 806 Feb 20GlobalDiamond synthesis
DS200412-0873
2004
Inoue, T.Irifune, T., Kuiro, A., Sakamoto, S., Inoue, T., Sumiya, H., Funakoshi, K.Formation of pure polycrystalline diamond by direct conversion of graphite at high pressure and high temperature.Physics of the Earth and Planetary Interiors, Vol. 143-144, pp. 593-600.TechnologyUHP - mineralogy
DS200512-1212
2005
Inoue, T.Yamazaki, D., Inoue, T., Okamoto, M., Irifune, T.Grain growth kinetics of ring woodite and its implication for rheology of the subducting slab.Earth and Planetary Science Letters, Advanced in press,MantleSubduction, mantle transition zone
DS200612-0625
2006
Inoue, T.Irifune, T., Higo, Y., Inoue, T., Funakoshi, K.Ultrasonic velocities of majorite garnet and mineralogy of the mantle transition region.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 108.MantleMTR - interferometry
DS200812-0503
2008
Inoue, T.Irifune, T., Higo, Y., Inoue, T., Kono, Y., Ohfuji, H., Funakoshi, K.Sound velocities of majorite garnet and the composition of the mantle transition zone.Nature, Vol. 451, 7180, pp. 814-817.MantleGeophysics - seismics
DS200812-0939
2008
Inoue, T.Rapp, R.P., Irifune, T., Shimizu, N., Nishiyama, N., Norman, M.D., Inoue, T.Subduction recycling of continental sediments and the origin of geochemically enriched reservoirs in the deep mantle.Earth and Planetary Science Letters, Vol. 271, 1-4, pp. 14-23.MantleSubduction
DS200812-1288
2008
Inoue, T.Yamamoto, J., Ando, J-i., Kagi, H., Inoue, T., Yamada, A., Yamazaki, D., Irifune, T.In situ strength measurements on natural upper mantle minerals.Physics and Chemistry of Minerals, Vol. 35, pp. 249-257.MantleRheology, geocbarometry
DS201603-0368
2015
Inoue, T.Chang, Y-Y., Jacobsen, S.D., Bina, C.R., Thomas, S-M., Smyth, J.R., Frost, D.J., Boffa Ballaran, T., McCammon, C.A., Hauri, E.H., Inoue, T., Yurimoto, H., Meng, Y., Dera, P.Comparative compressibility of hydrous wadsleyite and ringwoodite: effect of H2O and implications for detecting water in the transition zone.Journal of Geophysical Research,, Vol. 120, 12, pp. 8259-8280.MantleRingwoodite

Abstract: Review of recent mineral physics literature shows consistent trends for the influence of Fe and H2O on the bulk modulus (K0) of wadsleyite and ringwoodite, the major phases of Earth's mantle transition zone (410-660?km). However, there is little consensus on the first pressure derivative, K0'?=?(dK/dP)P=0, which ranges from about 4 to >5 across experimental studies and compositions. Here we demonstrate the importance of K0' in evaluating the bulk sound velocity of the transition zone in terms of water content and provide new constraints on the effect of H2O on K0' for wadsleyite and ringwoodite by conducting a comparative compressibility study. In the experiment, multiple crystals of hydrous Fo90 wadsleyite containing 2.0 and 0.25?wt?% H2O were loaded into the same diamond anvil cell, along with hydrous ringwoodite containing 1.4?wt?% H2O. By measuring their pressure-volume evolution simultaneously up to 32?GPa, we constrain the difference in K0' independent of the pressure scale, finding that H2O has no effect on K0', whereas the effect of H2O on K0 is significant. The fitted K0' values of hydrous wadsleyite (0.25 and 2.0?wt?% H2O) and hydrous ringwoodite (1.4?wt?% H2O) examined in this study were found to be identical within uncertainty, with K0' ~3.7(2). New secondary-ion mass spectrometry measurements of the H2O content of these and previously investigated wadsleyite samples shows the bulk modulus of wadsleyite is reduced by 7.0(5)?GPa/wt?% H2O, independent of Fe content for upper mantle compositions. Because K0' is unaffected by H2O, the reduction of bulk sound velocity in very hydrous regions of transition zone is expected to be on the order of 1.6%, which is potentially detectible in high-resolution, regional seismology studies.
DS201809-2023
2018
Inoue, T.Fukuyama, K., Kagi, H., Inoue, T., Shinmei, T., Kakizawa, S., Takahata, N., Sano, Y.in corporation of nitrogen into lower mantle minerals under high pressure and high temperature.Goldschmidt Conference, 1p. AbstractMantlenitrogen

Abstract: Nitrogen occupies about 80% of the Earth 's atmosphere and had an impact on the climate in the early Earth. However, the behavior of nitrogen especially in the deep Earth is still unclear. Nitrogen is depleted compared to other volatile elements in deep mantle (Marty et al., 2012). "Missing" nitrogen is an important subject in earth science. In this study, we compared nitrogen incorporation into lower-mantle minerals (bridgmanite, periclase and stishovite) from high-temperature high-pressure experiment using multianvil apparatus installed at Geodynamics Research Center, Ehime University under the conditions of 27 GPa and 1600°C-1900°C. In these experiments, we used Fe-FeO buffer in order to reproduce the redox state of the lower mantle. Two types of starting materials: a powder mixture of SiO2 and MgO and a powder mixture of SiO2, MgO, Al2O3 and Mg(OH)2 were used for starting materials. Nitrogen in recovered samples was analyzed using NanoSIMS installed at Atmosphere and Ocean Research Institute. A series of experimental results revealed that stishovite and periclase can incorporate more nitrogen than bridgmanite. This suggests that periclase, the major mineral in the lower mantle, may be a nitrogen reservoir. Furthermore, the results suggest that stishovite, which is formed by the transition of the SiO2-rich oceanic crustal sedimentary rocks transported to the lower mantle via subducting slabs, can incorporate more nitrogen than bridgmanite (20 ppm nitrogen solubility reported by Yoshioka et al. (2018)). Our study suggests that nitrogen would continue to be supplied to the lower mantle via subducting slabs since approximate 4 billion years ago when the plate tectonics had begun, forming a "Hidden" nitrogen reservoir in the lower mantle.
DS201911-2577
2019
Inoue, T.Xu, C., Inoue, T.Melting of Al-rich phase D up to the uppermost lower mantle and transportation of H2O to the deep Earth.Geochemistry, Geophysics, Geosystems, Vol. 20, 9, pp. 4382-4389.Mantlewater

Abstract: We investigated the stability of the Al-rich dense hydrous magnesium silicate Phase D (PhD) in a MgO-Al2O3-SiO2-H2O system between 14 and 25 GPa at 900-1,500 °C. Al-rich PhD has a very wide stability region from 900 °C and 14 GPa to at least 1,500 °C and 25 GPa, showing strong temperature stability with increasing pressure. Al-rich PhD decomposes to Phase Egg at pressure of the mantle transition zone, whereas it decomposes to d-AlOOH phase with a temperature increase at pressure of the uppermost lower mantle. X-ray diffraction and Raman spectroscopy measurements of Al-rich PhD show that the unit-cell volume is slightly larger, but the Raman spectra resemble that of Al-free PhD. The wide stability region of Al-bearing PhD would contribute an important storage site for water in the mantle transition zone, suggesting that it can deliver a certain amount of water into the lower mantle along hot subduction and even at the normal mantle geothermal P-T condition. Furthermore, the dehydration of Al-bearing PhD might be responsible for a series of observed seismic discontinuities from the transition zone to the uppermost lower mantle and even for deep earthquakes in some typical locations.
DS200412-0866
2003
Insch, P.Insch, P.DTC Sightholders. Unique system of selling diamonds. 70th Anniversary. Diamond Trading Company.Rough Diamond Review, No. 3, December, pp.GlobalDTC - overview
DS2000-0432
2000
Insergueiz-Filipoli, D.Insergueiz-Filipoli, D., Batoul, E., Tric. A.Spectral modelling of mantle convection in a non-orthogonal geometry: applications subduction zones.Comp. and Geosc., Vol. 26, No. 7, pp. 763-78.MantleSubduction, Convection
DS200412-0869
2004
Insight InformationInsight InformationMining Finance .. developing the right financing strategies for today's emerging markets.Insight Mining Business and Investment Forum, Held June 5-6, Toronto, www.insightinfo.comGlobalConference notice - mining finance
DS200412-0867
2004
Insight Information Co.Insight Information Co.Fundamentals of Canadian Mining Taxation. Conference April 19, Toronto.Insight Mining Business and Investment Forum, Held June 5-6, Toronto, GlobalConference - legal, mining taxation
DS200412-0868
2004
Insight Information CompanyInsight Information CompanyNew Brownfields regulation in Ontario. Ensuring your compliance with new law on remediation.Conference, Insight Information, Oct. 5-6. Toronto, www.insightinfo.comCanada, OntarioConference - environmental, legal
DS1997-0537
1997
Institute Geology of Ore DepositsInstitute Geology of Ore DepositsMineral deposits associated with placers and weathered rocksGeoexplorers, RussiaConference - Sept. 16-19, Placers, alluvials
DS1995-0555
1995
Institute Lake Superior GeologyForty First Annual Meeting, Institute Lake Superior GeologyProceedings VolumeInstitute on Lake Superior Geology, AbstractsOntario, Wisconsin, MinnesotaGreenstone belts, Book -Table of contents
DS1975-0483
1977
Institute of GeolComputing group and mineral physics group, Institute of GeolA Study of Natural Pyropes by Mossbauer EffectScientia Geol. Sinica., Vol. 13, No. 1, PP. 93-104.ChinaGarnet
DS201012-0308
2010
Institute of Lake Superior GeologyInstitute of Lake Superior GeologyStop 5 Diamonds in the Grassy Portage ultramafic pyroclastic - MetalCorp - GUP property.Institute of Lake Superior Geology, Field Trip Guidebook, Vol. 56, part 2, p.119 - 123.Canada, OntarioGeological description
DS1991-0764
1991
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)African Mining '91 #1Elsevier Applied Science, 364p. approx. $ 130.00AfricaMining, Book -ad
DS1991-0765
1991
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)African Mining '91 #2Institute of Mining and Metallurgy (IMM) Dist. Elsevier, 370pAfrica, Zimbabwe, Ghana, Zambia, Kenya, Tanzania, South AfricaMining, Table of contents
DS1991-0766
1991
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)Alluvial MiningInstitute of Mining and Metallurgy (IMM), 600p. approx. $185.00 United StatesGlobalAlluvial mining, Table of contents
DS1991-0767
1991
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)Alluvial mining conference -international conference to be held Nov.11-13th. London EnglandIndustrial Minerals, No. 283, April advertisementGlobalConference, Alluvial mining
DS1991-0768
1991
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)Alluvial mining... book review and mentions papers on Aredor mine, alluvial processing in generalInstitute of Mining and Metallurgy (IMM), Special volume, 601pGuineaMining, Aredor
DS1992-0751
1992
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)Mineral deposits of Europe - book series pricesInstitute of Mining and Metallurgy (IMM), EuropeBook -ad
DS1992-0752
1992
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)Exploration and the environment -the ninth international symposium in the series Prospecting in areas of glaciated terrain. Brief overview of papersTransactions of the Institute of Mining and Metallurgy (IMM), Vol. 101, Jan-April pp. B48-58GlobalGlacial deposits, Remote sensing, geomorphology, glacial
DS1995-0846
1995
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)African Mining 95Institute of Mining and Metallurgy (IMM) Publ, 590pUganda, Zimbabwe, Ghana, Tanzania, Namibia, MaliMining, economics, gold, exploration, Book -Table of contents
DS1995-0847
1995
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)Mineral resources of Venezuela 1995Institute of Mining and Metallurgy (IMM) and CAMIVEN., Oct/NovVenezuelaConference -ad, Guayana Shield
DS1996-0663
1996
Institute of Mining and Metallurgy (IMM)Institute of Mining and Metallurgy (IMM)Minerals, metals and the environment II. Proceedings of a conference heldSept. 1996 in Prague CzechoslovakiaInstitute of Mining and Metallurgy (IMM)., $ approx. 150.00GlobalBook - ad, Environment and mineral industry
DS1992-0753
1992
Institute on Lake Superior GeologyInstitute on Lake Superior GeologyProceedings -program, abstracts and guidebook. 38th. annual meeting held May 1992Institute on Lake Superior Geology, 200pOntario, Manitoba, Minnesota, Kansas, Michigan, WisconsinStructure, tectonics, sulphides, iron formation, VMS, IF., Proterozoic, Midcontinent, rifting, geophysics, platinum group elements (PGE), nickel
DS1995-0848
1995
Institute on Lake Superior GeologyInstitute on Lake Superior GeologyAnnual meeting to be held in MarathonInstitute on Lake Superior Geology, May 14-17thOntarioConference -ad, Gold, Hemlo, greenstone, Alkaline rocks
DS1996-0664
1996
Integrated Spectronics Pty. LtdIntegrated Spectronics Pty. LtdPIMA II handheld spectrometer -fieldIntegrated Spectronics Pty. Ltd, see adGlobalTechnology -PIMA II, Alteration
DS1995-0849
1995
Intergovernmental Working GroupIntergovernmental Working GroupReport on aboriginal participation in miningInter. Gov. Working Group, sixth Annual Report, 138p. Sept.CanadaLegal, Aboriginal
DS200512-0460
2004
International Accounting Standards BoardInternational Accounting Standards BoardExploration for and evaluation of mineral resources.IASB, 19p.Accounting standards
DS1986-0381
1986
International Atomic Energy AgencyInternational Atomic Energy Agency, Vienna AustriaCorrelation of uranium geology between South America and Africa, mapsInternational Atomic Energy Agency (I.A.E.A.), 4 maps. Map 1 Precambrian cratonic areas and mobile beGlobalMap 4 Alkaline complexes and kimberlites, Map 2 Paleozoic and Gondwana sequences Map 3 Post Gondw
DS2002-0745
2002
International Gemological InstituteInternational Gemological Instituteto open diamond lab in Canada ( Toronto)Canada Newswire, April 24, 1p.TorontoNews item, Diamond - certification
DS200612-0620
2006
International Gemological InstituteInternational Gemological InstituteDiamond industry prepares for 'the Blood Diamond' movie release. IGI certificate of authenticity can alleviate consumer concerns regarding origin of their diamonds.International Geological Institute, May 25, 1/2p.United StatesNews item - diamond provenance
DS1997-0538
1997
International Geological CongressInternational Geological CongressOrigin and history of the EarthIgc 30th, Vol. 1, 150pChinaBook - table of contents, Mantle, history
DS1997-0539
1997
International Geological CongressInternational Geological CongressEnergy and mineral resources for the 21st Century - geology of mineraldeposits, mineral economicsIgc 30th, Vol. 9, 550pChina, Korea, Finland, France, Japan, Colorado, ItalyBook - table of contents, Mineral deposits
DS1997-0540
1997
International Geological CongressInternational Geological CongressOrogenic belts geological mappingIgc 30th, Vol. 7, 170pGlobalBook - table of contents, Tectonics, crust
DS1997-0541
1997
International Geological CongressInternational Geological CongressStructure of the lithosphere and deep processesIgc 30th, Vol. 4, 150pMantleBook - table of contents, Geophysics - seismics
DS1996-0665
1996
International Geological Congress 30th. Beijing ChinaInternational Geological Congress 30th. Beijing ChinaAbstracts - Metallogeny of superlarge depositsIgc Beijing Aug. 4-14, pp. 782-797GlobalLarge mineral deposits, Abstract section
DS1989-0681
1989
International Geological Correlation Programme (IGCP)International Geological Correlation Programme (IGCP)The oldest rocks of the Aldan-Stanovik shield, Eastern Siberia, USSR.Excursion guide for geological field trip to the area, July 1989International Geological Correlation Programme (IGCP) Project 280, Publishing Leningrad -Mainz, 121p. Ontario Geological Survey (OGS) QE 315 044RussiaShield, Guidebook
DS1995-0850
1995
International Geological Correlation Programme (IGCP) ProjectInternational Geological Correlation Programme (IGCP) ProjectPetrology and metallogeny of volcanic and intrusive rocks of The midcontinent rift system #1International Geological Correlation Programme (IGCP) Project 336 Proceedings Volume Abstracts, 200pIndia, Russia, Spain, Minnesota, Michigan, OntarioTectonics, plumes, magmatism, geodynamics, fluids, Book - table of contents
DS1992-0754
1992
International Geology ReviewInternational Geology ReviewNews note: large Russian diamond deposit poised for accelerateddevelopmentInternational Geology Review, March 23, Report on Business p. B13Russia, Commonwealth of Independent States (CIS)Diamond deposit
DS2002-0746
2002
International Geomological InstituteInternational Geomological InstituteToron to lab opens: IGI continues long standing presence in Canada. 27 Queen St. East.Intern. Gemological Institute, July 22, 1p.OntarioNews item - press release
DS201212-0327
2012
International MiningInternational MiningUnbreakable determination … Petra Diamonds overview.International Mining, April 4p.Africa, South AfricaPetra Diamonds overview
DS201212-0328
2012
International MiningInternational MiningMagnificent Cullinan. HistoryInternational Mining, May 4p.Africa, South AfricaHistory - Cullinan
DS201212-0329
2012
International MiningInternational MiningPetra's Kimberley …. Great mines series.International Mining, July 3p.Africa, South AfricaDeposit - Kimberley
DS201212-0330
2012
International MiningInternational MiningGreat mines - Petra's Kimberley and more (underground) International Mining, July 3p.Africa, South AfricaDeposit - Kimberley
DS201412-0404
2014
International MiningInternational MiningGoing deeper at Venetia.International Mining, March pp. 66-76.Africa, South AfricaDeposit - Venetia
DS201412-0405
2014
International MiningInternational MiningGems from nowhere… Ghaghoo mine.. In depth mining focus.International Mining, Sept. pp. 14,16,18,22,24,28,29.Africa, BotswanaDeposit - Ghaghoo
DS1996-0666
1996
International Monetary FundInternational Monetary FundWorld economic outlook - May 1996Imf World Economics And Financial Surveys, 190p. approx. $ 35.00GlobalBook - ad, Economics - outlook note date May 1996
DS201412-0406
2014
International Resource JournalInternational Resource JournalDe Beers the world's leading diamond company discusses its move to Gabarone and its mission to build Botswana into a global diamond hub.International Resource Journal, Jan. pp. 30-37.Africa, BotswanaDe Beers economics
DS201412-0407
2014
International Resource JournalInternational Resource JournalGem Diamonds the owner of the highest average dollar-per-carat kimberlite diamond mine in the world continues to defy expectations with its exceptionally large and high-value stones from Botswan and Lesotho.International Resource Journal, Jan. pp. 38-51.Africa, Botswana, LesothoGem Diamonds overview
DS201412-0408
2014
International Resource JournalInternational Resource JournalDiamond Corp is burying underneath a historic open-pit diamond mine in South Africa to build a new underground mine with significantly higher grade.International Resource Journal, Jan. pp. 52-61.Africa, South AfricaDiamondCorp overview
DS201412-0409
2014
International Resource JournalInternational Resource JournalFirestone Diamonds is close to realizing a high-grade, 15 year diamond operation in Lesotho with potential upside for high-value large stones.International Resource Journal, Jan. pp. 62-69.Africa, LesothoFirestone overview
DS1993-0714
1993
International Symposium on mineralization related to mafic and ultramaficInternational Symposium on mineralization related to mafic and ultramaficAlkaline and carbonatitic magmatism and associated mineralizations..special sessionInternational Symposium on Mineralization Related to Mafic and Ultramafic, September 1-3, 1993, Orleans, FranceFranceSymposium, Alkaline rocks, Carbonatite
DS1996-0667
1996
Intertec PublishingIntertec PublishingMining environmental handbook... description of contents from EMJ issueEngineering and Mining Journal, United StatesBook - ad, Environment - mining handbook
DS201312-0428
2013
IntierraRMGIntierraRMGState of the market: mining and finance report. Exploration hot spots, production outlook, overview of 2012, royalties and taxation briefs.IntierraRMG, Edition 1-2013, 26p.GlobalMarket overviews
DS201112-0561
2011
IntroneKurbatov, A.V., Mayewski, P.A., Steffensen, J.P., West, A., Kennett, Bunch, Handley, Introne, Shane, Mercer etcDiscovery of a nanodiamond rich layer in the Greenland ice sheet.Journal of Glaciology, Vol. 56, no. 199, pp. 747-757.Europe, GreenlandGeomorphology
DS2003-0619
2003
Inzana, J.Inzana, J., Kusky, T., Higgs, G., Tucker, R.Supervised classification of Land sat TM band ratio images and Land sat TM band ratioJournal of African Earth Sciences, Vol. 37, 1-2, July-August pp. 59-72.MadagascarRemote sensing - not specific to diamonds
DS200412-0870
2003
Inzana, J.Inzana, J., Kusky, T., Higgs, G., Tucker, R.Supervised classification of Land sat TM band ratio images and Land sat TM band ratio image with radar for geological interpretatiJournal of African Earth Sciences, Vol. 37, 1-2, July-August pp. 59-72.Africa, MadagascarRemote sensing - not specific to diamonds
DS2000-0527
2000
Ionnidis, N.M.Kostopoulos, D.K., Ionnidis, N.M., Sklavounos, S.A.A new occurrence of ultrahigh pressure metamorphism Central Macedonia: evidence from graphitized diamonds.International Geology Review, Vol. 42, pp. 545-54.GlobalMantle metamorphism, Microspectrometry, ultra high pressure (UHP)
DS1998-0538
1998
IonovGriffin, W.L., O'Reilly, S.Y., Ryan, C.G., Gaul, IonovSecular variation in the composition of lithospheric mantle: geophysical and geodynamic implications.Structure EVol. Austral., American Geophysical Union (AGU) geodynamics Vol. 26, pp. 1-26.MantleGeophysics, geodynamics
DS2000-0037
2000
IonovAshchepkov, V., Salters, Ionov, Litasov, Travin, StrizhovGeochemistry of lherzolite and pyroxenites mantle inclusions from different stages of development VitiM.Igc 30th. Brasil, Aug. abstract only 1p.RussiaMetasomatism, Vitim Volcanic plateau
DS201012-0016
2010
IonovAshchepkov, 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
DS201012-0017
2010
IonovAshchepkov, 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
DS201112-0037
2010
IonovAshchepkov, 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
DS1997-0542
1997
Ionov, D.Ionov, D., Griffin, W.L., O'Reilly, S.Y., Malkovets, V.Carbonate bearing mantle xenoliths in alkali basalts: phase mineral compositions, MetasomatismGeological Association of Canada (GAC) Abstracts, AustraliaXenoliths, Mantle carbonate Metasomatism
DS1998-1135
1998
Ionov, D.Pearson, D.G., Ionov, D., Carlson, ShireyLithospheric evolution in circum cratonic settings: a Re- Os isotope studyof peridotite xenoliths Vitim ...Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1147-8.Russia, VitiM.Geochemistry - whole rock, Spinels
DS2001-0510
2001
Ionov, D.Ionov, D.Carbonates in mantle xenoliths: quenched melts or crystal cumulates?Journal of South African Earth Sciences, Vol. 32, No. 1, p. A 19 (abs)GlobalCarbonatite, Xenoliths - mantle
DS2002-0747
2002
Ionov, D.Ionov, D., Harmer, R.E.Trace element distribution in calcite dolomite carbonatites from Spitskop: inferences differentiationEarth and Planetary Science Letters, Vol.198,3-4,pp.495-510., Vol.198,3-4,pp.495-510.South AfricaCarbonatite magmas, Origin of carbonates in mantle xenoliths
DS2002-0748
2002
Ionov, D.Ionov, D., Harmer, R.E.Trace element distribution in calcite dolomite carbonatites from Spitskop: inferences differentiationEarth and Planetary Science Letters, Vol.198,3-4,pp.495-510., Vol.198,3-4,pp.495-510.South AfricaCarbonatite magmas, Origin of carbonates in mantle xenoliths
DS2002-0800
2002
Ionov, D.Kalfoun, F., Ionov, D., Merlet, C.HFSE residence and Nb Ta ratios in metasomatized, rutile bearing mantle peridotitesEarth and Planetary Science Letters, Vol.199,1-2,pp.49-65., Vol.199,1-2,pp.49-65.MantleMetasomatism, Peridotites
DS2002-0801
2002
Ionov, D.Kalfoun, F., Ionov, D., Merlet, C.HFSE residence and Nb Ta ratios in metasomatized, rutile bearing mantle peridotitesEarth and Planetary Science Letters, Vol.199,1-2,pp.49-65., Vol.199,1-2,pp.49-65.MantleMetasomatism, Peridotites
DS2003-0620
2003
Ionov, D.Ionov, D., Spetsius, Z., Weiss, D., Bodinier, J.L.Hf Nd Sr isotope and trace element evidence for a diversity of origins of rutile bearingGeological Association of Canada Annual Meeting, Abstract onlyRussia, SiberiaGeochronology, Eclogite
DS200412-0871
2004
Ionov, D.Ionov, D.Chemical variations in peridotite xenoliths from Vitim, Siberia: inferences for REE Hf behaviour in the garnet facies upper mantJournal of Petrology, Vol. 45, 2, pp. 343-67.Russia, Siberia, MantleGeochemistry
DS200412-0872
2003
Ionov, D.Ionov, D., Spetsius, Z., Weiss, D., Bodinier, J.L.Hf Nd Sr isotope and trace element evidence for a diversity of origins of rutile bearing eclogite xenoliths from the Siberian CrGeological Association of Canada Annual Meeting, Abstract onlyRussia, SiberiaGeochronology Eclogite
DS200512-0461
2005
Ionov, D.Ionov, D., Prikhodko, V.S., Bodinier, J.L., Sobolev, A.V., Weis, D.Lithospheric mantle beneath the south eastern Siberian Craton: petrology of peridotite xenoliths in basalts from the Tokinsky Stanovik.Contributions to Mineralogy and Petrology, Vol. 149, no. 6, pp. 647-665.Russia, SiberiaXenoliths
DS200712-0737
2007
Ionov, D.Mocek, B., Hellebrand, E., Ionov, D.In situ measurements vs. lattice strain model calculations: distribution of REE between Grt and Cpx in garnet peridotites from Vitim ( Siberia).Plates, Plumes, and Paradigms, 1p. abstract p. A677.Russia, SiberiaVitim
DS200812-0904
2008
Ionov, D.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
DS200912-0668
2009
Ionov, D.Saumet, S., Bascou, J., Ionov, D., Doucet, L.Seismic properties of the Siberian craton mantle from Udachnaya xenoliths.Goldschmidt Conference 2009, p. A1160 Abstract.Russia, SiberiaDeposit - Udachnaya
DS201312-0651
2013
Ionov, D.Nimis, P., Goncharov, A., Ionov, D.Fe3 partitioning systematics between orthopyroxene and garnet in well equilibriated mantle xenoliths.Goldschmidt 2013, AbstractRussia, MongoliaUdachnaya, Obnazhennaya, Dariganaga
DS201707-1339
2017
Ionov, D.Kitayama, Y., Thomassot, E., Galy, A., Golovin, A., Korsakov, A., d'Eyrames, E., Assayag, N., Bouden, N., Ionov, D.Co-magmatic sulfides and sulfates in the Udachnaya-East pipe ( Siberia): a record of the redox state and isotopic composition of sulfur in kimberlites and their mantle sources.Chemical Geology, Vol. 455, pp. 315-330.Russiadeposit - Udachnaya East

Abstract: Kimberlites of the Udachnaya-East pipe (Siberia) include a uniquely dry and serpentine-free rock type with anomalously high contents of chlorine (Cl = 6.1 wt%), alkalies (Na2O + K2O = 10 wt%) and sulfur (S = 0.50 wt%), referred to as a “salty” kimberlite. The straightforward interpretation is that the Na-, K-, Cl- and S-rich components originate directly from a carbonate-chloride kimberlitic magma that is anhydrous and alkali-rich. However, because brines and evaporites are present on the Siberian craton, previous studies proposed that the kimberlitic magma was contaminated by the assimilation of salt-rich crustal rocks. To clarify the origin of high Cl, alkalies and S in this unusual kimberlite, here we determine its sulfur speciation and isotopic composition and compare it to that of non-salty kimberlites and kimberlitic breccia from the same pipe, as well as potential contamination sources (hydrothermal sulfides and sulfates, country-rock sediment and brine collected in the area). The average d34S of sulfides is - 1.4 ± 2.2‰ in the salty kimberlite, 2.1 ± 2.7‰ in the non-salty kimberlites and 14.2 ± 5.8‰ in the breccia. The average d34S of sulfates in the salty kimberlites is 11.1 ± 1.8‰ and 27.3 ± 1.6‰ in the breccia. In contrast, the d34S of potential contaminants range from 20 to 42‰ for hydrothermal sulfides, from 16 to 34‰ for hydrothermal sulfates, 34‰ for a country-rock sediment (Chukuck suite) and the regional brine aquifer. Our isotope analyses show that (1) in the salty kimberlites, neither sulfates nor sulfides can be simply explained by brine infiltration, hydrothermal alteration or the assimilation of known salt-rich country rocks and instead, we propose that they are late magmatic phases; (2) in the non-salty kimberlite and breccia, brine infiltration lead to sulfate reduction and the formation of secondary sulfides – this explains the removal of salts, alkali-carbonates and sulfates, as well as the minor olivine serpentinization; (3) hydrothermal sulfur was added to the kimberlitic breccia, but not to the massive kimberlites. In situ measurements of sulfides confirm this scenario, clearly showing the addition of two sulfide populations in the breccia (pyrite-pyrrhotites with average d34S of 7.9 ± 3.4‰ and chalcopyrites with average d34S of 38.0 ± 0.4‰) whereas the salty and non-salty kimberlites preserve a unique population of djerfisherites (Cl- and K-rich sulfides) with d34S values within the mantle range. This study provides the first direct evidence of alkaline igneous rocks in which magmatic sulfate is more abundant than sulfide. Although sulfates have been rarely reported in mantle materials, sulfate-rich melts may be more common in the mantle than previously thought and could balance the sulfur isotope budget of Earth's mantle.
DS201710-2223
2017
Ionov, D.Danelian, T., Jolivet, M., Ionov, D.Insights into the geology and paleontology of Siberia from French-Siberian collaboration in the Earth Sciences.Bulletin de la Societe Geologique de France *eng, Vol. 188, 1-2, 7p.Russia, Siberiadeposit - Udachnaya
DS201710-2224
2017
Ionov, D.d'Eyrames, E., Thomassot, E., Kitayama, Y., Golovin, A., Korsakov, A., Ionov, D.A mantle origin for sulfates in the unusual "salty" Udachnaya-East kimberlite from sulfur abundances, speciation and their relationship with groundmass carbonates.Bulletin de la Societe Geologique de France *eng, Vol. 188, 1-2, 8p.Russia, Siberiadeposit - Udachnaya-East

