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SDLRC - Scientific Articles all years by Author - Mi-Mn


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 - Md-Mn
Posted/
Published
AuthorTitleSourceRegionKeywords
DS1989-0994
1989
Mdahavan, V.Mdahavan, V., Kurram, M.Z.A.K.The alkaline gneisses of Khariar, Kalahandi District, OrissaGeological Society of India, Memoir, Editor C. LeelanandaM., No. 15, pp. 265-290IndiaAlkaline rocks, Malignite, shonkinite
DS201312-0293
2013
MdalaGao, 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
DS1995-1216
1995
MDD/SEG Field Excursion GuidebookMDD/SEG Field Excursion GuidebookDistribution and tectonic significance of alkaline igneous rocks in southern Africa.Mdd/seg Guidebook Nov., pp. 193-202. extractSouth AfricaAlkaline rocks, Tectonics
DS1995-1217
1995
MDD/SEG Field Excursion GuidebookMDD/SEG Field Excursion GuidebookKimberlites and diamondsMdd/seg Guidebook Nov., 12p.South AfricaBrief overview
DS1995-1218
1995
MDD/SEG Field Excursion GuidebookMDD/SEG Field Excursion GuidebookPort Nolloth to Alexander BayMdd/seg Guidebook Nov., 10p.South AfricaMarine, coast diamonds, Deposit -Auchas
DS2003-0924
2003
Mdludlu, S.Mdludlu, S., Mabuza, M.B., Tainton, K.M., Sweeney, R.J.A clinopyroxene thermobarometry traverse across Coromandel area, Brazil8 Ikc Www.venuewest.com/8ikc/program.htm, Session 9, POSTER abstractBrazilGeothermometry
DS200412-1285
2003
Mdludlu, S.Mdludlu, S., Mabuza, M.B., Tainton, K.M., Sweeney, R.J.A clinopyroxene thermobarometry traverse across Coromandel area, Brazil.8 IKC Program, Session 9, POSTER abstractSouth America, BrazilCraton studies Geothermometry
DS2001-0765
2001
Mdumba, J.A.Mdumba, J.A.Diamonds, ethnicity, and power: the case of Sierra LeoneMediterranean Quarterly, Vol. 12, No. 4, pp. 90-104.Sierra LeoneHistory
DS200412-0861
2004
MEAHussein, M.F., Mondal, MEA, Ahmad, T.Petrological and geochemical characteristics of Archean gneisses and granitoids from Bastar Craton, central India - implicationGondwana Research, Vol. 7, 2, pp. 531-538.IndiaSubduction
DS200812-0735
2008
Meade, B.J.Meade, B.J., Conrad, C.P.Andean growth and the deceleration of South American subduction: time evolution of a coupled orogen subduction system.Earth and Planetary Science Letters, Vol. 275, 1-2, pp. 93-101.South AmericaSubduction
DS1990-1024
1990
Meade, C.Meade, C., Jeanloz, R.The strength of mantle silicates at high pressures and room temperature:implications for the viscosity of the mantleNature, Vol. 348, No. 6301, December 6, pp. 533-535GlobalMantle, Silicates
DS1993-1014
1993
Meade, C.Meade, C.Texture measurements on highly strained aggregates of olivine and silicate perovskite and the application for the study of seismic anisotropy in themantle.American Geophysical Union, EOS, supplement Abstract Volume, October, Vol. 74, No. 43, October 26, abstract p. 551.MantlePerovskite, Mineralogy
DS1986-0174
1986
Meakins, A.E.Deakin, A.S., Boxer, G.L., Meakins, A.E., Haebig, E., Lew, J.H.Geology of the Argyle alluvial diamond deposits #1Proceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 451-453AustraliaDiamond exploration
DS1989-0345
1989
Meakins, A.E.Deakin, A.S., Boxer, G.L., Meakins, A.E., Haebig, A.E., Lew, J.H.Geology of the Argyle alluvial diamond deposits #2Geological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 2, pp. 1108-1116AustraliaAlluvial-placers, Deposit -Argyle
DS1989-0995
1989
Means, W.D.Means, W.D.A construction for shear stress on a generally oriented planeJournal of Structural Geology, Vol. 11, No. 5, pp. 625-628GlobalStructure, Shear zone
DS1989-0996
1989
Means, W.D.Means, W.D.Stretching faultsGeology, Vol. 17, October pp. 893-896GlobalStructure, Stretching faults
DS1990-1025
1990
Means, W.D.Means, W.D.One -dimensional kinematics of stretching faultsJournal of Structural Geology, Vol. 12, No. 2, pp. 267-272GlobalStructure, Fault kinematics
DS1992-1040
1992
Means, W.D.Means, W.D.How to do anything with MOHR CIRCLESGsa Short Course About Tensors For Structural Geologists, Two seperate volumes, workbook and completed oneGlobalShort course notes, Structural geology -MOHR CIRCLES
DS1993-1015
1993
Means, W.D.Means, W.D.Elementary geometry of deformation processesJournal of Structural Geology, Vol. 15, No. 3-4, pp. 343-350GlobalStructure, Deformation
DS1994-1162
1994
Means, W.D.Means, W.D., Park, Y.New experimental approach to understanding igneous textureGeology, Vol. 22, No. 4, April pp. 323-326GlobalTexture, Igneous
DS1995-1219
1995
Means, W.D.Means, W.D.Shear zones and rock historyTectonophysics, Vol. 247, No. 1-4, July 30, pp. 157-160GlobalShear zones
DS1984-0509
1984
Meares And PhilipsMeares And PhilipsBridge Oil: Aredor Diamond ProjectInvestment Review., MARCH 3RD. 2P.West Africa, GuineaMarketing, Politics, Mining Recovery, Diamonds
DS1950-0147
1953
Mears, B.Mears, B.Quaternary Features of the Medicine Bow Mountains, WyomingWyoming Geol. Association Guidebook, 8th. Annual Field Conference, PP. 81-84.GlobalKimberlite, Medicine Bow Mountains, Rocky Mountains
DS1960-0711
1966
Meaton, E.ST.P.Meaton, E.ST.P.Basutoland Diamonds: Evaluation of Selected Kimberlites Andalluvials.Overseas Geol. Institute Report, LesothoDiamond Mining Recovery, Kimberlite Pipes, Alluvial Diamond Placers
DS201709-1965
2017
Mechanti, M.Bruguier, O., Bosch, D., Caby, R., Vitale-Brovarone, A., Fernadez, L., Hammor, D., Laouar, R., Ouabadi, A., Abdallah, N., Mechanti, M.Age of UHP metamorphism in the Western Mediterranean: insight from rutile and minute zircon inclusions in a diamond bearing garnet megacryst ( Edough Massif, NE Algeria).Earth and Planetary Science Letters, Vol. 474, pp. 215-225.Africa, Algeriadiamond inclusions

Abstract: Diamond-bearing UHP metamorphic rocks witness for subduction of lithospheric slabs into the mantle and their return to shallow levels. In this study we present U-Pb and trace elements analyses of zircon and rutile inclusions from a diamond-bearing garnet megacryst collected in a mélange unit exposed on the northern margin of Africa (Edough Massif, NE Algeria). Large rutile crystals (up to 300 µm in size) analyzed in situ provide a U-Pb age of 32.4 ± 3.3 Ma interpreted as dating the prograde to peak subduction stage of the mafic protolith. Trace element analyses of minute zircons (=30 µm) indicate that they formed in equilibrium with the garnet megacryst at a temperature of 740-810 °C, most likely during HP retrograde metamorphism. U-Pb analyses provide a significantly younger age of 20.7 ± 2.3 Ma attributed to exhumation of the UHP units. This study allows bracketing the age of UHP metamorphism in the Western Mediterranean Orogen to the Oligocene/early Miocene, thus unambiguously relating UHP metamorphism to the Alpine history. Exhumation of these UHP units is coeval with the counterclockwise rotation of the Corsica-Sardinia block and most likely resulted from subduction rollback that was driven by slab pull.
DS201412-0088
2014
Mechati, M.Caby, R., Bruguier, O., Fernandez, L., Hammor, D., Bosch, D., Mechati, M., Laouar, R., Ouabadi, A., Abdallah, N., Douchet, C.Metamorphic diamonds in a garnet megacryst from the Edough Massif (northeastern Algeria)… Recognition and geodynamic consequences.Tectonophysics, Vol. 637, pp. 341-353.Africa, AlgeriaEdough Massif
DS1995-1220
1995
Mechie, J.Mechie, J.The structure of the Kenya Rift from wide angle seismic measurementsGeological Society Africa 10th. Conference Oct. Nairobi, pp. 139-40. Abstract.KenyaTectonics, Geophysics -seismics
DS1997-0928
1997
Mechie, J.Prodehl, C., Fuchs, K., Mechie, J.Seismic-refraction studies of the Afri-Arabian rift system - a briefreview.Tectonophysics, Vol. 278, No. 1-4, Sept. 15, pp. 1-14.AfricaTectonics, Rifting
DS2002-0850
2002
Mechie, J.Kind, R., Yuan, X., Saul, J., Nelson, D., Sobolev, S.V., Mechie, J., Zhao, W.Seismic images of crust and upper mantle beneath Tibet: evidence for Eurasian plateScience, No. 5596, pp. 1219-1221.Mantle, ChinaGeophysics - seismics
DS200512-0712
2005
Mechita, C.Mechita, C., Schmidt-Aursch, C., Jokat, W.The crustal structure of central East Greenland- I. From the Caledonian orogen to the Tertiary igneous province.Geophysical Journal International, Vol. 160, 2, pp. 736-752.Europe, GreenlandTectonics - not specific to diamonds
DS200512-0713
2005
Mechita, C.Mechita, C., Schmidt-Aursch, C., Jokat, W.The crustal structure of central East Greenland- II. From the Precambrian Shield to the recent mid-oceanic ridges.Geophysical Journal International, Vol. 160, 2, pp. 753-760.Europe, GreenlandTectonics - not specific to diamonds
DS200612-1189
2006
Mecklenburgh, J.Rutter, E.H., Mecklenburgh, J.The extraction of melt from crustal protoliths and the flow behaviour of partially molten crustal rocks: an experimental perspective.Evolution and differentiation of Continental Crust, ed. Brown, M., Rushmer, T., Cambridge Univ. Press, Chapter 2, pp. 384-429.MantleMelting
DS1991-1114
1991
Medak, F.Medak, F., Cressie, N.Confidence regions in Ternary diagrams based on the power divergencestatisticsMathematical Geology, Vol. 23, No. 8, November pp. 1045-1058GlobalGeostatistics, Ternary diagrams
DS200612-0504
2006
Medard, E.Grove, T.L., Chatterjee, N., Parman, S.W., Medard, E.The influence of H2O on mantle wedge melting.Earth and Planetary Science Letters, Vol. 249, 1-2, Sept. 15, pp. 74-89.MantleWater, melting
DS200612-0505
2006
Medard, E.Grove, T.L., Chatterjee, N., Parman, S.W., Medard, E.The influence of H2O on mantle wedge melting.Earth and Planetary Science Letters, Vol. 249, 1-2, pp. 74-89.MantleWater, melting
DS200612-0900
2006
Medard, E.Medard, E., Schmidt, M.W., Schiano, P., Ottolini, L.Melting of amphibole bearing wehrlites: an experimental study on the origin of ultra calcic nepheline normative melts.Journal of Petrology, Vol. 47, 3, pp. 481-504.TechnologyWehrlite
DS200612-0901
2006
Medard, E.Medard, E., Schmidt, M.W., Schiano, P., Ottolini, L.Melting of amphibole bearing wehrlites: an experimental study on the origin of ultra-calcic nepheline normative melts.Journal of Petrology, Vol. 47, 3, pp. 481-504.TechnologyWehrlite
DS200812-0736
2008
Medard, E.Medard, E., Schmidt, M.Composition of low degree hydrous melts of fertile spinel or garnet bearing lherzolite.Goldschmidt Conference 2008, Abstract p.A617.TechnologyMelting
DS201312-0169
2013
Medard, E.Condamine, P., Medard, E., Laporte, D., Nauret, F.Experimental melting of phlogopite peridotite at 1 Gpa - implications for potassic magmatism.Goldschmidt 2013, AbstractMantleSubduction
DS201412-0136
2014
Medard, E.Condamine, P., Medard, E.Experimental melting of phlogopite bearing mantle at 1 Gpa: implications for potassic magmatism.Earth and Planetary Science Letters, Vol. 397, pp. 80-92.MantleMagmatism
DS201412-0166
2014
Medard, E.Dauphas, N., Roskosz, M., Alp, E.E., Neuville, D.R., Hu, M.Y., Sio, C.K., Tissot, F.L.H., Zhao, J., Tissandier, L., Medard, E., Cordier, C.Magma redox and structural controls on iron isotope variations in Earth's mantle and crust.Earth and Planetary Science Letters, Vol. 398, pp. 127-140.MantleRedox
DS201606-1077
2016
Medard, E.Baasner, A., Medard, E., Laporte, D., Hoffer, G.Partial melting of garnet lherzolite with water and carbon dioxide at 3 Gpa using a new melt extraction technique: implications for intraplate magmatism.Contributions to Mineralogy and Petrology, Vol. 171, 45p.MantleMagmatism

Abstract: The origin and source rocks of alkali-rich and SiO2-undersatured magmas in the Earth’s upper mantle are still under debate. The garnet signature in rare earth element patterns of such magmas suggests a garnet-bearing source rock, which could be garnet lherzolite or garnet pyroxenite. Partial melting experiments were performed at 2.8 GPa and 1345-1445 °C in a piston-cylinder using mixtures of natural lherzolite with either 0.4 wt% H2O and 0.4 wt% CO2 or 0.7 wt% H2O and 0.7 wt% CO2. Different designs of AuPd capsules were used for melt extraction. The most successful design included a pentagonally shaped disc placed in the top part of the capsule for sufficient melt extraction. The degrees of partial melting range from 0.2 to 0.04 and decrease with decreasing temperature and volatile content. All samples contain olivine and orthopyroxene. The amounts of garnet and clinopyroxene decrease with increasing degree of partial melting until both minerals disappear from the residue. Depending on the capsule design, the melts quenched to a mixture of quench crystals and residual glass or to glass, allowing measurement of the volatile concentrations by Raman spectroscopy. The compositions of the partial melts range from basalts through picrobasalts to foidites. Compared to literature data for melting of dry lherzolites, the presence of H2O and CO2 reduces the SiO2 concentration and increases the MgO concentration of partial melts, but it has no observable effect on the enrichment of Na2O in the partial melts. The partial melts have compositions similar to natural melilitites from intraplate settings, which shows that SiO2-undersaturated intraplate magmas can be generated by melting of garnet lherzolite in the Earth’s upper mantle in the presence of H2O and CO2.
DS201612-2289
2016
Medard, E.Condamine, P., Medard, E., Devidal, J-L.Experimental melting of phlogopite-peridotite in the garnet stability field.Contributions to Mineralogy and Petrology, Vol. 171, pp. 95-121.TechnologyMelting - peridotite

Abstract: Melting experiments have been performed at 3 GPa, between 1150 and 1450 °C, on a phlogopite-peridotite source in the garnet stability field. We succeeded to extract and determine the melt compositions of both phlogopite-bearing lherzolite and harzburgite from low to high degrees of melting (? = 0.008-0.256). Accounting for the presence of small amounts of F in the mantle, we determined that phlogopite coexists with melt >150 °C above the solidus position (1150-1200 °C). Fluorine content of phlogopite continuously increases during partial melting from 0.2 to 0.9 wt% between 1000 and 1150 °C and 0.5 to 0.6 wt% between 1150 and 1300 °C at 1 and 3 GPa, respectively. The phlogopite continuous breakdown in the lherzolite follows the reaction: 0.59 phlogopite + 0.52 clinopyroxene + 0.18 garnet = 0.06 olivine + 0.23 orthopyroxene + 1.00 melt. In the phlogopite-harzburgite, the reaction is: 0.93 phlogopite + 0.46 garnet = 0.25 olivine + 0.14 orthopyroxene + 1.00 melt. Melts from phlogopite-peridotite sources at 3 GPa are silica-undersaturated and are foiditic to trachybasaltic in composition from very low (0.8 wt%) to high (25.6 wt%) degrees of melting. As observed at 1 GPa, the potassium content of primary mantle melts is buffered by the presence of phlogopite, but the buffering values are higher, from 6.0 to 8.0 wt% depending on the source fertility. We finally show that phlogopite garnet-peridotite melts are very close to the composition of the most primitive post-collisional lavas described worldwide.
DS201701-0006
2016
Medard, E.Condamine, P., Medard, E., Devidal, J-L.Experimental melting of phlogopite peridotite in the garnet stability field.Contributions to Mineralogy and Petrology, Vol. 171, pp. 95-106.MantleMelting

Abstract: Melting experiments have been performed at 3 GPa, between 1150 and 1450 °C, on a phlogopite-peridotite source in the garnet stability field. We succeeded to extract and determine the melt compositions of both phlogopite-bearing lherzolite and harzburgite from low to high degrees of melting (? = 0.008-0.256). Accounting for the presence of small amounts of F in the mantle, we determined that phlogopite coexists with melt >150 °C above the solidus position (1150-1200 °C). Fluorine content of phlogopite continuously increases during partial melting from 0.2 to 0.9 wt% between 1000 and 1150 °C and 0.5 to 0.6 wt% between 1150 and 1300 °C at 1 and 3 GPa, respectively. The phlogopite continuous breakdown in the lherzolite follows the reaction: 0.59 phlogopite + 0.52 clinopyroxene + 0.18 garnet = 0.06 olivine + 0.23 orthopyroxene + 1.00 melt. In the phlogopite-harzburgite, the reaction is: 0.93 phlogopite + 0.46 garnet = 0.25 olivine + 0.14 orthopyroxene + 1.00 melt. Melts from phlogopite-peridotite sources at 3 GPa are silica-undersaturated and are foiditic to trachybasaltic in composition from very low (0.8 wt%) to high (25.6 wt%) degrees of melting. As observed at 1 GPa, the potassium content of primary mantle melts is buffered by the presence of phlogopite, but the buffering values are higher, from 6.0 to 8.0 wt% depending on the source fertility. We finally show that phlogopite garnet-peridotite melts are very close to the composition of the most primitive post-collisional lavas described worldwide.
DS1995-1221
1995
Medaris, G.Medaris, G., Jelenik, E., Misar, Z.Czech eclogites -terrane settings and implications for variscan tectonic evolution of the Bohemian Massif.European Journal of Mineralogy, Vol. 7, No. 1, Jan-Feb. pp. 7-28.GlobalEclogites, Terrane, tectonics
DS1995-1222
1995
Medaris, G.Medaris, G., Jelinek, E., Misar, Z.Czech eclogites: terrane settings and implications for Variscan tectonic evolution of the Bohemmian Massif.Eur. Journal of Mineralogy, No. 1, pp. 7-28.GlobalEclogites, Tectonics
DS1975-0486
1977
Medaris, L.G.Cullers, R.L., Medaris, L.G.Rare Earth Elements in Carbonatites and Cogenetic Alkaline Rocks: Examples from Seabrook Lake and Callander Bay, Ontario.Contributions to Mineralogy and Petrology, Vol. 65, PP. 143-153.Canada, OntarioRelated Rocks
DS1975-0869
1978
Medaris, L.G.Sinclair, P.D., Tempelman-Kluit, D.J., Medaris, L.G.Lherzolite Nodules from a Pleistocene Cinder Cone in Central Yukon.Canadian Journal of Earth Sciences, Vol. 15, No. 2, PP. 220-226.Canada, YukonBlank
DS1980-0230
1980
Medaris, L.G.Medaris, L.G.Petrogenesis of the Lien Peridotite and Associated Eclogites,almklovdalen Western Norway.Lithos, Vol. 13, No. 4, PP. 339-354.Norway, ScandinaviaPetrogenesis
DS1980-0231
1980
Medaris, L.G.Medaris, L.G.Convergent Metamorphism of Eclogite and Garnet Bearing Ultramafic Rocks at Lien, West Norway.Nature., Vol. 283, Jan. 31ST., PP. 470-472.Norway, ScandinaviaPetrogenesis
DS1995-1223
1995
Medaris, L.G.Medaris, L.G., Beard, B.L., Johnson, O.H., Valley, J.M.Garnet pyroxenite and eclogite in the Bohemian Massif -geochemical evidence for Variscan recycling.Geologische Rundschau, Vol. 84, No. 3, Sept. pp. 489-505.GermanyEclogites, Subduction
DS1999-0466
1999
Medaris, L.G.Medaris, L.G.Garnet peridotites in Eurasian high pressure and ultrahigh pressureterranes: diversity of origins....International Geology Review, Vol. 41, No. 9, Sept. pp. 799-815.Europe, Asia, Scandinavia, China, MongoliaPeridotites, Ronda, Beni Bousera, Kokchetav, Sulu, Metamorphism - ultra high pressure (UHP)
DS2003-0925
2003
Medaris, L.G.Medaris, L.G., Singer, B.S., Dott, R.H., Naymark, A., Johnson, C.M., SchottLate Paleoproterozoic climate, tectonics and metamorphism in the southern LakeJournal of Geology, Vol. 111, 3, pp. 243-258.MichiganTectonics
DS200412-1286
2003
Medaris, L.G.Medaris, L.G., Singer, B.S., Dott, R.H., Naymark, A., Johnson, C.M., Schott, R.C.Late Paleoproterozoic climate, tectonics and metamorphism in the southern Lake Superior region and proto North America: evidenceJournal of Geology, Vol. 111, 3, pp. 243-258.United States, MichiganTectonics
DS200612-0763
2005
Medaris, L.G.Lapen, T.J., Medaris, L.G., Johnson, C.M., Beard, B.L.Archean to middle Proterozoic evolution of Baltica subcontinental lithosphere:Contributions to Mineralogy and Petrology, Vol. 150, 2, pp. 131-145.Europe, Baltic ShieldTectonics
DS200612-0902
2006
Medaris, L.G.Medaris, L.G., Beard, B.L.Mantle derived UHP garnet pyroxenite and eclogite in the Moldanubian Gfohl Nappe, Bohemian Massif: a geochemical review, New PT and tectonic interpretationsInternational Geology Review, Vol. 48, 9, pp. 765-777.EuropeUHP
DS1960-1170
1969
Medaris, L.G. .Medaris, L.G. .Partioning of Iron 24 and Magnesium 24 between Coexisting Synthetic Olivine and Orthopyroxene.American Journal of Science, Vol. 267, PP. 945-968.Norway, ScandinaviaExperimental Petrology
DS1991-1115
1991
Medaris, L.G. Jr.Medaris, L.G. Jr., Beard, B.L.Czech eclogites in the Moldanubian zone of the Bohemmian Massif:petrological characteristics and tectonic significanceGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 444GlobalEclogites, Petrology
DS1998-0987
1998
Medaris, L.G. Jr.Medaris, L.G. Jr., Syada, G.Spinel peridotite xenoliths from the Al Ashaer volcano, Syria: acontribution to elemental composition ....International Geology Review, Vol. 40, No. 4, Apr. pp. 305-324.SyriaXenoliths - thermal state, Arabian lithosphere - subcontinental
DS1991-0087
1991
Medaris, L.G.Jr.Beard, B.L., Medaris, L.G.Jr., Johnson, C.M.Diverse origins and ages of eclogite and garnet peridotite from the Bohemian Massif, CzechoslovakiaGeological Society of America Annual Meeting Abstract Volume, Vol. 23, No. 5, San Diego, p. A 46GlobalEclogite, Peridotite
DS1992-1041
1992
Medaris, L.G.Jr.Medaris, L.G.Jr., Wang, H.F.Tectonic implications of garnet peridotite cooling rates: potential andproblemsGeological Society of America (GSA) Abstracts with programs, 1992 Annual, Vol. 24, No. 7, abstract p. A218Norway, Czechoslovakia, Switzerland, SpainPetrology, Garnet peridotite
DS1995-1224
1995
Medaris, L.G.Jr.Medaris, L.G.Jr., Fournelle, J.H., Jelinek, E.Thermobarometry and reconstructed chemical composition pyroxene spinelsymplectites: Czech Neogene lavas.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 371-373.GlobalGeobarometry, Symplectites
DS2001-0188
2001
Medaris, L.G.Jr.Christensen, N.I., Medaris, L.G.Jr., Jelenek, E.Depth variation of seismic anisotropy and petrology in central European lithosphere: tectonothermal synthesisJournal of Geophysical Research, Vol. 106, No. 1, Jan. 10, pp.645-64.EuropeLherzolites, Geothermometry
DS201212-0609
2012
Medaris, L.G.Jr.Russell, A.K., Kitajima, K., Strickland, A., Medaris, L.G.Jr., Schulze, D.J., Valley, J.W.Eclogite facies fluid infiltration: constraints from delta 10 O zoning in garnet.Contributions to Mineralogy and Petrology, in press available, 14p.Europe, NorwayEclogite
DS201804-0671
2018
Medeghini, L.Aurisicchio, C., Conte, A.M., Medeghini, L., Ottolini, L., De Vito, C.Major and trace element geochemistry of emerald from several deposits: implications for genetic models and classification schemes.Ore Geology Reviews, Vol. 94, pp. 351-366.Globalemerald classification

Abstract: In the present work, we report the chemical composition of representative emerald crystals from some of the most important worldwide deposits. Major and trace elements were investigated using Electron Microprobe Analysis (EMPA) and Secondary Ion Mass Spectrometry (SIMS) techniques. Binary, ternary and spider diagrams along with statistical analysis, i.e., Principal Component Analysis (PCA), were used to discriminate each deposit with high reliability. PCA of SiO2, Al2O3, V, Sc, B, Li content identified distinct groups. The use of binary and ternary diagrams contributed to discriminate among emerald crystals from various deposits, which are included in the same clusters of the PCA analysis. In addition, the geochemical features of each group were linked to the geological environment and genetic processes which leaded to emerald formation. In particular, the emeralds related to granitic-pegmatitic intrusions (Type-1) or those occurring in environments controlled by tectonic events (Type-2) were distinguished using the concentrations of major and trace elements. The results of this study can contribute to improve the existing genetic models and classification schemes as well as to identify useful geochemical fingerprints for provenance purposes.-
DS201601-0036
2015
Medeiros, E.B.Neumann, R., Medeiros, E.B.Comprehensive mineralogical and technological characterisation of the Araxa ( SE Brazil) complex REE ( Nb-P) ore, and the fate of its processing.International Journal of Mineral Processing, Vol. 144, pp. 1-10.South America, BrazilCarbonatite