Abstract: The Udachnaya-East pipe in Yakutia in Siberia hosts a unique dry (serpentine-free) body of hypabyssal kimberlite (<0.64wt% H2O), associated with a less dry type of kimberlite and a serpentinized kimberlitic breccia. The dry kimberlite is anomalously rich in salts (Na2O and Cl both up to 6wt%) whereas the slightly less dry and the breccia kimberlite are salt free. Yet the Udachnaya kimberlite is a group-I kimberlite, as is the archetypical kimberlite from Kimberley, South Africa. Samples were studied from the three different types of kimberlite (dry-salty, n=8, non-salty, n=5 and breccia, n=3) regarding their mineralogy, geochemistry, and more specifically their sulfur content. Our results show the salty kimberlite is unprecedentedly rich in sulfur (0.13-0.57wt%) compared to the non-salty kimberlite (0.04-0.12wt%) and the breccia (0.29-0.33wt%). In the salty kimberlite, most of the sulfur is present as sulfates (up to 97% of Stotal) and is disseminated throughout the groundmass in close association with Na-K-bearing carbonates. Sulfates occur within the crystal structure of these Na-K-bearing carbonates as the replacement of (CO3) by (SO3) groups, or as Na- and K-rich sulfates (e.g. aphtitalite, (K,Na)3Na(SO4)2). The associated sulfides are djerfisherite; also Na- and K-rich species. The close association of sulfates and carbonates in these S-rich alkaline rocks suggests that the sulfates crystallized from a mantle-derived magma, a case that has strong implication for the oxygen fugacity of kimberlite magmatism and more generally for the global S budget of the mantle.
DS201710-2259
2017
Ionov, D.Radu, I-B., Moine, B., Ionov, D., Korsakov, A., Golovin, A., Mikhailenko, D., Cottin, J-Y.Kyanite-bearing eclogite xenoliths from the Udachnaya kimberlite, Siberian craton, Russia.Bulletin de la Societe Geologique de France *eng, Vol. 188, 1-2, 14p.Russia, Siberiadeposit - Udachnaya

Abstract: Xenoliths brought up by kimberlite magmas are rare samples of otherwise inaccessible lithospheric mantle. Eclogite xenoliths are found in most cratons and commonly show a range of mineral and chemical compositions that can be used to better understand craton formation. This study focuses on five new kyanite-bearing eclogites from the Udachnaya kimberlite pipe (367±5 Ma). They are fine-to coarse-grained and consist mainly of “cloudy” clinopyroxene (cpx) and garnet (grt). The clinopyroxene is Al,Na-rich omphacite while the garnet is Ca-rich, by contrast to typical bi-mineral (cpx+grt) eclogites that contain Fe- and Mg-rich garnets. The Udachnaya kyanite eclogites are similar in modal and major element composition to those from other cratons (Dharwar, Kaapvaal, Slave, West African). The kyanite eclogites have lower REE concentrations than bi-mineral eclogites and typically contain omphacites with positive Eu and Sr anomalies, i.e. a “ghost plagioclase signature”. Because such a signature can only be preserved in non-metasomatised samples, we infer that they were present in the protoliths of the eclogites. It follows that subducted oceanic crust is present at the base of the Siberian craton. Similar compositions and textures are also seen in kyanite eclogites from other cratons, which we view as evidence for an Archean, subduction-like formation mechanism related to craton accretion. Thus, contrary to previous work that classifies all kyanite eclogites as type I (IK), metasomatized by carbonatite/kimberlitic fluids, we argue that some of them, both from this work and those from other cratons, belong to the non-metasomatized type II (IIB). The pristine type IIB is the nearest in composition to protoliths of mantle eclogites because it contains no metasomatic enrichments.
DS1998-0654
1998
Ionov, D. A.Ionov, D. A.Compositional variations in a fertile mantle domain: peridotite xenoliths from the Tariart region, Mongolia.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 685-6.GlobalXenoliths, Geothermometry, Shavaryn-TsaraM.
DS1986-0382
1986
Ionov, D.A.Ionov, D.A., Bushlyakov, I.N., Kovalenko, V.I.Fluorine and Chlorine contnent of phlogopite, amphibole and apatite of deep xenoliths of the Shavaryn-Tsaram volcano in Mongolia.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 287, No. 5, pp. 1205-1209RussiaBlank
DS1986-0460
1986
Ionov, D.A.Kovalenko, V.I., Tsepin, A.I., Ionov, D.A., Ryabchikov, I.D.Garnet pyroxene druse: an example of fluid crystallization in the mantleDoklady Academy of Science USSR, Earth Science Section, Vol. 280, No. 1-6, October pp. 99-102RussiaCrystallography
DS1989-0682
1989
Ionov, D.A.Ionov, D.A., Stosch, H.G., Kovalenko, V.I.Lithophile trace elements in minerals of a complex mantle xenolithDoklady Academy of Science USSR, Earth Science Section, Vol. 296, No. 1-6, pp. 216-220RussiaMantle, Mineralogy, Rare earths
DS1991-0925
1991
Ionov, D.A.Kovalenko, V.I., Ionov, D.A., Yarmolyuk, V.V., Jagoutz, E.Isotope dat a on the evolution of the mantle and its correlation with the evolution of the crust in some parts of central AsiaGeochemistry International, Vol. 28, No. 4, pp. 82-92China, RussiaMantle, Geochronology
DS1992-0755
1992
Ionov, D.A.Ionov, D.A., Hoefs, J., Wedepohl, K.H., Wiechert, U.Content and isotopic composition of sulphur in ultramafic xenoliths from central AsiaEarth and Planetary Science Letters, Vol. 111, pp. 269-286GlobalGeochronology, Xenoliths
DS1992-0756
1992
Ionov, D.A.Ionov, D.A., Hofmann, A.W.Metasomatism induced melting in mantle xenolithsEos, Transactions, Annual Fall Meeting Abstracts, Vol. 73, No. 43, October 27, abstracts p. 657MantleMetasomatism, Xenoliths
DS1993-0715
1993
Ionov, D.A.Ionov, D.A., Ashchepkov, I.V., Stosch, H.G., et al.Garnet peridotite xenoliths from the Vitim volcanic field, Baikal region:the nature of the garnet-spinel peridotite transition zone in the continentalmantle.Journal of Petrology, Vol. 34, No. 6, pp. 1141-1175.Russia, BaikalXenoliths, Peridotite
DS1993-0716
1993
Ionov, D.A.Ionov, D.A., Dupuy, C., O'Reilly, S.Y., Kopylova, M.G., GenshaftCarbonated peridotite xenoliths from Spitzbergen: implications for trace element signature of mantle carbonate MetasomatismEarth and Planetary Science Letters, Vol. 119, No. 3, September pp. 283-298NorwayMantle Metasomatism, Geochronology
DS1993-0717
1993
Ionov, D.A.Ionov, D.A., Dupuy, C., O'Reilly, S.Y., Kopylova, M.G., GenshaftCarbonated peridotite xenoliths from Spitsbergen: implications from trace element signature of mantle carbonate MetasomatismEarth and Planetary Science Letters, Vol. 119, No. 3, September pp. 283-298NorwayXenoliths, Mantle Metasomatism
DS1993-0718
1993
Ionov, D.A.Ionov, D.A., Hoefs, J., Wedepohl, K.H., Wiechert, U.Content of sulfur in different mantle reservoirs - replyEarth and Planetary Sciences, Vol. 119, No. 4, October, pp. 635-640.AsiaXenoliths, Mantle
DS1993-0800
1993
Ionov, D.A.Kempton, P.D., Ionov, D.A.Deep crustal xenoliths from the Kola Peninsula: a window into the lower crust of an Archean terrane.The Xenolith window into the lower crust, abstract volume and workshop, p. 12.RussiaXenoliths, Kola Peninsula
DS1994-0807
1994
Ionov, D.A.Ionov, D.A., Harmon, R.S., et al.Oxygen isotope composition of garnet and spinel peridotites in the continental mantle: evidence from the Vitim xenolith suite, southern Siberia.Geochimica et Cosmochimica Acta, Vol. 58, No. 5. pp. 1463-1470.Russia, SiberiaGeochronology, Vitim xenoliths
DS1994-0808
1994
Ionov, D.A.Ionov, D.A., Hofmann, A.W., Shimizu, N.Metasomatism induced melting in mantle xenoliths from MongoliaJournal of Petrology, Vol. 35, No. 3, June pp. 753-786.GlobalXenoliths
DS1995-0851
1995
Ionov, D.A.Ionov, D.A., Hofmann, A.W.Niobium and Tantalum rich mantle amphiboles and micas: implications for subduction related metasomatic trace elements.Earth and Planetary Science Letters, Vol. 131, No. 3-4, April pp. 341-356.MantleSubduction, Metasomatism
DS1995-0852
1995
Ionov, D.A.Ionov, D.A., O'Reilly, S.Y., Ashchepkov, I.V.Feldspar bearing lherzolite xenoliths in alkali basalts from Harmar-Daban South Baikal region, Russia.Contrib. Mineralogy and Petrology, Vol. 122, No. 1/2, pp. 174-190.Russia, BaikalXenoliths
DS1995-0853
1995
Ionov, D.A.Ionov, D.A., O'Reilly, S.Y., Ashchepkov, I.V.Plagioclase bearing lherzolite xenoliths in alkali basalts from Hamar Daban southern Bank Baikal region.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 249-251.Russia, BaikalXenoliths, Mantle basalt domain
DS1995-0854
1995
Ionov, D.A.Ionov, D.A., Prikhodko, V.S., O'Reilly, S.Y.Peridotite xenoliths in alkali basalts from the Sikhote-Alin southeasternSiberia: trace elementsChemical Geology, Vol. 120, No. 3-4, March 1, pp. 275-294.Russia, SiberiaXenoliths, mantle signatures, Priorie, margin
DS1995-1841
1995
Ionov, D.A.Stosch, H.G., Ionov, D.A., Sharpouri, A.Lower crustal xenoliths from Mongolia and their bearing on the nature Of the deep crust beneath central Asia.Lithos, Vol. 36, No. 3/4, Dec. 1, pp. 227-242.GlobalTectonics, Xenoliths
DS1996-0570
1996
Ionov, D.A.Griffin, W.L., O'Reilly, S.Y., Ionov, D.A., Ryan, C.G.Secular evolution of sub continental mantleGeological Society of Australia 13th. Convention held Feb., No. 41, abstracts p.167.AustraliaMantle, Kimberlites
DS1996-0668
1996
Ionov, D.A.Ionov, D.A.Thermal state of the lithosphere beneath Mongolia and southern Baikal area:implications for lithospheric...Geological Society of Australia 13th. Convention held Feb., No. 41, abstracts p.214.GlobalStructure, geodynamics, mantle dynamics, Baikal area
DS1996-0669
1996
Ionov, D.A.Ionov, D.A., O'Reilly, S.Y., Genshaft, Y.S., Kopylova, M.Carbonate bearing mantle peridotite xenoliths from Spisbergen: phaserelationships, minerals compositionsContributions to Mineralogy and Petrology, Vol. 125, No. 4, pp. 375-392.NorwayXenoliths, Petrology
DS1997-0543
1997
Ionov, D.A.Ionov, D.A., Griffin, W.L., O'Reilly, S.Y.Volatile bearing minerals and lithophile trace elements in the uppermantle.Chemical Geol., Vol. 141, No. 3-4, Sept. 30, pp. 153-184.MantleGeochemistry, large-ion lithophile elements (LILE).
DS1998-0655
1998
Ionov, D.A.Ionov, D.A.Trace element composition of mantle derived carbonates and coexisting phases in peridotite xenoliths..Journal of Petrology, Vol. 39, No. 11-12, Nov-Dec. pp. 1931-41.GlobalCarbonatite, Alkali basalts
DS1998-0656
1998
Ionov, D.A.Ionov, D.A., Griffin, W.L., Reilly, S.Y.Garnet peridotite xenoliths in alkali basalts from Siberia and Mongolia: acomparison of lithospheric...7th International Kimberlite Conference Abstract, pp. 339-41.Russia, Siberia, Yakutia, Mongolia, BaikalCraton, mantle, xenoliths, Deposit - Udachnaya, VitiM.
DS1998-0927
1998
Ionov, D.A.Malkovets, V.G., Ionov, D.A., Griffin, W.L., O'ReillyA P-T composition cross section of spinel and garnet facies lithospheric mantle in the Minusa region.7th International Kimberlite Conference Abstract, pp. 543-5.Russia, SiberiaCraton -basanite, Deposit - Minusa region
DS1999-0325
1999
Ionov, D.A.Ionov, D.A., Gregoire, M., Prikhodko, V.S.Feldspar Ti Oxide metasomatism in off cratonic continental and oceanic upper mantle.Earth and Planetary Science Letters, Vol.165, No.1, Jan.15, pp.37-44.MantleMetasomatism
DS2002-0749
2002
Ionov, D.A.Ionov, D.A., Mukasa, S.B., Bodinier, J.L.Sr Nd Pb isotopic compositions of peridotite xenoliths from Spitsbergen: numericalJournal of Petrology, Vol. 43, 12, pp. 2261-78.Mantle, NorwayMetasomatism, Geochronology
DS200412-1508
2004
Ionov, D.A.Pearson, D.G., irvine, G.J., Ionov, D.A., Boyd, F.R., Dreibus, G.E.The Re Os systematics and platinum group element fractionation during mantle melt extraction: a study of massif and xenolith perChemical Geology, Vol. 208, 1-4, pp. 29-59.Africa, Lesotho, Namibia, MoroccoGeochronology, mantle melt extraction
DS200512-0462
2005
Ionov, D.A.Ionov, D.A., Ashchepkov, I., Jagoutz, E.The provenance of fertile off craton lithospheric mantle: Sr Nd isotope chemical composition of garnet and spinel peridotite xenoliths from Vitim, Siberia.Chemical Geology, Vol. 217, 1-2, April 15, pp. 41-75.Russia, SiberiaGeochronology
DS200512-0463
2005
Ionov, D.A.Ionov, D.A., Prikhodko, V.S., Bodinier, J-L.et.al.Lithospheric mantle beneath the south eastern Siberian Craton: petrology of peridotite xenoliths in basalts from the Tokinsky Stanovik.'Contributions to Mineralogy and Petrology, Online AccessRussiaXenoliths, Aldan Shield, Siberian Craton, metasomatism
DS200512-0464
2005
Ionov, D.A.Ionov, D.A.,Blichert Toft, J., Weiss, D.Hf isotope compositions and HREE variations in off craton garnet and spinel peridotite xenoliths from central Asia.Geochimica et Cosmochimica Acta, Vol. 69, 9, pp. 2399-2418.AsiaGeochemistry
DS200612-0621
2005
Ionov, D.A.Ionov, D.A., Chanefo, I., Bodinier, J.L.Origin of Fe rich lherzolites and wehrlites from Tok, SE Siberia by reactive melt percolation in refractory mantle peridotites.Contributions to Mineralogy and Petrology, Vol. 150, 3, pp. 335-353.RussiaLherzolite
DS200612-0622
2006
Ionov, D.A.Ionov, D.A., Chazot, G., Chauvel, C., Merlet, C., Bodinier, J.L.Trace element distribution in peridotite xenoliths from Tok, SE Siberian craton: a record of pervasive, multi stage metasomatism in shallow refractory mantle.Geochimica et Cosmochimica Acta, Vol. 70, 5, pp. 1231-1260.RussiaMetasomatism - Tok
DS200612-0623
2006
Ionov, D.A.Ionov, D.A., Hofmann, A.W., Merlet, C., Gurenko, A.A., Hellebrand, E., Montagnac, G., Gillet, P., PrikhodkoDiscovery of whitlockite in mantle xenoliths: inferences for water and halogen poor fluid and trace element residence in the terrestrial upper mantle.Earth and Planetary Science Letters, Vol. 244, 1-2, Apr. 15, pp. 201-207.MantleXenolith - mineralogy
DS200612-0624
2005
Ionov, D.A.Ionov, D.A., Shirey, S.B., Weis, D., Brugmann, G.Os Hf Nd isotope and PGE systematics of spinel peridotite xenoliths from Tok, SE Siberian craton: effects of pervasive metasomatism in shallow refractorEarth and Planetary Science Letters, Vol. 241, 1-2, pp. 47-64.Russia, SiberiaMetasomatism, xenoliths, Tokinsky
DS200612-1523
2006
Ionov, D.A.Weyer, S., Ionov, D.A., Hellebrand, E., Woodland, A.B., Brey, G.P.Iron isotope fractionation as indicator of mantle processes.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 16 abstract only.MantleGeochemistry - iron
DS200712-0464
2007
Ionov, D.A.Ionov, D.A., Hofmann, A.W.Depth of formation of subcontinental off-craton peridotites.Earth and Planetary Science Letters, Vol. 261, 3-4, pp. 620-634.MantlePeridotite
DS200712-1149
2007
Ionov, D.A.Weyer, S., Ionov, D.A.Partial melting and melt percolation in the mantle: the message from Fe isotopes.Earth and Planetary Science Letters, Vol. 259, 1-2, July 15, pp. 119-133.MantleMelting
DS200712-1150
2007
Ionov, D.A.Weyer, S., Ionov, D.A.Partial melting and melt percolation in the mantle: the message from Fe isotopes.Earth and Planetary Science Letters, Vol. 259, 1-2, pp. 119-133.MantleMelting
DS200712-1151
2007
Ionov, D.A.Weyer, S., Ionov, D.A.Partial melting and melt percolation in the mantle: the message from Fe isotopes.Earth and Planetary Science Letters, Vol. 259, 1-2, pp. 119-133.MantleMelting
DS200812-0501
2008
Ionov, D.A.Ionov, D.A., Seitz, H-M.Lithium abundances and isotopic compositions in mantle xenoliths from subduction and intra plate settings: mantle sources vs. eruption histories.Earth and Planetary Science Letters, Vol. 266, 3-4, pp. 316-331.RussiaVitim field
DS200812-0502
2008
Ionov, D.A.Ionov, D.A., Sobovlev, A.V.Geochemical fingerprinting of the lithospheric mantle using high precision olivine analyses.Goldschmidt Conference 2008, Abstract p.A410.MantleXenolith chemistry
DS200812-0699
2008
Ionov, D.A.Magna, T., Ionov, D.A., Oberli, F., Wiechert, U.Links between mantle metasomatism and lithium isotopes: evidence from glass bearing and cryptically metasomatized xenoliths from Mongolia.Earth and Planetary Science Letters, Vol. 276, 1-2, Nov. pp. 214-222.Asia, MongoliaMetasomatism
DS200812-1180
2008
Ionov, D.A.Tommasi, A., Vauchez, A., Ionov, D.A.Deformation, static recrystallization, and reactive melt transport in shallow subcontinental mantle xenoliths ( Tok Cenozoic volcanic field, SE Siberia).Earth and Planetary Science Letters, Vol. 272, 1-2, pp. 65-77.Russia, SiberiaXenoliths
DS200912-0185
2009
Ionov, D.A.Doucet, L.S., Ionov, D.A., Ashchepkov, I.New petrographic, major and trace element dat a on lithospheric mantle beneath central Siberian craton.Goldschmidt Conference 2009, p. A302 Abstract.RussiaDeposit - Udachnaya
DS201012-0309
2010
Ionov, D.A.Ionov, D.A., Doucet, L., Golovin, A., Ashchepkov, I.Can cratonic mantle be formed in subduction related settings?Goldschmidt 2010 abstracts, AbstractMantleSubduction
DS201012-0310
2010
Ionov, D.A.Ionov, D.A., Doucet, L.S., Ashchepkov, I.V.Composition of the lithospheric mantle in the Siberian craton: new constraints from fresh peridotites in the Udachnaya East kimberlite.Journal of Petrology, Vol. 51, 11, pp. 2177-2210.RussiaMantle petrology
DS201112-0036
2011
Ionov, D.A.Ashchepkov, I.V., Ionov, D.A., Ntaflos, T., Downes, H., Palessky, S.V.Origin of craton mantle layering according to PT reconstruction.Goldschmidt Conference 2011, abstract p.459.Russia, YakutiaKimberlite
DS201112-0063
2011
Ionov, D.A.Bascou, J., Doucet, L.S., Saumet, S., Ionov, D.A., Ashchepkov, I.V., Golovin, A.V.Seismic velocities, anisotropy and deformation in Siberian cratonic mantle: EBSD dat a on xenoliths from the Udachnaya kimberlite.Earth and Planetary Science Letters, Vol. 304, 1-2, pp. 71-84.RussiaDeposit - Udachnaya
DS201112-0080
2011
Ionov, D.A.Benard, A., Ionov, D.A., Shimizu, N., Plechov, P.Y.The volatile content of subduction zone melts and fluids.Goldschmidt Conference 2011, abstract p.513.Russia, KamchatkaHarzburgite xenoliths
DS201112-0287
2011
Ionov, D.A.Doucet, L.S., Ionov, D.A., Carlson, R.W., Golovin, A.V., Ashchepkov, I.V.Os isotope and PGE dat a on the age and evolution of lithospheric mantle in the central Siberian Craton.Goldschmidt Conference 2011, abstract p.777.RussiaUdachnaya kimberlite
DS201112-0380
2011
Ionov, D.A.Goncharov, A.G., Ionov, D.A., Doucet, L.S., Ashchepkov, I.V.Redox state of lithospheric mantle in central Siberian craton: a Mossbauer study of peridotite xenoliths from the Udachnaya kimberlite.Goldschmidt Conference 2011, abstract p.930.RussiaGeochronology
DS201112-0465
2011
Ionov, D.A.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
DS201212-0005
2012
Ionov, D.A.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
DS201212-0037
2012
Ionov, D.A.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
DS201212-0254
2012
Ionov, D.A.Goncharov, A.G., Ionov, D.A.Redox state of deep off-craton lithospheric mantle: new dat a from garnet and spinel peridotites from Vitim, southern Siberia.Contributions to Mineralogy and Petrology, in press available 18p.Russia, SiberiaMetasomatism
DS201212-0255
2012
Ionov, D.A.Goncharov, A.G., Ionov, D.A.Redox state of deep off-craton lithospheric mantle: new dat a from garnet and spinel peridotites from Vitim, southern Siberia.Contributions to Mineralogy and Petrology, Vol 164, pp. 731-745.RussiaXenoliths - redox
DS201212-0256
2012
Ionov, D.A.Goncharov, A.G., Ionov, D.A.Redox state of deep off-craton lithospheric mantle: new dat a from garnet and spinel peridotites from Vitim, southern Siberia.Mineralogy and Petrology, Vol. 164, 5, pp. 731-745.RussiaRedox
DS201212-0257
2012
Ionov, D.A.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
DS201312-0010
2013
Ionov, D.A.Agashev, A.M., Ionov, D.A., Pkhilenko, N.P., Golovin, A.V., Cherepanova, Yu., Sharygin, I.S.Metasomatism in lithospheric mantle roots: constraints from whole rock and mineral chemical composition of deformed peridotite xenoliths from kimberlite pipe Udachnaya.Lithos, Vol. 160-161, pp. 201-215.Mantle, Russia, SiberiaDeposit - Udachnaya
DS201312-0226
2013
Ionov, D.A.Doucet, L.S., Ionov, D.A., Golovin, A.V.The origin of coarse garnet peridotites in cratonic lithosphere: new dat a on xenoliths from the Udachnaya kimberlite, central Siberia.Contributions to Mineralogy and Petrology, Vol. 165, pp. 1225-1242.Russia, SiberiaDeposit - Udachnaya
DS201312-0266
2013
Ionov, D.A.Ferre, E.C., Friedman, S.A., Martin-Hernandez, F., Feinberg, J.M., Conder, J.A., Ionov, D.A.The magnetism of mantle xenoliths and potential implications for sub-Moho magnetic sources.Geophysical Research Letters, Vol. 40, 1, pp. 105-110.MantleMagnetism
DS201312-0429
2013
Ionov, D.A.Ionov, D.A., Doucet, L.S., Golovin, A.V.The origin of garnet peridotites in the Siberian cratonic mantle from chemical, modal and textural data.Goldschmidt 2013, AbstractRussia, SiberiaDeposit - Udachnaya
DS201412-0205
2014
Ionov, D.A.Doucet, L.S., Ionov, D.A., Golovin, A.V.Paleoproterozoic formation age for the Siberian cratonic mantle: Hf and Nd isotope dat a on refractory peridotite xenoliths from the Udachnaya kimberlite.Chemical Geology, Vol. 391, pp. 42-55.RussiaDeposit - Udachnaya
DS201412-0206
2014
Ionov, D.A.Doucet, L.S., Peslier, A.H., Ionov, D.A.High water contents in the Siberian cratonic mantle linked to metasomatism: an FTOR study of Udachnaya peridotite xenoliths.Geochimica et Cosmochimica Acta, Vol. 137, pp. 159-187.Russia, YakutiaDeposit - Udachnaya
DS201412-0208
2014
Ionov, D.A.Doucet, L.S., Peslier, A.H., Ionov, D.A., Brandon, A.D., Golovin, A.V., Goncharov, A.G., Ashchepkov, I.V.High water contents in the Siberian cratonic mantle linked to metasomatism: an FTIR study of Udachnaya peridotite xenoliths.Geochimica et Cosmochimica Acta, in press availableRussia, SiberiaDeposit - Udachnaya
DS201502-0088
2015
Ionov, D.A.Nimis, P., Goncharov, A., Ionov, D.A., McCammon, C.Fe3 partitioning systematics between orthopyroxene and garnet in mantle peridotite xenoliths and implications for thermobarometry of oxidized and reduced mantle rocks.Contributions to Mineralogy and Petrology, Vol. 169, 6p.MantlePeridotite
DS201509-0401
2015
Ionov, D.A.Ionov, D.A., Carlson, R.W., Doucet, L.S., Golovin, A.V., Oleinikov, O.B.The age and history of the lithospheric mantle of the Siberian craton: Re-Os and PGE study of peridotite xenoliths from the Obnazhennaya kimberlite.Earth and Planetary Science Letters, Vol. 428, pp. 108-119.Russia, SiberiaDeposit - Obnazhennaya

Abstract: The formation age of the lithospheric mantle of the Siberian craton (one of the largest on Earth) is not well established; nearly all published whole-rock Re–Os data are for mantle xenoliths from a single kimberlite in the center of the craton (Udachnaya). We report Re–Os isotope and PGE concentration data for 19 spinel and garnet peridotite xenoliths from the Obnazhennaya kimberlite in the northeastern portion of the craton. Most samples in this study, and many Obnazhennaya peridotites in general, show a combination of relatively low Al2O3 (0.1–2%) with high CaO (1.4–4%) concentrations. Only four dunites and harzburgites in our sample suite have low contents of both Al2O3 and CaO (0.1–0.8%), but their relatively low Mg# (0.888–0.919) and highly variable Os concentrations (0.6–35 ppb) suggest they may have formed in melt migration channels rather than as residues of partial melt extraction. A group of six Ca-rich (2.0–3.2% CaO) peridotites yields the highest Re–Os model ages (mean TRD = 2.8 Ga, mean TMA = 3.5 Ga). Eight peridotites with low to moderate Al2O3 (<2%) and Mg# =0.91, including three low-Ca harzburgites, yield lower Re–Os model ages (mean TRD = 1.9 Ga, mean TMA = 2.2 Ga). The remainder of the samples may not yield meaningful TRD ages because they are not refractory (Al2O3 >2.6% and/or Mg# =0.90). We interpret these results as evidence for a two-stage formation of the lithospheric mantle. The peridotites formed at the two stages show very similar chemical compositions. The enrichment in Ca, which we attribute to widespread post-melting metasomatism by carbonate-rich melts, may have taken place either at the end of the Archean melting event, when at least one Ca–Al-rich peridotite was formed, or later. The combined Re–Os age data on xenoliths from Obnazhennaya and Udachnaya suggest that the lithospheric mantle beneath the Siberian craton was not formed in a single event, but grew in at least two events, one in the late Archean and the other in the Paleoproterozoic. This study further indicates that the formation of highly melt-depleted lithospheric mantle was not limited to the Archean, but continued well into the Paleoproterozoic when the Siberian craton was stabilized.
DS201610-1859
2016
Ionov, D.A.Doucet, L.S., Mattielli, N., Ionov, D.A., Debouage, W., Golovin A.V.Zn isotopic heterogeneity in the mantle: a melting control?Earth and Planetary Science Letters, Vol. 451, pp. 232-240.MantlePeridotite

Abstract: We present new Zn elemental and isotope data on seventeen fertile and refractory mantle peridotite xenoliths. Eleven fertile peridotites are garnet and spinel lherzolites from Vitim and Tariat (Siberia and Mongolia) and represent some of the most pristine fertile peridotites available. Six refractory peridotites are spinel harzburgites from the Udachnaya kimberlite (Siberian craton) that are nearly pristine residues of high-degree polybaric melting at high pressure (7-4 GPa). Geochemical data suggest that Zn isotopic compositions in the peridotites have not been affected by post-melting processes such as metasomatism, contamination by the host-magmas or alteration. The fertile peridotites have uniform Zn concentrations (59±2 ppm59±2 ppm) and Zn isotopic compositions with d66Zn (relative to JMC-Lyon-03-0749l)?=?+0.30?±?0.03‰ consistent with the Bulk Silicate Earth estimates of d66Zn?=?+0.28?±?0.05‰ (Chen et al., 2013). The refractory peridotites have Zn concentrations ranging from 30 to 48 ppm and d66Zn from +0.10±0.01‰+0.10±0.01‰ to +0.18±0.01‰+0.18±0.01‰ with an average of +0.14±0.03‰+0.14±0.03‰. Our data suggest that the lithospheric mantle has a heterogeneous Zn isotopic composition. Modeling of Zn isotope partitioning during partial melting of fertile mantle suggests that high degrees of melt extraction (>30%) may significantly fractionate Zn isotopes (up to 0.16‰) and that during mantle melting, Zn concentrations and isotopic compositions are mainly controlled by the stability of clinopyroxene and garnet within the melting residue. Because the stability of clinopyroxene and garnet is mainly pressure dependent we suggest that both the depth and the degrees of melt extraction may control Zn isotope fractionation during mantle melting.
DS201610-1874
2016
Ionov, D.A.Jean, M.M., Taylor, L.A., Howarth, G.H., Peslier, A.H., Fedele, L., Bodnar, R.J., Guan, Y., Doucet, L.S., Ionov, D.A., Logvinova, A.M., Golovin, A.V., Sobolev, N.V.Olivine inclusions in Siberian diamonds and mantle xenoliths: contrasting water and trace -element contents.Lithos, in press available 11p.Russia, SiberiaDiamond inclusions
DS201704-0653
2017
Ionov, D.A.Xia, J., Qin, L., Shen, J., Carlson, R.W., Ionov, D.A., Mock, T.D.Chromium isotope heterogeneity in the mantle.Earth and Planetary Science Letters, Vol. 464, pp. 103-115.MantleGeochronology

Abstract: To better constrain the Cr isotopic composition of the silicate Earth and to investigate potential Cr isotopic fractionation during high temperature geological processes, we analyzed the Cr isotopic composition of different types of mantle xenoliths from diverse geologic settings: fertile to refractory off-craton spinel and garnet peridotites, pyroxenite veins, metasomatised spinel lherzolites and associated basalts from central Mongolia, spinel lherzolites and harzburgites from North China, as well as cratonic spinel and garnet peridotites from Siberia and southern Africa. The d53CrNIST 979 values of the peridotites range from -0.51±0.04‰-0.51±0.04‰ (2SD) to +0.75±0.05‰+0.75±0.05‰ (2SD). The results show a slight negative correlation between d53Cr and Al2O3 and CaO contents for most mantle peridotites, which may imply Cr isotopic fractionation during partial melting of mantle peridotites. However, highly variable Cr isotopic compositions measured in Mongolian peridotites cannot be caused by partial melting alone. Instead, the wide range in Cr isotopic composition of these samples most likely reflects kinetic fractionation during melt percolation. Chemical diffusion during melt percolation resulted in light Cr isotopes preferably entering into the melt. Two spinel websterite veins from Mongolia have extremely light d53Cr values of -1.36±0.04‰-1.36±0.04‰ and -0.77±0.06‰-0.77±0.06‰, respectively, which are the most negative Cr isotopic compositions yet reported for mantle-derived rocks. These two websterite veins may represent crystallization products from the isotopically light melt that may also metasomatize some peridotites in the area. The d53Cr values of highly altered garnet peridotites from southern Africa vary from -0.35±0.04‰-0.35±0.04‰ (2SD) to +0.12±0.04‰+0.12±0.04‰ (2SD) and increase with increasing LOI (Loss on Ignition), reflecting a shift of d53Cr to more positive values by secondary alteration.
DS201709-2036
2017
Ionov, D.A.Moyen, J-F., Paquette, J-L., Ionov, D.A., Korsakova, A.V., Golovina, A.V., Moine, B.N.Archean lithosphere: evidence from U-Pb zircon dating in crustal xenoliths at Udachanay, Siberian craton.Goldschmidt Conference, abstract 1p.Russiadeposit, Udachnaya

Abstract: Cratons represent the oldest preserved lithospheric domains. Their lithosphere (lithospheric mantle welded to overlying Precambrian crystalline basement) is considered to be particularly robust and long living due to the protecting presence of buoyant and rigid “keels” made up of residual harzburgites. In this study, we report new U—Pb zircon ages on crustal xenoliths from the Udachnaya kimberlite in the Siberian craton; this dataset includes samples from both the upper and lower portions of the crust. The zircon ages agree well with model melt-extraction Re-Os ages on refractory peridotite xenoliths from the same pipe; taken together they allow an integrated view of lithosphere formation. Our data reveal that the present day upper crust is Archaean, whereas both the lower crust and the lithospheric mantle yield Palaeoproterozoic ages. Consequently, the deep lithosphere beneath the Siberian craton was not formed in a single time, but grew in two distinct events, one in the late Archean and the other in the Palaeoproterozoic. We propose a two-stage scenario for the formation of the Siberian craton involving delamination and rejuvenation of the Archean lower lithosphere (lower crust and lithospheric mantle) in the Palaeoproterozoic. This demonstrates that craton formation can be a protracted, multi-stage process, and that the present day crust and mantle do not represent complementary reservoirs formed through the same episode.
DS201709-2037
2017
Ionov, D.A.Moyen, J-F., Paquette, J-L., Ionov, D.A., Korsakova, A.V., Golovina, A.V., Moine, B.N.Paleoproterozoic rejuvenation of an Archean lithosphere: evidence from U-Pb zircon dating in crustal xenoliths at Udachanaya, Siberian craton.Goldschmidt Conference, abstract 1p.Russia, Siberiadeposit, Udachnaya

Abstract: Cratons represent the oldest preserved lithospheric domains. Their lithosphere (lithospheric mantle welded to overlying Precambrian crystalline basement) is considered to be particularly robust and long-lived due to the protecting presence of buoyant and rigid “keels” made up of residual harzburgites. Although the cratons are mostly assumed to form in the Archaean, the timing of their formation remains poorly constrained. In particular, there are very few datasets describing concurrently the age of both the crustal and mantle portions of the lithosphere. In this study, we report new U–Pb ages and Hf isotope compositions for zircons in crustal xenoliths from the Udachnaya kimberlite in the central Siberian craton; this dataset includes samples from both the upper and lower portions of the crust. The zircon ages agree well with model melt-extraction Re–Os ages on refractory peridotite xenoliths from the same pipe; taken together they allow an integrated view of lithosphere formation. Our data reveal that the present day upper crust is Archaean, whereas both the lower crust and the lithospheric mantle yield Paleoproterozoic ages. We infer that the deep lithosphere beneath the Siberian craton was not formed in a single Archaean event, but grew in at least two distinct events, one in the late Archaean and the other in the Paleoproterozoic. Importantly, a complete or large-scale delamination and rejuvenation of the Archaean lower lithosphere (lower crust and lithospheric mantle) took place in the Paleoproterozoic. This further demonstrates that craton formation can be a protracted, multi-stage process, and that the present day crust and mantle may not represent complementary reservoirs formed through the same tectono-magmatic event. Further, deep cratonic lithosphere may be less robust and long living than often assumed, with rejuvenation and replacement events throughout its history.
DS201711-2521
2017
Ionov, D.A.Kang, J-T, Ionov, D.A., Liu, F., Zhang, C-L., Golovin, A.V., Qin, L-P., Zhang, Z-F., Huang, F.Calcium isotopic fractionation in mantle peridotites by melting and metasomatism and Ca isotope composition of the Bulk Silicate Earth.Earth and Planetary Science Letters, Vol. 474, pp. 128-137.Mantleperidotites

Abstract: To better constrain the Ca isotopic composition of the Bulk Silicate Earth (BSE) and explore the Ca isotope fractionation in the mantle, we determined the Ca isotopic composition of 28 peridotite xenoliths from Mongolia, southern Siberia and the Siberian craton. The samples are divided in three chemical groups: (1) fertile, unmetasomatized lherzolites (3.7-4.7 wt.% Al2O3); (2) moderately melt-depleted peridotites (1.3-3.0 wt.% Al2O3) with no or very limited metasomatism (LREE-depleted cpx); (3) strongly metasomatized peridotites (LREE-enriched cpx and bulk rock) further divided in subgroups 3a (harzburgites, 0.1-1.0% Al2O3) and 3b (fertile lherzolites, 3.9-4.3% Al2O3). In Group 1, d44/40Ca of fertile spinel and garnet peridotites, which experienced little or no melting and metasomatism, show a limited variation from 0.90 to 0.99‰ (relative to SRM 915a) and an average of 0.94 ± 0.05‰ (2SD, ), which defines the Ca isotopic composition of the BSE. In Group 2, the d44/40Ca is the highest for three rocks with the lowest Al2O3, i.e. the greatest melt extraction degrees (average ‰, i.e. ~0.1‰ heavier than the BSE estimate). Simple modeling of modal melting shows that partial melting of the BSE with ranging from 0.10 to 0.25 can explain the Group 2 data. By contrast, d44/40Ca in eight out of nine metasomatized Group 3 peridotites are lower than the BSE estimate. The Group 3a harzburgites show the greatest d44/40Ca variation range (0.25-0.96‰), with d44/40Ca positively correlated with CaO and negatively correlated with Ce/Eu. Chemical evidence suggests that the residual, melt-depleted, low-Ca protoliths of the Group 3a harzburgites were metasomatized, likely by carbonate-rich melts/fluids. We argue that such fluids may have low (=0.25‰) d44/40Ca either because they contain recycled crustal components or because Ca isotopes, similar to trace elements and their ratios, may be fractionated by kinetic and/or chromatographic effects of melt percolation in the mantle. The d44/40Ca in Group 3b lherzolites (0.83-0.89‰) are lower than in the BSE as well, but the effects of metasomatism on d44/40Ca are smaller, possibly because of the high Ca contents in their protoliths and/or smaller d44/40Ca differences between the protoliths and metasomatic agents. The BSE estimates based on fertile peridotites in this study fall in the d44/40Ca ranges for oceanic and continental basalts, various meteorites (achondrites; carbonaceous, ordinary and enstatite chondrites), Mars, and the Moon. These results provide benchmarks for the application of Ca isotopes to planet formation, mantle evolution, and crustal recycling.
DS201712-2693
2017
Ionov, D.A.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.
DS201801-0024
2017
Ionov, D.A.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.
DS201801-0039
2017
Ionov, D.A.Moyen, J-F., Paquette, J.L., Ionov, D.A., Gannoun, A., Korsakov, A.V., Golovin, A.V., Moine, B.N.Paleoproterozoic rejuvenation and replacement of Archean lithosphere: evidence from zircon U-Pb dating and Hf isotopes in crustal xenoliths at Udachnaya, Siberian craton.Earth and Planetary Science Letters, Vol. 458, 1, pp. 149-159.Russiadeposit - Udachnaya

Abstract: Cratons represent the oldest preserved lithospheric domains. Their lithosphere (lithospheric mantle welded to overlying Precambrian crystalline basement) is considered to be particularly robust and long-lived due to the protecting presence of buoyant and rigid “keels” made up of residual harzburgites. Although the cratons are mostly assumed to form in the Archaean, the timing of their formation remains poorly constrained. In particular, there are very few datasets describing concurrently the age of both the crustal and mantle portions of the lithosphere. In this study, we report new U-Pb ages and Hf isotope compositions for zircons in crustal xenoliths from the Udachnaya kimberlite in the central Siberian craton; this dataset includes samples from both the upper and lower portions of the crust. The zircon ages agree well with model melt-extraction Re-Os ages on refractory peridotite xenoliths from the same pipe; taken together they allow an integrated view of lithosphere formation. Our data reveal that the present day upper crust is Archaean, whereas both the lower crust and the lithospheric mantle yield Paleoproterozoic ages. We infer that the deep lithosphere beneath the Siberian craton was not formed in a single Archaean event, but grew in at least two distinct events, one in the late Archaean and the other in the Paleoproterozoic. Importantly, a complete or large-scale delamination and rejuvenation of the Archaean lower lithosphere (lower crust and lithospheric mantle) took place in the Paleoproterozoic. This further demonstrates that craton formation can be a protracted, multi-stage process, and that the present day crust and mantle may not represent complementary reservoirs formed through the same tectono-magmatic event. Further, deep cratonic lithosphere may be less robust and long living than often assumed, with rejuvenation and replacement events throughout its history.
DS201802-0242
2018
Ionov, D.A.Ionov, D.A., Doucet, L.S., Xu, Y., Golovin, A.V., Oleinikov, O.B.Reworking of Archean mantle in the NE Siberian craton by carbonatite and silicate melt metasomatism: evidence from a carbonate bearing, dunite to web sterite xenolith suite from the Obnazhennaya kimberlite.Geochimica et Cosmochimica Acta, in press available, 46p.Russia, Siberiadeposit - Obnazhennaya

Abstract: The Obnazhennaya kimberlite in the NE Siberian craton hosts a most unusual cratonic xenolith suite, with common rocks rich in pyroxenes and garnet, and no sheared peridotites. We report petrographic and chemical data for whole rocks (WR) and minerals of 20 spinel and garnet peridotites from Obnazhennaya with Re-depletion Os isotope ages of 1.8-2.9 Ga (Ionov et al., 2015a) as well as 2 pyroxenites. The garnet-bearing rocks equilibrated at 1.6-2.8 GPa and 710-1050°C. Some xenoliths contain vermicular spinel-pyroxene aggregates with REE patterns in clinopyroxene mimicking those of garnet. The peridotites show significant scatter of Mg# (0.888-0.924), Cr2O3 (0.2-1.4 wt.%) and high NiO (0.3-0.4 wt.%). None are pristine melting residues. Low-CaO-Al2O3 (=0.9 wt.%) dunites and harzburgites are melt-channel materials. Peridotites with low to moderate Al2O3 (0.4-1.8 wt.%) usually have CaO > Al2O3, and some have pockets of calcite texturally equilibrated with olivine and garnet. Such carbonates, exceptional in mantle xenoliths and reported here for the first time for the Siberian mantle, provide direct evidence for modal makeover and Ca and LREE enrichments by ephemeral carbonate-rich melts. Peridotites rich in CaO and Al2O3 (2.7-8.0 wt.%) formed by reaction with silicate melts. We infer that the mantle lithosphere beneath Obnazhennaya, initially formed in the Mesoarchean, has been profoundly modified. Pervasive inter-granular percolation of highly mobile and reactive carbonate-rich liquids may have reduced the strength of the mantle lithosphere leading the way for reworking by silicate melts. The latest events before the kimberlite eruption were the formation of the carbonate-phlogopite pockets, fine-grained pyroxenite veins and spinel-pyroxene symplectites. The reworked lithospheric sections are preserved at Obnazhennaya, but similar processes could erode lithospheric roots in the SE Siberian craton (Tok) and the North China craton, where ancient melting residues and reworked garnet-bearing peridotites are absent.The modal, chemical and Os-isotope compositions of the Obnazhennaya xenoliths produced by reaction of refractory peridotites with melts are very particular (high Ca/Al, no Mg#-Al correlations, highly variable Cr, low 187Os/188Os, continuous modal range from olivine-rich to low-olivine peridotites, wehrlites and websterites) and distinct from those of fertile lherzolites in off-craton xenoliths and peridotite massifs. These features argue against the concept of ‘refertilization’ of cratonic and other refractory peridotites by mantle-derived melts as a major mechanism to form fertile to moderately depleted lherzolites in continental lithosphere. The Obnazhennaya xenoliths represent a natural rock series produced by ‘refertilization’, but include no rocks equivalent in modal, major and trace element to the fertile lherzolites. This study shows that ‘refertilization’ yields broad, continuous ranges of modal and chemical compositions with common wehrlites and websterites that are rare among off-craton xenoliths.
DS201808-1775
2017
Ionov, D.A.Paquette, J.L., Ionov, D.A., Agashev, A.M., Gannoun, A., Nikolenko, E.I.Age, provenance and Precambrian evolution of the Anabar shield from U Pb and Lu Hf isotope dat a on detrital zircons, and the history of the northern and central Siberian craton.Precambrian Research, Vol. 301, pp. 134-144.Russiacraton

Abstract: The Anabar shield in northern Siberia is one of the world’s least studied Precambrian areas, and provides a ‘window’ into the crustal basement of the central and northern Siberian craton. We report U-Pb and Hf isotope data for detrital zircons sampled in a profile across its major structural units. They define a U-Pb age range from 1.8 to 3.4 Ga with three main periods: 1.8-2.0 Ga, 2.4-2.8 Ga and 3.0-3.4 Ga. The oldest zircons yield super-chondritic eHf(t) implying that the parental magmas of their source rocks were juvenile, i.e. formed from depleted mantle (DM). Thus, the crustal basement of the Anabar shield, and probably the whole central and northern Siberian craton, started to form in the mid-Paleoarchean, and included no recycled crust. Zircons with 2.5-2.7 Ga ages define two eHf(t) intervals. One is super-chondritic (+2 to +7) implying juvenile sources, the other is sub-chondritic (-3 to -12) indicative of recycled crust, probably formed at 3.2-3.4 Ga, in magma sources. Nearly all 1.8-2.0 Ga zircons have sub-chondritic eHf(t) (-2 to -29) implying derivation from sources dominated by recycled crust formed at ~2.6 Ga and ~3.4 Ga and little or no juvenile addition. These events accompanied amalgamation of the entire craton by welding of Archean domains. The Bekelekh unit of the Daldyn series has the highest proportion of ~2.6 Ga zircons and may be the oldest ‘nucleus’ of the Anabar shield, whereas the Kilegur unit of the same series is essentially Proterozoic (1.95 Ga). The largest amount of 3.1-3.4 Ga zircons, as well as common 2.6-2.7 Ga zircons, occur in the Ambardakh unit of the Upper Anabar series. Our data suggest alternation of areas with dominant ages of 1.95 Ga and ~2.6 Ga, with the younger zircons coming from granites and granulites, and the older ones from gneisses. They show no evidence for significant ages differences for the Anabar and Olenek provinces. The final amalgamation of the entire Siberian craton by welding of Archean blocks, may have taken place at around 1954 ± 6 Ma.
DS201810-2392
2018
Ionov, D.A.Zhang, S.Y., Zhang, H.L., Hou, Z., Ionov, D.A., Huang, F.Rapid determination of trace element compositions in peridotites by LA-ICP-MS using an albite fusion method.Geostandards and Geoanalytical Research, doi:10.111/ggr.12240Globalperidotite

Abstract: A rapid sample preparation procedure is described to determine trace element compositions of peridotites using LA-ICP-MS. Peridotite powders were fused with albite in a molybdenum-graphite assembly to obtain homogeneous glasses. Best conditions for the fusion procedure (heating at 1500 to 1550 °C for 10 to 15 min with a sample-to-flux ratio of 1:2) were constrained with melting experiments on two USGS reference materials, PCC-1 and DTS-2B. Mass fractions of first series transition elements, Ba and Pb in quenched glasses of PCC-1 and DTS-2B are consistent with published data within 10% RSD. Three spinel peridotite xenoliths from eastern China were analysed following both our method and conventional solution ICP-MS. Compared with solution ICP-MS, the relative deviations of our method for most elements were within 10%, while for the REE, Ta, Pb, Th and U, were within 20%. In particular, volatile elements (e.g., Pb and Zn) are retained in the glass. Compared with conventional wet chemistry digestion, our method is faster. Additional advantages are complete sample fusion, especially useful for samples with acid-resistant minerals (spinel, rutile), and long-term conservation of glasses allowing unlimited repeated measurements with micro-beam techniques. The same approach can be used for analyses of other mantle rocks, such as eclogites and pyroxenites.
DS201812-2779
2018
Ionov, D.A.Benard, A., Klimm, K., Woodland, A.B., Arculus, R.J., Wilke, M., Botcharnikov, R.E., Shimizu, N., Nebel, O., Rivard, C., Ionov, D.A.Oxidising agents in sub-arc mantle melts link slab devolatillisation and arc magmas.Nature Communications, Vol. 9, 1, doi: 10.1038/s41467-018-05804-2 11p.Mantlemelting

Abstract: Subduction zone magmas are more oxidised on eruption than those at mid-ocean ridges. This is attributed either to oxidising components, derived from subducted lithosphere (slab) and added to the mantle wedge, or to oxidation processes occurring during magma ascent via differentiation. Here we provide direct evidence for contributions of oxidising slab agents to melts trapped in the sub-arc mantle. Measurements of sulfur (S) valence state in sub-arc mantle peridotites identify sulfate, both as crystalline anhydrite (CaSO4) and dissolved SO42- in spinel-hosted glass (formerly melt) inclusions. Copper-rich sulfide precipitates in the inclusions and increased Fe3+/?Fe in spinel record a S6+Fe2+ redox coupling during melt percolation through the sub-arc mantle. Sulfate-rich glass inclusions exhibit high U/Th, Pb/Ce, Sr/Nd and d34S (+?7 to +?11‰), indicating the involvement of dehydration products of serpentinised slab rocks in their parental melt sources. These observations provide a link between liberated slab components and oxidised arc magmas.
DS201902-0279
2018
Ionov, D.A.Ionov, D.A., Doucet, L.S., Xu, Y., Golovin, A.V., Oleinikov, O.B.Reworking of Archean mantle in the NE Siberian craton by carbonatite and silicate melt metasomatism: evidence from a carbonate bearing, dunite to websterite xenolith suite from the Obnazhennaya kimberlite.Geochimica et Cosmochimica Acta, Vol. 224, pp. 132-153.Russia, Siberiadeposit - Obnazhennaya

Abstract: The Obnazhennaya kimberlite in the NE Siberian craton hosts a most unusual cratonic xenolith suite, with common rocks rich in pyroxenes and garnet, and no sheared peridotites. We report petrographic and chemical data for whole rocks (WR) and minerals of 20 spinel and garnet peridotites from Obnazhennaya with Re-depletion Os isotope ages of 1.8-2.9?Ga (Ionov et al., 2015a) as well as 2 pyroxenites. The garnet-bearing rocks equilibrated at 1.6-2.8?GPa and 710-1050?°C. Some xenoliths contain vermicular spinel-pyroxene aggregates with REE patterns in clinopyroxene mimicking those of garnet. The peridotites show significant scatter of Mg# (0.888-0.924), Cr2O3 (0.2-1.4?wt.%) and high NiO (0.3-0.4?wt.%). None are pristine melting residues. Low-CaO-Al2O3 (=0.9?wt.%) dunites and harzburgites are melt-channel materials. Peridotites with low to moderate Al2O3 (0.4-1.8?wt.%) usually have CaO?>?Al2O3, and some have pockets of calcite texturally equilibrated with olivine and garnet. Such carbonates, exceptional in mantle xenoliths and reported here for the first time for the Siberian mantle, provide direct evidence for modal makeover and Ca and LREE enrichments by ephemeral carbonate-rich melts. Peridotites rich in CaO and Al2O3 (2.7-8.0?wt.%) formed by reaction with silicate melts. We infer that the mantle lithosphere beneath Obnazhennaya, initially formed in the Mesoarchean, has been profoundly modified. Pervasive inter-granular percolation of highly mobile and reactive carbonate-rich liquids may have reduced the strength of the mantle lithosphere leading the way for reworking by silicate melts. The latest events before the kimberlite eruption were the formation of the carbonate-phlogopite pockets, fine-grained pyroxenite veins and spinel-pyroxene symplectites. The reworked lithospheric sections are preserved at Obnazhennaya, but similar processes could erode lithospheric roots in the SE Siberian craton (Tok) and the North China craton, where ancient melting residues and reworked garnet-bearing peridotites are absent. The modal, chemical and Os-isotope compositions of the Obnazhennaya xenoliths produced by reaction of refractory peridotites with melts are very particular (high Ca/Al, no Mg#-Al correlations, highly variable Cr, low 187Os/188Os, continuous modal range from olivine-rich to low-olivine peridotites, wehrlites and websterites) and distinct from those of fertile lherzolites in off-craton xenoliths and peridotite massifs. These features argue against the concept of ‘refertilization’ of cratonic and other refractory peridotites by mantle-derived melts as a major mechanism to form fertile to moderately depleted lherzolites in continental lithosphere. The Obnazhennaya xenoliths represent a natural rock series produced by ‘refertilization’, but include no rocks equivalent in modal, major and trace element to the fertile lherzolites. This study shows that ‘refertilization’ yields broad, continuous ranges of modal and chemical compositions with common wehrlites and websterites that are rare among off-craton xenoliths.
DS201902-0280
2019
Ionov, D.A.Ionov, D.A., Qi, Y-H., Kang, J-T., Golovin, A.V., Oleinikov, O.B., Zheng, W., Anbar, A.D., Zhang, Z-F., Huang, F.Calcium isotopic signatures of carbonatite and silicate metasomatism, melt percolation and crustal recycling in the lithospheric mantle.Geochimica et Cosmochimica Acta, Vol. 248, pp. 1-13.Russia, Siberiacarbonatite

Abstract: Ca isotopes can be strongly fractionated at the Earth’s surface and thus may be tracers of subducted carbonates and other Ca-rich surface materials in mantle rocks, magmas and fluids. However, the d44/40Ca range in the mantle and the scope of intra-mantle isotope fractionation are poorly constrained. We report Ca isotope analyses for 22 mantle xenoliths: four basalt-hosted refractory peridotites from Tariat in Mongolia and 18 samples from the Obnazhennaya (Obn) kimberlite on the NE Siberian craton. Obn peridotites are Paleoproterozoic to Archean melting residues metasomatised by carbonate-rich and/or silicate melts including unique xenoliths that contain texturally equilibrated carbonates. d44/40Ca in 15 Obn xenoliths shows limited variation (0.74-0.97‰) that overlaps the value (0.94?±?0.05‰) inferred for the bulk silicate Earth from data on fertile lherzolites, but is lower than d44/40Ca for non-metasomatised refractory peridotites from Mongolia (1.10?±?0.03‰). Bulk d44/40Ca in four Obn peridotites containing metasomatic carbonates ranges from 0.81?±?0.08‰ to 0.83?±?0.06‰, with similar values in acid-leachates and leaching residues, indicating isotopic equilibration of the carbonates with host rocks. We infer that (a) metasomatism tends to decrease d44/40Ca values of the mantle, but its effects are usually limited (=0.3‰); (b) Ca isotopes cannot distinguish "carbonatite" and "silicate" types of mantle metasomatism. The lowest d44/40Ca value (0.56‰) was obtained for a phlogopite-bearing Obn peridotite with a very high Ca/Al of 8 suggesting that the greatest metasomatism-induced Ca isotope shifts may be seen in rocks initially low in Ca that experienced significant Ca input leading to high Ca/Al. Two Obn peridotites, a dunite (melt channel material) and a veined spinel wehrlite, have high d44/40Ca values (1.22‰ and 1.38‰), which may be due to isotope fractionation by diffusion during silicate melt intrusion and percolation in the host mantle. Overall, we find no evidence that recycling of crustal carbonates may greatly affect Ca isotope values in the global mantle or on a regional scale.
DS201903-0519
2018
Ionov, D.A.Ionov, D.A., Qi, Y-H., Kang, J-T., Golovin, A.V., Oleinikov, O.B., Zheng, W., Anbar, A.D., Zhang, Z-F., Huang, F.Calcium isotopic signatures of carbonatite and silicate metasomatism, melt percolation and crustal recyclying in the lithospheric mantle.Geochimica et Cosmochimica Acta, Vol. 248, pp. 1-13.Mantlecarbonatite

Abstract: Ca isotopes can be strongly fractionated at the Earth’s surface and thus may be tracers of subducted carbonates and other Ca-rich surface materials in mantle rocks, magmas and fluids. However, the d44/40Ca range in the mantle and the scope of intra-mantle isotope fractionation are poorly constrained. We report Ca isotope analyses for 22 mantle xenoliths: four basalt-hosted refractory peridotites from Tariat in Mongolia and 18 samples from the Obnazhennaya (Obn) kimberlite on the NE Siberian craton. Obn peridotites are Paleoproterozoic to Archean melting residues metasomatised by carbonate-rich and/or silicate melts including unique xenoliths that contain texturally equilibrated carbonates. d44/40Ca in 15 Obn xenoliths shows limited variation (0.74-0.97‰) that overlaps the value (0.94?±?0.05‰) inferred for the bulk silicate Earth from data on fertile lherzolites, but is lower than d44/40Ca for non-metasomatised refractory peridotites from Mongolia (1.10?±?0.03‰). Bulk d44/40Ca in four Obn peridotites containing metasomatic carbonates ranges from 0.81?±?0.08‰ to 0.83?±?0.06‰, with similar values in acid-leachates and leaching residues, indicating isotopic equilibration of the carbonates with host rocks. We infer that (a) metasomatism tends to decrease d44/40Ca values of the mantle, but its effects are usually limited (=0.3‰); (b) Ca isotopes cannot distinguish "carbonatite" and "silicate" types of mantle metasomatism. The lowest d44/40Ca value (0.56‰) was obtained for a phlogopite-bearing Obn peridotite with a very high Ca/Al of 8 suggesting that the greatest metasomatism-induced Ca isotope shifts may be seen in rocks initially low in Ca that experienced significant Ca input leading to high Ca/Al. Two Obn peridotites, a dunite (melt channel material) and a veined spinel wehrlite, have high d44/40Ca values (1.22‰ and 1.38‰), which may be due to isotope fractionation by diffusion during silicate melt intrusion and percolation in the host mantle. Overall, we find no evidence that recycling of crustal carbonates may greatly affect Ca isotope values in the global mantle or on a regional scale.
DS201904-0749
2019
Ionov, D.A.Ionov, D.A., Qi, YpH., Kang, J-T., Golovin, A.V., Oleinkov, O.B., Zheng, W., Anbar, A.D., Zhang, Z-F., Huang, F.Calcium isotopic signatures of carbonatite and silicate metasomatism, melt percolation and crustal recycling in the lithospheric mantle.Geochimica et Cosmochimica Acta, Vol. 248, pp. 1-13.Mantle, Asia, Mongolia, Russia, Siberiametasomatism

Abstract: Ca isotopes can be strongly fractionated at the Earth’s surface and thus may be tracers of subducted carbonates and other Ca-rich surface materials in mantle rocks, magmas and fluids. However, the d44/40Ca range in the mantle and the scope of intra-mantle isotope fractionation are poorly constrained. We report Ca isotope analyses for 22 mantle xenoliths: four basalt-hosted refractory peridotites from Tariat in Mongolia and 18 samples from the Obnazhennaya (Obn) kimberlite on the NE Siberian craton. Obn peridotites are Paleoproterozoic to Archean melting residues metasomatised by carbonate-rich and/or silicate melts including unique xenoliths that contain texturally equilibrated carbonates. d44/40Ca in 15 Obn xenoliths shows limited variation (0.74-0.97‰) that overlaps the value (0.94?±?0.05‰) inferred for the bulk silicate Earth from data on fertile lherzolites, but is lower than d44/40Ca for non-metasomatised refractory peridotites from Mongolia (1.10?±?0.03‰). Bulk d44/40Ca in four Obn peridotites containing metasomatic carbonates ranges from 0.81?±?0.08‰ to 0.83?±?0.06‰, with similar values in acid-leachates and leaching residues, indicating isotopic equilibration of the carbonates with host rocks. We infer that (a) metasomatism tends to decrease d44/40Ca values of the mantle, but its effects are usually limited (=0.3‰); (b) Ca isotopes cannot distinguish “carbonatite” and “silicate” types of mantle metasomatism. The lowest d44/40Ca value (0.56‰) was obtained for a phlogopite-bearing Obn peridotite with a very high Ca/Al of 8 suggesting that the greatest metasomatism-induced Ca isotope shifts may be seen in rocks initially low in Ca that experienced significant Ca input leading to high Ca/Al. Two Obn peridotites, a dunite (melt channel material) and a veined spinel wehrlite, have high d44/40Ca values (1.22‰ and 1.38‰), which may be due to isotope fractionation by diffusion during silicate melt intrusion and percolation in the host mantle. Overall, we find no evidence that recycling of crustal carbonates may greatly affect Ca isotope values in the global mantle or on a regional scale.
DS201907-1527
2019
Ionov, D.A.Batanova, V.G., Thompson, J.M., Danyushevsky, L.V., Portnyagin, M.V., Garbe-Schonberg, D., Hauri, E., Kimura, J-I., Chang, Q., Senda, R., Goemann, K., Chauvel, C., Campillo, S., Ionov, D.A., Sobolev,A.V.New olivine reference material for in situ microanalysis.Geostandards and Geoanalytical Research, in press available, 21p.Asia, Mongoliaolivine