Abstract: The rare earth elements (REE) are essential for a wide range of applications, from strategic assets (e.g. petroleum cracking, magnets for wind turbines) to popular merchandise, as smartphones. Since 2010, when China, the worlds close to exclusive REE supplier, imposed export quotas, several old and new deposits have been evaluated to compensate market shortage, taking advantage of significant price rises. The Araxá rare earth elements prospect boast a large reserve (6.34Mt @ 5.01% REO), as well as phosphate and niobium, in a deeply weathered ore of carbonatitic origin. The mineralogy and the ore properties are unconventional for rare earth elements, and require a detailed mineralogical and technological characterisation as starting point to develop a feasible processing route. Rare earths are predominantly carried by monazite (over 70%), and by a solid solution of the plumbogummite group minerals where the barium-rich term gorceixite predominates, while cerianite and bastnaesite account for less than 1% each. Minerals of the pyrochlore supergroup are the main Nb carriers, but phosphate is also due to monazite and the plumbogummite group minerals, as apatite has barely been detected. Goethite, high-Al hematite and quartz are the main gangue minerals, and goethite is thoroughly intergrown with the other phases. Fine particle size (P50 close to 45µm) and 47.4% of the REE in the -20µm size fraction is another feature typical of this kind of ore. The mineralogical and textural complexity of the ore required a comprehensive technological characterisation in order to evaluate processing options. Based on textural measurements, the concentration of monazite, the concentration of the REE carrying minerals and the reverse removal of quartz, as processing option for this ore, have been simulated. Incomplete liberation of monazite does limit its grade in an ideal concentrate to 80%, and its recovery to 70%. The low monazite recovery must be added to the loss of REE carried by other phases, reducing the overall REE recovery to below 45%. Monazite has also a very limited exposition of the mineral on the particle's surfaces, supposed to impair process efficiency enough to keep experimental results significantly far from the simulated ones. The concentration of the REE-bearing minerals might be efficient from the liberation point of view, and over 90% of the REE carriers can be recovered to a 97% grade concentrate. Due to the low REE grade of predominant gorceixite (3.3%), however, the concentrate's grade of 14% REE is just slightly above the double of the ore's grade. For the REE-bearing minerals taken together, the process efficiency might be hampered by selectivity due to the complex mineralogy. The major gangue minerals, goethite and hematite, are strongly intergrown with the other minerals of the assemblage, to an extent that evaluating reverse processing considering these phases was not feasible. The removal of quartz by reverse processing is quite straightforward, and 95% of the mineral might be removed to a high-grade quartz concentrate of 93%, with loss of REE of only 0.14%. The mass discharge of 8.7%, however, rises the grade of the concentrate only to 7.3% REE. Complex mineralogy and the fine crystals and particles with strong intergrowth that characterise the ore hamper efficient concentration for the Araxá REE ore, and direct hydrometallurgical processing of the whole was adopted. The results are in agreement with the few other published attempts to concentrate the rare earth minerals from residual lateritic ores related to carbonatites
DS1981-0086
1981
Medenbach, O.Bluechel, K., Medenbach, O.The Wonder of Minerals; Crystals, Gold and Precious StonesDokumente., 287P.GlobalDiamonds, Kimberlite, Kimberley
DS1986-0556
1986
Medenbach, O.Medenbach, O., Wilk, H.The magic of mineralsSpringer Verlag, 204pGlobalMineralogy, Diamond
DS1989-1548
1989
Medenbach, O.Velde, D., Medenbach, O., Wagner, C., Schreyer, W.Chayesite, K(Mg,Fe2+)4 Fe3+[Si12)30American Mineralogist, Vol. 74, No. 11, 12 November-December, pp. 1368-1373UtahLamproite, chaysite, osumilite group, Chayesite -Moon Canyon, magnesium silicate
DS200612-1234
2005
Medenbach, O.Schertl, H.P., Medenbach, O., Neuser, R.D.UHP metamorphic rocks from Dora Maira, western Alps: cathodluminescence of silica and twinning of coesite.Russian Geology and Geophysics, Vol. 46, 12, pp. 1327-1332.Europe, AlpsUHP - coesite
DS1994-1383
1994
mEdgar, A.D.Pizzolato, L.A, mEdgar, A.D.Petrology and genesis of ultramafic lamprophyres and olivine melilititerocks from Coral Rapids northeast Ontario.Geological Association of Canada (GAC) Abstract Volume, Vol. 19, p.OntarioLamprophyres, Melilitite
DS1996-0175
1996
Medici, L.Brigatti, M.F., Medici, L., Saccani, E., Vaccaro, C.Crystal chemistry and petrologic significance of iron rich phlogopite From the Tapira carbonatite complex.American Mineralogist, Vol. 81, July-Aug. pp. 913-927.BrazilCarbonatite, Deposit -Tapira
DS2001-0133
2001
Medici, L.Brigatti, M.F., Medici, L., Poppi, VaccaroCrystal chemistry of trioctahedral micas 1M from the Alto Paranaiba igneous provinceCanadian Mineralogist, Vol. 39, No. 5, Oct. pp. 1333-46.BrazilAlkaline rocks, Carbonatite
DS200412-0207
2004
Medici, L.Brigatti, M.R., Malferrari, D., Medici, L., Ottolini, L., Poppi, L.Crystal chemistry of apatites from the Tapira carbonatite complex, Brazil.European Journal of Mineralogy, Vol. 16, 4,pp. 677-685.South America, BrazilMineral chemistry
DS200712-0163
2007
Medici, L.Chakhmouradian, A., Medici, L., Rudenja, S.A comprehensive microbeam study of titanian hibschite, a black sheep among garnets.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 96-97.TechnologyGarnet mineralogy
DS200712-0164
2007
Medici, L.Chakhmouradian, A., Medici, L., Rudenja, S.A comprehensive microbeam study of titanian hibschite, a black sheep among garnets.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p. 96-97.TechnologyGarnet mineralogy
DS200812-0193
2008
Medici, L.Chakhmouradian, A.R., Cooper, M.A., Medici, L., Hawthorne, F.C., Adar, F.Fluorine rich hibschite from silicocarbonatite, AfrikAnd a Complex, Russia: crystal chemistry and conditions of crystallization.Canadian Mineralogist, Vol. 46, 4, August pp.RussiaCarbonatite
DS201412-0111
2014
Medici, L.Chakhmouradian, A.R., Cooper, M.A., Ball, N., Reguir, E.P., Medici, L., Abdu, Y., Antonov, A.A.Vladykinite Na3Sr4(Fe2+Fe3+)Si8O24: a new complex sheet silicate from peralkaline rocks of the Murun complex, eastern Siberia, Russia.Deep Seated Magmatism, its sources and plumes, Ed. Vladykin, N.V., pp. 5-21TechnologyAlkalic
DS201412-0555
2014
Medici, L.Martins, T., Chakhmouradian, A.R., Medici, L.Perovskite alteration in kimberlites and carbonatites: the role of kassite, CaTi204(OH)2.Physics and Chemistry of the Earth Parts A,B,C, Vol. 41, 6, pp. 473-484.MantleKimberlite
DS201510-1761
2014
Medici, L.Chakhmouradian, A.R., Cooper, M.A., Ball, N., Reguir, E.P., Medici, L., Abdu, Y., Antonov, A.A.Vladykinite, Na3Sr4(Fe2+Fe3+)Si8024: a new complex sheet silicate from peralkaline rocks of the Murun Complex, eastern Siberia, Russia.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 5-21.Russia, SiberiaDeposit - Murun

Abstract: Vladykinite, ideally Na3Sr4(Fe2+Fe3+)Si8O24, is a new complex sheet silicate occurring as abundant prismatic crystals in a dike of coarse-grained peralkaline feldspathoid syenite in the north-central part of the Murun complex in eastern Siberia, Russia (Lat. 58° 22' 48? N; Long. 119° 03' 44? E). The new mineral is an early magmatic phase associated with aegirine, potassium feldspar, eudialyte, lamprophyllite, and nepheline; strontianite (as pseudomorphs after vladykinite) and K-rich vishnevite are found in the same assemblage, but represent products of late hydrothermal reworking. Vladykinite is brittle, has a Mohs hardness of 5, and distinct cleavage on {100}. In thin section, it is colorless, biaxial negative [a = 1.624(2), b = 1.652(2), g = 1.657(2), 2Vmeas = 44(1)°, 2Vcalc = 45(1)°] and shows an optic orientation consistent with its structural characteristics (X^a = 5.1° in b obtuse, Z^c = 4.7° in b acute, Y = b). The Raman spectrum of vladykinite consists of the following vibration modes (listed in order of decreasing intensity): 401, 203, 465, 991, 968, 915, 348, 167, 129, 264, 1039, and 681 cm–1; O-H signals were not detected. The Mössbauer spectrum indicates that both Fe2+ and Fe3+ are present in the mineral (Fe3+/FeS = 0.47), and that both cations occur in a tetrahedral coordination. The mean chemical composition of vladykinite (acquired by wavelength-dispersive X-ray spectrometry and laser-ablation inductively-coupled-plasma mass-spectrometry), with FeS recast into Fe2+ and Fe3+ in accord with the Mössbauer data, gives the following empirical formula calculated to 24 O atoms: (Na2.45Ca0.56)S3.01(Sr3.81 K0.04Ba0.02La0.02Ce0.01)S3.90(Fe2+0.75Fe3+0.66Mn0.26Zn0.16Al0.12Mg0.05Ti0.01)S2.01(Si7.81Al0.19)S8.00O24. The mineral is monoclinic, space group P21/c, a = 5.21381(13), b = 7.9143(2), c = 26.0888(7) Å, b = 90.3556(7)°, V = 1076.50(5) Å3, Z = 2. The ten strongest lines in the powder X-ray diffraction pattern are [dobs in Å (I) (hkl)]: 2.957 (100) (123, 123); 2.826 (100) (117, 117); 3.612 (58) (114, 114); 3.146 (37) (120); 2.470 (32) (210, 01.10); 4.290 (30) (111, 111); 3.339 (30) (106, 115, 106); 2.604 (28) (200); 2.437 (25) (034); 1.785 (25) (21.10, 234). The structure of vladykinite, refined by single-crystal techniques on the basis of 3032 reflections with Fo > 4sFo to R1 = 1.6%, consists of tetrahedral sheets parallel to (100) and consisting of (Si8O24)16– units incorporating four-membered silicate rings and joined into five- and eight-membered rings by sharing vertices with larger tetrahedra hosting Fe2+, Fe3+, Mn, Zn, Al, Mg, and Ti. Larger cations (predominantly Na, Sr, and Ca) are accommodated in octahedral and square-antiprismatic interlayer sites sandwiched between the tetrahedral sheets. Structural relations between vladykinite and other sheet silicates incorporating four-, five-, and eight-membered rings are discussed. The name vladykinite is in honor of Nikolay V. Vladykin (Vinogradov Institute of Geochemistry, Russia), in recognition of his contribution to the study of alkaline rocks. Holotype and co-type specimens of the mineral were deposited in the Robert B. Ferguson Museum of Mineralogy in Winnipeg, Canada.
DS201512-1903
2015
Medici, L.Chakhmouradian, A.R., Cooper, M.A., Medici, L., Abdu, Y.A., Shelukhina, Y.S.Anzaite-(Ce), a new rare earth mineral and structure type from the AfrikAnd a silicocarbonatite, Kola Peninsula.Mineralogical Magazine, Vol. 79, 5, pp. 1231-1244.RussiaCarbonatite

Abstract: Anzaite-(Ce), ideally Formula Fe2+Ti6O18(OH)2, is a new, structurally complex mineral occurring as scarce minute crystals in hydrothermally altered silicocarbonatites in the Afrikanda alkali-ultramafic complex of the Kola Peninsula, Russia. The mineral is a late hydrothermal phase associated with titanite, hibschite, clinochlore and calcite replacing the primary magmatic paragenesis. The rare-earth elements (REE) (dominated by Ce), Ti and Fe incorporated in anzaite-(Ce) were derived from primary Ti oxides abundant in the host rock. Anzaite-(Ce) is brittle and lacks cleavage; the density calculated on the basis of structural data is 5.054(6) g cm-3. The mineral is opaque and grey with a bluish hue in reflected light; its reflectance values range from 15-16% at 440 nm to 13-14% at 700 nm. Its infrared spectrum shows a prominent absorption band at 3475 cm-1 indicative of OH- groups. The average chemical composition of anzaite-(Ce) gives the following empirical formula calculated on the basis of 18 oxygen atoms and two OH- groups: (Ce2.18Nd0.85La0.41Pr0.26Sm0.08Ca0.36Th0.01)S4.15Fe0.97(Ti5.68Nb0.22Si0.04)S5.94O18(OH)2. The mineral is monoclinic, space group C2/m, a = 5.290(2), b = 14.575(6), c = 5.234(2) Å, ß = 97.233(7)°, V = 400.4(5) Å3, Z = 1. The ten strongest lines in the X-ray micro-diffraction pattern are [dobs in Å (I) hkl]: 2.596 (100) 002; 1.935 (18) 170; 1.506 (14) 133; 1.286 (13) 1.11.0; 2.046 (12) 2I41; 1.730 (12) 003; 1.272 (12) 0.10.2; 3.814 (11) 1I11; 2.206 (9) 061; 1.518 (9) 172. The structure of anzaite-(Ce), refined by single-crystal techniques to R1 = 2.1%, consists of alternating layers of type 1, populated by REE (+ minor Ca) in a square antiprismatic coordination and octahedrally coordinated Fe2+, and type 2, built of five-coordinate and octahedral Ti, stacked parallel to (001). This atomic arrangement is complicated by significant disorder affecting the Fe2+, five-coordinate Ti and two of the four anion sites. The order-disorder pattern is such that only one half of these positions in total occupy any given (010) plane, and the disordered (010) planes are separated by ordered domains comprising REE, octahedral Ti and two anion sites occupied by O2-. Structural and stoichiometric relations between anzaite-(Ce) and other REE-Ti (±Nb, Ta) oxides are discussed. The name anzaite-(Ce) is in honour of Anatoly N. Zaitsev of St Petersburg State University (Russia) and The Natural History Museum (UK), in recognition of his contribution to the study of carbonatites and REE minerals. The modifier reflects the prevalence of Ce over other REE in the composition of the new mineral.
DS1989-0997
1989
Medina, F.Medina, F.Land sat imagery interpretation of Essaouira basin, (Morocco): comparison with geophysical data, and structural implicationsJournal of African Earth Sciences, Vol. 9, No. 1, pp. 69-76MoroccoRemote Sensing, Landsat comparison
DS1860-0004
1860
Medlicott, H.B.Medlicott, H.B.On the Vindhyan Rocks and their Associates in BundelcundIndia Geological Survey Memoir., Vol. 2, No. 1, PP. 65-75.India, Panna, BundelkhandProspecting
DS1860-0236
1874
Medlicott, H.B.Medlicott, H.B.Note on the Habitat in India of the Elastic Sandstone, or So Called Itacolumite.India Geological Survey Records, Vol. 7, No. 1, PP. 30-31.IndiaPetrography
DS1985-0043
1985
Medlycott, A.S.Balfour, D.J., Hegenberger, W., Medlycott, A.S., Wilson, K.J.Kimberlites Near Sikereti, North Eastern Southwest Africa/namibia.Communs. Geological Survey Swa/namibia., Vol. 1, PP. 69-77.Southwest Africa, NamibiaHistory, Pipe, Lithology, Petrography, Xenoliths, Age Of Emplacement
DS201901-0022
2018
Medonca, C.A.Cordani, U.G., Ernesto, M., Da Silva Dias, M.A.F., de Alkmim, F.F., Medonca, C.A., Albrecht, R.Un pouco de historia: as Ciencias da Terra no Brasil colonial e no Imperio. ( IN PORT) History of Brazil gold and diamondsEstudos Avancados ( Ensino de Geosciencias na universidade), Vol. 32, (94), pp. 309-330. pdf available in PORT.South America, Brazilhistory
DS2001-0315
2001
Medori, P.Faurie, C., Ferra, C., Medori, P., Devaux, J.Ecology - science and practiceBalkema Publishing, 340p. $ 50.00 approx.GlobalBook - ad, Ecology
DS202010-1827
2020
Medvedev, N.Ashchepkov, I., Medvedev, N., Vladykin, N., Ivanov, A., Downes, H.Thermobarometry and geochemistry of mantle xenoliths from Zapolyarnaya pipe, Upper Muna field, Yakutia: implications for mantle layering, interaction with plume melts and diamond grade.Minerals, Vol. 10, 9, 740 10.3390/ min10090755 29p. PdfRussia, Yakutiadeposit - Zapplyarnaya