Abstract: A new olivine reference material - MongOL Sh11-2 - for in situ analysis has been prepared from the central portion of a large (20 × 20 × 10 cm) mantle peridotite xenolith from a ~ 0.5 My old basaltic breccia at Shavaryn-Tsaram, Tariat region, central Mongolia. The xenolith is a fertile mantle lherzolite with minimal signs of alteration. Approximately 10 g of 0.5-2 mm gem quality olivine fragments were separated under binocular microscope and analysed by EPMA, LA-ICP-MS, SIMS and bulk analytical methods (ID-ICP-MS for Mg and Fe, XRF, ICP-MS) for major, minor and trace elements at six institutions world-wide. The results show that the olivine fragments are sufficiently homogeneous with respect to major (Mg, Fe, Si), minor and trace elements. Significant inhomogeneity was revealed only for phosphorus (homogeneity index of 12.4), whereas Li, Na, Al, Sc, Ti and Cr show minor inhomogeneity (homogeneity index of 1-2). The presence of some mineral and fluid-melt micro-inclusions may be responsible for the inconsistency in mass fractions obtained by in situ and bulk analytical methods for Al, Cu, Sr, Zr, Ga, Dy and Ho. Here we report reference and information values for twenty-seven major, minor and trace elements.
DS202001-0020
2020
Ionov, D.A.Ionov, D.A., Guo, P., Nelson, W.R., Shirey, S.B., Willbold, M.Paleoproterozoic melt depleted lithospheric mantle in the Khanka block, far eastern Russia: inferences for mobile belts bordering the North China and Siberian cratons.Geochimica et Cosmochimica Acta, Vol. 270, pp. 95-111.China, Russiametasomatism, melting

Abstract: The eastern part of Asia between the North China and Siberian cratons contains orogenic belts formed by the Paleo-Asian and Pacific subduction and older continental blocks. A fundamental question regarding these and all mobile belts is the fate of the continental lithospheric mantle (CLM) during their formation, i.e. whether, or to what extent the CLM may be formed, replaced or affected during orogeny. Insights into these processes can be obtained from mantle xenoliths hosted by Cenozoic basalts in the Proterozoic Khanka block in the far eastern Russia between NE China and the Pacific coast of Asia. We report petrographic, chemical, and Os-Sr-Nd isotope data for spinel peridotite xenoliths at two Khanka sites: Sviyagin and Podgelban. The modal abundances and chemical compositions suggest that the peridotites are residues of low to moderate degrees of melt extraction from fertile mantle. They show an 187Os/188Os vs. 187Re/188Os correlation with an apparent 1.9?Ga age; the 187Os/188Os ratios are positively correlated with Al2O3 and other melt extraction indices. These results provide the first robust CLM age constraints for the eastern Central Asian Orogenic Belt (CAOB). The ages suggest that the ancient CLM of the Khanka block may be roughly coeval with reworked CLM at Hannuoba (North China craton), and that it persisted through the Phanerozoic orogenies. Moreover, despite the proximity to Phanerozoic subduction zones, the Khanka CLM shows little post-melting enrichment, e.g. the clinopyroxenes are typically LREE-depleted and have Sr-Nd isotope ratios typical of the MORB mantle. We posit that the metasomatism of the CLM, earlier proposed for North China xenolith suites and ascribed to the effects of Pacific or older subduction and related mantle upwelling, may not be widespread in the CAOB. In general, Proterozoic blocks composed of residual peridotites may be more common in the CLM of the SE Siberia and northern China, and possibly other orogenic belts, than previously thought.
DS202002-0194
2020
Ionov, D.A.Ionov, D.A., Guo, P., Nelson, W.R., Shirey, S.B., Willbold, M.Paleoproterozoic melt depleted lithospheric mantle in the Khanka block, far eastern Russia: inferences for mobile belts bordering the North China and Siberian cratons.Geochimica et Cosmochimica Acta, Vol. 270, pp. 95-111.Russiaperidotites

Abstract: The eastern part of Asia between the North China and Siberian cratons contains orogenic belts formed by the Paleo-Asian and Pacific subduction and older continental blocks. A fundamental question regarding these and all mobile belts is the fate of the continental lithospheric mantle (CLM) during their formation, i.e. whether, or to what extent the CLM may be formed, replaced or affected during orogeny. Insights into these processes can be obtained from mantle xenoliths hosted by Cenozoic basalts in the Proterozoic Khanka block in the far eastern Russia between NE China and the Pacific coast of Asia. We report petrographic, chemical, and Os-Sr-Nd isotope data for spinel peridotite xenoliths at two Khanka sites: Sviyagin and Podgelban. The modal abundances and chemical compositions suggest that the peridotites are residues of low to moderate degrees of melt extraction from fertile mantle. They show an 187Os/188Os vs. 187Re/188Os correlation with an apparent 1.9?Ga age; the 187Os/188Os ratios are positively correlated with Al2O3 and other melt extraction indices. These results provide the first robust CLM age constraints for the eastern Central Asian Orogenic Belt (CAOB). The ages suggest that the ancient CLM of the Khanka block may be roughly coeval with reworked CLM at Hannuoba (North China craton), and that it persisted through the Phanerozoic orogenies. Moreover, despite the proximity to Phanerozoic subduction zones, the Khanka CLM shows little post-melting enrichment, e.g. the clinopyroxenes are typically LREE-depleted and have Sr-Nd isotope ratios typical of the MORB mantle. We posit that the metasomatism of the CLM, earlier proposed for North China xenolith suites and ascribed to the effects of Pacific or older subduction and related mantle upwelling, may not be widespread in the CAOB. In general, Proterozoic blocks composed of residual peridotites may be more common in the CLM of the SE Siberia and northern China, and possibly other orogenic belts, than previously thought.
DS202002-0195
2020
Ionov, D.A.Klaver, M., Ionov, D.A., Takazawa, E., Elliott, T.The non-chondritic Ni isotope composition of Earth's mantle.Geochimica et Cosmochimica Acta, Vol. 268, pp. 405-421.Mantleperidotites

Abstract: Nickel is a major element in the Earth. Due to its siderophile nature, 93% of Ni is hosted in the core and the Ni isotope composition of the bulk silicate Earth might inform on the conditions of terrestrial core formation. Whether Earth’s mantle is fractionated relative to the chondritic reservoir, and by inference to the core, is a matter of debate that largely arises from the uncertain Ni isotope composition of the mantle. We address this issue through high-precision Ni isotope measurements of fertile- to melt-depleted peridotites and compare these data to chondritic meteorites. Terrestrial peridotites that are free from metasomatic overprint display a limited range in d60/58Ni (deviation of 60Ni/58Ni relative to NIST SRM 986) and no systematic variation with degree of melt depletion. The latter is consistent with olivine and orthopyroxene buffering the Ni budget and isotope composition of the refractory peridotites. As such, the average Ni isotope composition of these peridotites (d60/58Ni = 0.115 ± 0.011‰) provides a robust estimate of the d60/58Ni of the bulk silicate Earth. Peridotites with evidence for melt metasomatism range to heavier Ni isotope compositions where the introduction of clinopyroxene appears to drive an increase in d60/58Ni. This requires a process where melts do not reach isotopic equilibrium with buffering olivine and orthopyroxene, but its exact nature remains obscure. Chondritic meteorites have variability in d60/58Ni due to heterogeneity at the sampling scale. In particular, CI1 chondrites are displaced to isotopically lighter values due to sorption of Ni onto ferrihydrite during parent body alteration. Chondrites less extensively altered than the CI1 chondrites show no systematic differences in d60/58Ni between classes and yield average d60/58Ni = 0.212 ± 0.013‰, which is isotopically heavier than our estimate of the bulk silicate Earth. The notable isotopic difference between the bulk silicate Earth and chondrites likely results from the segregation of the terrestrial core. Our observations potentially provide a novel constraint on the conditions of terrestrial core formation but requires further experimental calibration.
DS202007-1136
2020
Ionov, D.A.Doucet, L.S., Xu, Y., Klaessens, D., Hui, H., Ionov, D.A., Mattielli, N.Decoupled water and iron enrichments in the cratonic mantle: a study on peridotite xenoliths from Tok, SE Siberian craton.American Mineralogist, Vol. 105, pp. 803-819.Russia, Siberia peridotites

Abstract: Water and iron are believed to be key constituents controlling the strength and density of the lithosphere and, therefore, play a crucial role in the long-term stability of cratons. On the other hand, metasomatism can modify the water and iron abundances in the mantle and possibly triggers thermo-mechanical erosion of cratonic keels. Whether local or large scale processes control water distribution in cratonic mantle remains unclear, calling for further investigation. Spinel peridotite xenoliths in alkali basalts of the Cenozoic Tok volcanic field sampled the lithospheric mantle beneath the southeastern margin of the Siberian Craton. The absence of garnet-bearing peridotite among the xenoliths, together with voluminous eruptions of basaltic magma, suggests that the craton margin, in contrast to the central part, lost its deep keel. The Tok peridotites experienced extensive and complex metasomatic reworking by evolved, Ca-Fe-rich liquids that transformed refractory harzburgite to lherzolite and wehrlite. We used polarized Fourier transform infrared spectroscopy (FTIR) to obtain water content in olivine, orthopyroxene (Opx), and clinopyroxene (Cpx) of 14 Tok xenoliths. Olivine, with a water content of 0-3 ppm H2O, was severely degassed, probably during emplacement and cooling of the host lava flow. Orthopyroxene (49-106 ppm H2O) and clinopyroxene (97-300 ppm H2O) are in equilibrium. The cores of the pyroxene grains, unlike olivine, experienced no water loss due to dehydration or addition attributable to interaction with the host magma. The water contents of Opx and Cpx are similar to those from the Kaapvaal, Tanzania, and North China cratons, but the Tok Opx has less water than previously studied Opx from the central Siberian craton (Udachnaya, 28-301 ppm; average 138 ppm). Melting models suggest that the water contents of Tok peridotites are higher than in melting residues, and argue for a post-melting (metasomatic) origin. Moreover, the water contents in Opx and Cpx of Tok peridotites are decoupled from iron enrichments or other indicators of melt metasomatism (e.g., CaO and P2O5). Such decoupling is not seen in the Udachnaya and Kaapvaal peridotites but is similar to observations on Tanzanian peridotites. Our data suggest that iron enrichments in the southeastern Siberian craton mantle preceded water enrichment. Pervasive and large-scale, iron enrichment in the lithospheric mantle may strongly increase its density and initiate a thermo-magmatic erosion. By contrast, the distribution of water in xenoliths is relatively “recent” and was controlled by local metasomatic processes that operate shortly before the volcanic eruption. Hence, water abundances in minerals of Tok mantle xenoliths appear to represent a snapshot of water in the vicinity of the xenolith source regions.
DS202007-1150
2020
Ionov, D.A.Ionov, D.A., Liu, Z., Li, J., Golovin, A.V., Korsakov, A.V., Xu, Y.The age and origin of cratonic lithospheric mantle: Archean dunites vs paleoproterozoic harzburgites from the Udachnaya kimberlite, Siberian craton.Geochimica et Cosmochimica Acta, Vol. 281, pp. 67-90. pdfRussia, Siberiadeposit - Udachnaya

Abstract: Cratonic lithospheric mantle is believed to have been formed in the Archean, but kimberlite-hosted coarse peridotites from Udachnaya in the central Siberian craton typically yield Paleoproterozoic Re-depletion Os isotope ages (TRD). By comparison, olivine megacrysts from Udachnaya, sometimes called “megacrystalline peridotites”, often yield Archean TRD ages, but the nature of these rare materials remains enigmatic. We provide whole-rock (WR) Re-Os isotope and PGE analyses for 24 olivine-rich xenoliths from Udachnaya as well as modal and petrographic data, WR and mineral major and trace element compositions. The samples were selected based on (a) high olivine abundances in hand specimens and (b) sufficient freshness and size to yield representative WR powders. They comprise medium- to coarse-grained (olivine??1?cm) dunite, olivine megacrysts and low-orthopyroxene (11-21% opx) harzburgites equilibrated at 783-1154?°C and 3.9-6.5 GPa; coarse dunites have not been previously reported from Udachnaya; two xenoliths contain ilmenite. The harzburgites and dunites have similar WR variation ranges of Ca, Al, Fe, Cr and Mg# (0.917-0.934) typical of refractory cratonic peridotites, but the dunites tend to have higher MgO, NiO and Mg/Si. Mineral abundances and those of Ca and Al are not correlated with Mg#WR; they are not due to differences in melting degrees but are linked to metasomatism. Several samples with high 187Re/188Os show a positive linear correlation with 187Os/188Os with an apparent age of 0.37?Ga, same as eruption age of host kimberlite. Robust TRD ages were obtained for 16 xenoliths with low 187Re/188Os (0.02-0.13). TRD ages for low-opx harzburgites (1.9-2.1?Ga; average 2.0?±?0.1?Ga, 1 s) are manifestly lower than for dunites and megacrysts (2.4-3.1?Ga); the latter define two subsets with average TRD of 2.6?±?0.1?Ga and 3.0?±?0.1?Ga, and TMA of 3.0?±?0.2?Ga and 3.3?±?0.1?Ga, respectively. Differences in olivine grain size (coarse vs. megacrystalline) are not related to age. The age relations suggest that the dunites and megacrysts could not be produced by re-melting of harzburgites, e.g. in arc settings, nor be melt channel materials in harzburgites. Instead, they are relict fragments of lithospheric mantle formed in the Archean (likely in two events at or after 2.6?Ga and 3.0?Ga) that were incorporated into cratonic lithosphere during the final assembly of the Siberian craton in the Paleoproterozoic. A multi-stage formation of the Siberian lithospheric mantle is consistent with crustal basement ages from U-Pb dating of zircons from crustal xenoliths at Udachnaya and detrital zircons from the northern Siberian craton (1.8-2.0, 2.4-2.8 and 3.0-3.4?Ga). The new data from the Siberian and other cratons suggest that the formation of strongly melt-depleted cratonic lithosphere (e.g. Mg# =0.92) did not stop at the Archean-Proterozoic boundary as is commonly thought, but continued in the Paleoproterozoic. The same may be valid for the transition from the ‘Archean’ (4-2.5?Ga) to modern tectonic regimes.
DS202009-1641
2020
Ionov, D.A.Moine, B.N., Bolfan-Casanova, N., Radu, I.B., Ionov, D.A., Costin, G., Korsakov, A.V., Golovin, A.V., Oleinikov, O.B., Deloule, E., Cottin, J.Y.Molecular hydrogen in minerals as a clue to interpret deltaD variations in the mantle. ( Omphacites from eclogites from Kaapvaal and Siberian cratons.)Nature Communications, doi:.org/10.1038/ s41467-020-17442 -8 11p. PdfAfrica, South Africa, Russia, Siberiawater

Abstract: Trace amounts of water dissolved in minerals affect density, viscosity and melting behaviour of the Earth’s mantle and play an important role in global tectonics, magmatism and volatile cycle. Water concentrations and the ratios of hydrogen isotopes in the mantle give insight into these processes, as well as into the origin of terrestrial water. Here we show the presence of molecular H2 in minerals (omphacites) from eclogites from the Kaapvaal and Siberian cratons. These omphacites contain both high amounts of H2 (70 to 460 wt. ppm) and OH. Furthermore, their ?D values increase with dehydration, suggesting a positive H isotope fractionation factor between minerals and H2-bearing fluid, contrary to what is expected in case of isotopic exchange between minerals and H2O-fluids. The possibility of incorporation of large quantities of H as H2 in nominally anhydrous minerals implies that the storage capacity of H in the mantle may have been underestimated, and sheds new light on H isotope variations in mantle magmas and minerals.
DS1997-1251
1997
Ionov, K.H.Wiechert, U., Ionov, K.H.Spinel peridotite xenoliths from the Atsagin Dush volcano, Daringa lavaplateau, Mongolia.. upper mantleContributions to Mineralogy and Petrology, Vol. 126, No. 4, pp. 345-364.GlobalXenoliths, Metasomatism
DS1998-0657
1998
Iouchko, N.A.Iouchko, N.A., Kremenetsky, A.A., Kouznetsov, I.I.Nature of diamonds, melts and fluids in the ring structures: endogeneous explosion vs impact process.7th International Kimberlite Conference Abstract, pp. 342-5.Russia, Siberia, Yakutiavolcanism., Impact structures
DS1989-0113
1989
Ioup, J.W.Bergeron, C.J., Ioup, J.W., Michel, G.A.Interpretation of airborne electromagnetic dat a Using the modified imagemethodGeophysics, Vol. 54, No. 8, August pp. 1023-1030GlobalGeophysics, Electromagnetics
DS1990-0194
1990
Ioup, J.W.Bergeron, C., Morris, T.L., Ioup, J.W.Upward and downward continuation of airborne electromagnetic dataSociety of Exploration Geophysicists, 60th. Annual Meeting held, San, Vol. 1, pp. 696-699. Extended abstractGlobalGeophysics, electromagnetic -airborne
DS201212-0620
2012
Ipatieva, I.S.Samsonov, A.V., Tretyachenko, W., Nosova, A.A., Larionova, Yu.O., Lepekhina, E.N., Larionov, A.N., Ipatieva, I.S.Sutures in the early Precambrian crust as a factor responsible for localization of Diamondiferous kimberlites in the northern east European platform.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractRussia, Kola PeninsulaStructure
DS1860-0594
1888
Irelan, W.JR.Irelan, W.JR.Amador County DiamondsCalifornia Min. Bureau Report., No. 8, PP. 104-106.; P. 116.United States, CaliforniaDiamond Occurrence
DS1999-0614
1999
IrelandRudnick, R.L., Ireland, Gehrels, Irving, Chesley HancharDating mantle metasomatism uranium-lead (U-Pb) geochronology of zircons in cratonic mantle xenoliths ...7th International Kimberlite Conference Nixon, Vol. 2, pp. 728-35.Montana, TanzaniaGeochronology, SHRIMP, analyses, Metasomatism, Highwood Mountains, Labait
DS1993-0329
1993
Ireland, T.Dawson, J.B., Harley, S.L., Rudnick, R.L., Ireland, T.Granulite xenoliths from the Lace kimberlite, South Africa: examples of the Archean lower crust beneath the Kaapvaal craton.The Xenolith window into the lower crust, abstract volume and workshop, p. 7.South AfricaLace Kimberlite
DS200612-1502
2006
Ireland, T.Walker, R.J., Ireland, T., Brandon, A.D.The search for evidence of chemical interactions between the core and mantle.Geochimica et Cosmochimica Acta, Vol. 70, 18, p. 2, abstract only.MantleGeochemistry
DS200912-0008
2009
Ireland, T.Araujo, D.P., Griffin, W.L., O'Reilly, S.Y., Grant, K.J., Ireland, T., Van Achterbergh, E.Micro inclusions in monocrystalline octahedral diamonds and coated diamonds from Diavik, Slave Craton: clues to diamond genesis.Lithos, In press available 38p.Canada, Northwest TerritoriesDeposit - Diavik
DS201212-0018
2012
Ireland, T.Araujo, D.P., Silveira, F.V., Weska, R.K., Rachid, F., Neto, F.E.B., Ireland, T., Holden, P., Gobbo, L.Diamonds from the Sao Francisco and Amazon cratons, Brazil.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractSouth America, BrazilDeposit - Andari, Lencois, Barra do Mendes, Catalao, Frutal
DS201802-0268
2018
Ireland, T.Sun, W-d., Hawkesworth, C.J., Yao, C., Zhang, C-C., Huang, R.f., Liu, X., Sun, X-L, Ireland, T., Song, M-s., Ling, M-x., Ding, X., Zhang, Z-f., Fan, W-m., Wu, Z-q.Carbonated mantle domains at the base of the Earth's transition zone.Chemical Geology, Vol. 478, pp. 69-75.Mantlecarbonatite

Abstract: The oxygen fugacity of the upper mantle is 3-4 orders of magnitude higher than that of the lower mantle and this has been attributed to Fe2 + disproportionating into Fe3 + plus Fe0 at pressures > 24 GPa. The upper mantle might therefore have been expected to have evolved to more oxidizing compositions through geological time, but it appears that the oxygen fugacity of the upper mantle has remained constant for the last 3.5 billion years. Thus, it indicates that the mantle has been actively buffered from the accumulation of Fe3 +, and that this is linked to oxidation of diamond to carbonate coupled with reduction of Fe3 + to Fe2 +. When subducted plates penetrate into the lower mantle, compensational upwelling transports bridgmanite into the transition zone, where it breaks down to ringwoodite and majorite, releasing the ferric iron. The system returns to equilibrium through oxidation of diamond. Early in Earth history, diamond may have been enriched at the base of the transition zone in the Magma Ocean, because it is denser than peridotite melts at depths shallower than 660 km, and it is more buoyant below. Ongoing oxidation of diamond forms carbonate, leading to relatively high carbonate concentrations in the source of ocean island basalts.
DS1992-0757
1992
Ireland, T.R.Ireland, T.R., Wlotzka, F.The oldest zircons in the solar systemEarth and Planetary Science Letters, Vol. 109, No. 1-2, March pp. 1-10GlobalZircons, Geochronology
DS1993-0999
1993
Ireland, T.R.McDonough, W.F., Ireland, T.R.Intraplate origin of komatiites inferred from trace elements in glassinclusionsNature, Vol. 365, No. 6445, September 30, pp. 432-434GlobalKomatiites, Genesis
DS1993-1343
1993
Ireland, T.R.Rudnick, I., Irving, A.J., Ireland, T.R.Evidence for 1.8 Ga mantle metasomatism beneath the northwestern margin Of the Wyoming craton from SHRIMP analyses of zircon in ultramafic xenoliths.Eos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 320.WyomingGeochronology, CRATON.
DS1997-0255
1997
Ireland, T.R.Dawson, J.B., Harley, S.L., Ireland, T.R.Equilibration and reaction in Archean quartz sapphirine granulite xenoliths from Lace kimberlite pipe.Journal of Met. Geology, Vol. 15, No. 2, Mar. 1, pp. 253-266.South AfricaXenoliths, Deposit - Lace
DS1998-1265
1998
Ireland, T.R.Rudnick, R.L., Ireland, T.R., Gehrels, Irving, ChesleyDating mantle metasomatism: uranium-lead (U-Pb) geochronology of zircons in cratonic mantle xenoliths from ...7th. Kimberlite Conference abstract, pp. 754-6.Montana, TanzaniaGeochronology, Deposit - Highwood Mountains, Labait
DS201112-1040
2011
Ireland, T.R.Tian, W., Chen, B., Ireland, T.R., Green, D.H., Suzuki, K., Chu, Z.Petrology and geochemistry of dunites, chromitites and mineral inclusions from the Gaositai Alaskan type complex, North Chin a craton: mantle source charactersLithos, Vol. 127, 1-2, pp. 165-175.ChinaCarbonatite
DS201312-0015
2013
Ireland, T.R.Amelin, Y., Ireland, T.R.Dating the oldest rocks and minerals in the Solar system.Elements, Vol. 9, pp. 39-44.TechnologyGeochronology - meteorites
DS201610-1845
2016
Ireland, T.R.Beyer, C., Klemme, S., Grutzner, T., Ireland, T.R., Magee, C.W., Frost, D.J.Fluorine partitioning between eclogitic garnet, clinopyroxene, and melt at upper mantle conditions.Chemical Geology, Vol. 437, pp. 88-97.MantleLamproite

Abstract: In this experimental study we obtained new mineral/melt (DF = cmineral/cmelt) partitioning data for fluorine in a bimineralic hydrous eclogite under Earth's upper mantle conditions (4-6 GPa, 1460-1550 °C). Omphacitic clinopyroxene displays mineral/melt partition coefficients between DF = 0.056 ± 0.005 and DF = 0.074 ± 0.001. Garnet partition coefficients are consistently lower with an average partition coefficient of DF = 0.016 ± 0.003. We found that omphacitic clinopyroxene is the dominant nominally fluorine-free phase in subducted oceanic crust and hence omphacite is expected to be the major fluorine carrier during subduction of crust into the deeper mantle. Together with previously obtained partitioning data we propose that the oceanic crust can host more fluorine per mass unit than the underlying depleted oceanic mantle. If the majority of entrained fluorine is recycled into Earth's transition zone it is possible that the fluorine is either incorporated into high-pressure transition zone phases or released during high-pressure phase transformations and forming fluorine-rich small degree partial melts. Both scenarios are supported by elevated fluorine concentration in ocean island basalts, kimberlites, and lamproites. Combining the fluorine partitioning data with water partitioning data yields a plausible process to generate lamproitic magmas with a high F/H2O ratio. The enrichment of fluorine relative to H2O is triggered by multiple episodes of small degree melting that deplete the residual more in H2O than in fluorine, caused by the approximately three times smaller mineral-melt partition coefficients of H2O.
DS201906-1355
2019
Ireland, T.R.Timmerman, S., Yeow, H., Honda, M., Howell, D., Jaques, A.L., Krebs, M.Y., Woodland, S., Pearson, D.G., Avila, J.N., Ireland, T.R.U-Th/He systematics of fluid rich 'fibrous' diamonds - evidence for pre- and syn-kimberlite eruption ages.Chemical Geology, Vol. 515, pp. 22-36.Africa, Democratic Republic of Congo, Botswanadeposit - Jwaneng