Abstract: Minerals from mantle xenoliths in the Zapolyarnaya pipe in the Upper Muna field, Russia and from mineral separates from other large diamondiferous kimberlite pipes in this field (Deimos, Novinka and Komsomolskaya-Magnitnaya) were studied with EPMA and LA-ICP-MS. All pipes contain very high proportions of sub-calcic garnets. Zapolyarnaya contains mainly dunitic xenoliths with veinlets of garnets, phlogopites and Fe-rich pyroxenes similar in composition to those from sheared peridotites. PT estimates for the clinopyroxenes trace the convective inflection of the geotherm (40-45 mW•m-2) to 8 GPa, inflected at 6 GPa and overlapping with PT estimates for ilmenites derived from protokimberlites. The Upper Muna mantle lithosphere includes dunite channels from 8 to 2 GPa, which were favorable for melt movement. The primary layering deduced from the fluctuations of CaO in garnets was smoothed by the refertilization events, which formed additional pyroxenes. Clinopyroxenes from the Novinka and Komsomolskaya-Magnitnaya pipes show a more linear geotherm and three branches in the P-Fe# plot from the lithosphere base to the Moho, suggesting several episodes of pervasive melt percolation. Clinopyroxenes from Zapolyarnaya are divided into four groups according to thermobarometry and trace element patterns, which show a stepwise increase of REE and incompatible elements. Lower pressure groups including dunitic garnets have elevated REE with peaks in Rb, Th, Nb, Sr, Zr, and U, suggesting mixing of the parental protokimberlitic melts with partially melted metasomatic veins of ancient subduction origin. At least two stages of melt percolation formed the inclined PT paths: (1) an ancient garnet semi-advective geotherm (35-45 mW•m-2) formed by volatile-rich melts during the major late Archean event of lithosphere growth; and (2) a hotter megacrystic PT path (Cpx-Ilm) formed by feeding systems for kimberlite eruptions (40-45 mW•m-2). Ilmenite PT estimates trace three separate PT trajectories, suggesting a multistage process associated with metasomatism and formation of the Cpx-Phl veinlets in dunites. Heating associated with intrusions of protokimberlite caused reactivation of the mantle metasomatites rich in H2O and alkali metals and possibly favored the growth of large megacrystalline diamonds.
DS201612-2274
2016
Medvedev, N.S.Ashchepkov, I.V., Logvinova, A.M., Ntaflos, T., Vladykin, N.V., Kostrovitsky, S.I., Spetsius, Z., Mityukhin, S.I., Prokopyev, S.A., Medvedev, N.S., Downe, H.Alakit and Daldyn kimberlite fields, Siberia, Russia: two types of mantle sub-terranes beneath central Yakutia?Geoscience Frontiers, in press availableRussia, SiberiaDeposit - Alakit, Daldyn

Abstract: Mineral data from Yakutian kimberlites allow reconstruction of the history of lithospheric mantle. Differences occur in compositions of mantle pyropes and clinopyroxenes from large kimberlite pipes in the Alakit and Daldyn fields. In the Alakit field, Cr-diopsides are alkaline, and Stykanskaya and some other pipes contain more sub-calcic pyropes and dunitic-type diamond inclusions, while in the Daldyn field harzburgitic pyropes are frequent. The eclogitic diamond inclusions in the Alakit field are sharply divided in types and conditions, while in the Daldyn field they show varying compositions and often continuous Pressure-Temperature (P-T) ranges with increasing Fe# with decreasing pressures. In Alakit, Cr-pargasites to richterites were found in all pipes, while in Daldyn, pargasites are rare Dalnyaya and Zarnitsa pipes. Cr-diopsides from the Alakit region show higher levels of light Rare Earth Elements (LREE) and stronger REE-slopes, and enrichment in light Rare Earth Elements (LREE), sometimes Th-U, and small troughs in Nb-Ta-Zr. In the Daldyn field, the High Field Strength Elements HFSE troughs are more common in clinopyroxenes with low REE abundances, while those from sheared and refertilized peridotites have smooth patterns. Garnets from Alakit show HREE minima, but those from Daldyn often have a trough at Y and high U and Pb. PTXfO2 diagrams from both regions show similarities, suggesting similar layering and structures. The degree of metasomatism is often higher for pipes which show dispersion in P-Fe# trends for garnets. In the mantle beneath Udachnaya and Aykhal, pipes show 6-7 linear arrays of P-Fe# in the lower part of the mantle section at 7.5-3.0 GPa, probably reflecting primary subduction horizons. Beneath the Sytykanskaya pipe, there are several horizons with opposite inclinations which reflect metasomatic processes. The high dispersion of the P-Fe# trend indicating widespread metasomatism is associated with decreased diamond grades. Possible explanation of the differences in mineralogy and geochemistry of the mantle sections may relate to their tectonic positions during growth of the lithospheric keel. Enrichment in volatiles and alkalis possibly corresponds to interaction with subduction-related fluids and melts in the craton margins. Incorporation of island arc peridotites from an eroded arc is a possible scenario.
DS201909-2016
2019
Medvedev, N.S.Ashchepkov, I., Ivanov, A.S., Kostrovitsky, S.I., Vavilov, M.A., Vladykin, N., Babushkina, S.A., Tychkov, N.S., Medvedev, N.S.Mantle terranes of the Siberian craton: their interaction with plume melts based on thermobarometry and geochemistry of mantle xenocrysts.Solid Earth, Vol. 10, 2, pp. 197-245.Russia, Siberiamelting

Abstract: Variations of the structure and composition of mantle terranes in the terminology of the Siberian craton were studied using database (>60000) EPMA of kimberlite xenocrysts from the pipes of Yakutian kimberlite province (YKP) by a team of investigators from IGM, IGH, IEC and IGBM SB RAS and ALROSA company. The monomineral thermobarometry (Ashchepkov et al., 2010, 2014, 2017) Geochemistry of minerals obtained LA ICP MS was used to determine the protolith, melting degree, Type of the metasomatism . The mantle stratification commonly was formed by 6-7 paleosubduction slabs, separated by pyroxenite, eclogite, and metasomatic horizons and dunite lenses beneath kemberltes . We built mantle sections across the kimberlite field and transects of craton. Within the established tectonic terrains strengthening to thousands km (Gladkochub et al, 2006), the collage of microplates was determined at the mantle level. Under the shields of Anabar and Aldan lower SCLM consist of 3 -4 dunites dunites with Gar-Px-Ilm- Phl nests. Terranes framing protocratons like suture Khapchanskyare are saturated in eclogites and pyroxenites, sometimes dominated probably represent the ascending bodies of igneous eclogites intruding mantle lithosphere (ML). The ubiquitous pyroxenite layer at the level of 3.5-4.5 GPa originated in the early Archaean when melted eclogites stoped stoped subdction. Beneath the Early Archaean granite-greenstone terranes - Tunguskaya, Markhinskaya, Birektinskaya, Shary-Zhalgaiskaya (age to~3.8-3.0 GA) (Gladkochub et al., 2018) the SCLM is less depleted and often metasomatized having flat structures in some subterrains. Daldyn and Magan granulite-orthogneisic terranes have a layered and folded ML seen in N-S sections from Udachnaya to Krasnopresnenskaya less pronounced in latitudinal direction. From Daldyn to Alakit field increases the degree of Phl metasomatism and Cpx alkalinity. The most productive Aykhal and Yubleynaya pipes confined to the dunite core. Within the Magan terrane, the thin-layered SCLM have depleted base horizon. Granite-greenstone Markha terrane contains pelitic eclogites. Central and Northern craton parts show slight inclination of paleoslabs to West. The formation of SCLM in Hadean accompanied by submelting (Perchuk et al., 2018, Gerya, 2014.) had no deep roots. Ultrafine craton nuclei like Anabar shield was framed by steeper slab. During 3.8-3.0 GA craton keel growth in superplume periods (Condie, 2004) when melted eclogites and peridotites acquiring buoyancy of the sinking plate melted. For peridotites, the melting lines calculated from the experimental data (Herzberg, 2004) mainly lie near 5-6 GPA (Ionov et al., 2010; 2015). In classical works all geotherms are conductive (Boyd, 1973), but this is quite rare. The garnet pyroxene geotherms for (Ashchepkov et al., 2017) calculated with most reliable methods (Nimis, Taylor, 2000; McGregor , 1974; Brey Kohler, Nickel Green, 1985; Ashchepkov et al., 2010; 2017) give are sub-adiabatic and are formed during the melt percolation superplume vent often in presence of volatiles (Wyllie, Ryabchikov, 2000) and therefore, after superplumes trends P-Fe# of garnet are smoothed and change the tilts.
DS202007-1124
2020
Medvedev, N.S.Ashchepkov, I.V., Vladykin, N.V., Kalashnyk, H.A., Medvedev, N.S., Saprykin, A.I., Downes, H., Khmelnikova, O.S.Incompatible element enriched mantle lithosphere beneath kimberlitic pipes in Priazovie Ukrainian shield: volatile enriched focused melt flow and connection to mature crust?International Geology Review, in press available 24p. PdfEurope, Ukrainedeposit - Priazovie