Abstract: The physical characteristics and impermeability of diamonds allow them to retain radiogenic 4He produced in-situ from radioactive decay of U, Th and Sm. This study investigates the U-Th/He systematics of fibrous diamonds and provides a first step in quantification of the uncertainties associated with determining the in-situ produced radiogenic 4He concentration. Factors determining the total amount of measured helium in a diamond are the initial trapped 4He, the in-situ produced radiogenic 4He, a-implantation, a-ejection, diffusion, and cosmogenic 3He production. Alpha implantation is negligible, and diffusion is slow, but the cosmogenic 3He component can be significant for alluvial diamonds as the recovery depth is unknown. Therefore, samples were grouped based on similar major and trace element compositions to determine possible genetically related samples. A correlation between the 4He and U-Th concentrations approximates the initial 4He concentration at the axis-intersect and age as the slope. In this study, the corrections were applied to eight fibrous cubic diamonds from the Democratic Republic of the Congo and two diamonds from the Jwaneng kimberlite in Botswana. A correlation exists between the 4He and U-Th concentrations of the group ZRC2, 3, and 6, and of the group CNG2, 3, and 4 and both correlations deviate significantly from a 71?Ma kimberlite eruption isochron. The U-Th/He dating method appears a promising new approach to date metasomatic fluid events that result in fibrous diamond formation and this is the first evidence that some fibrous diamonds can be formed 10s to 100s Myr before the kimberlite eruption.
DS1980-0288
1980
Ires de barros.Reis, B., Ires de barros.Sur Quelques Kimberlites de L'angolaProceedings of the 26th International Geological Congress, Proceedings Vol. 3, P. 996. (abstract.)Angola, West AfricaGeology
DS1982-0287
1982
Irifune, T.Irifune, T., Ohtani, E., Kumazawa, M.Stability Field of Knorringite Mg3 Chromium 2 Si3 012 at High Pressure and its implication to the Occurrence of Chromium Rich Pyrope in the Upper Mantle.Physics of The Earth And Plan. Interiors, Vol. 27, PP. 263-272.GlobalMineral Chemistry, Pyrope, Garnet
DS1982-0288
1982
Irifune, T.Irifune, T., Ohtani, E., Kumazawa, M.Stability Field of Knorringite Mg3cr2si3o12 at High Pressure and its Implication to the Occurrence of Chromium Rich Pyrope In the Upper Mantle.Physics of The Earth And Planetary Interiors, Vol. 27, No. 4, PP. 263-272.RussiaGarnet, Kimberlite
DS1986-0383
1986
Irifune, T.Irifune, T., Hibberson, W.O., Ringwood, A.E.Eclogite-garnetite transformations in basaltic and pyrolitic compositions at high pressure and high temperatureProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 259-261GlobalBlank
DS1986-0384
1986
Irifune, T.Irifune, T., Ontani, E.Melting of pyrope Mg3AL2SI2O12 up to 10 GP; possibility of pressureinduced structural change in pyrope meltJournal of Geophysical Research, Vol. 91, No. B9, August 10, pp. 9357-9366GlobalGarnets, Experimental Petrology
DS1986-0385
1986
Irifune, T.Irifune, T., Selkine, T., Ringwood, A.E., Hibberson, W.O.The eclogite garnetite transformation at high pressure and some geophysicalimplicationsEarth and Planetary Science Letters, Vol. 77, pp. 245-256GlobalEclogite
DS1987-0312
1987
Irifune, T.Irifune, T.An experimental investigation of the pyroxene garnet transformation in apyrolite composition and its bearing on the constitution of the mantlePhysics of the Earth and Planetary Interiors, Vol. 45, No. 4, May pp. 324-337GlobalPetrology
DS1987-0313
1987
Irifune, T.Irifune, T., Ringwood, A.E.Phase transformations in a harzburgite composition to 26 GPa:implications for dynamical behaviour of the subducting slabEarth and Planetary Science Letters, Vol. 86, pp. 365-376GlobalBlank
DS1988-0572
1988
Irifune, T.Ringwood, A.E., Irifune, T.Nature of the 650Km seismic discontinuity: implications for mantle dynamics and differentiationNature, Vol. 331, January l4, pp. 131-136GlobalLherzolite
DS1989-0683
1989
Irifune, T.Irifune, T., Hibberson, W.O., Ringwood, A.E.Eclogite-garnetite transformation at high pressure and its bearing on The occurrence of garnet inclusions indiamondGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 877-882GlobalExperimental petrology, Garnet inclusions
DS1993-0719
1993
Irifune, T.Irifune, T., Ringwood, A.E.Phase transformations in subducted oceanic crust and buoyancy relationships at depths of 600-800 km in the mantleEarth and Planetary Science Letters, Vol. 117, pp. 101-110MantleExperimental petrology, Geodynamics
DS1993-0720
1993
Irifune, T.Irifune, T., Ringwood, A.E.Phase transformations in subducted oceanic crust and bouyancy relationships at depths of 600-800 km in the mantleEarth and Planetary Science Letters, Vol. 117, pp. 101-110MantleSubduction
DS1994-0809
1994
Irifune, T.Irifune, T.Absence of an aluminous phase in the upper part of the Earth's lowermantle.Nature, Vol. 370, July 14, pp. 131-133.MantlePerovskite
DS1998-0658
1998
Irifune, T.Irifune, T.Phase transformations in model mantle compositions and nature of the 410 kmand 660 km seismic discontinuity.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 687-8.MantlePetrology - experimental, Pyrolite
DS1998-0659
1998
Irifune, T.Irifune, T., Isshiki, M.Iron partioning in a pyrolite mantle and nature of the 410 km seismicdiscontinuity.Nature, Vol. 392, No. 6677, Apr. 16, pp. 702-704.MantleGeophysics - seismics, Discontinuity
DS2000-0433
2000
Irifune, T.Irifune, T., Miyashita, M., Utsumi, W.high pressure phase transformation in Ca MgSi2O6 and implications for origin of ultra deep diamond inclusionGeophysical Research Letters, Vol. 27, No. 21, Nov. 1, pp. 3541-44.MantleDiamond inclusions, ultra high pressure (UHP)
DS2002-0750
2002
Irifune, T.Irifune, T.Application of synchrotron radiation and Kawai type apparatus to various studies in high pressure mineral physics.Mineralogical magazine, Vol. 66,5, pp. 769-90.GlobalUHP - techniques
DS2003-0621
2003
Irifune, T.Irifune, T., Kurio, A., Sakamoto, S., Inoue, T., Suiniya, H.Ultrahard polycrystalline diamond from graphite. CorrectionNature, No. 6923, Feb. 6, p. 599. also No. 6925, p. 806 Feb 20GlobalDiamond synthesis
DS200412-0873
2004
Irifune, T.Irifune, T., Kuiro, A., Sakamoto, S., Inoue, T., Sumiya, H., Funakoshi, K.Formation of pure polycrystalline diamond by direct conversion of graphite at high pressure and high temperature.Physics of the Earth and Planetary Interiors, Vol. 143-144, pp. 593-600.TechnologyUHP - mineralogy
DS200412-0881
2003
Irifune, T.Isshiki, E., Irifune, T., Hiropse, K., Ono, S., Ohishi, Y., Watanuki, T., Nishibori, E., Takat, M., Sakata, M.Stability of magnesite and its high pressure form in the lowermost mantle.Nature, No. 6969, pp. 60-62.MantleUHP
DS200412-1626
2004
Irifune, T.Rapp, R.P., Irifune, T., Shimizu, N.Recycling of continental sediments into the deep mantle: experimental constraints at 15-25 GPa.Geochimica et Cosmochimica Acta, 13th Goldschmidt Conference held Copenhagen Denmark, Vol. 68, 11 Supp. July, ABSTRACT p.A561.MantleSubduction
DS200512-1063
2005
Irifune, T.Sueda, Y., Irifune, T., Nishiyama, N., Rapp, Ferroir, Onozawa, Yagi, Merkel, Miyajima, FunakoshiA new high pressure form of K Al Si3 08 under lower mantle conditions.Geophysical Research Letters, Vol. 31, 23, Dec. 16, DOI 10.1029/2004 GLO21156MantleUHP
DS200512-1212
2005
Irifune, T.Yamazaki, D., Inoue, T., Okamoto, M., Irifune, T.Grain growth kinetics of ring woodite and its implication for rheology of the subducting slab.Earth and Planetary Science Letters, Advanced in press,MantleSubduction, mantle transition zone
DS200612-0625
2006
Irifune, T.Irifune, T., Higo, Y., Inoue, T., Funakoshi, K.Ultrasonic velocities of majorite garnet and mineralogy of the mantle transition region.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p. 108.MantleMTR - interferometry
DS200612-0777
2006
Irifune, T.Le Guillou, C., Brunet, F., Rouzand, J.N., Irifune, T., Ohfuji, H.New experimental constraints on nanodiamond formation mechanisms from carbon nanoparticles at high pressure.International Mineralogical Association 19th. General Meeting, held Kobe, Japan July 23-28 2006, Abstract p.161.TechnologyNanodiamonds
DS200812-0503
2008
Irifune, T.Irifune, T., Higo, Y., Inoue, T., Kono, Y., Ohfuji, H., Funakoshi, K.Sound velocities of majorite garnet and the composition of the mantle transition zone.Nature, Vol. 451, 7180, pp. 814-817.MantleGeophysics - seismics
DS200812-0939
2008
Irifune, T.Rapp, R.P., Irifune, T., Shimizu, N., Nishiyama, N., Norman, M.D., Inoue, T.Subduction recycling of continental sediments and the origin of geochemically enriched reservoirs in the deep mantle.Earth and Planetary Science Letters, Vol. 271, 1-4, pp. 14-23.MantleSubduction
DS200812-1288
2008
Irifune, T.Yamamoto, J., Ando, J-i., Kagi, H., Inoue, T., Yamada, A., Yamazaki, D., Irifune, T.In situ strength measurements on natural upper mantle minerals.Physics and Chemistry of Minerals, Vol. 35, pp. 249-257.MantleRheology, geocbarometry
DS201012-0311
2010
Irifune, T.Irifune, T., Isobe, F., Shinmei, T., Sanchira, T., Ohfuji, H., Kurio, A., Sumiya, H.Synthesis of ultrahard nano-polycrystalline diamond at high pressure and temperature using a large volume multianvil apparatus.International Mineralogical Association meeting August Budapest, abstract p. 182.TechnologyDiamond synthesis
DS201012-0312
2010
Irifune, T.Irifune, T., Nishiyama, Tange, Kono, Shinmel, Kinoshita, Negishi, Kato, Higo, FunakoshiPhase transitions, densities and sound velocities of mantle and slab materials down to the upper part of the lower mantle.International Mineralogical Association meeting August Budapest, abstract p. 142.MantleSubduction
DS201012-0548
2010
Irifune, T.Ohfuji, H., Okimoto, S., Kunimoto, T., Irifune, T.Influence of graphite crystallinity on the microtexture of polycrystalline diamond obtained by direct conversion.International Mineralogical Association meeting August Budapest, abstract p. 182.TechnologyDiamond synthesis
DS201112-0754
2011
Irifune, T.Ohuchi, T., Kawazoe, T., Nishihara, Y., Nishiyama, N., Irifune, T.High pressure and temperature fabric transitions in olivine and variations in upper mantle seismic anisotropy.Earth and Planetary Science Letters, Vol. 304, 1-2, pp. 55-63.MantleUHP
DS201212-0531
2012
Irifune, T.Ohuchi, T., Kawazo, T., Nishihara, Y., Irifune, T.Change of olivine a-axis alignment by water: origin of seismic anisotropy in subduction zones.Earth and Planetary Science Letters, Vol. 317-318, pp. 111-119.MantleSubduction
DS201212-0717
2012
Irifune, T.Tange, Y., Kuwayma, Y., Irifune, T., Funakoshi, K-I., Ohishi, Y.P-V-T equation of state of MgSiO3 perovskite based on the MgO pressure scale: a comprehensive reference for mineralogy of the lower mantle.Journal of Geophysical Research, Vol. 117, B6, B06201MantlePerovskite
DS201312-0652
2013
Irifune, T.Nishi, M., Irifune, T., Ohfuji, H., Tange, Y.Intracrystalline nucleation during the post garnet transformation under large overpressure conditions in deep subducting slabs.Geophysical Research Letters, Vol. 39, 23,MantleSubduction
DS201312-0653
2013
Irifune, T.Nishi, M., Kubo, T., Ohfuji, H., Kato, T., Nishihara, Y., Irifune, T.Slow Si-Al interdiffusion in garnet and stagnation of subducting slabs.Earth and Planetary Science Letters, Vol. 361, pp. 44-49.MantleSubduction
DS201312-0661
2013
Irifune, T.Obuchi, T., Irifune, T.Development of A type olivine fabric in water rich deep upper mantle.Earth and Planetary Science Letters, Vol. 362, pp. 20-30.MantleSeismic anisotropy
DS201412-0355
2014
Irifune, T.Higo, Y., Matsui, M., Irifune, T.Development of ultrasonic measurement technique under lower mantle conditions.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, 1p. AbstractTechnologyPerovskite
DS201412-0445
2014
Irifune, T.Kato, T., Kinoshita, Y., Nishiyama, N., Wada, K., Zhou, C., Irifune, T.Magnesium silicate perovskite coexisting with ring woodite in harzburgite stagnated at the lowermost mantle transition zone.Physics and Chemistry of the Earth Parts A,B,C, Vol. 232, pp. 26-29.MantlePerovskite
DS201412-0631
2014
Irifune, T.Nishi, M., Irifune, T., Tsuchiya, J., Tange, Y., Nishihara, Y., et al.Stability of hydrous silicate at high pressures and water transport to the deep lower mantle.Science, Vol. 343, pp. 522-525.MantleSubduction
DS201412-0647
2014
Irifune, T.Ohuchi, T., Fujino, K., Kawazoe, T., Irifune, T.Crystallographic preferred orientation of wadsleyite and ringwoodite: effects of phase transformation and water on seismic anisotropy in the mantle transition zone.Earth and Planetary Science Letters, Vol. 397, pp. 133-144.MantleMineral chemistry
DS201603-0366
2016
Irifune, T.Bindi, L., Tamarova, A., Bobrov, A.V., Sirotkina, E.A., Tschauner, O., Walter, M.J., Irifune, T.in corporation of high amounts of Na in ringwoodite: possible implications for transport of alkali into lower mantle.American Mineralogist, Vol. 101, pp. 483-486.MantleRingwoodite
DS201701-0020
2016
Irifune, T.Liu, Z., Du, W., Shinmei, T., Greaux, S., Zhou, C., Arimoto, T., Kunimoto, T., Irifune, T.Garnets in the majorite pyrope system: symmetry, lattice microstain, and order-disorder of cations.Physics and Chemistry of Minerals, in press available 9p.TechnologyGarnet morphology

Abstract: We present a systematic experimental study on the phase transition, lattice microstrain, and order-disorder of cations for garnets in the majorite-pyrope system. Polycrystalline gem-quality garnets were synthesized at high pressure and high temperature using a Kawai-type multi-anvil apparatus. A phase transition from a cubic to tetragonal structure is clearly observed for garnets with the majorite content of more than 74 mol % through X-ray diffraction (XRD) and Raman scattering studies. Microstrain of garnets, evaluated with the Williamson-Hall plot on XRD profiles, shows a nonlinear dependence of the garnet compositions. The variation of the XRD peak broadening suggests the lattice microstrain of these garnets may be associated with the local structural heterogeneities due to the substitution of different cations via the coupled substitution (Mg2+ + Si4+ = 2Al3+) in the garnet structure. The width variation of Raman scattering peaks indicates that cation disorder occurs in the garnet structure for intermediate compositions. It is found that intermediate garnets and end-members have a minimum of microstrain, while those between end-members and intermediate compositions possess a larger microstrain.
DS201709-2059
2017
Irifune, T.Stagno, V., Kono, Y., Greaux, S., Kebukawa, Y., Stopponi, V., Scarlato, P., Lustrino, M., Irifune, T.From carbon in meteorites to carbonatite rocks on Earth.Goldschmidt Conference, abstract 1p.Globalcarbonatite

Abstract: The composition of the early Earth’s atmosphere is believed to result from significant magma outgassing during the Archaean eon. It has been widely debated whether the oxygen fugacity (fo2) of the Earth’s mantle has remained constant over the last ~3.8 Ga to levels where volatiles were mostly in their mobile form [1,2], or whether the mantle has experienced a gradual increase of its redox state [3]. Both hypotheses raise fundamental questions on the effect of composition of the early Earth’s accreting material, the origin and availability of primordial carbon in Earth’s interior, and the migration rate of CO2-rich magmas. In addition, the occurrence in nature of carbonatites (or silicate-carbonatitic rocks), diamonds and carbides indicate a dominant control of the mantle redox state on the volatile speciation over time and, maybe, on mechanisms of their formation, reaction and migration through the silicate mantle. A recent model has been developed that combines both experimental results on the fo2 of preserved carbonaceous chondrites at high pressure and thermodynamic predictions of the the temporal variation of the mantle redox state, with the CO2-bearing magmas that could form in the early asthenospheric mantle. Since any variation in melt composition is expected to cause significant changes in the physical properties (e.g., viscosity and density), the migration rate of these magmas has been determined using recent in situ viscosity data on CO2-rich melts with the falling sphere technique. Our results allow determining the composition of CO2- bearing magmas as function of the increasing mantle redox state over time, and the mechanisms and rate for exchange of carbon between mantle reservoirs.
DS201711-2529
2017
Irifune, T.Tamarova, A.P., Bobrov, A.V., Sirotkina, E.A., Bindi, L., Irifune, T.Melting of model pyrolite under the conditions of the transition zone.Proceedings of XXXIV held Aug. 4-9. Perchuk International School of Earth Sciences, At Miass, Russia, 1p. AbstractMantlemelting
DS201712-2714
2017
Irifune, T.Nomura, R., Zhou, Y., Irifune, T.Melting phase relations in the MgSiO3-CaSiO3 system at 24 Gpa.Progress in Earth and Planetary Science, Vol. 4, pp. 34-MantleBridgmanite, perovskite

Abstract: The Earth’s lower mantle is composed of bridgmanite, ferropericlase, and CaSiO3-rich perovskite. The melting phase relations between each component are key to understanding the melting of the Earth’s lower mantle and the crystallization of the deep magma ocean. In this study, melting phase relations in the MgSiO3-CaSiO3 system were investigated at 24 GPa using a multi-anvil apparatus. The eutectic composition is (Mg,Ca)SiO3 with 81-86 mol% MgSiO3. The solidus temperature is 2600-2620 K. The solubility of CaSiO3 component into bridgmanite increases with temperature, reaching a maximum of 3-6 mol% at the solidus, and then decreases with temperature. The same trend was observed for the solubility of MgSiO3 component into CaSiO3-rich perovskite, with a maximum of 14-16 mol% at the solidus. The asymmetric regular solutions between bridgmanite and CaSiO3-rich perovskite and between MgSiO3 and CaSiO3 liquid components well reproduce the melting phase relations constrained experimentally.
DS201802-0265
2018
Irifune, T.Sirotkina, E.A., Bobrov, A.V., Bindi, L., Irifune, T.Chromium bearing phases in the Earth's mantle: experiments in the Mg2SiO4 MgCr2O4 system at 10-24 Gpa and 1600C.American Mineralogist, Vol. 103, pp. 151-160.Mantlechromites

Abstract: Phase relations in the system Mg2SiO4-MgCr2O4 were studied at 10-24 GPa and 1600°C using a high-pressure Kawai-type multi-anvil apparatus. We investigated the full range of starting compositions for the forsterite-magnesiochromite system to derive a P-X phase diagram and synthesize chromium-bearing phases, such as garnet, wadsleyite, ringwoodite, and bridgmanite of a wide compositional range. Samples synthesized at 10 GPa contain olivine with small chromium content and magnesiochromite. Mg2SiO4 wadsleyite is characterized by the pressure-dependent higher chromium solubility (up to 7.4 wt% Cr2O3). The maximal solubility of chromium in ringwoodite in the studied system (~18.5 wt% Cr2O3) was detected at P = 23 GPa, which is close to the upper boundary of the ringwoodite stability. Addition of chromium to the system moves the boundaries of olivine/wadsleyite and wadsleyite/ring-woodite phase transformations to lower pressures. Our experiments simulate Cr-rich phase assemblages found as inclusions in diamonds, mantle xenoliths, and UHP podiform chromitites.
DS201804-0702
2018
Irifune, T.Irifune, T., Ohuchi, T.Oxidation softens mantle rocks. Nature, Vol. 555, March 15, pp. 314-315.Mantlegeophysics - seismics

Abstract: Seismic waves that propagate through a layer of Earth’s upper mantle are highly attenuated. Contrary to general thinking, this attenuation seems to be strongly affected by oxidation conditions, rather than by water content.
DS201809-1996
2018
Irifune, T.Bobrov, A.V., Tamarova, A.P., Sirotkina, E.A., Zhang, G.S., Irifune, T.Interphase partitioning of minor elements in the transition zone and uppermost lower mantle.Goldschmidt Conference, 1p. AbstractMantlediamond inclusions

Abstract: Interphase partitioning of minor elements was studied experimentally upon partial melting of model pyrolite [1] with addition of 2 wt % H2O, 10, and 15 wt % of multicomponent carbonate at 22-24 GPa and 1300-2200°C. The concentrations of minor elements were analyzed on an Agilent 7500a mass spectrometer. Phase associations included quenched melt (L), bridgmanite (Brd), CaSiO3- perovskite (CaPrv), ringwoodite (Rwd), ferropericlase (Fp), and majoritic garnet (Maj). The sequence of phase assemblages in our runs is consistent to that reported in [2] for melting of anhydrous pyrolite at 24 GPa: Fp+L, Fp+Maj+Brd(Rwd)+L, Fp+Maj+Brd(Rwd)+CaPrv. Most of minor elements, except for Sc, Cr, and Ni, are incompatible for Brd and show slight increase in partitioning coefficients from LREEs to HREEs in the H2O-bearing system. Pyrolite with carbonate is characterized by slightly higher LREE partitioning coefficients. Monovalent elements (Li, K, Cs, Rb), as well as Sr and Pb, are strongly incompatible for Brd in all systems. The similar features are observed for Fp enriched in HREEs and depleted in LREEs; all minor elements show redistribution into Fp with pressure. CaPrv is enriched in LREEs and depleted in HREEs. We applied the lattice strain model [3] for interpretation of the analytical data, which allowed us to study the behavior of minor elements as a function of P-T parameters. Our data and some previous results [4] were used for estimation of the composition of melts in equilibrium with inclusions in diamonds from the transition zone and lower mantle.
DS201812-2835
2018
Irifune, T.Kuwahara, H., Nomura, R., Nakada, R., Irifune, T.Simultaneous determination of melting phase relations of mantle peridotite and mid-ocean ridge basalt at the uppermost lower mantle conditions.Physics of the Earth and Planetary Interiors, Vol. 284, pp. 36-50.Mantleperidotite

Abstract: Interpretation of melting phase relationships of mantle peridotite and subducted basaltic crust is important for understanding chemical heterogeneity in the Earth’s interior. Although numerous studies have conducted melting experiments on peridotite and mid-ocean ridge basalt (MORB), and suggested that the solidus temperature of MORB is lower than that of peridotite at whole mantle pressure conditions, both solidus temperatures overlap within their uncertainties. In this study, we conducted simultaneous experiments on KLB-1 peridotite and normal MORB (N-MORB) at pressures from 25?GPa to 27?GPa and temperatures from 2398?K to 2673?K, to compare the solidus temperatures and their melting phase relations. The experimental results show that the solidus temperature of the N-MORB is nearly identical to the KLB-1 peridotite at 25?GPa but lower at 27?GPa. In addition, we found that the crossover of melt fractions between KLB-1 peridotite and N-MORB occurs at 25-27?GPa. These changes are likely to be attributed to the majorite-bridgmanite transition of MORB. This indicates that the dominant melting component may change depending on the location of the uppermost lower mantle. Our calculation result on the density of partial melts along the mantle geotherm suggests that partial melts of KLB-1 peridotite are gravitationally stable around the top of the transition zone, whereas partial melts of N-MORB are gravitationally stable even at the top of lower mantle. These results suggest that the distribution of partial melts may be different between KLB-1 peridotite and N-MORB in the deep Earth. Our results may be useful for understanding the fate of partial melts of peridotitic mantle and recycled basaltic crust.
DS201812-2888
2018
Irifune, T.Stagno, V., Stopponi, V., Kono, Y., Manning, C.E., Irifune, T.Experimenal determination of the viscosity of Na2CO3 melt between 1.7 and 4.6 Gpa at 1200-1700 C: implications for the rheology of carbonatite magmas in the Earth's upper mantle.Chemical Geology, Vol. 501, pp. 19-25.Mantlecarbonatite

Abstract: Knowledge of the rheology of molten materials at high pressure and temperature is required to understand magma mobility and ascent rate at conditions of the Earth's interior. We determined the viscosity of nominally anhydrous sodium carbonate (Na2CO3), an analogue and ubiquitous component of natural carbonatitic magmas, by the in situ “falling sphere” technique at 1.7, 2.4 and 4.6?GPa, at 1200 to 1700?°C, using the Paris-Edinburgh press. We find that the viscosity of liquid Na2CO3 is between 0.0028?±?0.0001?Pa•s and 0.0073?±?0.0001?Pa•s in the investigated pressure-temperature range. Combination of our results with those from recent experimental studies indicate a negligible dependence on pressure from 1?atm to 4.6?GPa, and a small compositional dependence between molten alkali metal-bearing and alkaline earth metal-bearing carbonates. Based on our results, the viscosity of Na2CO3 is consistent with available viscosity data of both molten calcite (determined at high pressure and temperature) and Na2CO3 at ambient pressure. Molten Na2CO3 is a valid experimental analogue for study of the rheology of natural and/or synthetic near-solidus carbonatitic melts. Estimated values of the mobility and ascent velocity of carbonatitic melts at upper conditions are between 70 and 300?g?cm-3•Pa-1•s-1 and 330-1450?m•year-1, respectively, when using recently proposed densities for carbonatitic melts. The relatively slow migration rate allows magma-rock interaction over time causing seismic anomalies and chemical redox exchange.
DS201908-1788
2019
Irifune, T.Liu, Z., Greaux, S., Cai, N., Siersch, N., Boffa Ballaran, T., Irifune, T., Frost, D.J.Influence of aluminum on the elasticity of majorite pyrope garnets.American Mineralogist, Vol. 104, pp. 929-935.Mantlegarnets

Abstract: The effect of aluminum (Al) on the elasticity of majorite-pyrope garnets was investigated by means of ultrasonic interferometry measurements on well-fabricated polycrystalline specimens. Both velocities and elastic moduli increase almost linearly with increasing Al content within analytical uncertainty. No significant variation of the velocities and elastic moduli is observed across the tetragonal-to-cubic phase transition at majorite with the pyrope content up to 26 mol% along the majorite-pyrope system. The elasticity variation of majorite-pyrope garnets is largely dominated by the Al content, while the phase transition as a result of cation ordering/disordering of Mg and Si via substitution of Al on octahedral sites cannot significantly affect elastic properties. Seismic velocity variations of a garnet-bearing mantle transition zone are therefore dominated by garnet composition (e.g., Al, Fe, Ca, and Na) rather than the tetragonal-to-cubic phase transition because of cation ordering/disordering.
DS202004-0537
2020
Irifune, T.Tamarova, A.P., Marchenko, E.I., Bobrov, A.V., Eremin, N.N., Zinovera, N.G., Irifune, T., Hirata, T., Makino, Y.Interphase REE partitioning at the boundary between the Earth's transition zone and lower mantle: evidence from experiments and atomistic modeling.Minerals MDPI, Vol. 10, 10030262 14p. PdfMantleREE

Abstract: Trace elements play a significant role in interpretation of different processes in the deep Earth. However, the systematics of interphase rare-earth element (REE) partitioning under the conditions of the uppermost lower mantle are poorly understood. We performed high-pressure experiments to study the phase relations in key solid-phase reactions CaMgSi2O6 = CaSiO3-perovskite + MgSiO3-bridgmanite and (Mg,Fe)2SiO4-ringwoodite = (Mg,Fe)SiO3-bridgmanite + (Mg,Fe)O with addition of 1 wt % of REE oxides. Atomistic modeling was used to obtain more accurate quantitative estimates of the interphase REE partitioning and displayed the ideal model for the high-pressure minerals. HREE (Er, Tm, Yb, and Lu) are mostly accumulated in bridgmanite, while LREE are predominantly redistributed into CaSiO3. On the basis of the results of experiments and atomistic modeling, REE in bridgmanite are clearly divided into two groups (from La to Gd and from Gd to Lu). Interphase REE partition coefficients in solid-state reactions were calculated at 21.5 and 24 GPa for the first time. The new data are applicable for interpretation of the trace-element composition of the lower mantle inclusions in natural diamonds from kimberlite; the experimentally determined effect of pressure on the interphase (bridgmanite/CaSiO3-perovskite) REE partition coefficients can be a potential qualitative geobarometer for mineral inclusions in super-deep diamonds.
DS202006-0935
2020
Irifune, T.Matrosova, E.A., Bobrov, A.V., Bindi, L., Pushcharovsky, D.Yu., Irifune, T.Titanium-rich phases in the Earth's transition zone and lower mantle: evidence from experiments in the system Mg)-Si)2-TiO2(+- Al2O3Lithos, Vol. 366-367, 14p. PdfMantlewebsterite, bridgmanite

Abstract: Phase relations in the MgSiO3-MgTiO3 and Mg3Al2Si3O12-MgTiO3 systems were studied at 10-24 GPa and 1600 °C using a high-pressure Kawai-type multianvil apparatus. We investigated the full range of starting compositions for the enstatite-geikielite system to derive a P-X phase diagram and synthesize titanium-bearing phases, such as olivine/wadsleyite, rutile, pyroxene, MgTiSi2O7 weberite, bridgmanite and MST-bridgmanite in a wide pressure range. Olivine and pyroxene in run products are characterized by a low titanium content (<0.6 and <0.3 wt% TiO2, respectively) whereas the content of TiO2 in wadsleyite reaches 2 wt% at 12 GPa. The concentration of Ti in MgTiSi2O7 weberite decreases with pressure from 52 wt% TiO2 at 14 GPa to 43 wt% TiO2 at 18 GPa. Two perovskite-type structures (MgSiO3 bridgmanite and Mg(Si,Ti)O3 bridgmanite) were detected in the studied system. MgSiO3 bridgmanite (Brd) is formed at a pressure of >20 GPa and characterized by significant titanium solubility (up to 13 wt% TiO2 at 24 GPa). Mg(Si,Ti)O3 perovskite is formed at a pressure of >17 GPa. The concentration of TiO2 in this phase varies from 29 wt% to 49 wt%. It was found that addition of Ti to the system moves the boundaries of Ol/Wad phase transformations to lower pressures. Addition of Al to the starting material allows us to simulate the composition of natural Ti-rich garnets and bridgmanites. It is important to note that garnet in the Prp-Gkl system is stable throughout a wide pressure range (10-24 GPa). Al incorporation does not affect the distribution of titanium between two types of bridgmanite. It is shown that high contents of Ti stabilize bridgmanite-like compounds at considerably lower pressure than that at the lower mantle/transition zone boundary. Our experiments simulate the composition of natural Ti-rich primary garnet found in eclogite from the Sulu ultrahigh-pressure (UHP) terrane.
DS202008-1420
2020
Irifune, T.Matrosova, E.M., Bobrov, A.V., Bindi, L., Pushcharovsky, D.Yu., Irifune, T.Titanium rich phases in the Earth's transition zone and lower mantle: evidence from experiments in the system MgO-SiO2-TiO2(+-Al2O3) at 10-24 Gpa and 1600 C.Lithos, Vol. 366-367 1055539 14 p. pdfMantlebridgemanite