Abstract: Major, minor and trace element compositions of mantle xenocrysts from Devonian kimberlite pipes in the Priazovie give an insight into the mantle structure beneath the SE Ukranian Shield and its evolution. Garnets yield low temperature conditions as determined by monomineral thermobarometry. The mantle lithosphere is sharply divided at 4.2 GPa, marked by a high temperature Cpx-Ilm-Phl trend, eclogites and changes in pyrope geochemistry. Seven layers are detected: Ist layer at 2.5-1 GPa is enriched mantle (Fe#Ol ~ 0.11 - 0.14) with Gar- pyroxenites and Sp peridotites; IInd at 2.5-3.2 GPa - Gar-Sp (Fe#Ol 0.08 - 0.10) peridotite. IIId at 4.3-3.2 GPa is formed of Archaean- Proterozoic peridotites with Fe#Ol ~0.07 - 0.095. IVth at 3.2-5 GPa- contains pyroxenitic Gar with higher Ca, eclogites, Chr and Cpx (Fe#Ol ~0.10 - 0.125); Vth at 5.8 - 5 GPa is marked by sub-Ca garnets, Cr-rich chromites and Mg-Cr ilmenites; VIth layer at 5.8-6.8 GPa contains Fe-enriched pyropes, almandines and Cr-Mg ilmenites near the lithosphere base; VIIth layer > 6.8 GPa consists of ‘hot’ Fe-rich garnets. Garnets show increasing enrichment in LREE, LILE, Hf, Zr with decreasing pressure. Primitive garnets have round REE patterns; depleted ones have S-type patterns inflected at Nd. Garnets from 6.5 to 3 GPa show increasing La/Ybn, Zr-Hf, LILE. Peridotitic clinopyroxenes have inclined linear trace element patterns rounded from La to Pr with high LILE and HFSE levels. The Fe-rich group (reacted with eclogites) shows bell-shaped irregular patterns with LILE close to the LREE levels. A possible reason for LILE (HFSE and) enrichment of the upper part of the mantle is subduction metasomatsm in Archaean times (with participation of mature continental sediments) activated by plumes at 1.8 Ga and earlier which produced pervasive focused melt flow with remelting of mica-amphibole metasomatites giving continuous REE and LILE enrichment in mantle lithologies from 5.8 to 2.5 GPa.
DS2003-1409
2003
Medvedev, S.Van der Hagaeghe, O., Medvedev, S., Fullsack, P., Beaumont, C., Jamieson, R.A.Evolution of orogenic wedges and continental plateaux: insights from crustalGeophysical Journal International, Vol. 153, 1, pp. 27-51.MantleGeothermometry, Subduction
DS200412-2035
2003
Medvedev, S.Van der Hagaeghe, O., Medvedev, S., Fullsack, P., Beaumont, C., Jamieson, R.A.Evolution of orogenic wedges and continental plateaux: insights from crustal thermalmechanical models overlying subducting mantlGeophysical Journal International, Vol. 153,1, pp. 27-51.MantleGeothermometry Subduction
DS1990-1031
1990
Medvedev, T.I.Menshagin, I.V., Sekerin, A.P., Medvedev, T.I., Ushchapo.., Z.F.Ist find of priderite in kimberlites of the Irutsk Per-Sayan.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 312, No. 6, pp. 1440-1442RussiaMineralogy, Priderite
DS2002-1041
2002
Medvedev, V.Y.Medvedev, V.Y., Ivanova, Egorov et al.Kelphytic rims around garnet in kimberlites: an experimental studyDoklady, Vol. 381A, No. 9, pp. 1096-8.RussiaPetrology
DS200412-1086
2004
Medvedev, V.Y.Lashkevich, V.V., Medvedev, V.Y., Egorov, K.N., Ivanova, L.A.Experimental and numerical modeling of the metasomatic replacement of picroilmenites from kimberlites.Geochemistry International, Vol. 42, 1, pp. 49-56.RussiaMetasomatism, Deposit - Jubileinaya
DS200512-0714
2005
Medvedev, V.Y.Medvedev, V.Y., Ivanova, L.A., Egorov, K.N., Laskevich, V.V.Formation of kelphytic rims around garnet in kimberlites: experimental and physicochemical modeling.Geochemistry International, Vol. 43, 8, pp. 769-775.RussiaMineral chemistry
DS2001-0766
2001
Medvedev, V.Ya.Medvedev, V.Ya., Egorov, K.N., Ivanova, L.A.Experimental modeling of the regressive transformation of picroilmenites from kimberlite rocks.Doklady Academy of Sciences, Vol. 376, No. 1, Jan-Feb. pp. 54-6.RussiaPetrology - experimental
DS2001-0767
2001
Medvedev, V.Ya.Medvedev, V.Ya., Ivanova, Egorov, Lashkevich, UshchapovKelyphitic rims around garnet in kimberlites: an experimental studyDoklady, Vol.381A, No.9, Nov-Dec. pp. 1096-98.RussiaKimberlite - garnet mineralogy
DS201312-0515
2013
Medvedeva, E.V.Krasnobaev, A.A., Valizer, P.M., Cherednichenko, S.V., Busharina, S.V., Medvedeva, E.V., Presyakov, S.L.Zirconology of carbonate rocks ( marbles-carbonatites) of the Ilmeno-Visnevogorskii complex, southern Urals.Doklady Earth Sciences, Vol. 450, 1, pp. 504-508.Russia, UralsCarbonatite
DS201412-0571
2014
Medvedeva, E.V.Medvedeva, E.V., Rusin, A.I., Krasnobaev, A.A., Baneva, N.N., Valizer, P.M.Structural compositional evolution and isotopic age of Ilmeny Vishnevogorsky complex, south urals, Russia.30th. International Conference on Ore Potential of alkaline, kimberlite and carbonatite magmatism. Sept. 29-, Russia, UralsCarbonatite
DS1980-0232
1980
Medvedeva, M.S.Medvedeva, M.S.Synthesis of Pyrope at Pressures Up to 120 KilobarsGeochemistry International, Vol. 6, SUPPL., PP. 625-627.RussiaKimberlite
DS1989-0127
1989
Medvedeva, M.S.Blinova, G.K., Verzhak, V.V., Zakharchenko, O.D., Medvedeva, M.S.Impurity centers in diamonds from two kimberlite pipes in the Arkhangel diamond provinceSoviet Geology and Geophysics, Vol. 30, No. 8, pp. 122-125RussiaDiamond inclusions, Arkhangel
DS1986-0210
1986
Medvedeva, T.I.Egorov, K.N., Bogdanov, G.V., Medvedeva, T.I.Zonal garnets from kinberlite pipe.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR (Russian), Vol. 290, No. 6, pp. 1463-1467GlobalBlank
DS1988-0192
1988
Medvedeva, T.I.Egorov, K.N., Bogdanov, G.V., Medvedeva, T.I.Zonal garnets with mineral inclusions from kimberlitic pipes of Malobotuobinskii region. (Russian)Izvest. Akad. Nauk Ser. Geol., (Russian), No. 1, January pp. 112-119RussiaBlank
DS1990-1328
1990
Medvedeva, T.I.Sekerin, A.P., Menshagin, I.V., Bogdanov, G.V., Medvedeva, T.I.On the occurrence of basic and ultrabasic inclusions in Precambrian kimberlites of the Peri-Sayan.(Russian)Dokl. Akad., Nauk SSSR, (Russian), Vol. 312, No. 5, pp. 1231-1234RussiaKimberlite, Basic inclusions
DS1992-1362
1992
Medvedeva, T.I.Sekerin, A.P., Menshagin, Yu.V., Bogdanov, G.V., Medvedeva, T.I.Find of mafic and ultramafic inclusions in Precambrian kimberlite from the Sayan regionDoklady Academy of Science USSR, Earth Science Section, Vol. 312, No. 1-3, June pp. 203-205RussiaUltramafic inclusions, Kimberlite
DS201012-0080
2010
Medynski, S.Burnard, P., Toplis, M.J., Medynski, S.Low solubility of He and Ar carbonatitic liquids: implications for decoupling noble gas and lithophile isotope systems.Geochimica et Cosmochimica Acta, Vol. 74, 5, pp. 1672-1683.MantleCarbonatite
DS2003-0926
2003
Meech, J.A.Meech, J.A., Scobie, M., Wilson, W., et al.CERM3 and its contribution to providing sustainable research for the mining industryCanadian Institute Mining Bulletin, Vol. 96, No. 1067, Jan pp.72-81.CanadaEnvironmental research
DS200512-0658
2004
Meeker, G.P.Lowers, H.A., Harrison, W.J., Wendlandt, R.F., Meeker, G.P.Origin of fribrous amphiboles in the Iron Hill carbonatite complex, Gunnison County, Colorado.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 101-3, Vol. 36, 5, p. 246.United States, ColoradoGeochemistry
DS1975-1150
1979
Meeks, D.J.Meeks, D.J.Geology and Petrology of the Cross Kimberlite, Crossing Creek Area.Vancouver: Bsc. Thesis University British Columbia., 31P.Canada, British ColumbiaGeology
DS1900-0581
1907
Meeks, R.Meeks, R.Precious Stones in Foreign CountriesThe Mineral Industry During 1906, Vol. 15, P. 668.Africa, South Africa, Brazil, Australia, New South WalesDiamonds, Current Activities, Mineral Resources, De Beers, Pre
DS1985-0435
1985
Meen, J.K.Meen, J.K.Production of Carbonatite Source Regions in Depleted Upper Mantle: Metasomatism by Alkaline Rocks.Geological Society of America (GSA), Vol. 17, No. 7, P. 661. (abstract.).GlobalExperimental Petrology
DS1986-0557
1986
Meen, J.K.Meen, J.K., Ayers, J.C., Fregeau, E.J.The stability of Zirconium and Phosphorus bearing minerals in peridotite coexisting with alkaline melts. Implications for the storage of Uranium and Thorium in the mantleGeological Association of Canada (GAC) Annual Meeting, Vol. 11, p. 101. (abstract.)GlobalMantle
DS1986-0558
1986
Meen, J.K.Meen, J.K., Eggler, D.H., McCallum, M.E.Proterozoic granulite xenoliths from Ming bar diatremeGeological Society of America (GSA) Abstract Volume, Vol. 18, No. 6, p. 692. (abstract.)MontanaBlank
DS1986-0559
1986
Meen, J.K.Meen, J.K., Hartley, P.Control of potash contents of arc volcanics by pressure of fractionation of parental basalts- experimental evidenceGeological Society of America (GSA) Abstract Volume, Vol. 18, No. 6, p. 692. (abstract.)MontanaAbsaroka, shoshonites
DS1987-0462
1987
Meen, J.K.Meen, J.K.Mantle metasomatism and carbonatites: an experimental study of a complexrelationshipMantle metasomatism and alkaline magmatism, edited E. Mullen Morris and, No. 215, pp. 91-100GlobalBlank
DS1987-0463
1987
Meen, J.K.Meen, J.K.Formation of shoshonites from calc alkaline basalt magmas:geochemical and experimental constraints from the type localityContributions to Mineralogy and Petrology, Vol. 97, No. 3, pp. 333-351WyomingShoshonite
DS1988-0190
1988
Meen, J.K.Eggler, D.H., Meen, J.K., Welt, F., Dudas, F.O., Furlong, K.P.Tectonomagmatism of the Wyoming ProvinceColorado School of Mines Quarterly, Vol. 83, No. 2, Summer pp. 25-40Wyoming, MontanaMetasomatism, xenoliths, lithosphere, Missouri Breaks, kimberlites
DS1988-0457
1988
Meen, J.K.Meen, J.K.Mineral assemblages in veins formed by ijolite peridotitereaction.Implications for melting of SCUM.V.m. Goldschmidt Conference, Program And Abstract Volume, Held May, p. 60. AbstractGlobalBlank
DS1989-0319
1989
Meen, J.K.Curtis, P.C., Meen, J.K., Glazner, A.F.Liquid lines of descent in alkalic continental riftmagmas; petrologic, geochemical, and experimental constraints from the East African riftNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 65. AbstractEast Africa, KenyaTectonics
DS1989-0569
1989
Meen, J.K.Haines, S.M., Meen, J.K.Igneous and metamorphic continental crust beneath the Valley and Ridge ofVirginia: evidence from xenolithsGeological Society of America (GSA) Abstract Volume, Vol. 21, No. 3, p.19. (Abstract only)GlobalMantle
DS1989-0998
1989
Meen, J.K.Meen, J.K., Ayers, J.C.Cryptic metasomatism and creation of melts with depleted contents of the high field strength elements:coupled effects due to infiltration of melt intoharzNew Mexico Bureau of Mines Bulletin., Continental Magmatism Abstract Volume, Held, Bulletin. No. 131, p. 185. AbstractGlobalHarzburgite
DS1989-0999
1989
Meen, J.K.Meen, J.K., Ayers, J.C., Fregeau, E.J.A model of mantle metasom. by carb. alkaline melts:trace element and isotopic compositions of mantle source regions of carbonatite and cont. igneousrocksCarbonatites -Genesis and Evolution, Ed. K. Bell Unwin Hyman Publ, pp. 464-499GlobalMetasomatism, Ijolite-Peridotite
DS1989-1000
1989
Meen, J.K.Meen, J.K., Curtis, P.C.What are shoshonites?Eos, Vol. 70, No. 43, October 24, p. 1421. AbstractGlobalShoshonite
DS1989-1001
1989
Meen, J.K.Meen, J.K., Eggler, D.H.Chemical and isotopic compositions of Absaroka granitoids southwesternMontana. Evidence for Deep seated Archean amphibolite basement BeartoothRegionContributions to Mineralogy and Petrology, Vol. 102, No. 4, pp. 462-477MontanaGeochronology
DS1989-1002
1989
Meen, J.K.Meen, J.K., Eggler, D.H., Ayers, A.H.C.Experimental evidence for very low solubility of rareearth elements inCO2 rich fluids at mantle conditions #1Nature, Vol. 340, No. 6231, July 27, pp. 301-302GlobalMantle
DS1990-1026
1990
Meen, J.K.Meen, J.K.Mineral chemistry of a layered sequence of ultramafic rocks of the Hall Cove Complex, Duke Island, AlaskaEos, Vol. 71, No. 43, October 23, p. 1678 AbstractAlaskaUltramafics, Hall Cove
DS1990-1027
1990
Meen, J.K.Meen, J.K., Bloomer, S.H., Stern, R.J.Contemporaneous alkaline shoshonite and island arcbasalt-dacite magmatism in the Mariana arc systemV.m. Goldschmidt Conference Held May 2-4, 1990, Program And Abstract, p. 65. Abstract onlyGlobalShoshonite, Alkaline rocks
DS1991-0667
1991
Meen, J.K.Harlan, S.S., Mehnert, H.H., Snee, L.W., Meen, J.K.Preliminary isotopic (K-Ar and 40Ar/38Ar) age determinations from selected Late Cretaceous and Tertiary igneous rocks in MontanaGuidebook of the Central Montana Alkalic Province, ed. Baker, D.W., Berg. R., No. 100, pp. 136. extended abstractMontanaGeochronology, Igneous rocks
DS1991-1116
1991
Meen, J.K.Meen, J.K., Ross, D.K., Elthon, D.Gabbros and ultramafic rocks of Duke Island, southeastern Alaska:differences and similarities of mafic magmas during arc evolutionEos, Spring Meeting Program And Abstracts, Vol. 72, No. 17, April 23, p. 293AlaskaUltramafics, Geochemistry
DS1992-1042
1992
Meen, J.K.Meen, J.K.Evidence for the amalgamation of Archean oceanic and continental blocks to form the Beartooth Plateau.8th. International Basement Tectonics, pp. 299-311.MontanaStructure, Lithosphere
DS1992-1043
1992
Meen, J.K.Meen, J.K., Rogers, J.J.W., Fullagar, P.D.Lead isotopic compositions of the Western Dharwar Craton, southern India:evidence for the distinct Middle Archean terranes in a Late Archean cratonGeochimica et Cosmochimica Acta, Vol. 56, No. 6, June, pp. 2455-2470IndiaGeochronology, Craton
DS200612-1085
2006
Meen, J.K.Pesslier, A.H., Luhr, J.F., Woodland, A.B., Wolff, J.A., Meen, J.K.Estimating alkali basalt and kimberlite magma ascent rates using H diffusion profiles in xenolithic mantle olivine.Geochimica et Cosmochimica Acta, Vol. 70, 18, 1, p. 19, abstract only.MantleMagmatism
DS201412-0719
2013
Meena, S.Rai, S.Borah, Kajaljyoti, Das, Gupta, R., Srivastava, S., Shalivahan, P., Sivaram, K., Kumar, K., Meena, S.The South India Precambrian crust and shallow lithospheric mantle: initial results from the India Deep Imaging Experiment ( INDEX).Journal of Earth System Science, Vol. 122, 6, pp. 1435-1453.IndiaDrilling
DS201810-2373
2018
Meenan, C.Roberts, G.G., White, N., Hoggard, M.J., Ball, P.W., Meenan, C.A Neogene history of mantle convective support beneath Borneo.Earth and Planetary Science Letters, Vol. 496, 1, pp. 142-158.Asia, Borneoconvection

Abstract: Most, but not all, geodynamic models predict 1-2 km of mantle convective draw-down of the Earth's surface in a region centered on Borneo within southeast Asia. Nevertheless, there is geomorphic, geologic and geophysical evidence which suggests that convective uplift might have played some role in sculpting Bornean physiography. For example, a long wavelength free-air gravity anomaly of +60 mGal centered on Borneo coincides with the distribution of Neogene basaltic magmatism and with the locus of sub-plate slow shear wave velocity anomalies. Global positioning system measurements, an estimate of elastic thickness, and crustal isostatic considerations suggest that regional shortening does not entirely account for kilometer-scale regional elevation. Here, we explore the possible evolution of the Bornean landscape by extracting and modeling an inventory of 90 longitudinal river profiles. Misfit between observed and calculated river profiles is minimized by smoothly varying uplift rate as a function of space and time. Erosional parameters are chosen by assuming that regional uplift post-dates Eocene deposition of marine carbonate rocks. The robustness of this calibration is tested against independent geologic observations such as thermochronometric measurements, offshore sedimentary flux calculations, and the history of volcanism. A calculated cumulative uplift history suggests that kilometer-scale Bornean topography grew rapidly during Neogene times. This suggestion is corroborated by an offshore Miocene transition from carbonate to clastic deposition. Co-location of regional uplift and slow shear wave velocity anomalies immediately beneath the lithospheric plate implies that regional uplift could have been at least partly generated and maintained by temperature anomalies within an asthenospheric channel.
DS2001-0812
2001
Meere, P.A.Mulchrone, K.F., Meere, P.A.A windows program for the analysis of tectonic strain using deformed elliptical markers.Computers and Geosciences, Vol. 27, No. 10, pp. 1251-55.GlobalComputer, Tectonics
DS2003-1069
2003
MeertPersonen, L.J., Elming, Mertansen, Pisarvesky, D' Agrilla Filho, Meert, SchmidtPaleomagnetic configuration of continents during the ProterozoicTectonophysics, Vol. 375, 1-4, pp. 289-324.MantleMagnetics
DS200412-1532
2003
MeertPersonen, L.J., Elming, Mertansen, Pisarvesky, D' Agrilla Filho, Meert, Schmidt, Abrahamsen, BylundPaleomagnetic configuration of continents during the Proterozoic.Tectonophysics, Vol. 375, 1-4, pp. 289-324.MantleMagnetics
DS2002-0473
2002
Meert, J.Foster, D.A., Mueller, P.A., Heatherington, A., Vogl, J., Meert, J., Lewis, R.Configuration of the 2.0 - 1.6 GA accretionary margin NW of the Wyoming Province:Geological Society of America Annual Meeting Oct. 27-30, Abstract p. 559.WyomingTectonics, Gondwana
DS1991-1778
1991
Meert, J.G.Van der Voo, R., Meert, J.G.Late Proterozoic paleomagnetism and tectonic models: a critical appraisalPrecambrian Research, Vol. 53, pp. 149-163South Africa, Democratic Republic of CongoTectonics,, Proterozoic
DS1993-1016
1993
Meert, J.G.Meert, J.G.A plate tectonic speed limit?Nature, Vol. 363, May 20, pp. 216-217MantlePolar wander paths
DS1995-1225
1995
Meert, J.G.Meert, J.G.The formation and breakup of a late Proterozoic supercontinent: integratedpaleomagnetic, geochronologyGeological Association of Canada (GAC)/Mineralogical Association of Canada (MAC) Annual Meeting Abstracts, Vol. 20, p. A69 AbstractGlobalPaleomagnetics, Gondwana Supercontinent
DS1995-1226
1995
Meert, J.G.Meert, J.G., Toravik, T.H.Superplumes and the breakup of RodiniaEos, Vol. 76, No. 46, Nov. 7. p.F588. Abstract.GondwanaPlumes, Geodynamics, tectonics
DS1995-1227
1995
Meert, J.G.Meert, J.G., Van der Voo, R.The making of Gondwana 800 - 550 MaGeological Society of America (GSA) Abstracts, Vol. 27, No. 6, abstract p. A 339.MantleGondawana
DS1995-1920
1995
Meert, J.G.Torsvik, T.H, Meert, J.G.Superchrons and supercontinentsEos, Vol. 76, No. 46, Nov. 7. p.F172. Abstract.MantleRodinia, Gondwana, Pangea
DS1996-0940
1996
Meert, J.G.Meert, J.G., Torsvik, T.H., Eide, E.E.Paleomagnetic investigation of the NeoProterozoic Fen Carbonatite Complex:contraints on rifting...Geological Society of America, Abstracts, Vol. 28, No. 7, p. A-494.NorwayTectonics - Neoproterozoic, Laurentia, Baltica
DS1996-0941
1996
Meert, J.G.Meert, J.G., Van der Voo, R.Paleomagnetic and 40 Ar- 39 Ar study of the Sinyai dolerite, Kenya:implications for Gondwana assembly.Journal of Geology, Vol. 104, pp. 131-42.KenyaTectonics, Gondwana, Kuunga Orogeny, Geochronology, argon
DS1996-1436
1996
Meert, J.G.Torsvik, T.H., Smethurst, M.A., Meert, J.G., Van de VooContinental breakup and collision in the Neoproterozoic and Paleozoic - atale of Baltica and Laurentia.Earth Science Reviews, Vol. 40, pp. 229-258.Baltica, Laurentia, Rodinia, PangeaSupercontinent, Tectonics
DS1997-0758
1997
Meert, J.G.Meert, J.G., Van der Voo, R.The assembly of Gondwana 800- 550 MaJournal of Geodynamics, Vol. 23, No. 3-4, pp. 223-236.Tectonics
DS1999-0467
1999
Meert, J.G.Meert, J.G.A paleomagnetic analysis of Cambrian true polar wanderEarth and Planetary Science Letters, Vol. 169, No. 1-2, Apr. 30, pp. 131-44.GlobalPaleomagnetism, Polar wander path
DS1999-0468
1999
Meert, J.G.Meert, J.G., Torsvik, T.H., Eide, E.A., Dahlgren, S.Tectonic significance of the Fen Province: constraints from geochronology and PaleomagnetismJournal of Geology, Vol. 106, No. 5, Sept. pp. 553-64.NorwayTectonics, Dikes
DS2002-1042
2002
Meert, j.G.Meert, j.G.Rodinia: problems, issues and acronymsGeological Society of America Annual Meeting Oct. 27-30, Abstract p. 558.GondwanaTectonics - rifts
DS2003-0927
2003
Meert, J.G.Meert, J.G.A synopsis of events related to the assembly of eastern GondwanaTectonophysics, Vol. 362, 1-4, pp. 1-40.Tectonics
DS2003-0928
2003
Meert, J.G.Meert, J.G., Torsvik, T.H.The making and unmaking of a supercontinent: Rodinia revisitedTectonophysics, Vol. 375, 1-4, pp. 261-88.MantleRodinia, Tectonics
DS200412-1287
2003
Meert, J.G.Meert, J.G., Torsvik, T.H.The making and unmaking of a supercontinent: Rodinia revisited.Tectonophysics, Vol. 375, 1-4, pp. 261-88.MantleRodinia, Tectonics
DS200612-0497
2006
Meert, J.G.Gregory, L.C., Meert, J.G., Pradhan, V., Pandit, M.K., Tamrat, E., Malone, S.J.A paleomagnetic and geochronologic study of the Majhgawan kimberlite. India: implications for the age of the Upper Vindhyan Supergroup.Precambrian Research, Vol. 149, 1-2, pp. 65-75.IndiaDeposit - Majhgawan, geophysics, geochronology
DS201012-0490
2010
Meert, J.G.Meert, J.G., Pandit, M.K., Pradhan, V.R., Banks, J., Sirianni, R., Stroud, M., Newstead, B., Gifford, J.Precambrian crustal evolution of Peninsular India: a 3.0 billion year odyssey.Journal of Asian Earth Sciences, Vol. 39, 6, pp. 483-515.IndiaGeodynamics, tectonics
DS201012-0596
2010
Meert, J.G.Pradhan, V.R., Meert, J.G., Pandit, M.K., Kamenov, G., Gregory, L.C., Malone, S.J.India's changing place in global Proterozoic reconstructions: a review of geochronologic constraints and paleomagnetic poles from the Dharwar Bundelk hand and MarwarJournal of Geodynamics, Vol. 50, 3-4, pp. 224-242.IndiaCraton, crustal evolution
DS201012-0805
2010
Meert, J.G.Turner, C.C., Meert, J.G., Kamenov, G.D., Pandit, M.K.A detrital zircon transect across the Son Valley sector of the Vindhyan Basin, India: further constraints on basin evolution.Geological Society of America Abstracts, 1/2p.IndiaKimberlite
DS201112-0662
2011
Meert, J.G.Meert, J.G., Pandit, M.K.,Pradham, V.R., Kamenov, G.Preliminary report on the paleomagnetism of 1.88 Ga dykes from the Bastar and Dharwar cratons, Peninsular India.Gondwana Research, Vol. 20, 2-3, pp. 335-343.IndiaDyke system
DS201212-0458
2012
Meert, J.G.Meert, J.G.What's in a name? The Columbia (Paleopangaea/Nuna) supercontinent.Gondwana Research, Vol. 21, 4, pp. 987-993.GlobalSupercontinents
DS201212-0572
2012
Meert, J.G.Pradham, V.R., Meert, J.G., Pandit, M.K., Kamenov, G., Mondal, E.F.A.Paleomagnetic and geochronological studies of the mafic dyke swarms of Bundelk hand craton, central India: implications for the tectonic evolution and paleogeographic reconstructions.Precambrian Research, in press available, 80p.IndiaDeposit - Bunder
DS201611-2105
2016
Meert, J.G.Fedorova, N.M., Bzhenov, M.L., Meert, J.G., Kuznetsov, N.B.Edicaran-Cambrian paleogeography of Baltica: a paleomagnetic view from a diamond pit on the White Sea east coast.Lithosphere, Vol. 8, 5, pp. 564-573.Russia, Baltic ShieldPaleogeography

Abstract: The controversial late Ediacaran to Cambrian paleogeography is largely due to the paucity and low reliability of available paleomagnetic poles. Baltica is a prime example of these issues. Previously published paleomagnetic results from a thick clastic sedimentary pile in the White Sea region (northern Russia) provided valuable Ediacaran paleontological and paleomagnetic data. Until recently, Cambrian-age rocks in northern Russia were known mostly from boreholes or a few small outcrops. A recent mining operation in the Winter Coast region exposed >60 m of red sandstone and siltstone of the Cambrian Brusov Formation from the walls of a diamond pit. Paleomagnetic data from these rocks yield two major components. (1) A single-polarity A component is isolated in ~90% of samples between 200 and 650 °C. The corresponding pole (Pole Latitutde, Plat = 20°S; Pole Longitude, Plong = 227°E, a95 = 7°) agrees with the Early Ordovician reference pole for Baltica. (2) A dual-polarity B component is identified in ~33% of samples, mostly via remagnetization circles, isolated from samples above 650 °C. The corresponding pole (Plat = 12°S; Plong = 108°E, a95 = 5°) is close to other late Ediacaran data but far from all younger reference poles for Baltica. We argue for a primary magnetization for the B component and the secondary origin of the other Cambrian poles from Baltica. This in turn requires a major reshuffling of all continents and blocks around the North Atlantic. The early stages of Eurasia amalgamation and models for the evolution of the Central Asian Orogenic Belt require revision.
DS201709-2031
2017
Meert, J.G.Meert, J.G., Santosh, M.The Columbia supercontinent revisited.Gondwana Research, Vol. 50, pp. 67-83.Globalsupercontinent

Abstract: Just over 15 years ago, a proposal forwarded by Rogers and Santosh (2002) posited the existence of a pre-Rodinia supercontinent which they called Columbia. The conjecture invigorated research into the Paleo-Mesoproterozoic interval that was; in our opinion, inappropriately dubbed ‘the boring billion’. Given the wealth of new information about the supercontinent, this review paper takes a careful look at the paleomagnetic evidence that is used to reconstruct Columbia. Our contribution represents a status report and indicates that; despite the exponential increase in available data, knowledge of the assembly, duration and breakup history of the supercontinent are contentious. The commonality of ~ 1.7–2.1 Ga orogenic systems around the globe are indicative of major changes in paleogeography and growth of larger landmasses. There is continued discussion about the interconnectedness of those orogenic systems in a global picture. Arguments for Columbia posit a ~ 1500–1400 Ma age for maximum packing. Paleomagnetic data from many of the constituent cratons during the 1500–1400 Ma interval can be interpreted to support a large landmass, but the consistency of the proposal cannot be reliably demonstrated for earlier or later times. One of the more intriguing advances are the apparent long-lived connections between Laurentia, Siberia and Baltica that may have formed the core of both Columbia and Rodinia.
DS201710-2247
2017
Meert, J.G.Meert, J.G., Pandit, M.K., Pivarunas, A., Katusin, K., Sinha, A.K.India and Antarctica in the Precambrian: a brief analysis.Geological Society of London Special Publication, Vol. 457, pp. 339-351.IndiaTectonics

Abstract: In this short paper, we outline the potential links between India and the East Antarctica region from Enderby Land to Princess Elizabeth Land using the Mesozoic East Gondwana configuration as a starting point. Palaeomagnetic data indicate that East Gondwana did not exist prior to the Ediacaran-Cambrian. Early Neoproterozoic (1050-950 Ma) deformation in East Antarctica and along the Eastern Ghats Province in India marks the initial contact between the two regions. Volcanism in the Kerguelen hotspot led to final break-up of India and East Antarctica in the Cretaceous. Although connections between the Archaean and Proterozoic provinces of India and East Antarctica have been proposed, the current record of large igneous provinces (or dyke swarms), palaeomagnetic data and geochronology do not show a consistently good match between the two regions.
DS201908-1811
2019
Meert, J.G.Santosh, M., Maruyama, S., Sawaki, Y., Meert, J.G.The Cambrian explosion: plume-driven birth of the second ecosystem on Earth. Gondwana Research, doi.org/10.1016 /j.gr.2013.03.013 21p. PdfAfrica, Mozambiquetectonics

Abstract: The birth of modern life on Earth can be linked to the adequate supply of nutrients into the oceans. In this paper, we evaluate the relative supply of nutrients into the ocean. These nutrients entered the ocean through myriad passageways, but primarily through accelerated erosion due to uplift. In the ‘second ecosystem’, uplift is associated with plume-generation during the breakup of the Rodinia supercontinent. Although the evidence is somewhat cryptic, it appears that the second ecosystem included the demospongia back into the Cryogenian (~ 750 Ma). During the Ediacaran-Cambrian interval, convergent margin magmatism, arc volcanism and the closure of ocean basins provided a second pulse of nutrient delivery into the marine environment. A major radiation of life forms begins around 580 Ma and is represented by the diverse and somewhat enigmatic Ediacaran fauna followed by the Cambrian Explosion of modern phyla during the 540-520 Ma interval. Tectonically, the Ediacaran-Cambrian time interval is dominated by the formation of ultra-high pressure (UHP), high pressure (HP) and ultra-high temperature (UHT) orogenic belts during Gondwana orogenesis. Erosion of this extensive mountainous region delivered vast nutrients into the ocean and enhanced the explosiveness of the Cambrian radiation. The timing of final collisional orogeny and construction of the mountain belts in many of the Gondwana-forming orogens, particularly some of those in the central and eastern belts, post-date the first appearance of modern life forms. We therefore postulate that a more effective nutrient supply for the Cambrian radiation was facilitated by plume-driven uplift of TTG crust, subsequent rifting, and subduction-related nutrient systems prior to the assembly of Gondwana. In the outlined scenario, we propose that the birth of the ‘second ecosystem’ on our planet is plume-driven.
DS2003-0929
2003
Mees, F.Mees, F., Swennen, R., Van Geet, M., Jacobs, P.Applications of X ray computed tomography in the GeosciencesGeological Society of London Publ., http://bookshop.geolsoc.org.uk, SP 215, 256p. approx. $110.USGlobalBook - tomography - general interest
DS200412-1288
2003
Mees, F.Mees, F., Swennen, R., Van Geet, M., Jacobs, P.Applications of X ray computed tomography in the Geosciences.Geological Society of London , SP 215, 256p. approx. $110.USTechnologyBook - tomography
DS202008-1373
2020
Mees, F.Buyse, F., Dewaele, S., Decree, S., Mees, F.Mineralogical and geochemical study of the rare earth element mineralization at Gakara ( Burundi).Ore Geology Reviews, Vol. 124, 103659 10p. PdfAfrica, BurundiREE

Abstract: The rare earth element (REE) mineralization of Gakara (Burundi) has first been discovered in 1936 and has periodically been the subject of geological studies, at times when the exploitation of bastnäsite-(Ce) and monazite-(Ce) was economically interesting. This study focuses on the establishment of a mineral paragenesis for Gakara, with special attention to the REE-bearing phases, to understand the formation history of the deposit. The paragenesis can be subdivided into 3 stages: primary ore deposition, brecciation stage and supergene alteration. Evidence for fenitization processes (i.e. pinkish-red cathodoluminescence of K-feldpar, brecciation stage) and the strong enrichment of light REEs in bastnäsite and monazite substantiate the hypothesis of a structurally controlled hydrothermal mineralization with a strong carbonatitic affinity. This likely confirms the association of the Gakara REE deposit with the Neoproterozoic alignment of alkaline complexes and carbonatites along the present-day Western Rift. It suggests a direct link with a - currently unidentified - carbonatitic body at depth, possibly derived from a predominantly metasomatized lithospheric mantle.
DS1997-1235
1997
Meese, D.A.Weis, D., Demaiffe, D., Meese, D.A.Ice sheet development in Central Greenland: implications neodymium Strontium, lead isotopic compositions of basal...Earth and Planetary Science Letters, Vol. 150, No. 1-2, July pp. 161-GreenlandGeomorphology, Till, basal materials
DS1994-1163
1994
Meet, J.G.Meet, J.G., Hargraves, R.B., Van der Voo, R., HallPaleomagnetic and 40Ar/39Ar studies of Late Kebaran intrusives in Burundi:Proterozoic supercontinentsJournal of Geology, Vol. 102, No. 6, Nov. pp. 621-638GlobalGeochronology, Proterozoic, Rodinia
DS2002-1638
2002
MeetsersVan den Berg, E.H., Meetsers, Kenter, SchlagerAutomated separation of touching grains in digital images of thin sectionsComputers and Geosciences, Vol. 28, No. 2, Feb. pp. 179-90.GlobalComputers, Thin sections - not specific to diamonds
DS2001-0564
2001
Meffre, S.Kamenetsky, V.S., Crawford, A.J., Meffre, S.Factors controlling chemistry of magmatic spinel: an empirical study of associated olivine, chromium spinel meltJournal of Petrology, Vol. 42, No. 4, pp. 655-71.MantleChemistry, Inclusions from primitive rocks
DS200412-0385
2004
Meffre, S.Crawford, A.J., Meffre, S., Symonds, P.A.120 to 0 Ma tectonic evolution of the southwest Pacific and analogous geological evolution of the 600 to 220 Ma Tasman Fold BeltHillis, R.R., Muller, R.D. Evolution and dynamics of the Australian Plate, Geological Society America Memoir, No. 372, pp. 383-404.AustraliaTectonics
DS201811-2618
2019
Meffre, S.Xie, Y., Qu, Y., Zhong, R., Verplanck, P.L., Meffre, S., Xu, D.The ~1.85 Ga carbonatite in north China and its implications on the evolution of the Columbia supercontinent.Gondwana Research, Vol. 65, pp. 125-141.Chinacarbonatite