Abstract: Phase relations in the MgSiO3-MgTiO3 and Mg3Al2Si3O12-MgTiO3 systems were studied at 10-24 GPa and 1600 °C using a high-pressure Kawai-type multianvil apparatus. We investigated the full range of starting compositions for the enstatite-geikielite system to derive a P-X phase diagram and synthesize titanium-bearing phases, such as olivine/wadsleyite, rutile, pyroxene, MgTiSi2O7 weberite, bridgmanite and MST-bridgmanite in a wide pressure range. Olivine and pyroxene in run products are characterized by a low titanium content (<0.6 and <0.3 wt% TiO2, respectively) whereas the content of TiO2 in wadsleyite reaches 2 wt% at 12 GPa. The concentration of Ti in MgTiSi2O7 weberite decreases with pressure from 52 wt% TiO2 at 14 GPa to 43 wt% TiO2 at 18 GPa. Two perovskite-type structures (MgSiO3 bridgmanite and Mg(Si,Ti)O3 bridgmanite) were detected in the studied system. MgSiO3 bridgmanite (Brd) is formed at a pressure of >20 GPa and characterized by significant titanium solubility (up to 13 wt% TiO2 at 24 GPa). Mg(Si,Ti)O3 perovskite is formed at a pressure of >17 GPa. The concentration of TiO2 in this phase varies from 29 wt% to 49 wt%. It was found that addition of Ti to the system moves the boundaries of Ol/Wad phase transformations to lower pressures. Addition of Al to the starting material allows us to simulate the composition of natural Ti-rich garnets and bridgmanites. It is important to note that garnet in the Prp-Gkl system is stable throughout a wide pressure range (10-24 GPa). Al incorporation does not affect the distribution of titanium between two types of bridgmanite. It is shown that high contents of Ti stabilize bridgmanite-like compounds at considerably lower pressure than that at the lower mantle/transition zone boundary. Our experiments simulate the composition of natural Ti-rich primary garnet found in eclogite from the Sulu ultrahigh-pressure (UHP) terrane.
DS1989-0684
1989
Irons, L.A.Irons, L.A.Using a borehole geophysical logging program in poorly consolidated sediments for a hazardous wasteinvestigationGeophysics: The leading edge of exploration, Vol. 8, No. 1, January pp. 24-33GlobalPossible application?, Geophysics
DS1998-0215
1998
IrvineCarlson, R.W., Pearson, D.G., Boyd, F.R., Shirey, IrvineRegional age variation of the southern African mantle: significance for model lithospheric mantle formation..7th International Kimberlite Conference Abstract, pp. 135-137.South AfricaGeochronology, Craton - on and off ages
DS2000-0139
2000
IrvineCarlson, R.W., Janney, Shirey, Boyd, Pearson, IrvineChemical and age structure of the southern African lithospheric mantle: implications continent formationGeological Society of America (GSA) Abstracts, Vol. 32, No. 7, p.A-163.South AfricaMantle xenoliths - Kaapvaal Craton, Geophysics - seismics
DS1998-0660
1998
Irvine, G.J.Irvine, G.J., Pearson, D.G., Carlson, R.W., Boyd, F.R.Platinum group element constraints on the origin of cratonic peridotites: a study of Kimberley xenoliths..7th International Kimberlite Conference Abstract, pp. 346-8.South AfricaXenoliths - platinum group elements (PGE), Deposit - Kimberley
DS2001-0511
2001
Irvine, G.J.Irvine, G.J., Pearson, D.G., Carlson, R.W.Lithospheric mantle evolution of the Kaapvaal Craton : a Rhenium- Osmium (Re-Os) isotope study of peridotite nodules kimberlitesGeophysical Research Letters, Vol. 28, No. 13, July 1, pp. 2505-08.LesothoGeochronology
DS2001-0512
2001
Irvine, G.J.Irvine, G.J., Pearson, Kopylova, Carlson, KjarsgaardThe age of two cratons: a platinum group elements (PGE) and Os isotopic study of peridotite c xenoliths from the Jericho, Somerset Isl.Slave-Kaapvaal Workshop, Sept. Ottawa, 5p. abstractNorthwest Territories, Nunavut, Somerset IslandGeochronology, Churchill Province, Slave Craton, Deposit - Jericho
DS2003-0622
2003
Irvine, G.J.Irvine, G.J., Pearson, D.G., Kjarsgaard, B.A., Carlson, R.W., Kopylova, M.G.A Re Os isotope and PGE study of kimberlite derived peridotite xenoliths fromLithos, Vol. 71, 2-4, pp. 461-488.South Africa, Northwest Territories, NunavutGeochronology
DS2003-1278
2003
Irvine, G.J.Simon, N.S., Irvine, G.J., Davies, G.R., Pearson, D.G., Carlson, R.W.The origin of garnet and clinopyroxene in 'depleted' Kaapvaal peridotitesLithos, Vol. 71, 2-4, pp. 289-322.South AfricaMineral chemistry
DS200412-0874
2003
Irvine, G.J.Irvine, G.J., Pearson, D.G., Kjarsgaard, B.A., Carlson, R.W., Kopylova, M.G., Dreibus, G.A Re Os isotope and PGE study of kimberlite derived peridotite xenoliths from Somerset Island and a comparison to the Slave andLithos, Vol. 71, 2-4, pp. 461-488.Africa, South Africa, Northwest Territories, NunavutGeochronology
DS200412-1508
2004
irvine, G.J.Pearson, D.G., irvine, G.J., Ionov, D.A., Boyd, F.R., Dreibus, G.E.The Re Os systematics and platinum group element fractionation during mantle melt extraction: a study of massif and xenolith perChemical Geology, Vol. 208, 1-4, pp. 29-59.Africa, Lesotho, Namibia, MoroccoGeochronology, mantle melt extraction
DS200412-1831
2003
Irvine, G.J.Simon, N.S., Irvine, G.J., Davies, G.R., Pearson, D.G., Carlson, R.W.The origin of garnet and clinopyroxene in 'depleted' Kaapvaal peridotites.Lithos, Vol. 71, 2-4, pp. 289-322.Africa, South AfricaMineral chemistry
DS200812-1259
2008
Irvine, G.J.Wittig, N., Pearson, D.G., Webb, M., Ottley, C.J., Irvine, G.J., Kopylova, M., Jensen, S.M., Nowell, G.M.Origin of cratonic lithospheric mantle roots: a geochemical study of peridotites from the North Atlantic Craton, West Greenland.Earth and Planetary Science Letters, In press available, 83p.Europe, GreenlandGeochemistry
DS200812-1260
2008
Irvine, G.J.Wittig, N., Pearson, D.G., Webb, M., Ottley, C.J., Irvine, G.J., Kopylova, M., Jensen, S.M., Nowell, G.M.Origin of cratonic lithospheric mantle roots: a geochemical study of peridotites from the North Atlantic craton, West Greenland.Earth and Planetary Science Letters, Vol. 274, 1-2, pp. 24-33.Europe, GreenlandGeochemistry
DS1989-0685
1989
Irvine, T.N.Irvine, T.N.A global convection framework: concepts of symmetry,stratification, and system in the earth's dynamicstructureEconomic Geology, Vol. 84, No. 8, December pp. 2059-2114GlobalMantle, Tectonics
DS1991-0769
1991
Irvine, T.N.Irvine, T.N.Igneous and metamorphic petrology -field studiesCarnegie Institute Annual Report of the Director Geophysical Laboratory, No. 2250, pp. 3-11Hawaii, Antarctica, Botswana, Peru, VietnamGlobal convection system, Mantle convection
DS1998-1083
1998
irvingNowell, G.M., Pearson, D.G., Kempton, irving, TurnerA Hafnium isotope study of lamproites: implications for their origins and relationships to kimberlite.7th International Kimberlite Conference Abstract, pp. 637-9.Montana, Australia, SpainGeochronology, Lamproites
DS1998-1265
1998
IrvingRudnick, R.L., Ireland, T.R., Gehrels, Irving, ChesleyDating mantle metasomatism: uranium-lead (U-Pb) geochronology of zircons in cratonic mantle xenoliths from ...7th. Kimberlite Conference abstract, pp. 754-6.Montana, TanzaniaGeochronology, Deposit - Highwood Mountains, Labait
DS1999-0614
1999
IrvingRudnick, R.L., Ireland, Gehrels, Irving, Chesley HancharDating mantle metasomatism uranium-lead (U-Pb) geochronology of zircons in cratonic mantle xenoliths ...7th International Kimberlite Conference Nixon, Vol. 2, pp. 728-35.Montana, TanzaniaGeochronology, SHRIMP, analyses, Metasomatism, Highwood Mountains, Labait
DS1970-0937
1974
Irving, A.J.Irving, A.J.Megacrysts from the Newer Basalts and Other Basaltic Rocks Of Southeastern Australia.Neues Jahrbuch fnr Mineralogie, Vol. 120, PP. 147-167.AustraliaKimberlite, New South Wales, Victoria
DS1970-0938
1974
Irving, A.J.Irving, A.J.Geochemical and High Pressure Experimental Studies of Garnet Pyroxenite and Pyroxene Granulite Xenoliths from the Delegate Basaltic Pipes, Australia.Journal of Petrology, Vol. 15, PP. 1-40.Australia, New South WalesKimberlite, Non Kimberlitic Breccia Pipes
DS1975-0296
1976
Irving, A.J.Irving, A.J., Green, D.H.Geochemistry and Petrogenesis of the Newer Basalts of Victoria and South Australia.Geological Society AUST. Journal, Vol. 23, PP. 45-66.AustraliaKimberlite
DS1975-0429
1976
Irving, A.J.Wass, S.Y., Irving, A.J.Xenmeg: a Catalogue of Occurrences of Xenoliths and Megacrysts in Volcanic Rocks of Eastern Australia.Sydney: Australia Museum., 441P.AustraliaKimberlite, Basalt, Kimberley
DS1980-0181
1980
Irving, A.J.Irving, A.J.Petrology and Geochemistry of Composite Ultramafic Xenoliths in Alkalic Basalts and Implications for Magmatic Processes within the Mantle.American Journal of Science, Vol. 280A, PP. 389-426.United States, Arizona, New Mexico, Kilbourne Hole, Colorado PlateauBlank
DS1981-0108
1981
Irving, A.J.Bussod, G.Y., Irving, A.J.Thermal and Rheologic History of the Upper Mantle Beneath The Southern Rio Grande Rift; Evidence from Kilbourne Hole Xenoliths.In: Papers Presented To The Conference On The Processes of P, No. 457, PP. 145-148.GlobalBlank
DS1981-0221
1981
Irving, A.J.Irving, A.J., Price, R.C.Geochemistry and Evolution of Lherzolite Bearing Phonolitic lavas from Nigeria, Australia, East Germany, and New Zealand.Geochimica Et Cosmochimica Acta, Vol. 45, No. 8, PP. 1309-L320.GlobalPhonolite, Xenolith
DS1982-0409
1982
Irving, A.J.Mathez, E.A., Dietrich, V.J., Irving, A.J.Abundances of Carbon in Mantle Xenoliths from Alkalic BasaltProceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. L99-200, (abstract.).GlobalKimberlite, Spinel, Lherzolite, Nunivak
DS1984-0371
1984
Irving, A.J.Irving, A.J., Frey, F.A.Trace Element Abundances in Megacrysts and Their Host Basalts: Constraints on Partition Coefficients and Megacryst Genesis.Geochimica et Cosmochimica Acta ., Vol. 48, PP. 1201-1221.United States, New Mexico, Colorado PlateauKilbourne Hole, Ultrabasic Rocks
DS1984-0493
1984
Irving, A.J.Mathez, E.A., Dietrich, V.J., Irving, A.J.The Geochemistry of Carbon in Mantle PeridotitesGeochimica et Cosmochimica Acta ., Vol. 49, No. 9, PP. 1849-1859.GlobalPetrology, Kimberlites, Alkali Basalts
DS1985-0502
1985
Irving, A.J.O'brien, H.E., Irving, A.J., Mccallum, I.S.Complex Zoning of Clinopyroxene in Shonkinites from Mafic Phonolites, Highwood Mountains, Montana: Evidence for Periodic Mixing with a K Rich Bananitic Magma.Geological Society of America (GSA), Vol. 17, No. 3, P. 187. (abstract.).United States, Montana, Rocky MountainsMineralogy
DS1986-0386
1986
Irving, A.J.Irving, A.J.Polybaric magma mixing in alkalic basalts and kimberlites:evidence fromcorundum, zircon and ilmenite megacrystsProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 262-264GlobalRubyvale
DS1986-0615
1986
Irving, A.J.O'Brien, H.E., Irving, A.J., McCallum, I.S.Evolution og minette, lamproite and mafic phonolite magmas in the Highwood Mountains province, Montana USA: geochemical andmineralogicalevidenceProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 199-201MontanaBlank
DS1987-0543
1987
Irving, A.J.O'Brien, H.E., Irving, A.J., McCallum, I.S.Geochemical evidence for ancient enriched and eocene arc components In the source region of the Highwood mountains potassic volcanics, MontanaTerra Cognita, Conference abstracts Oceanic and Continental Lithosphere:, Vol. 7, No. 4, Autumn, abstract only p. 621MontanaBlank
DS1988-0581
1988
Irving, A.J.Roden, M.F., Irving, A.J., Rama Murthy, V.Isotopic and trace element composition of the upper mantle beneath a young continental rift: results from Kilbourne Hole,New MexicoGeochimica et Cosmochimica Acta, Vol. 52, No. 2, February pp. 461-474New MexicoBlank
DS1989-0686
1989
Irving, A.J.Irving, A.J., O'Brieb, H.E., McCallum, I.S.Precambrian mantle beneath Montana: geochemical evidence from Eocene volcanics and their xenolithsLpi Technical Report, No. 89-05, pp. 45-46MontanaMantle xenoliths, Age determinations
DS1989-0687
1989
Irving, A.J.Irving, A.J., O'Brien, H.E., McCallum, I.S.Montana potassic volcanism: geochemical evidence for interaction of asthenopsheric melts and meta-somatically-veinedPrec. subcontinental mantlelithNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 140 Abstract held June 25-July 1MontanaVolcanology, Mantle
DS1990-0814
1990
Irving, A.J.Kelemen, P.B., Johnson, K.T.M., Kinzler, R.J., Irving, A.J.High field strength element depletions in arc basalts due to mantle magmainteractionNature, Vol. 345, June 7, pp. 521-524GlobalMantle, Basalts
DS1990-1596
1990
Irving, A.J.Xianyu Xue, Baadsgaard, H., Irving, A.J., Scarfe, C.M.Geochemical and isotopic characteristics of lithospheric mantle beneath West Kettle River, British Columbia: evidence from ultramafic xenoliths #2Journal of Geophysical Research, Vol. 95, No. B 10, September 10, pp. 15, 879-15, 891British ColumbiaGeochemistry, Mantle xenoliths
DS1991-0225
1991
Irving, A.J.Carlson, R.W., Irving, A.J.Osmium, Strontium, neodymium and lead isotopic studies of Montana mantle xenoliths: long term preservation of basalt depleted, LIL element-enriched lithosphereGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 211MontanaGeochronology, Xenoliths
DS1991-0770
1991
Irving, A.J.Irving, A.J., Carlson, R.W.Mantle xenoliths in potassic magmas from Montana: Strontium, neodymium, and Osmium isotopic constraints on the evolution of the Wyoming craton lithosphereProceedings of Fifth International Kimberlite Conference held Araxa June, pp. 183-185MontanaHighwood Mountains, Glimmerite, Minettes
DS1991-0771
1991
Irving, A.J.Irving, A.J., Menzies, M.A.Isotopic evidence for variably enriched Mid Ocean Ridge Basalt (MORB) lithospheric mantle in xenoliths from North Queensland, AustraliaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 186-187AustraliaAlkalic basalt, Mantle
DS1991-0772
1991
Irving, A.J.Irving, A.J., O'Brien, H.E.Isotopic and trace element remote sensing of Montana continental lithosphere from erupted magmasProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 188-189MontanaMissouri Breaks, Haystack Butte, Indian Flats, Highwood, Bearpaw, Volcano Butte, Black Butte, Smoky Butte, lamproite
DS1992-0758
1992
Irving, A.J.Irving, A.J., Hirschmann, M.M., Kuehner, S.M.Exsolution of chromite and diopside from mantle olivine: Montana dunitexenoliths and the Twin Sisters duniteEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p.336Montana, WashingtonMantle, Xenoliths
DS1993-0721
1993
Irving, A.J.Irving, A.J., Carlson, R.W., Hearn, B.C.Jr.Differentiation history of lithospheric mantle: Osmium, Strontium, neodymium and lead isotopic evidence from garnet peridotite xenoliths, Williams kimberlite, MontanaEos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 320MontanaGeochronology
DS1993-1343
1993
Irving, A.J.Rudnick, I., Irving, A.J., Ireland, T.R.Evidence for 1.8 Ga mantle metasomatism beneath the northwestern margin Of the Wyoming craton from SHRIMP analyses of zircon in ultramafic xenoliths.Eos, Transactions, American Geophysical Union, Vol. 74, No. 16, April 20, supplement abstract p. 320.WyomingGeochronology, CRATON.
DS1994-0269
1994
Irving, A.J.Carlson, R.W., Irving, A.J.Depletion and enrichment history of subcontinental lithospheric mantle: anOs, Sr, neodymium and lead isotope studyEarth and Planetary Science Letters, Vol. 126, No. 4, Sept. pp. 457-472.WyomingXenoliths, Wyoming Craton
DS1994-0810
1994
Irving, A.J.Irving, A.J., O'Brien, H.E.Geochemistry of mafic shoshonitic Adel Mountain volcanics, Montana. Late Cretaceous arc related magma.Geological Society of America (GSA) Abstract Volume, Vol. 26, No. 7, ABSTRACT only p. A40.MontanaIgneous petrology, Shoshonites
DS1994-1909
1994
Irving, A.J.Whitney, D.L., Irving, A.J.Origin of Potassium poor leucosomes in a metased migmatite complex byultrametamorphism, syn-metamorphic magmatismLithos, Vol. 32, No. 3-4, July pp. 173-192GlobalMigmatite, migmatites, Magma, metamorphism, ultra, syn, subsolidus
DS1995-1371
1995
Irving, A.J.O'Brien, H.E., Irving, A.J., Thirlwall, M.F.Strontium, neodymium, lead isotope evidence for interaction post subduction asthenospheric potassic mafic magmas....Geochimica et Cosmochimica Acta, Vol. 59, No. 21, Nov. 1, pp. 4539-62.MontanaHighwood Mountains, Wyoming craton, mantle
DS1995-1460
1995
Irving, A.J.Pearson, D.G., Rogers, N.W., Irving, A.J., Smith, C.B.Source regions of kimberlites and lamproites: constraints from Rhenium- Osmium (Rhenium- Osmium (Re-Os))isotopes.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 430-432.South AfricaGeochronology, Lamproites
DS1998-0214
1998
Irving, A.J.Carlson, R.W., Irving, A.J., Hearn, B.C.Jr.Peridotite xenoliths from the William kimberlite, Montana: implications for delamination Wyoming Craton7th International Kimberlite Conference Abstract, pp. 132-4.MontanaLithosphere - geochronology, Deposit - WilliaM.
DS1998-0661
1998
Irving, A.J.Irving, A.J., Kuehner, S.M.Petrology and geochemistry of the Ruby Slipper lamproite: a leucite bearing ultrapotassic magma ...7th International Kimberlite Conference Abstract, pp. 349-51.MontanaArc - Eocene continental, Deposit - Ruby Slipper
DS1998-0813
1998
Irving, A.J.Kuehner, S.M., Irving, A.J.Corundum kyanite eclogite, grospydite and epidote amphibolite of probable subducted slab origin ...7th International Kimberlite Conference Abstract, pp. 475-7.WyomingPaleogene diamondiferous pipes, Deposit - Cedar Mountain
DS2003-0215
2003
Irving, A.J.Carlson, R.W., Irving, A.J., Schulze, D.J., Hearn, Jr. B.C.Timing of lithospheric mantle modification beneath the Wyoming Craton8 Ikc Www.venuewest.com/8ikc/program.htm, Session 4, AbstractColorado, MontanaMantle geochemistry, Geochronology, Sloan, Homestead, Williams
DS2003-0623
2003
Irving, A.J.Irving, A.J., Kuehner, S.M., Ellsworth, P.C.Petrology and thermobarometry of mantle xenoliths from the Eocene Homestead8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, AbstractMontanaMantle petrology, Deposit - Homestead
DS2003-0755
2003
Irving, A.J.Kuehner, S.M., Irving, A.J., O'Brien, H.E.A kalborsite pitiglianoite kalsilite shcherbakovite barytolam prophyllite wadeite bearing8 Ikc Www.venuewest.com/8ikc/program.htm, Session 7, POSTER abstractMontanaBlank
DS200412-0278
2004
Irving, A.J.Carlson, R.W., Irving, A.J., Schulze, D.J., Carter Hearn, B.Jr.Timing of Precambrian melt depletion and Phanerozoic refertilization events in the lithospheric mantle of the Wyoming Craton andLithos, Vol. 77, 1-4, Sept. pp. 453-472.United States, Colorado, MontanaSloan, Williams, Homestead, geochronology, Sr Nd Hf Os
DS200412-0279
2003
Irving, A.J.Carlson, R.W., Irving, A.J., Schulze, D.J., Hearn, Jr.B.C.Timing of lithospheric mantle modification beneath the Wyoming Craton.8 IKC Program, Session 4, AbstractUnited States, Colorado, MontanaMantle geochemistry Geochronology, Sloan, Homestead, Williams
DS200412-0875
2003
Irving, A.J.Irving, A.J., Kuehner, S.M., Ellsworth, P.C.Petrology and thermobarometry of mantle xenoliths from the Eocene Homestead kimberlites, central Montana, USA.8 IKC Program, Session 6, AbstractUnited States, MontanaMantle petrology Deposit - Homestead
DS200412-1061
2003
Irving, A.J.Kuehner, S.M., Irving, A.J., O'Brien, H.E.A kalborsite pitiglianoite kalsilite shcherbakovite barytolam prophyllite wadeite bearing lamproitic dike from the northern Highw8 IKC Program, Session 7, POSTER abstractUnited States, MontanaKimberlite petrogenesis
DS200812-0504
2008
Irving, A.J.Irving, A.J., Gree, D.H.Phase relationships of hydrous alkalic magmas at high pressures: production of nepheline hawaiitic to mugearitic liquids by amphibole dominated fractionalJournal of Petrology, Vol. 49, 4, pp. 741-756.MantleNephelinite
DS200812-0804
2008
Irving, A.J.Nowell, G.M., Pearson, D.G., Irving, A.J.Lu Hf and Re Os isotope studies of lamproite genesis.9IKC.com, 3p. extended abstractUnited States, Australia, CanadaLamproite - geochronology
DS200812-0869
2008
Irving, A.J.Pearson, D.G., Nowell, G.M., Klein Ben-David, O., Kjarsgaard, B.A.,Irving, A.J.Isotopic constraints on the source regions of alkaline volcanics.Goldschmidt Conference 2008, Abstract p.A731.MantleLamproite, Group I kimberlites, geochronology
DS1960-0124
1961
Irving, E.Boeson, R., Irving, E., Robertson, W.A.The Paleomagnetism of Some Igneous Rock Bodies in New Southwales.Royal Society. NEW SOUTH WALES Transactions, Vol. 94, PP. 224-232.AustraliaKimberlite, Non Kimberlitic Breccia Pipes
DS1992-1702
1992
Irving, E.Wynne, P.J., Irving, E., Schulz, D.J., Hall, D.C., Helmstaedt, H.H.Paleomagnetism and age of three Canadian Rocky Mountain diatremesCanadian Journal of Earth Sciences, Vol. 29, No. 1, January pp. 35-47British ColumbiaDiatremes -Cross, Blackfoot, HP pipe, Paleomagnetics
DS1998-0078
1998
Irving, E.Barendregt, R.W., Irving, E.Changes in the extent of North American ice sheets during the LateCenozoic.Canadian Journal of Earth Sciences, Vol. 35, No. 5, May pp. 504-9.Alberta, Saskatchewan, Northwest TerritoriesGeomorphology, Glaciation - not specific to diamonds
DS200812-0274
2007
Irving, E.De Rosemond, S., Irving, E., Liber, K.Benthic invertebrate colonization of kimberlite tailings from the Ekati diamond mine.Canadian Technical Report of Fisheries and Aquatic Sciences, No. 2746, p.27, Ingenta art1075288601Canada, Northwest TerritoriesDeposit - Ekati environmental
DS201605-0846
2016
Irving, J.C.E.Irving, J.C.E.Imaging the inner core under Africa and Europe.Physics of the Earth and Planetary Interiors, Vol. 254, pp. 12-24.Africa, EuropeGeophysics - seismics, anisotropy, boundary

Abstract: The inner core under Africa is thought to be a region where the nature of inner core texture changes: from the strongly anisotropic ‘western’ part of the inner core to the weakly anisotropic, or isotropic ‘eastern’ part of the inner core. Additionally, observations of a difference in isotropic velocity between the two hemispheres have been made. A very large new dataset of simultaneous PKPdf and PKPbc observations, on which differential travel times have been measured, is used to examine the upper 360 km of the inner core under Europe, Africa and the surrounding oceans. Inversion of the differential travel time data for laterally varying inner core anisotropy reveals that inner core anisotropy is stronger under central Africa and the Atlantic Ocean than under the western Indian Ocean. No hemispherical pattern is present in Voigt isotropic velocities, indicating that the variation in anisotropy is due to differing degrees of crystal alignment in the inner core, not material differences. When anisotropy is permitted to change with depth, the upper east-most part of the study region shows weaker anisotropy than the central and western regions. When depth dependence in the inner core is neglected the hemisphere boundary is better represented as a line at 40°E than one at 10°E, however, it is apparent that the variation of anisotropy as a function of depth means that one line of longitude cannot truly separate the more and less anisotropic regions of the inner core. The anisotropy observed in the part of the inner core under Africa which lies in the ‘western’ hemisphere is much weaker than that under central America, showing that the western hemisphere is not uniformly anisotropic. As the region of low anisotropy spans a significant depth extent, it is likely that heterogeneous heat fluxes in the core, which may cause variations in inner core anisotropy, have persisted for several hundred million years.
DS201608-1412
2016
Irving, J.C.E.Irving, J.C.E.Imaging the inner core under Africa and Europe.Physics of the Earth and Planetary Interiors, Vol. 254, pp. 12-24.Africa, EuropeAnisotropy

Abstract: The inner core under Africa is thought to be a region where the nature of inner core texture changes: from the strongly anisotropic ‘western’ part of the inner core to the weakly anisotropic, or isotropic ‘eastern’ part of the inner core. Additionally, observations of a difference in isotropic velocity between the two hemispheres have been made. A very large new dataset of simultaneous PKPdf and PKPbc observations, on which differential travel times have been measured, is used to examine the upper 360 km of the inner core under Europe, Africa and the surrounding oceans. Inversion of the differential travel time data for laterally varying inner core anisotropy reveals that inner core anisotropy is stronger under central Africa and the Atlantic Ocean than under the western Indian Ocean. No hemispherical pattern is present in Voigt isotropic velocities, indicating that the variation in anisotropy is due to differing degrees of crystal alignment in the inner core, not material differences. When anisotropy is permitted to change with depth, the upper east-most part of the study region shows weaker anisotropy than the central and western regions. When depth dependence in the inner core is neglected the hemisphere boundary is better represented as a line at 40°E than one at 10°E, however, it is apparent that the variation of anisotropy as a function of depth means that one line of longitude cannot truly separate the more and less anisotropic regions of the inner core. The anisotropy observed in the part of the inner core under Africa which lies in the ‘western’ hemisphere is much weaker than that under central America, showing that the western hemisphere is not uniformly anisotropic. As the region of low anisotropy spans a significant depth extent, it is likely that heterogeneous heat fluxes in the core, which may cause variations in inner core anisotropy, have persisted for several hundred million years.
DS1990-0744
1990
Irving, M.Irving, M.Timor Sea may yield Kimberley diamondsAustralia, August 3, 1pAustraliaNews item, Cambridge Gulf Exploratio
DS2001-0513
2001
Irving, M.Irving, M., Malmsten, C., Elliot, D.Diamond value added in Canada's Northwest Territories37th. Forum Industrial Minerals;, May 23-5, p. 89.Northwest TerritoriesEconomics
DS2002-0197
2002
Irving, M.Boyd, B., Irving, M.The development of government policies on diamondsCanadian Institute of Mining and Metallurgy, Vol. 53, Industrial Minerals of Canada, pp. 363-5.CanadaLegal
DS200712-0465
2006
Irving, M.Irving, M.The Canadian diamond industry: where to now?Gems & Gemology, 4th International Symposium abstracts, Fall 2006, p.24 abstract onlyCanadaEconomics
DS200812-0505
2007
Irving, M.Irving, M.So much room to grow... Canada's diamond industry and potential.Canadian Diamonds, Fall, p. 10, 46.CanadaBrief overview of diamond industry
DS200812-0506
2008
Irving, M.Irving, M.Canadian diamond industry - the future. Power point presentation... places and concepts... not much in info.Israel Diamond Industry Conference, 17p. ppt.CanadaBrief overview - diamond industry
DS200812-0507
2008
Irving, M.Irving, M.Made in Canada: Diamonds North.Idex Magazine, Sept. 7, 3p.Canada, NunavutNews item - Diamonds North
DS200812-0508
2008
Irving, M.Irving, M.No pain, no gain - this must be the pain.Idex Magazine, Nov. 8, 2p.GlobalNews item - Shear Minerals
DS200912-0329
2009
Irving, M.Irving, M.Irving's theories of evolution. Argyle, Canada, beneficiation, supplier of choice, synthetics and conflict diamonds have had impact - change and evolveDiamonds in Canada Magazine, Northern Miner, June, pp. 6-9.GlobalEconomics
DS201112-0466
2011
Irving, M.Irving, M.Will Japan's disaster derail the diamond industry?Diamonds in Canada Magazine, Northern Miner, May p. 11.GlobalNews item - economics
DS201112-0467
2010
Irving, M.Irving, M.Shear moxie: Jericho purchase marks a change in strategy for Shear Minerals.Diamonds in Canada Magazine, Northern Miner, Nov. pp. 6-9.Canada, NunavutNews item - Shear
DS201212-0331
2012
Irving, M.Irving, M.Diamonds: as good as gold for investors?Diamonds in Canada Magazine, Northern Miner, May pp. 10-12.GlobalEconomics - funds
DS1989-0688
1989
Irving, R.Irving, R.Structural interpretation of GLIMPCE seismic reflection Line B, northeastern Lake SuperiorBsc. Thesis, University Of Toronto, 33pOntarioTectonics, Geophysics-seismics GLIMP
DS1993-0722
1993
Irving, R.Irving, R., et al.Lithoprobe Abitibi-Grenville seismic refraction survey: acquisition and processing reportGeological Survey of Canada, Open file, No. 2627, 322pOntarioGeophysics -seismic lithoprobe, Open File -ad
DS1990-1597
1990
Irvingm A.J.Xianyu Xue, Baadsgard, H., Irvingm A.J., Scarfe, C.S.Geochemical and isotopic characteristics of lithospheric mantle beneath West Kettle River British Columbia: evidence from ultramafic xenoliths #1Eos, Vol. 71, No. 28, July 10, p. 824. AbstractBritish ColumbiaMantle, Xenolith
DS1991-1247
1991
Irvingm A.J.O'Brien, H.E., Irvingm A.J., McCallum, J.S.Eocene potassic magmatism in the Highwood Mountains, Montana: petrology, geochemistry and tectonic implicationsJournal of Geophysical Research, Vol. 96, No. B8, July 30, pp. 13, 237-13, 260MontanaHighwood Mountains, Alkaline rocks
DS1990-0482
1990
Irwin, B.J.Folger, 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
Irwin, B.J.Folger, 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
DS1992-1492
1992
Irwin, D.Stubley, M., Irwin, D.Geological insights from the Squalus Lake aea north central NTS 85pNorthwest Territories, Preprint from PDA., 2pNorthwest TerritoriesSqualus Lake, Brief overview
DS201012-0192
2010
Irwin, D.Falck, H., Gochnauer, K., Irwin, D.2010 Northwest Territories mineral exploration overview.Northwest Territories Geoscience Office, Nov. 28, 21p.Canada, Northwest Territoriesdiamonds pp. 8-10.
DS1960-0461
1964
Irwin, W.P.Irwin, W.P.Late Mezozoic Orogenies in the Ultramafic Belts of Northwestern California and Southwestern Oregon.United States Geological Survey (USGS) PROF. PAPER., No. 501 C, PP. C1-C9.United States, California, Oregon, West Coast, Rocky MountainsBlank
DS201906-1325
2019
Isaac, C.Mole, D.R., Kirkland, C.L., Fiorentinim M.L., Barnes, S.J., Cassidy, K.F., Isaac, C., Belousova, E.A., Hartnady, M., Thebaud, N.Time space evolution of an Archean craton: a Hf-isotope window into continent formation. YilgarnEarth Science Reviews, https://doi.org/10.1016/j.earscrev.2019.05.03Australiacraton