Abstract: Mantle-derived carbonatites provide a unique window in the understanding of mantle characteristics and dynamics, as well as insight into the assembly and breakup of supercontinents. As a petrological indicator of extensional tectonic regimes, Archean/Proterozoic carbonatites provide important constraints on the timing of the breakup of ancient supercontinents. The majority of the carbonatites reported worldwide are Phanerozoic, in part because of the difficulty in recognizing Archean/Proterozoic carbonatites, which are characterized by strong foliation and recrystallization, and share broad petrologic similarities with metamorphosed sedimentary lithologies. Here, we report the recognition of a ~1.85?Ga carbonatite in Chaihulanzi area of Chifeng in north China based on systematic geological, petrological, geochemical, and baddeleyite U-Pb geochronological results. The carbonatite occurs as dikes or sills emplaced in Archean metasedimentary rocks and underwent intense deformation. Petrological and SEM/EDS results show that calcite and dolomite are the dominant carbonate minerals along with minor and varied amounts of Mg-rich mafic minerals, including forsterite (with Fo?>?98), phlogopite, diopside, and an accessory amount of apatite, baddeleyite, spinel, monazite, and ilmenite. The relatively high silica content together with the non-arc and OIB-like trace element signatures of the carbonatite indicates a hot mantle plume as the likely magma source. The depleted Nd isotopic signatures suggest that plume upwelling might be triggered by the accumulation of recycled crust in the deep mantle. As a part of the global-scale Columbia supercontinent, the Proterozoic tectonic evolution of the North China Craton (NCC) provides important insights into the geodynamics governing amalgamation and fragmentation of the supercontinent. The Paleo-Mesoproterozoic boundary is the key point of tectonic transition from compressional to extensional settings in the NCC. The newly identified ~1.85?Ga carbonatite provides a direct link between the long-lasting supercontinental breakup and plume activity, which might be sourced from the “slab graveyard,” continental crustal slabs subducted into asthenosphere, beneath the supercontinent. The carbonatite provides a precise constraint of the initiation of the continental breakup at ~1.85?Ga.
DS201812-2900
2019
Meffre, S.Xie, Y., Qu, Y., Zhong, R., Verplanck, P.L., Meffre, S., Xu, D.The ~1/85 carbonatite in north China and its implications on the evolution of the Columbia supercontinent.Gondwana Research, Vol. 65, pp. 125-141.Chinacarbonatite

Abstract: Mantle-derived carbonatites provide a unique window in the understanding of mantle characteristics and dynamics, as well as insight into the assembly and breakup of supercontinents. As a petrological indicator of extensional tectonic regimes, Precambrian carbonatites provide important constraints on the timing of the breakup of ancient supercontinents. The majority of the carbonatites reported worldwide are Phanerozoic, in part because of the difficulty in recognizing Precambrian carbonatites, which are characterized by strong foliation and recrystallization, and share broad petrologic similarities with metamorphosed sedimentary lithologies. Here we report the recognition of a ~1.85?Ga carbonatite in Chaihulanzi area of Chifeng in north China based on systematic geological, petrological, geochemical, and baddeleyite U-Pb geochronological results. The carbonatite occurs as dikes or sills emplaced in Archean metasedimentary rocks and underwent intense deformation. Petrological and SEM/EDS results show that calcite and dolomite are the dominant carbonate minerals along with minor and varied amounts of Mg-rich mafic minerals, including forsterite (with Fo?>?98), phlogopite, diopside, and an accessory amount of apatite, baddeleyite, spinel, monazite, and ilmenite. The relatively high silica content together with the non-arc and OIB-like trace element signatures of the carbonatite indicates a hot mantle plume as the likely magma source. The depleted Nd isotopic signatures suggest that plume upwelling might be triggered by the accumulation of recycled crust in the deep mantle. As a part of the global-scale Columbia supercontinent, the Proteozoic tectonic evolution of the North China Craton (NCC) provides important insights into the geodynamics governing amalgamation and fragmentation of the supercontinent. The Paleo-Mesoproterozoic boundary is the key point of tectonic transition from compressional to extensional settings in the NCC. The newly-identified ~1.85?Ga carbonatite provides a direct link between the long-lasting supercontinental breakup and plume activity, which might be sourced from the “slab graveyard”, continental crustal slabs subducted into asthenosphere, beneath the supercontinent. The carbonatite provides a precise constraint of the initiation of the continental breakup at ~1.85?Ga.
DS201901-0092
2018
Meffre, S.Xie, Y., Qu, Y., Zhong, R., Verplanck, P.L., Meffre, S., Xu, D.The ~1.85 GA carbonatite in north China and its implications on the evolution of the Columbia supercontinent. Chaitulanzi, ChifengGondwana Research, Vol. 65, pp. 135-141.Chinacarbonatite

Abstract: Mantle-derived carbonatites provide a unique window in the understanding of mantle characteristics and dynamics, as well as insight into the assembly and breakup of supercontinents. As a petrological indicator of extensional tectonic regimes, Precambrian carbonatites provide important constraints on the timing of the breakup of ancient supercontinents. The majority of the carbonatites reported worldwide are Phanerozoic, in part because of the difficulty in recognizing Precambrian carbonatites, which are characterized by strong foliation and recrystallization, and share broad petrologic similarities with metamorphosed sedimentary lithologies. Here we report the recognition of a ~1.85?Ga carbonatite in Chaihulanzi area of Chifeng in north China based on systematic geological, petrological, geochemical, and baddeleyite U-Pb geochronological results. The carbonatite occurs as dikes or sills emplaced in Archean metasedimentary rocks and underwent intense deformation. Petrological and SEM/EDS results show that calcite and dolomite are the dominant carbonate minerals along with minor and varied amounts of Mg-rich mafic minerals, including forsterite (with Fo?>?98), phlogopite, diopside, and an accessory amount of apatite, baddeleyite, spinel, monazite, and ilmenite. The relatively high silica content together with the non-arc and OIB-like trace element signatures of the carbonatite indicates a hot mantle plume as the likely magma source. The depleted Nd isotopic signatures suggest that plume upwelling might be triggered by the accumulation of recycled crust in the deep mantle. As a part of the global-scale Columbia supercontinent, the Proteozoic tectonic evolution of the North China Craton (NCC) provides important insights into the geodynamics governing amalgamation and fragmentation of the supercontinent. The Paleo-Mesoproterozoic boundary is the key point of tectonic transition from compressional to extensional settings in the NCC. The newly-identified ~1.85?Ga carbonatite provides a direct link between the long-lasting supercontinental breakup and plume activity, which might be sourced from the “slab graveyard”, continental crustal slabs subducted into asthenosphere, beneath the supercontinent. The carbonatite provides a precise constraint of the initiation of the continental breakup at ~1.85?Ga.
DS201902-0294
2018
Meffre, S.Malyeshev, S.V., Pasenko, A.M., Ivanov, A.V., Gladkochub, D.P., Savatenkov, V.M., Meffre, S., Abersteiner, A., Kamenetsky, V.S., Shcherbakov, V.D.Geodynamic significance of the Mesoproterozoic magmatism of the Udzha paleo-rift ( Northern Siberian craton) based in U-Pb geochronology and paleomagnetic data.Minerals ( mdpi.com), Vol. 8, 12, 11p. PdfRussia, Siberiacraton

Abstract: The emplacement age of the Great Udzha Dyke (northern Siberian Craton) was determined by the U-Pb dating of apatite using laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). This produced an age of 1386 ± 30 Ma. This dyke along with two other adjacent intrusions, which cross-cut the sedimentary units of the Udzha paleo-rift, were subjected to paleomagnetic investigation. The paleomagnetic poles for the Udzha paleo-rift intrusions are consistent with previous results published for the Chieress dyke in the Anabar shield of the Siberian Craton (1384 ± 2 Ma). Our results suggest that there was a period of intense volcanism in the northern Siberian Craton, as well as allow us to reconstruct the apparent migration of the Siberian Craton during the Mesoproterozoic.
DS201212-0459
2012
MEGMEGDiamond pipeline report 2012.Minerals Economics Group, Cost $ 450.00 USGlobalProduction
DS2002-0331
2002
Megartsi, M.Coulon, C., Megartsi, M., Fourcade, S., Maury, R.C., Bellon, H., Louni Hacini, A.Post collisional transition from calc-alkaline to alkaline volcanism during the Neogene inLithos, Vol.62,3-4,pp. 87-110.AlgeriaSubduction - slab
DS1997-0759
1997
Megnin, C.Megnin, C., Bunge, H.P., Richards, M.A.Imaging 3 D spherical convection models: what can seismic tomography tellus about mantle dynamics.Geophysical research Letters, Vol. 24, No. 11, June 1, pp. 1299-1302.MantleGeophysics - seismics, Tomography
DS1960-0578
1965
Megrue, G.H.Megrue, G.H., Kerr, P.F.Alteration of Sandstone Pipes Laguna New MexicoGeological Society of America (GSA) Bulletin., Vol. 76, PP. 1347-1360.United States, New Mexico, Colorado Plateau, Rocky MountainsDiatreme
DS1970-0971
1974
Meguid, F.O'hara, N.W., Meguid, F., Hinze, W.J.Gravity and Magnetic Observations from Lake Erie and Lake Ontario Region.Geological Society of America (GSA), Vol. 6, No. 7, P. 896, (abstract.).Michigan, OhioMid-continent
DS2003-0527
2003
Mehl, L.Hacker, B.R., Anderson, T.B., Root, D.B., Mehl, L., Mattinson, J.M., WoodenExhumation of high pressure rocks beneath the Solund Basin, Western gneiss regionJournal of Metamorphic Geology, Vol. 21, 6, pp. 613-30.NorwayUHP
DS200412-0758
2003
Mehl, L.Hacker, B.R., Anderson, T.B., Root, D.B., Mehl, L., Mattinson, J.M., Wooden, J.L.Exhumation of high pressure rocks beneath the Solund Basin, Western gneiss region, Norway.Journal of Metamorphic Geology, Vol. 21, 6, pp. 613-30.Europe, NorwayUHP
DS1984-0144
1984
Mehnert, H.Basu, A.R., Rubury, E., Mehnert, H., Tatsumoto, M.Sm Nd, Potassium-argon and Petrologic Study of Some Kimberlites from Eastern United States and Their Implications for Mantle Evolution.Contributions to Mineralogy and Petrology, Vol. 86, No. 1, PP. 35-44.South Africa, United States, China, Appalachia, Russia, India, Lesotho, New YorkGeochronology, Petrology
DS1990-1326
1990
Mehnert, H.H.Scott, G.R., Wilcox, R.E., Mehnert, H.H.Geology of volcanic and subvolcanic rocks of the Raton-Springer area, Colfax and Union Counties, New MexicoUnited States Geological Survey (USGS) Paper, No. 1507, 58pNew MexicoBrief mention -kimberlite in index terms, Alkaline rocks
DS1991-0667
1991
Mehnert, H.H.Harlan, S.S., Mehnert, H.H., Snee, L.W., Meen, J.K.Preliminary isotopic (K-Ar and 40Ar/38Ar) age determinations from selected Late Cretaceous and Tertiary igneous rocks in MontanaGuidebook of the Central Montana Alkalic Province, ed. Baker, D.W., Berg. R., No. 100, pp. 136. extended abstractMontanaGeochronology, Igneous rocks
DS201811-2579
2019
Mehramuz, M.Hamzeh, A., Mehramuz, M.The depth estimation of subsurface anomalies using probability tomography imaging method from airborne vertical gravity gradient. ( Not specific to diamonds).Journal of African Earth Sciences, Vol. 149, pp. 207-214.Globalgeophysics - gravity