Abstract: The Yilgarn Craton of Western Australia represents one of the largest pieces of Precambrian crust on Earth, and a key repository of information on the Meso-Neoarchean period. Understanding the crustal, tectonic, thermal, and chemical evolution of the craton is critical in placing these events into an accurate geological context, as well as developing holistic tectonic models for the Archean Earth. Here, we present a large U-Pb (420 collated samples) and Hf isotopic (2163 analyses) dataset on zircon, and apply it to constrain the evolution of the craton. These data provide strong evidence for a Hadean-Eoarchean origin for the Yilgarn Craton from mafic crust at ca. 4000?Ma, in a proto-craton consisting of the Narryer and north-central Southern Cross Domain. This ancient cratonic nucleus was subsequently rifted, expanded and reworked by successive crustal growth events at ca. 3700?Ma, ca. 3300?Ma, 3000-2900?Ma, 2825-2800?Ma, and ca. 2730-2620?Ma. The <3050?Ma crustal growth events correlate broadly with known komatiite events, and patterns of craton evolution, revealed by Hf isotope time-slice mapping, image the periodic break-up of the Yilgarn proto-continent and the formation of rift-zones between the older crustal blocks. Crustal growth and new magmatic pulses were focused into these zones and at craton margins, resulting in continent growth via internal (rift-enabled) expansion, and peripheral (crustal extraction at craton margins) magmatism. Consequently, we interpret these major geodynamic processes to be analogous to plume-lid tectonics, where the majority of tonalite-trondhjemite-granodiorite (TTG) felsic crust, and later granitic crust, was formed by reworking of hydrated mafic rocks and TTGs, respectively, via a combination of infracrustal and/or drip-tectonic settings. We argue that subduction-like processes formed a minor tectonic component, re-docking the Narryer Terrane to the craton at ca. 2740?Ma. Overall, these processes led to an intra-cratonic architecture of younger, juvenile terranes located internal and external to older, long-lived, reworked crustal blocks. This framework provided pathways that localized later magmas and fluids, driving the exceptional mineral endowment of the Yilgarn Craton.
DS200512-1069
2004
Isaac, T.Taplin, R., Isaac, T.Comments on Canada's National Diamond Strategy.Journal of Energy and Natural Resources Law, Vol. 22, 4, pp. 429-449. Ingenta 1045638748Canada, Northwest TerritoriesNews item - legal
DS1993-0589
1993
Isaacks, B.L.Gubbels, T.L., Isaacks, B.L., Farrar, E.High level surfaces, plateau uplift, and foreland development, Bolivian central AndesGeology, Vol. 21, No. 8, August pp. 695-698BoliviaTectonics, San Juan Del Oro surface
DS1996-1535
1996
Isaacks, B.L.Whitman, D., Isaacks, B.L., Kay, S.M.Lithospheric structure and along strike segmentation of the Central AndeanPlateau: seismic Q, magmatism...Tectonophysics, Vol. 259, No. 1-3, June 30, pp. 29-40Andes, Cordillera, Bolivia, ArgentinaSubduction, Tectonics
DS2001-1119
2001
Isaak, D.G.Stacey, F.D., Isaak, D.G.Compositional constraints on the equation of state and thermal properties of the lower mantle.Geophys. Journal of International, Vol. 146, No. 1, pp. 143-54.MantleGeothermometry
DS200712-0466
2007
Isaak, D.G.Isaak, D.G., Gwanmesia, G.D., Falde, D., Davis, M.G., Triplett, R.S., Wang, L.The elastic properties of b-Mg2SiO4 from 295 to 660K and implications on the composition of Earth's upper mantle.Physics of the Earth and Planetary Interiors, Vol. 162, 1-2, pp. 22-31.ChinaPerovskite
DS200712-0467
2007
Isaak, D.G.Isaak, D.G., Gwanmesia, G.D., Falde, D., Davis, M.G., Triplett, R.S., Wang, L.The elastic properties of b-Mg2SiO4 from 295 to 660K and implications on the composition of Earth's upper mantle.Physics of the Earth and Planetary Interiors, Vol. 162, 1-2, pp. 22-31.ChinaPerovskite
DS1989-0689
1989
Isaaks, E.H.Isaaks, E.H., Srivastava, R.M.Applied geostatisticsOxford University Press, 560p. Paperback approx.$35.00BookGeostatistics, Sampling data sets
DS1991-1578
1991
Isaaks, E.H.Shurtz, R.F., Srivastava, R.M., Isaaks, E.H.Comment and reply on the paper "study of probabilistic and deterministicgeostatistics"Mathematical Geology, Vol. 23, No. 3, April pp. 443-480. pp. 481-497GlobalGeostatistics, Probablilistic
DS1984-0582
1984
Isabel, B.Pereira, M., Estela, J.M., Isabel, B., Thomaz, M.F.Slow Transitions in Diamond: the Photoluminescence S//1 Centre.Journal of LUMINESCENCE., Vol. 31-32, PT. 1-2, Dec. PP. 179-181.GlobalExperimental Research
DS1993-0148
1993
IsachsenBowring, S.A., Housh, T.B., Isachsen, Hilebrand, R.S.What do we know about the western limit of the Slave craton?Northwest Territories Exploration Overview for 1993, November p. 24.Northwest TerritoriesCraton, Slave Craton
DS1989-0156
1989
Isachsen, C.E.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
DS1991-0252
1991
Isachsen, C.E.Chamberlain, K.R., Frost, B.R., Patel, S.C., Isachsen, C.E.New uranium-lead (U-Pb) (U-Pb) geochronological and thermobarometric constraints on Proterozoic tectonic processes along the southeast margin of the Wyoming cratonGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 59WyomingGeochronology, Tectonics
DS1994-0811
1994
Isachsen, C.E.Isachsen, C.E., Bowring, S.A.Evolution of the Slave CratonGeology, Vol. 22, No. 10, October pp. 917-920Northwest TerritoriesTectonics, Slave craton
DS1994-0812
1994
Isachsen, C.E.Isachsen, C.E., Bowring, S.A.Evolution of the Slave cratonGeology, Vol. 22, No. 10, October pp. 917-920.Northwest TerritoriesTectonics, Slave craton
DS1995-0855
1995
Isachsen, C.E.Isachsen, C.E., Bowring, S.A.Archean arc-continent collision in Slave structural province or not?Eos, Vol. 76, No. 46, Nov. 7. p.F602. Abstract.Northwest TerritoriesTectonics, Crust -geodynamics
DS1997-0544
1997
Isachsen, C.E.Isachsen, C.E., Bowring, S.A.The Bell Lake group and Anton Complex: a basement cover sequence beneath the Archean Yellowknife belt..Canadian Journal of Earth Sciences, Vol. 34. No. 2, Feb. pp. 169-189Northwest TerritoriesGreenstone belt formation, Geochronology Slave Province
DS1997-0545
1997
Isachsen, Y.W.Isachsen, Y.W., Gerhard, D.A., Hurowitz, J.Digital map of Adirondack dikesGeological Society of America (GSA) Abstracts, Vol. 29, No. 1, March 17-19, p. 54.GlobalDikes
DS1990-1374
1990
Isacks, B.L.Smalley, R. Jr., Isacks, B.L.Seismotectonics of thin and thick skinned deformation in the Andean Foreland from local network data: evidence for a seismogenic lower crustJournal of Geophysical Research, Vol. 95, No. B8, August 10, pp. 12, 487- 12, 498AndesGeophysics - seismics, Tectonics
DS1997-0021
1997
Isacks, B.L.Allmendinger, R.W., Jordan, T.E., Kay, S.M., Isacks, B.L.The evolution of the Altiplano-Puna Plateau of the Central AndesAnnual Review of Earth and Planetary Sciences, Vol. 25, pp. 139-174Andes, Bolivia, BrazilReview - plateau, Tectonics, stratigraphy
DS201412-0823
2014
Isaenko, S.Shumilova, T., Kis, K.V., Masaitis, V., Isaenko, S., Makeev, B.Onion-like carbon in impact diamonds from the Popigai astrobleme.European Journal of Mineralogy, Vol. 26, 2, pp. 267-277.RussiaLonsdaleite, raman spectroscopy
DS201908-1816
2019
Isaenko, S.Shumilova, T., Isaenko, S.Nanoporous nanocrystalline impact diamonds. Popigai astroblemeMineralogy and Petrology, in press available doi.org/10.1007/ s00710-019-00671-1 10p.Russiaimpact diamonds

Abstract: Complementary nano- and atomic-scale data from SEM, FIB, HRTEM, and EELS observations of after-coal impact diamonds from the giant Kara astrobleme are described, presenting their particular nano-sized porous polycrystalline structure, which consists of well-shaped single 20-30 nm nanocrystals that are free of deformation defects and do not contain lonsdaleite. The porous micro- and nanostructure is a special typomorphic feature of after-coal diamonds that suggests a crystallisation mechanism through short distance diffusion. The data for the after-coal impact diamonds presented here demonstrate their distinguishing characteristics from after-graphite impact diamonds, and have some similarity with the enigmatic carbonado, providing new insights to the origin of the latter
DS201909-2088
2019
Isaenko, S.Shumilova, T., Isaenko, S.Nanoporous nanocrystalline impact diamonds.Mineralogy and Petrology, in press available 10p. PdfGlobalastrobleme

Abstract: Complementary nano- and atomic-scale data from SEM, FIB, HRTEM, and EELS observations of after-coal impact diamonds from the giant Kara astrobleme are described, presenting their particular nano-sized porous polycrystalline structure, which consists of well-shaped single 20-30 nm nanocrystals that are free of deformation defects and do not contain lonsdaleite. The porous micro- and nanostructure is a special typomorphic feature of after-coal diamonds that suggests a crystallisation mechanism through short distance diffusion. The data for the after-coal impact diamonds presented here demonstrate their distinguishing characteristics from after-graphite impact diamonds, and have some similarity with the enigmatic carbonado, providing new insights to the origin of the latter.
DS2000-0600
2000
Isaenko, S.I.Lyutoev, V.P., Glukhov, Y.V., Isaenko, S.I.Epigene nitrogen defects and metallic films on the surface of diamonds from the middle Timan region.Doklady Academy of Sciences, Vol. 375, No. 8, Oct. Nov. pp. 1251-54.Russia, TimanDiamond - morphology
DS201012-0313
2010
Isaenko, S.I.Isaenko, S.I., Shumilova, T.G., Divaev, F.K.Morphological and spectroscopic features of microdiamond from Chatatay carbonatites ( Uzbekistan).International Mineralogical Association meeting August Budapest, abstract p. 570.Russia, UzbekistanDiamond genesis
DS201512-1932
2015
Isaenko, S.I.Isaenko, S.I., Shumilova, T.G., Shevchuk, S.S.Carbon matter in kimberlite rocks of the Charteskii Complex ( Subpolar Urals).Doklady Earth Sciences, Vol. 464, 2, pp. 1062-1065.RussiaCarbon

Abstract: Results of the study of carbon material (CM) discovered in kimberlite-like rocks of the Charteskii Complex (Subpolar Urals) are considered. It is shown that CM is represented by partially oxidized graphite and optically transparent amorphous CM (presumably diamond-like carbon). The data obtained are important for estimation of the diamond potential of this object, as well as for understanding of the new mechanism of the formation of diamond-like carbon and diamond.
DS201602-0238
2015
Isaenko, S.I.Shumilova, T.G., Isaenko, S.I., Tkachev, S.N.Diamond formation through metastable liquid carbon.Diamond and Related Materials, in press availableTechnologyDiamond formation

Abstract: It is known that carbon melts at temperatures around 4000 K or higher, and, therefore, this will be for the first time, when liquid carbon state formation preserved within diamond is documented in a carbon-carbonate system at the PT-conditions around 8.0 GPa and 2000 K, that is essentially far from the carbon diagram liquid field, so the newly reported liquid carbon was formed by neither fusion nor condensation. Based on a preponderance of such a strong circumstantial evidence, as morphological features of globular glass-like carbon inclusions within the globular-textured host diamond crystals resulting from liquid segregation process under synthesis conditions, it is suggested, that the produced carbon state has general properties of liquid and is formed through agglomeration alongside with diffusion process of carbon within carbonate melt solvent, and, thus, can potentially open a novel route for liquid carbon production and manufacturing of advanced high-refractory alloys and high-temperature compounds at lower than commonly accepted standard temperatures. A new model of diamond formation via metastable liquid carbon is presented.
DS201603-0421
2016
Isaenko, S.I.Shumilova, T.G., Isaenko, S.I., Tkachev, S.N.Diamond formation through metastable liquid carbon.Diamond and Related Materials, Vol. 62, pp. 42-48.TechnologyCarbon

Abstract: It is known that carbon melts at temperatures around 4000 K or higher, and, therefore, this will be for the first time, when liquid carbon state formation preserved within diamond is documented in a carbon-carbonate system at the PT-conditions around 8.0 GPa and 2000 K, that is essentially far from the carbon diagram liquid field, so the newly reported liquid carbon was formed by neither fusion nor condensation. Based on a preponderance of such a strong circumstantial evidence, as morphological features of globular glass-like carbon inclusions within the globular-textured host diamond crystals resulting from liquid segregation process under synthesis conditions, it is suggested, that the produced carbon state has general properties of liquid and is formed through agglomeration alongside with diffusion process of carbon within carbonate melt solvent, and, thus, can potentially open a novel route for liquid carbon production and manufacturing of advanced high-refractory alloys and high-temperature compounds at lower than commonly accepted standard temperatures. A new model of diamond formation via metastable liquid carbon is presented.
DS201806-1251
2018
Isaenko, S.I.Shunilova, T.G., Isaenko, S.I., Ulyashev, V.V., Kazakov, V.A., Makeev, B.A.After coal diamonds: an enigmatic type of impact diamonds. Kara astrobleme ( Pay-Khoy)European Journal of Mineralogy, Vol. 30, 1, pp. 61-76.Russiameteorites

Abstract: Impact diamonds were discovered in the 70s and are usually accepted as being paramorphs after graphite, resulting in grains of extremely high mechanical quality. A diffusion-less mechanism for the graphite-to-diamond transition under huge pressure has been experimentally realized and theoretically explained. Besides, another type of impact product has received much less attention, namely diamonds formed after coal as a result of the impact. Here we describe after-coal impact diamonds from the giant Kara astrobleme (Pay-Khoy, Russia), which resulted from a large asteroid impact about 70?Ma ago. The impact created a large number of unusual impact diamonds, which are described here for the first time using high-resolution techniques including visible and UV Raman spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM). Two main varieties of after-coal diamonds occur: micrograined (sugar-like, subdivided into coherent and friable) and, as a new type, paramorphs after organic relics. After-coal diamonds differ from after-graphite impact diamonds by the texture, the absence of lonsdaleite, a micro- and nanoporous structure. The sugar-like variety consists of tightly aggregated, well-shaped single nanocrystals. The after-organic diamond paramorphs are characterized by a well-preserved relict organic morphology, sub-nanocrystalline-amorphous sp3-carbon (ta-C) nanocomposites and other specific properties (optical transparence, brown color, very high luminescence, spectral features). Based on the description of after-coal diamonds, we propose a new, polystage formation mechanism: high-velocity coal pyrolysis with hetero-elements removal followed by diffusion-limited crystallization of pure carbon. The similarity of the after-coal diamonds features with carbonado is a strong piece of evidence in support of the impact hypothesis for the origin of carbonado.
DS201809-2087
2018
Isaenko, S.I.Shumilova, T.G., Ulyashev, V.V., Isaenko, S.I.A new type of impact diamonds: diamond paramorphs after wood relics. Kara astrobleme ( Pay-Khoy)81st Annual Meeting of the Meteoritical Society 2018, LPI contribution No. 2067, 1p. AbstractRussiadiamond - impact

Abstract: Impact diamonds are known as high quality technical material [1]. Usually they are formed by graphite-to-diamond solid-phase diffuse-less transition at shock pressures > 30 GPa. The diffuse-less mechanism had been proven by numerous experimental studies [2]. But impact diamond formation is possible from non-graphitic precur-sor too, from amorphous carbons and bitumenes, while the process is rare known and slightly studied. In the nature not only graphite of metamorphic rocks but sedimentary organic matter containing rocks can be treated by impact processes resulting by high pressure phases up to after-coal diamond formation [3]. The only two astroblemes with after-coal diamonds have been found by present - the giant Kara and Ust`-Kara astroblemes with 65 and 25 km in diameters correspondently [1, 3]. The novel data on impact diamonds and impact objects are very actual since the practical interest to impact diamonds last time is rising [4, 5]. Here we present the after-coal diamonds features including a new impact diamond variety (Fig. 1) presented by after-organics diamond paramorphs first time found at the Kara astrobleme (Pay-Khoy, Russia) [6]. The paramorphs are characterized with perfectly preserved micromorphology of the wood relics being composed of pure carbon content with polynanocrystalline structure has been proven with Raman spectroscopy, transmission electron microscopy, atomic force microscopy and other modern methods. The received data on after-coal diamonds point to their formation by low-distance diffuse mechanism described for low ordered carbons by Borimchuk et al. [7]. The received data allow to present a new impact diamond variety widely spread through the Kara astrobleme counting huge concentrations - up to several thousand carat per ton [6]. The proposed novel mechanism of impact diamonds formation is characterized with several stages including high pressure high temperature fast pyrolysis with the precursor carbonization co-followed with diamond crystallization through low-distance diffuse mechanism [6]. The provided study allow suppose possibility of wide distribution of impact diamonds formed after noncrystalline carbons and organics of sedimentary objects at large impact craters around the world.
DS200712-0468
2007
Isaev, E.I.Isaev, E.I., Skorodumova, N.V., Ahuja, R., Vekilov, Y.K., Johansson, B.Dynamical stability of Fe-H in the Earth's mantle and core regions.Proceedings of National Academy of Sciences USA, Vol. 104, 22, pp. 9168-9177. IngentaMantleChemistry
DS1975-0634
1977
Isaev, G.A.Surkov, V.S., Isaev, G.A., Rempel, G.G.Transient Processes Method (tpm) in Prospecting for Deep Conductive Ore Bodies in Siberia.Soviet Geology GEOPHYS., Vol. 18, No. 7, PP. 6-12.RussiaKimberlite, Geophysics
DS1992-1211
1992
Isaichkin, A.A.Plaksenko, A.N., Girnis, A.V., Isaichkin, A.A., Frolov, S.M.A harzburgite xenolith from the Voronezh crystalline massif PrecambriannoritesGeochemistry International, Vol. 29, No. 2, pp. 146-RussiaXenolith, Harzburgite
DS1993-0723
1993
Isaichkin, A.A.Isaichkin, A.A., Plaksenko, A.N., Girnis, A.V.Petrology of harzburgite xenoliths from Voronezh crystalline massif norite-diorite intrusions.Geochemistry International, Vol. 30, No. 8, pp. 66-76.RussiaXenoliths
DS1995-0138
1995
Isakov, A.L.Beloborodov, V.H., Isakov, A.L., Kramshov, N.P., Sher, E.N.Behaviour of crystals in kimberlite and ice under the action of shockwaves.Journal of Min. Science, Vol. 31, No. 2, Mar-Apr. pp. 109-113. #TB408RussiaKimberlite petrography
DS201312-0995
2013
Isakova, A.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
DS201612-2326
2016
Isakova, A.T.Panina, L.I., Rokosova, E.Yu., Isakova, A.T., Tolstov, A.V.Lamprophyres of the Tomto Massif: a result of mixing between potassic and sodic alkaline mafic magmas.Petrology, Vol. 24, 6, pp. 608-625.RussiaAlkalic
DS201712-2715
2017
Isakova, A.T.Panina, L.I., Rokosova, E.Yu., Isakova, A.T., Tolstov, A.V.Mineral composition of alkaline lamprophyres of the Tomto massif as reflection of their genesis.Russian Geology and Geophysics, Vol. 58, pp. 887-902.Russiamonchiquites
DS2000-0434
2000
Isanina, E.V.Isanina, E.V., Verba, M.L., Ivanova, N.M., KazanskyDeep structure and seismogeological boundaries of the Pechenga District, Baltic Shield -Geol. Ore Dep., Vol. 42, No. 5, pp. 429-39.Russia, Baltic ShieldTectonics, seismics
DS200512-0904
2004
Isbrodin, L.A.Ripp, G.S., Badmatsyrenov, M.V., Doroshkevich, A.G., Isbrodin, L.A.Mineral composition and geochemical characteristic of the Veseloe carbonatites ( Northern Transbaikalia, Russia).Deep seated magmatism, its sources and their relation to plume processes., pp. 257-272.RussiaCarbonatite, mineralogy
DS2001-0192
2001
IshbulatovChudinovskikh, L.T., Zharikov, Ishbulatov, MatveevMechanisms of high pressureotassium content in corporation into high pressure clinopyroxeneDoklady Academy of Sciences, Vol. 381, No. 8, Oct/Nov. pp. 956-9.GlobalMineralogy
DS1984-0797
1984
Ishbulatov, R.A.Zharikov, V.A., Ishbulatov, R.A., Chudinovskikh, L.T.Eclogite Barrier and Clinopyroxenes of High PressuresGeology And Geophysics, No. 12, DECEMBER PP.RussiaMineralogy
DS1990-0745
1990
Ishbulatov, R.A.Ishbulatov, R.A., Kosyakov, A.V., Zharikov, V.A. editor.Experimental studies of problems with lamproite magma generation.(Russian)Akad. Nauk SSSR Institute Eksp. Mineral. Chernogolovka, Sun., in: Experiment, pp. 30-32RussiaLamproite, Genesis
DS1995-0856
1995
Ishbulatov, R.A.Ishbulatov, R.A.Experimental investigation on the interaction of carbonate melts with Upper mantle rocks.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 252-253.MantleCarbonates, Petrology -experimental
DS2002-1004
2002
Isherskaya, M.V.Maslov, A.V., Isherskaya, M.V.Riphean sedimentary sequences of the eastern and northeastern margins of the Eastern European Craton.Russian Journal of Earth Science, Vol. 4, 4, AugustEurope, Asia, RussiaCraton
DS201911-2534
2019
Ishi, T.Ishi, T., Huang, R., Myhill, R., Fei, H., Koemets, I., Liu, Z., Maeda, F., Yuan, L., Wang, L., Druzhbin, D., Yamamoto, T., Bhat, S., Farla, R., Kawazoe, T., Tsujino, N., Kulik, E., Higo, Y., Tange, H., Katsura, T.Sharp 660 km discontinuity controlled by extremely narrow binary post-spinel transition.Nature Geosciences, Vol. 12, pp. 869-872.Mantlediscontinuity

Abstract: The Earth’s mantle is characterized by a sharp seismic discontinuity at a depth of 660?km that can provide insights into deep mantle processes. The discontinuity occurs over only 2?km—or a pressure difference of 0.1?GPa—and is thought to result from the post-spinel transition, that is, the decomposition of the mineral ringwoodite to bridgmanite plus ferropericlase. Existing high-pressure, high-temperature experiments have lacked the pressure control required to test whether such sharpness is the result of isochemical phase relations or chemically distinct upper and lower mantle domains. Here, we obtain the isothermal pressure interval of the Mg-Fe binary post-spinel transition by applying advanced multi-anvil techniques with in situ X-ray diffraction with the help of Mg-Fe partition experiments. It is demonstrated that the interval at mantle compositions and temperatures is only 0.01?GPa, corresponding to 250?m. This interval is indistinguishable from zero at seismic frequencies. These results can explain the discontinuity sharpness and provide new support for whole-mantle convection in a chemically homogeneous mantle. The present work suggests that distribution of adiabatic vertical flows between the upper and lower mantles can be mapped on the basis of discontinuity sharpness.
DS201112-1130
2011
Ishibashi, H.Yamamoto, J., Kurz, M.D., Ishibashi, H., Curtice, J.Noble gas isotopic composition of mantle xenoliths in a kimberlite.Goldschmidt Conference 2011, abstract p.2201.Russia, SiberiaKimberlite magma
DS201212-0332
2012
Ishibashi, H.Ishibashi, H., Kagi, H., Sakuai, H., Ohfuji, H., Sumino, H.Hydrous fluid as the growth media of natural polycrystalline diamond, carbonado: implication from IR spectra and microtextural observations.American Mineralogist, Vol. 97, pp. 1366-1372.Africa, Central African RepublicCarbonado
DS201412-0436
2014
Ishibashi, H.Kagi, H., Ishibashi, H., Zedgenizov, D., Shatsky, V., Ragozin, A.Growth condition of super-deep diamonds inferred from carbon isotopic compositions and chemical compositions of nano-inclusions.Goldschmidt Conference 2014, 1p. AbstractMantleMineral chemistry
DS201611-2117
2016
Ishibashi, H.Kagi, H., Zedgenizov, D.A., Ohfuji, H., Ishibashi, H.Micro- and nano-inclusions in a superdeep diamond from Sao Luiz, Brazil.Geochemistry International, Vol. 54, 10, pp. 834-838.South America, BrazilDeposit - Sao Luiz

Abstract: We report cloudy micro- and nano-inclusions in a superdeep diamond from São-Luiz, Brazil which contains inclusions of ferropericlase (Mg, Fe)O and former bridgmanite (Mg, Fe)SiO3 and ringwoodite (Mg, Fe)2SiO4. Field emission-SEM and TEM observations showed that the cloudy inclusions were composed of euhedral micro-inclusions with grain sizes ranging from tens nanometers to submicrometers. Infrared absorption spectra of the cloudy inclusions showed that water, carbonate, and silicates were not major components of these micro- and nano-inclusions and suggested that the main constituent of the inclusions was infrared-inactive. Some inclusions were suggested to contain material with lower atomic numbers than that of carbon. Mineral phase of nano- and micro-inclusions is unclear at present. Microbeam X-ray fluorescence analysis clarified that the micro-inclusions contained transition metals (Cr, Mn, Fe, Co, Ni, Cu, Zn) possibly as metallic or sulfide phases. The cloudy inclusions provide an important information on the growth environment of superdeep diamonds in the transition zone or the lower mantle.
DS201906-1315
2019
Ishibashi.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.
DS201506-0292
2015
Ishida, A.Pinti, D., Ishida, A., Takahata, N., Sano, Y.Carbon isotopes in a Juin a diamond with carbonate inclusions.Japan Geoscience Union Meeting, SCG16-05 May 28 abstractSouth America, BrazilDeposit - Juina
DS2003-0624
2003
Ishida, H.Ishida, H., Ogasawara, Y., Ohsumi, K., Saito, A.Two stage growth of microdiamond in UHP dolomite marble from Kokechtav MassifJournal of Metamorphic Geology, Vol. 21, 6, pp. 515-22.Russia, KazakhstanMicrodiamonds - morphology
DS200412-0876
2003
Ishida, H.Ishida, H., Ogasawara, Y., Ohsumi, K., Saito, A.Two stage growth of microdiamond in UHP dolomite marble from Kokechtav Massif, Kazakhstan.Journal of Metamorphic Geology, Vol. 21, 6, pp. 515-22.Russia, KazakhstanMicrodiamonds - morphology
DS200412-1716
2004
Ishida, H.Sachan, H.K., Mukherjee, B.K., Ogasawara, Y., Mauyama, S., Ishida, H., Muko, A., Yoshioka, N.Discovery of coesite from Indus Suture Zone (ISZ) Ladakh India: evidence for deep subduction.European Journal of Mineralogy, Vol. 16, 2, pp. 235-240.IndiaSubduction
DS200712-0863
2007
Ishida, Y.Python, M., Ceuleneer, G., Ishida, Y., Barrat, J-A., Arai, S.Oman diopsidites: a new lithology diagnostic of very high temperature hydrothermal circulation in mantle peridotite below oceanic spreading centres.Earth and Planetary Science Letters, Vol. 255, 3-4, March 30, pp. 289-305.Europe, OmanPeridotite
DS200712-0864
2007
Ishida, Y.Python, M., Ishida, Y., Ceuleneer, G., Arai, S.Trace element heterogeneity in hydrothermal diopside: evidence for Ti depletion and Sr Eu LREE enrichment during hydrothermal metamorphism of mantle harzburgite.Journal of Mineralogical and Petrological Sciences, Vol. 102, 2, pp. 143-149.MantleHarzburgite
DS1993-1772
1993
Ishihara, S.Wu Chengyu, Ge Bai, Zhongxin Yuan, Nakajima, T., Ishihara, S.Proterozoic metamorphic rock hosted Zirconium, Yttrium and heavy rare earth elements (HREE) mineralization in the Dabie Mountain area.International Geology Review, Vol. 35, No. 9, pp. 898-919.ChinaCarbonatite, Rare earth
DS200612-0626
2006
Ishihara, S.Ishihara, S., Ohmoto, H., Anhaeusser, C.R., Imai, A., Robb, L.J.Discovery of the oldest oxidized granitoids in the Kaapvaal Craton and its implications for the redox evolution of early Earth.Geological Society of America Memoir, No. 198, pp. 67-80.Africa, South AfricaRedox
DS2003-0673
2003
Ishihara, T.Joseph, E.J., Segawa, J., Kusumoto, S., Nakayama, E., Ishihara, T., KomazawaAirborne gravimetry - a new gravimeter system and test resultsExploration Geophysics, Vol. 34, 1-2, pp. 82-86.GlobalGeophysics - gravimetry not specific to diamonds
DS200412-0601
2004
Ishihara, T.Gaina, C., Muller, R.D., Brown, B.J., Ishihara, T.Microcontinent formation around Australia.Hillis, R.R., Muller, R.D. Evolution and dynamics of the Australian Plate, Geological Society America Memoir, No. 372, pp. 405-416.AustraliaTectonics
DS200412-0932
2003
Ishihara, T.Joseph, E.J., Segawa, J., Kusumoto, S., Nakayama, E., Ishihara, T., Komazawa, M., Sakuma, S.Airborne gravimetry - a new gravimeter system and test results.Exploration Geophysics, Vol. 34, 1-2, pp. 82-86.TechnologyGeophysics - gravimetry not specific to diamonds
DS2002-1175
2002
IshiiO'Hara, Y., Stern, Ishii, Yurimoto, YamazakiPeridotites from the Mariana Trough: first look at the mantle beneath an active back-arc basin.Contribution to Mineralogy and Petrology, Vol.143,1,pp.1-18., Vol.143,1,pp.1-18.Mariana TroughPeridotites
DS2002-1176
2002
IshiiO'Hara, Y., Stern, Ishii, Yurimoto, YamazakiPeridotites from the Mariana Trough: first look at the mantle beneath an active back-arc basin.Contribution to Mineralogy and Petrology, Vol.143,1,pp.1-18., Vol.143,1,pp.1-18.Mariana TroughPeridotites
DS1999-0326
1999
Ishii, M.Ishii, M., Tromp, J.Normal mode and free air gravity constraints on lateral variations in velocity and density of Earth's mantle.Science, Vol. 285, No. 5431, Aug. 20, pp. 1231-5.MantleGeophysics - gravity
DS200412-0877
2004
Ishii, M.Ishii, M., Tromp, J.Constraining large scale mantle heterogeneity using mantle and inner core sensitive normal modes.Physics of the Earth and Planetary Interiors, Vol. 146, 1-2, pp. 113-124.MantleGeochemistry
DS200512-0886
2005
Ishii, M.Pysklywec, R.N., Ishii, M.Time dependent subduction dynamics driven by the instability of stagnant slabs in the transition zone.Physics of the Earth and Planetary Interiors, Vol. 149, 1-2, March 15, pp.115-132.MantleSubduction
DS1985-0575
1985
Ishii, T.Ryabchik, I.D., Ukhanov, A.V., Ishii, T.Redox equilibration temperatures in the Ultramafic Rocks from the Upper Mantle of the Yakutian Kimberlite Province.Geochimiya., No. 8, AUGUST PP. 1110-1123.Russia, YakutiaPetrology
DS1986-0691
1986
Ishii, T.Ryabchikov, I.D., Ukanov, A.V., Ishii, T.Redox equilibration temperatures in upper mantle ultrabasites in the YakutiakimberliteprovinceGeochemistry International, Vol. 23, No. 2, pp. 38-50RussiaMantle
DS1986-0692
1986
Ishii, T.Ryabchikov, I.D., Ukranov, A.V., Ishii, T.Redoc equilibration temperatures in upper mantle ultrabasites in the YakutiakimberliteprovinceGeochemistry International, Vol.23, No. 2, pp. 38-50RussiaPetrology, Ultrabasites
DS1990-0746
1990
Ishii, T.Ishii, T., Robinson, P.T., Fiske, R.Petrology of ODP LED 125: mantle peridotites And related rocks from serpentine diapiric seamounts in the IZU-Ogasawara-Mariana forearcGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Vancouver 90 Program with Abstracts, Held May 16-18, Vol. 15, p. A63. AbstractOceanMantle, Peridotites
DS201212-0333
2012
Ishii, T.Ishii, T., Kojitani, H., Akaogi, M.High pressure phase transitions and subduction behaviour of continent crust at pressure temperature conditions up to the upper part of the lower mantle.Earth and Planetary Science Letters, Vol. 357-358, pp. 31-41.MantleSubduction
DS201802-0218
2018
Ishii, T.Akaogi, M., Kawahara, A., Kojitani, H., Yoshida, K., Anegawa, Y., Ishii, T.High pressure phase transitions in MgCr2O4 MgSiO4 composition: reactions between olivine and chromite with implications for ultrahigh pressure chromitites.American Mineralogist, Vol. 103, pp. 161-170.Mantlechromites
DS201012-0322
2010
IshikawaJanney, P.E., Shirey, S.B., Carlson, R.W., Pearson, D.G., Bell, D.R., Le Roex, A., Ishikawa, Nixon, BoydAge, composition and thermal characteristics of South African off craton mantle lithosphere: evidence for a multi stage history.Journal of Petrology, Vol. 51, 9, pp. 1849-1890,Africa, South AfricaGeochronology, geothermometry
DS200912-0330
2009
Ishikawa, A.Ishikawa, A., Pearson, D.G., Dale, C.W.Re Os isotopes and platinum group elements in a peridotite pyroxenite hydrid mantle.Goldschmidt Conference 2009, p. A572 Abstract.MantleMagmatism
DS201212-0546
2012
Ishikawa, A.Pearson, D.G., Mather, K.A., Ishikawa, A., Kjarsgaard, B.A.Origin and evolution of cratonic roots.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractGlobalCraton
DS201212-0585
2012
Ishikawa, A.Riches, A.J.V., Pearson, D.G., Stern, R.A., Ickert, R.B., Kjarsgaard, B.A., Jackson, S.E., Ishikawa, A.Multi-stage metasomatism of a Roberts Victor eclogite linked to the formation and destruction of diamond.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, South AfricaDeposit - Roberts Victor
DS201601-0040
2015
Ishikawa, A.Riches, A.J.V., Ickert, R.B., Pearson, D.G., Stern, R.A., Jackson, S.E., Ishikawa, A.In situ oxygen isotope, major-, and trace element constraints on the metasomatic modification and crustal origin of a Diamondiferous eclogite from Roberts Victor, Kaapvaal Craton.Geochimica et Cosmochimica Acta, in press available, 45p.Africa, South AfricaDeposit - Roberts Victor
DS201603-0417
2016
Ishikawa, A.Riches, A.J.V., Ickert, R.B., Pearson, D.G., Stern, R.A., Jackson, S.E., Ishikawa, A., Kjarsgaard, B.A., Gurney, J.J.In situ oxygen-isotope, major, and trace element constraints on the metasomatic modification and crust origin of a Diamondiferous eclogite from Roberts Victor, Kaapvaal craton.Geochimica et Cosmochimica Acta, Vol. 174, pp. 345-359.Africa, South AfricaDeposit - Roberts Victor
DS201312-0430
2013
Ishikawa, S.T.Ishikawa, S.T., Gulick, V.C.An automated mineral classifer using Raman spectra. ( igneous rocks)Computers & Geosciences, Vol. 54, pp. 259-268.TechnologySpectral data
DS201412-0625
2014
Ishikawa, T.Nguyen Thi, T., Wada, H., Ishikawa, T., Shimano, T.Geochemistry and petrogenesis of carbonatites from South Nam Xe, Lai Chau area, northwest Vietnam.Mineralogy and Petrology, Vol. 108, 3, pp. 371-390.Asia, VietnamCarbonatite
DS201412-0929
2014
Ishikawa, T.Thi, T.N., Wada, H., Ishikawa, T., Shimano, T.Geochemistry and petrogenesis of carbonatites from south Nam Xe, Lai Chau area, northwest Vietnam.Mineralogy and Petrology, Vol. 108, pp. 371=390.Asia, VietnamCarbonatite
DS200712-0023
2007
Ishimaru, S.Arai, S., Abe, N., Ishimaru, S.Mantle peridotites from the Western Pacific.Gondwana Research, Vol. 11, 1-2, Jan. pp. 180-199.AsiaPeridotite
DS200812-0041
2008
Ishimaru, S.Arai, S., Ishimaru, S.Insights into petrological characteristics of the lithosphere of mantle wedge beneath arcs through peridotite xenoliths: a review.Journal of Petrology, Vol. 49, 4, pp. 665-695.MantleXenoliths - peridotite
DS200812-0509
2008
Ishimaru, S.Ishimaru, S., Arai, S.Nickel enrichment in mantle olivine beneath a volcanic front.Contributions to Mineralogy and Petrology, Vol. 156, 1, pp. 119-131.MantleNickel
DS201112-0025
2011
Ishimaru, S.Arai, S., Okamura, H., Kadoshima, K., Tanaka, C., Suzuki, K., Ishimaru, S.Chemical characteristics of chromian spinel in plutonic rocks: implications for deep magma processes and discrimination of tectonic setting.Island Arc, Vol. 20, 1, pp. 125-137.MantleMagmatism - tectonics
DS202008-1428
2020
Ishimaru, S.Nishiyama, T., Ohfuji, H., Fukuba, K., Terauchi, M., Nishi, U., Harada, K., Unoki, K., Moribe, Y., Yoshiasa, A., Ishimaru, S., Mori, Y., Shigeno, M., Arai, S.Microdiamond in a low grade metapelite from a Cretaceous subduction complex, western Kyushu, Japan. ( UHP) Nishisonogi unitNature Scientific Reports, Vol. 10, 11645 11p. PdfAsia, Japanmicrodiamond

Abstract: Microdiamonds in metamorphic rocks are a signature of ultrahigh-pressure (UHP) metamorphism that occurs mostly at continental collision zones. Most UHP minerals, except coesite and microdiamond, have been partially or completely retrogressed during exhumation; therefore, the discovery of coesite and microdiamond is crucial to identify UHP metamorphism and to understand the tectonic history of metamorphic rocks. Microdiamonds typically occur as inclusions in minerals such as garnet. Here we report the discovery of microdiamond aggregates in the matrix of a metapelite from the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan. The Nishisonogi unit represents a Cretaceous subduction complex which has been considered as an epidote-blueschist subfacies metamorphic unit, and the metapelite is a member of a serpentinite mélange in the Nishisonogi unit. The temperature condition for the Nishisonogi unit is 450 °C, based on the Raman micro-spectroscopy of graphite. The coexistence of microdiamond and Mg-carbonates suggests the precipitation of microdiamond from C-O-H fluid under pressures higher than 2.8 GPa. This is the first report of metamorphic microdiamond from Japan, which reveals the hidden UHP history of the Nishisonogi unit. The tectonic evolution of Kyushu in the Japanese Archipelago should be reconsidered based on this finding.
DS1990-1285
1990
Ishiwatari, A.Ruyuan Zhang, Hirajima, T., Banno, S., Ishiwatari, A., Jiaju Li, BolinCoesite -eclogite from Donghai area, Jiangsu Province in ChinaInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 2, extended abstract p. 923-924ChinaEclogite, Coesite
DS2002-1681
2002
Ishiwatari, A.Walker, R.J., Prichard. H.M., Ishiwatari, A., PimentelThe osmium isotopic composition of convecting upper mantle deduced from ophiolite chromites.Geochimica et Cosmochimica Acta, Vol. 66, No. 2, pp. 329-45.MantleGeochronology, Chromites
DS1982-0356
1982
Ishizaki, C.Labrecque, J.J., Nagata, K., Ishizaki, C., Ishizaki, K.Environmental Impact of Diamond Mining in the Guanamo Riverbasin.Agid Report No. 7, Hidden Wealth: Mineral Exploration Techni, PAPER F3, P. 185. (abstract.)GlobalChemistry, Waters
DS1982-0356
1982
Ishizaki, K.Labrecque, J.J., Nagata, K., Ishizaki, C., Ishizaki, K.Environmental Impact of Diamond Mining in the Guanamo Riverbasin.Agid Report No. 7, Hidden Wealth: Mineral Exploration Techni, PAPER F3, P. 185. (abstract.)GlobalChemistry, Waters
DS201710-2270
2017
Ishizuka, A.Umino, S., Knayama, K., Kitamura, K., Tamura, A., Ishizuka, A., Senda, R., Arai, S.Did boninite originate from the heterogeneous mantle with reycled ancient slab?Island Arc, Sept. 28, 3p.Mantlesubduction

Abstract: Boninites are widely distributed along the western margin of the Pacific Plate extruded during the incipient stage of the subduction zone development in the early Paleogene period. This paper discusses the genetic relationships of boninite and antecedent protoarc basalt magmas and demonstrates their recycled ancient slab origin based on the T-P conditions and Pb-Hf-Nd-Os isotopic modeling. Primitive melt inclusions in chrome spinel from Ogasawara and Guam islands show severely depleted high-SiO2, MgO (high-silica) and less depleted low-SiO2, MgO (low-silica and ultralow-silica) boninitic compositions. The genetic conditions of 1?346?°C at 0.58?GPa and 1?292?°C at 0.69?GPa for the low- and ultralow-silica boninite magmas lie on adiabatic melting paths of depleted mid-ocean ridge basalt mantle with a potential temperature of 1?430?°C in Ogasawara and of 1?370?°C in Guam, respectively. This is consistent with the model that the low- and ultralow-silica boninites were produced by remelting of the residue of the protoarc basalt during the forearc spreading immediately following the subduction initiation. In contrast, the genetic conditions of 1?428?°C and 0.96?GPa for the high-silica boninite magma is reconciled with the ascent of more depleted harzburgitic source which pre-existed below the Izu-Ogasawara-Mariana forearc region before the subduction started. Mixing calculations based on the Pb-Nd-Hf isotopic data for the Mariana protoarc basalt and boninites support the above remelting model for the (ultra)low-silica boninite and the discrete harzburgite source for the high-silica boninite. Yb-Os isotopic modeling of the high-Si boninite source indicates 18-30?wt% melting of the primitive upper mantle at 1.5-1.7?Ga, whereas the source mantle of the protoarc basalt, the residue of which became the source of the (ultra)low-Si boninite, experienced only 3.5-4.0?wt% melt depletion at 3.6-3.1?Ga, much earlier than the average depleted mid-ocean ridge basalt mantle with similar degrees of melt depletion at 2.6-2.2?Ga.
DS201412-0838
2013
Ishmurzin, F.I.Skublov, S.G., Melnik, A.E., Marin, Yu.B., Berezin, A.V., Bogomolov, E.S., Ishmurzin, F.I.New dat a on the age ( U-Pb, Sm-Nd) of metamorphism and a protolith of eclogite like rocks from the Krasnaya Guba area, Belomorian belt.Doklady Earth Sciences, Vol. 451, 1, pp. 1156-1164.RussiaEclogite
DS201509-0423
2014
Ishwar-Kumar, C.Ratheesh-Kumar, R.T., Ishwar-Kumar, C., Windley, B., Razakamanana, T., Nair, R.R., Sajeev, K.India-Madagascar paleo-fit based on flexural isostasy of their rifted margins.Gondwana Research, Vol. 28, 2, pp. 581-600.India, Africa, MadagascarTectonics

Abstract: The present study contributes new constraints on, and definitions of, the reconstructed plate margins of India and Madagascar based on flexural isostasy along the Western Continental Margin of India (WCMI) and the Eastern Continental Margin of Madagascar (ECMM). We have estimated the nature of isostasy and crustal geometry along the two margins, and have examined their possible conjugate structure. Here we utilize elastic thickness (Te) and Moho depth data as the primary basis for the correlation of these passive margins. We employ the flexure inversion technique that operates in spatial domain in order to estimate the spatial variation of effective elastic thickness. Gravity inversion and flexure inversion techniques are used to estimate the configuration of the Moho/Crust-Mantle Interface that reveals regional correlations with the elastic thickness variations. These results correlate well with the continental and oceanic segments of the Indian and African plates. The present study has found a linear zone of anomalously low-Te (1-5 km) along the WCMI (~1680 km), which correlates well with the low-Te patterns obtained all along the ECMM. We suggest that the low-Te zones along the WCMI and ECMM represent paleo-rift inception points of lithosphere thermally and mechanically weakened by the combined effects of the Marion hotspot and lithospheric extension due to rifting. We have produced an India-Madagascar paleo-fit representing the initial phase of separation based on the Te estimates of the rifted conjugate margins, which is confirmed by a close-fit correlation of Moho geometry and bathymetry of the shelf margins. The matching of tectonic lineaments, lithologies and geochronological belts between India and Madagascar provide an additional support for the present plate reconstruction.
DS201610-1873
2016
Ishwar-Kumar, C.Ishwar-Kumar, C., Santosh, M., Wilde, S.A., Tsunogae, T., Itaya, T., Windley, B., Sajeev, K.Mesoproterozoic suturing of Archean crustal blocks in western peninsula India: implications for India-Madagascar correlations.Lithos, Vol. 263, pp. 143-160.IndiaGeodynamics

Abstract: The Kumta and Mercara suture zones welding together Archean crustal blocks in western peninsular India offer critical insights into Precambrian continental juxtapositions and the crustal evolution of eastern Gondwana. Here we present the results from an integrated study of the structure, geology, petrology, mineral chemistry, metamorphic P-T conditions, zircon U-Pb ages and Lu-Hf isotopes of metasedimentary rocks from the two sutures. The dominant rocks in the Kumta suture are greenschist- to amphibolite-facies quartz-phengite schist, garnet-biotite schist, chlorite schist, fuchsite schist and marble. The textural relations, mineral chemistry and thermodynamic modelling of garnet-biotite schist from the Kumta suture indicate peak metamorphic P-T conditions of ca. 11 kbar at 790 °C, with detrital SHRIMP U-Pb zircon ages ranging from 3420 to 2547 Ma, eHf (t) values from - 9.2 to 5.6, and TDMc model ages from 3747 to 2792 Ma. The K-Ar age of phengite from quartz-phengite schist is ca. 1326 Ma and that of biotite from garnet-biotite schist is ca. 1385 Ma, which are interpreted to broadly constrain the timing of metamorphism related to the suturing event. The Mercara suture contains amphibolite- to granulite-facies mylonitic quartzo-feldspathic gneiss, garnet-kyanite-sillimanite gneiss, garnet-biotite-kyanite-gedrite-cordierite gneiss, garnet-biotite-hornblende gneiss, calc-silicate granulite and metagabbro. The textural relations, mineral chemistry and thermodynamic modelling of garnet-biotite-kyanite-gedrite-cordierite gneiss from the Mercara suture indicate peak metamorphic P-T conditions of ca. 13 kbar at 825 °C, followed by isothermal decompression and cooling. For pelitic gneisses from the Mercara suture, LA-ICP-MS U-Pb zircon ages vary from 3249 to 3045 Ma, eHf (t) values range from - 18.9 to 4.2, and TDMc model ages vary from 4094 to 3314 Ma. The lower intercept age of detrital zircons in the pelitic gneisses from the Mercara suture ranges from 1464 to 1106 Ma, indicating the approximate timing of a major lead-loss event, possibly corresponding to metamorphism, and is broadly coeval with events in the Kumta suture. Synthesis of the above results indicates that the Kumta and Mercara suture zones incorporated sediments from Palaeoarchean to Mesoproterozoic sources and underwent high-pressure metamorphism in the late Mesoproterozoic. The protolith sediments were derived from regions containing juvenile Palaeoarchean crust, together with detritus from the recycling of older continental crust. Integration of the above results with published data suggests that the Mesoproterozoic (1460-1100 Ma) Kumta and Mercara suture zones separate the Archean (3400-2500 Ma) Karwar-Coorg block and Dharwar Craton in western peninsular India. Based on regional structural and other geological data we interpret the Kumta and Mercara suture zones as extensions of the Betsimisaraka suture of eastern Madagascar into western India.
DS200912-0635
2009
Isidoro, l.Robles-Cruz, S.E., Watangua, M., Isidoro, l., Melgarejo, J.C., Gali, S., Olimpo, A.Contrasting compositions and textures of ilmenite in the Catoca kimberlite, Angola, and implications in exploration for diamond.Lithos, In press - available formatted 10p.Africa, AngolaDeposit - Catoca
DS200412-0878
2004
Isjikawa, A.Isjikawa, A., Maruyama, S., Komiya, T.Layered lithospheric mantle beneath the Ontong Java Plateau: implications from xenoliths in alnoite, Malaita, Solomon Islands.Journal of Petrology, Vol. 45, 10, pp. 2011-2044.Indonesia, Solomon IslandsPeridotite, pyroxenites, xenoliths, geothermometry
DS200412-1894
2004
Iskandarani, M.Srinivasan, A., Top,Z., Sclosser, P., Hohmann, R., Iskandarani, M., Olson, D.B., Lupton, J.E., Jenkins, W.J.Mantle 3 He distribution and deep circulation in the Indian Ocean.Journal of Geophysical Research, Vol. 109, 6, 10.1029/2003 JC002028Indian OceanMineralogy
DS1988-0699
1988
Iskandarkhodzhayev, T.A.Tkachev, V.N., Iskandarkhodzhayev, T.A., Savitskaya, L.I., ShainThe Almalyk Permian strat a of the Adrasman volcanogenic structure.(Russian)Uzbekiston Geologiya Zhurnal., (Russian), No. 3, pp. 29-34RussiaNative element-diamond, Biostratigraphy
DS1992-0856
1992
Iskandarov, E.Khamrabayev, I.Kh., Iskandarov, E., Khamrabeyeva, Z.I., NasyrivaGlimmerites and similar rocks from central AsiaInternational Geology Review, Vol. 34, No. 6, June pp. 629-638RussiaGlimmerites, Alkaline rocks
DS1987-0202
1987
Iskandarov, F. SH.Fayziyev, A.R., Iskandarov, F. SH.A new type of fluorspar deposit in the Pamirs.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), No. 6, pp. 375-378RussiaCarbonatite
DS202009-1632
2020
Iskrina, A.Iskrina, A., Spivak, A.V., Bobrov, A.V., Eremin, N.N., Marchenko, E.I., Dubrovinsky, L.S.Synthesis and crystal structures of new high-pressure phases CaAl2O4 and Ca2Al6O11.Lithos, Vol. 374-375, 6p. PdfMantlegarnet

Abstract: The phases of CaAl2O4 and Ca2Al6O11 were synthesized at 15 GPa and 1600 °C. Microprobe data gave formulae Ca1.003Al1.998O4 and Ca2.05Al5.97O11, on the basis of 4 and 11 oxygen atoms. The crystal structures have been refined by single-crystal X-ray diffraction. Orthorhombic unitcell parameters for CaAl2O4 are a = 8.8569(10) Å; b = 2.8561(4) Å; c = 10.2521(11) Å; V = 259.34(5) Å3; Z = 8 (space group Pnma). The Ca2Al6O11 phase was obtained for the first time. It crystallizes with a space group P42/mnm and has lattice parameters a = b = 11.1675(4) Å; c = 2.83180(10) Å; V = 353.16(2) Å3; Z = 2. A Raman spectrum was obtained for a new phase for the first time. Our results suggest that both studied phases are stable under the condition of the transition zone and can be considered as potential aluminum concentrators in the Earth's deep geospheres.
DS201809-2041
2018
Iskrina, A.V.Iskrina, A.V., Bobrov, A.V., Kriulina, G.Y., Zedgenizov, D.A., Garanin, V.K.Melt/fluid inclusions in diamonds from the Lomonosov deposit ( Arkangelsk kimberlite province).Goldschmidt Conference, 1p. AbstractRussia, Kola Peninsuladeposit - Lomonosov

Abstract: Melt/fluid inclusions in diamonds provide important evidence for mantle diamond-forming fluids or melts. By now, the major characteristics of the composition of microinclusions have been analyzed in diamonds from several kimberlite provinces and pipes worldwide [1-4]. Here we report the first data on the composition of parent diamondforming melts for diamonds from the Arkhangelsk kimberlite province. After the study of morphology, specialty of the internal structure, and distribution of microinclusions in diamonds, 10 single crystals were selected from the 31 diamonds of the representative collection. The studied crystals may be divided into two groups: cuboids and coated diamonds. The crystals have grayish yellow or dark gray colors and are almost nontransparent due to the high content of microinclusions. Polished slices of these diamonds were studied by IR-spectroscopy, which allowed us to calculate the content of nitrogen defects, as well as the content of water and carbonates in microinclusions. X-ray spectral analyses allowed to study the composition of fluid/melt microinclusions and showed that they were essentially carbonate-silicate with significant variations between these two end-members. All inclusions contain water, with the highest H2O/CO2 in highly siliceous inclusions. Unlike diamonds from Canada and South Africa [1, 2], the studied inclusions in diamionds from the Arkhangelsk province are almost free of chlorides. Comparison of the data obtained with the database on fliud/melt inclusions in diamonds worldwide shows similar of Arkhangelsk diamonds to some diamonds from Yakutia [3, 4], and the data obtained are the most similar to the composition of microinclusions in diamonds from the Internatsionalnaya pipe (Yakutia).
DS201910-2275
2019
Iskrina, A.V.Kriulina, G.Yu., Iskrina, A.V., Zedgenizov, D.A., Bobrov, A.V., Garanin, V.K.The compositional pecularities of microinclusions in diamonds from the Lomonosov deposit ( Arkangelsk Province).Geochemistry International, Vol. 57, 9, pp. 963-980.Russiadeposit - Lomonosov

Abstract: The data on the composition of microinclusions in diamonds from the Lomonosov deposits are reported for the first time. The studied diamonds include “coated” (n = 5) and cubic (n = 5) crystals. The estimated range of the degree of nitrogen aggregation in diamonds (4-39% B1) does not support their direct links with kimberlite magmatism; however, their short occurrence in the mantle at higher temperatures is probable as well. The composition of melt/fluid microinclusions in these samples varies from essentially carbonatitic to significantly silicate. It is shown that the contents of MgO, CaO, Na2O, Cl, and P2O5 decrease with increasing content of silicates and water. Different mechanisms of the generation and evolution of diamond-forming media are discussed to explain the observed variations.
DS1996-0670
1996
Islam, S.M.N.Islam, S.M.N., Jolley, A.Sustainable development in Asia: the current state and policy decisionsNatural Resources forum, Vol. 20, No. 4, pp. 263-279AsiaEconomics, Legal, environment
DS201312-0431
2013
Isles, D.Isles, D., Rankin, L.Geological interpretation of aeromagnetic data.Ebook, approx. $ 100.TechnologyGeophysics - aeromag not specific to diamonds but interest
DS200712-0098
2007
Isles, D.J.Boyd, D.M., Isles, D.J.Geological interpretation of airborne magnetic surveys - 40 years on.Proceedings of Exploration 07 edited by B. Milkereit, pp. 491-505.TechnologyGeophysics - magnetics - review
DS2002-0002
2002
Isley, A.E.Abbott, D.H., Isley, A.E.The intensity, occurrence and duration of superplume events and eras over geological time.Journal of Geodynamics, Vol.34, 2, Sept. pp. 265-307.GlobalTectonics, Geochronology
DS2002-0003
2002
Isley, A.E.Abbott, D.H., Isley, A.E.Extraterrestrial influence on mantle plume activityEarth and Planetary Science Letters, Vol. 205, 1-2, pp. 53-62.MantleHot spots, plumes
DS2002-0004
2002
Isley, A.E.Abbott, D.H., Isley, A.E.The intensity, occurrence and duration of superplume events and eras over geological timeJournal of Geodynamics, Vol. 34, 2, pp. 265-307.MantleTectonics
DS2002-0751
2002
Isley, A.E.Isley, A.E., Abbott, D.H.Implications of the temporal distribution of high Mg magmas for mantle plume volcanism through time.Journal of Geology, Vol.110, 2, pp. 141-58.MantleMagmatism, high magnesium magmas, Plume - hot spots
DS2002-0752
2002
Isley, A.E.Isley, A.E.,Abbott, D.H.Implications of the temporal distribution of high Mg magmas for mantle plume volcanism through time.Journal of Geology, Vol.110,No.2,pp.141-58.GlobalUltramafics, komatiites, meimcheites, picrites, Plume - time series, geochronology
DS201809-2021
2018
Ismail, A.Fletcher, A.W., Abdelsalam, M.G., Emishaw, L., Atekwana, E.A., Lao-Davila, D.A., Ismail, A.Lithospheric controls on the rifting of the Tanzanian Craton at the Eyasi Basin, eastern branch of the East African Rift system.Tectonics, Aug 14, doi: 10.1029/2018 TC005065Africa, Tanzaniacraton

Abstract: Continental rifts most often nucleate within orogenic belts. However, some studies in the East African Rift System (EARS) have shown that continental rifts can also develop withincratons. This work investigated the ~1.5 Ma Eyasibasin,which propagates in a WSW direction into the Tanzanian craton. The basin is located where the Eastern Branch of the EARS transitions from a narrow rift (~70 km wide) thewider(~300 km wide) North Tanzanian Divergence. Unlike the rest of the Eastern Branch segments, the Eyasibasindoes not follow the Mozambique orogenic belt located on the eastern margin of the Tanzanian craton. This work generatedlithospheric-scale sections across the basinusing: (1) Digital Elevation Model to map surface rift-related brittle structures; (2) Aeromagnetic data to determine the depth to the Precambrian basement;and (3) World Gravity Model 2012 to estimatecrustal and lithospheric thickness by applying the two-dimensional(2D) radially-averaged power spectral analysis and 2D forward gravity modeling. These cross-sectionsshow that the Eyasibasinnucleates within a previously unidentified suture zone within the Tanzanian cratonand that this suture zone is characterized by thinner lithospherethat can be as thin as ~95 km. This zone ofthinner lithosphere is offset southeastwardfrom the surface expression of the Eyasibasinand might have facilitated the formation of other basins further south. Furthermore, the lithospheric thickness map indicates that the Tanzanian craton is heterogeneous and possibly composed of multiplesmaller cratonic fragments.
DS1998-0662
1998
Ismail, W.B.Ismail, W.B., Mainprice, D.An olivine fabric database: an overview of upper mantle fabrics and seismicanisotropy.Tectonophysics, Vol. 296, No. 1-2, . Oct. 30, pp. 145-158.MantleXenoliths, Magmatism
DS1998-0921
1998
Ismail, W.B.Mainprice, D., Barruol, G., Ismail, W.B., Lloyd, G.Automatic crystal orientation mapping of kimberlite nodules using electron back scattererd diffraction..7th International Kimberlite Conference Abstract, pp. 535-6.GlobalKimberlite nodules, Spectroscopy - scanning electron microscope (SEM), EBSP
DS200412-0879
2004
Ismail Zadeh, A.Ismail Zadeh, A., Schubert, G., Tsepelev, I., Korotkii, A.Inverse problems of thermal convection: numerical approach and application to mantle plume restoration.Physics of the Earth and Planetary Interiors, Vol. 145, 1-4, pp. 99-114.MantleGeothermometry
DS200412-0880
2004
Ismail Zadeh, A.T.Ismail Zadeh, A.T.Dynamics of a descending lithospheric slab and tectonic stresses in continental collision zones.Doklady Earth Sciences, Vol. 394, 2, Feb-Mar. pp. 296-298.MantleTectonics, subduction
DS201710-2219
2017
Ismailova, L.Cerantola, V., Bykova, E., Kupenko, I., Merlini, M., Ismailova, L., McCammon, C., Bykov, M., Chumakov, A.I., Petitgirard, S., Kantor, I., Svityk, V., Jacobs, J., Hanfland, M., Mezouar, M., Prescher, C., Ruffer, R., Prakapenka, V.B., Duvbovinsky, L.How iron carbonates help form diamonds.Nature Communications, July 18 #15960Mantlecarbonate inclusions
DS200712-0469
2006
Ismail-Zadeh, A.T.Ismail-Zadeh, A.T., Korotkii, A.I., Krupsky, D.P., Tsepelev, I.A., Schubert, G.Evolution of thermal plumes in the Earth's mantle.Doklady Earth Sciences, Vol. 411, 9, Nov-Dec. pp. 1442-1443.MantleGeothermometry
DS201212-0076
2012
Ismalilova, L.S.Bobrov, A.V., Llitvin, Y.A., Ismalilova, L.S.Diamond forming efficiency of chloride-silicate carbonate melts: the role of chlorides,10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractTechnologyDiamond genesis
DS1996-1514
1996
Isnor, R.Warhurst, A., Isnor, R.Environmental issues for developing countries arising from liberalized trade in the mining industryNatural Resources forum, Vol. 20, No. 1, Feb. 1, pp. 27-36GlobalLegal -environment, Economics
DS2000-0435
2000
Isnor, R.Isnor, R.Explicit and implicit technology policies affecting closure: examples fromAustralia, Canada and USAMinerals and Energy, Vol. 15, No. 1, pp. 2-15.Northwest TerritoriesEnvironmental - legal, Mine closure
DS201012-0311
2010
Isobe, F.Irifune, T., Isobe, F., Shinmei, T., Sanchira, T., Ohfuji, H., Kurio, A., Sumiya, H.Synthesis of ultrahard nano-polycrystalline diamond at high pressure and temperature using a large volume multianvil apparatus.International Mineralogical Association meeting August Budapest, abstract p. 182.TechnologyDiamond synthesis
DS201412-0410
2014
Isola, I.Isola, I., Mazzarini, F., Bonini, M., Corti, G.Spatial variability of volcanic features in early stage rift settings: the case of the Tanzania divergence, East African rift system.Terra Nova, in press availableAfrica, TanzaniaTectonics
DS201502-0065
2014
Isola, I.Isola, I., Mazzarini, F., Bonini, M., Cortiz, G.Spatial variability of volcanic features in early-stage rift settings: the case of the Tanzanian divergence, East African Rift.Terra Nova, Vol. 26, pp. 461-468.Africa, TanzaniaRifting, magmatism
DS201502-0069
2014
Israde-Alantara, I.Kinzie, C.R., Que Hee, S.S., Stich, A., Tague, K.A., Mercer, C., Razink, J.J., Kennett, D.J.,