Abstract: In this article, the probability tomography imaging method is applied to airborne vertical gravity gradient data to detect anomalies and estimate their depths and locations. First, the subsurface is divided into a 3D regular grid. Then, the probability tomography function is calculated at each grid node, and the obtained grid values are plotted. The zones of the highest values are the most probable areas for the buried bodies. It is noted that the results fall in the range [-1, +1] that represents the mass excess or mass deficit of density relative to the density of the host volume. The approach is applied to a sphere model and a cube model at certain flight altitudes. The results demonstrate that the approximate mass distribution and depth estimation derived from the approach are reliable up to a certain flight altitude.
DS2003-0220
2003
Mehta, K.Carswell, D.A., Brueckner, H.K., Cuthbert, S.J., Mehta, K., O'Brien, P.J.The timing of stabilization and the exhumation rate for ultra high pressure rocks in theJournal of Metamorphic Geology, Vol. 21, 6, pp. 601-612.NorwayUHP
DS200412-0286
2003
Mehta, K.Carswell, D.A., Brueckner, H.K., Cuthbert, S.J., Mehta, K., O'Brien, P.J.The timing of stabilization and the exhumation rate for ultra high pressure rocks in the Western Gneiss region of Norway.Journal of Metamorphic Geology, Vol. 21, 6, pp. 601-612.Europe, NorwayUHP
DS200512-1204
2004
Mei, H.J.Xiao, L., Xu, Y.G., Mei, H.J., Zheng, Y.F., He, B., Pirajno, F.Distinct mantle sources of low Ti and high Ti basalts from the western Emeishan large igneous province, SW China: implications for plume?? lithosphere interactionEarth and Planetary Science Letters, Vol. 228, 3-4, pp. 525-546.ChinaMantle mineralogy, titanium
DS200612-0814
2006
Mei, S.Li, L.,Weidner, D., Raterron, P., Chen, J., Vaughan, M., Mei, S., Durham, B.Deformation of olivine at mantle pressure using D-DIA.European Journal of Mineralogy, Vol. 18, 1, pp. 7-19.TechnologyExperimental petrology
DS201012-0491
2010
Mei, S.Mei, S., Suzuki, A.M., Kohlstadt, D.L., Dixon, N.A., Durham, W.B.Experimental constraints on the strength of the lithospheric mantle.Journal of Geophysical Research, Vol. 115, B8, B08204.MantleGeophysics - seismics
DS200412-0848
2004
Mei Fu, Z.Hong Fu, Z., Min, S.,Mei Fu, Z., Wei Ming, F., Zin Hua, Z., Ming Guo, Z.Highly heterogeneous Late Mesozoic lithospheric mantle beneath the North Chin a Craton: evidence from Sr Nd Pb isotopic systematiGeological Magazine, Vol. 141, 1, pp. 55-62.ChinaGeochronology
DS200812-0737
2008
MEI OnlineMEI OnlineModular diamond prospecting plant supplied to Fenswood in Russia. Vharbarovsk and Vladivistok area.MEI Online, Jan. 25, 1p.RussiaNews item - Alrosa
DS200912-0492
2009
MEI OnlineMEI OnlineSADPMR launch diamond fingerprinting project. Study aimed at determining the origin of rough diamonds.MEI Online, Feb. 10, 1p.TechnologyNews item - SADPMR
DS1999-0070
1999
Meibom, A.Bird, J.M., Meibom, A., Frei, R.Osmium and lead isotopes of rare Os Ir Ru minerals: derivation from the core mantle boundary region?Earth and Planetary Science Letters, Vol. 170, No. 1-2, June 30, pp. 83-92.MantleGeochronology
DS2003-0156
2003
Meibom, A.Brenker, F.E., Meibom, A., Frei, R.On the formation of peridotite derived Os rich PGE alloysAmerican Mineralogist, Vol. 88, pp. 1731-40.MantleMagmatism - peridotites
DS2003-0930
2003
Meibom, A.Meibom, A., Anderson, D.L.The statistical upper mantle assemblageEarth and Planetary Science Letters, MantleBlank
DS2003-0931
2003
Meibom, A.Meibom, A., Anderson, D.L., Sleep, N.H., Frei, R., Chamberlain, C.P., HrenAre high 3 He/ 4 He ratios in oceanic basalts an indicator of deep mantle plumeEarth and Planetary Science Letters, Vol. 208, 3-4, pp. 197-204.MantleHelium, Melting
DS2003-0932
2003
Meibom, A.Meibom, A., Anderson, D.L., Sleep, N.H., Frei, R., hamberlain, C.P., Hren, M.T.Are high 3He 4He ratios in oceanic basalts an indicator of deep mantle plumeEarth and Planetary Science Letters, Vol. 208, 3-4, March 30, pp.197-204.MantleGeochronology
DS200412-0204
2003
Meibom, A.Brenker, F.E., Meibom, A., Frei, R.On the formation of peridotite derived Os rich PGE alloys.American Mineralogist, Vol. 88, pp. 1731-40.MantleMagmatism - peridotites
DS200412-0580
2004
Meibom, A.Frei, R., Polat, A., Meibom, A.The Hadean upper mantle conundrum: evidence for source depletion and enrichment from Sm-Nd Re-Os and Pb isotopic compositions inGeochimica et Cosmochimica Acta, Vol. 68, 7, April 1, pp. 1645-1660.Europe, GreenlandGeochronology, boninites
DS200412-1289
2003
Meibom, A.Meibom, A., Anderson, D.L.The statistical upper mantle assemblage.Earth and Planetary Science Letters, Vol. 217, pp. 213-219.MantleGeochemistry
DS200412-1290
2004
Meibom, A.Meibom, A., Anderson, D.L.The statistical upper mantle assemblage.Earth and Planetary Science Letters, Vol. 217, 1, Jan. 1, pp. 123-139.MantleGeochemistry, Stratigraphy, MORB, SUMA
DS200412-1291
2004
Meibom, A.Meibom, A., Anderson, D.L.The statistical upper mantle assemblage.Geochimica et Cosmochimica Acta, 13th Goldschmidt Conference held Copenhagen Denmark, Vol. 68, 11 Supp. July, ABSTRACT p.A551MantleGeochemistry
DS200412-1292
2003
Meibom, A.Meibom, A., Anderson, D.L., Sleep, N.H., Frei, R., hamberlain, C.P., Hren, M.T., Wooden, J.L.Are high 3He 4He ratios in oceanic basalts an indicator of deep mantle plume components?Earth and Planetary Science Letters, Vol. 208, 3-4, March 30, pp.197-204.MantleGeochronology
DS200512-0715
2005
Meibom, A.Meibom, A., Sleep, N.H., Zahnle, K., Anderson, D.L.Models for noble gases in mantle geochemistry: some observations and alternatives.Plates, Plumes, and Paradigms, pp. 347-364. ( total book 861p. $ 144.00)MantleGeochemistry
DS201212-0831
2010
Meidong, S.Zhonghua, S., Taijin, L., Meidong, S.Coated and fracture filled coloured diamond.The Australian Gemmologist, Vol. 24, 2, Apr-June pp.TechnologyDiamond - morphology
DS201212-0832
2011
Meidong, S.Zhonghua, S., Taijin, L., Meidong, S., Jun, S., Jingjing, S.High quality synthetic yellow orange diamond emerges in China.The Australian Gemmologist, Vol. 24, 7, July-Sept pp.TechnologySynthetics
DS201511-1894
2014
Meidong, S.Zhonghua, S., Taijin, L., Meidong, S., Jun, S., Jing, D., Xikuan, Z.Coated and fracture filled coloured diamond.Australian Gemmologist, Vol. 24, 2, pp. 41-43.TechnologyDiamond morphology
DS201511-1895
2014
Meidong, S.Zhonghua, S., Taijin, L., Meidong, S., Jun, S., Jingjing, S.High quality synthetic yellow orange diamond emerges in China.Australian Gemmologist, Vol. 24, 7, pp. 167-170.ChinaSynthetics
DS1992-1044
1992
Meier, M.Meier, M.Arkansaw travellerLapidary Journal, April pp. 143-149.ArkansasLayman -Mineral collecting, Magnet Cove
DS1998-1519
1998
Meier, M.Vance, D., Meier, M., Oberli, F.The influence of high uranium-thorium (U-Th) inclusions on the uranium-thorium-lead systematics of almandine pyrope garnet: resultsGeochimica et Cosmochimica Acta, Vol. 62, No. 21-22, pp. 3527-40.IndiaGarnet mineralogy - not specific to diamonds
DS200412-1380
2004
Meier, M.Muntener, O., Pettke, T., Desmurs, L., Meier, M., Schaltegger, U.Refertilization of mantle peridotite in embryonic ocean basins: trace element and Nd isotopic evidence and implications to crustEarth and Planetary Science Letters, Vol. 221, 1-4, pp. 293-308.MantleGeochronology, melt
DS201112-0062
2011
Meier, T.Bartzsch, S., Lebedev, S., Meier, T.Resolving the lithosphere-asthenosphere boundary with seismic Rayleigh waves.Geophysical Journal International, In press,MantleGeophysics - seismics
DS201312-0529
2013
Meier, T.Lebedev, S., Adam, J.M-C., Meier, T.Mapping the Moho with seismic surface waves: a review, resolution analysis and recommended inversion strategies.Tectonophysics, Vol. 609, pp. 377-394.MantleMohorovic discontinuity
DS1994-1994
1994
Mei-FuZhou, Mei-Fuplatinum group elements (PGE) distribution in 2.7 Ga layered komatiite flows from the Belingwe greenstone belt, ZimbabweChemical Geology, Vol. 118, pp. 155-172ZimbabweGreenstone belt, Platinum, platinum group elements (PGE)
DS1992-1045
1992
Mei-Fu ZhouMei-Fu Zhou, Kerrich, R.Morphology and composition of chromite in komatiites from the Belingwe greenstone belt, ZimbabweCanadian Mineralogist, Vol. 30, No. 2, June pp. 303-318ZimbabweKomatiites, Belingwe greenstone belt
DS1993-1708
1993
Mei-Fu ZhouWen-Ji Bai, Mei-Fu Zhou, Robinson, P.T.Possible diamond bearing mantle peridotites and podiform chromitites in the Luobusa and Donqiao ophiolites, Tibet.Canadian Journal of Earth Sciences, Vol. 30, No. 8, August pp. 1650-1659.TibetDiamond bearing, Peridotites, ophiolites
DS1999-0235
1999
Meighan, I.G.Gamble, J.A., Wysoczanski, R.J., Meighan, I.G.Constraints on the age of the British Tertiary Volcanic Province from ion microprobe uranium-lead (U-Pb) SHRIMP ages...Journal of Geological Society of London, Vol. 156, No. 2, Mar. pp. 291-300.IrelandGeochronology - acid igneous rocks
DS200712-1189
2007
Meihua, C.Xiaoying, G., Meihua, C.Garnets from diamond deposits in Chin a and the Arkangelsk Diamondiferous province.Moscow University Geology Bulletin, Vol. 62, 5, pp. 342-346.China, Russia, Kola PeninsulaMineralogy - garnets
DS2000-0290
2000
Meihuam C.Fengxiang, L., Ying, W., Meihuam C., Jianping, Z.Geochemical characteristics and emplacement ages of the Mengyin kimberlites,Shandong Province.Snyder, Neal, Ernst, Plan. Petrology and Geochemistry, pp. 74-82.China, ShandongGeochemistry, Deposit - Mengyin
DS201911-2552
2019
Meijde, M.Ortiz, K., Nyblade, A., Meijde, M., Paulssen, H., Kwadiba, M., Ntibinyane, O., Durheim, R., Fadel, I., Homman, K.Upper mantle P and S wave velocity structure of the Kalahari craton and surrounding Proterozoic terranes, southern Africa.Geophysical Research Letters, Vol. 46, 16, pp. 9509-9518.Africa, South Africageophysics - seismics

Abstract: P and S waves travel times from large, distant earthquakes recorded on seismic stations in Botswana and South Africa have been combined with existing data from the region to construct velocity models of the upper mantle beneath southern Africa. The models show a region of higher velocities beneath the Rehoboth Province and parts of the northern Okwa Terrane and the Magondi Belt, which can be attributed to thicker cratonic lithosphere, and a region of lower velocities beneath the Damara-Ghanzi-Chobe Belt and Okavango Rift, which can be attributed a region of thinner off-craton lithosphere. This finding suggests that the spatial extent of thick cratonic lithosphere in southern Africa is greater than previously known. In addition, within the cratonic lithosphere an area of lower velocities is imaged, revealing parts of the cratonic lithosphere that may have been modified by younger magmatic events.
DS1994-1164
1994
MeijerMeijer, de, R.J., Tanczos, I.C., Stapel, C.Radiometric techniques in heavy mineral exploration and exploitationExploration and Mining Geology, Vol. 3, No. 4, Oct. pp. 389-98GlobalHeavy sands, Radiometric mapping
DS1990-1028
1990
Meijer, A.Meijer, A., Kwon, T.T., Tilton, G.R.U-Th-lead partioning behaviour during partial melting in the upper mantle-implications for the origin of high Mu-components and the lead paradoxJournal of Geophysical Research, Vol. 95, No. 1, Jan. 10, pp. 433-448GlobalMantle, lead paradox
DS1997-0760
1997
Meijer, P.Th.Meijer, P.Th., Govers, R., Wortel, M.J.R.Forces controlling the present day state of stress in the AndesEarth and Planetary Science Letters, Vol. 148, No. 1-2, Apr. 1, pp. 157-AndesTectonics
DS1992-1046
1992
Meijer Drees, N.C.Meijer Drees, N.C.The Devonian succession in the Subsurface of the Great Slave and Great BearPlains, Northwest Territories.Geological Survey Canada Bulletin, No. 393, 222p. $ 34.15Northwest TerritoriesRegional geology
DS201012-0233
2010
Meilick, F.I.Gerya, T.V., Meilick, F.I.Geodynamic regimes of subduction under an active margin: effects of rheological weakening by fluids and melts.Journal of Metamorphic Geology, In press available,MantleSubduction
DS201112-0362
2011
Meilick, F.I.Gerya, T.V., Meilick, F.I.Geodynamic regimes of subduction under an active margin: effects of rheological weakening of fluids and melts.Journal of Metamorphic Geology, Vol. 29, 1, pp. 7-31.MantleMelting
DS1991-1117
1991
Meilunas, R.Meilunas, R., Chang, R.P.H., Shengzhong Liu, Kappes, M.M.Activated C 70 and diamondNature, Vol. 354, No. 6351, November 28, p. 271GlobalGeochemistry, Carbon
DS2002-1043
2002
Meiner, B.Meiner, B., Detersm P., Strikantappa, C., Kohler, H.Geochronological evolution of the Moyar, Bhavani, Palghat shear zones: implications for east Gondwana..Precambrian Research, Vol. 114, No. 1-2, pp. 149-75.India, southernGeochronology, Gondwana - correlations
DS201012-0492
2010
Meinheld, G.Meinheld, G.Rutile and its applications in earth science.Earth Science Reviews, Vol. 102, 2, pp. 1-28.TechnologyReview - rutile
DS201412-0481
2014
Meinhold, G.Krippner, A., Meinhold, G., Morton, A.C., Von Eynatten, H.Evaluation of garnet discrimination diagrams using geochemical dat a of garnets from various host rocks.Sedimentology, Vol. 306, pp. 36-42.Europe, Austria, NorwayMineral chemistry - garnets
DS201804-0720
2018
Meinhold, G.Meinhold, G., Celal Sengor, A.M.A historical account of how continental drift and plate tectonics provided the framework for our current understanding of paleogeography.Geological Magazine, Mar. 19, 26p. PdfMantleplate tectonics

Abstract: Palaeogeography is the cartographic representation of the past distribution of geographic features such as deep oceans, shallow seas, lowlands, rivers, lakes and mountain belts on palinspastically restored plate tectonic base maps. It is closely connected with plate tectonics which grew from an earlier theory of continental drift and is largely responsible for creating and structuring the Earth's lithosphere. Today, palaeogeography is an integral part of the Earth sciences curriculum. Commonly, with some exceptions, only the most recent state of research is presented; the historical aspects of how we actually came to the insights which we take for granted are rarely discussed, if at all. It is remarkable how much was already known about the changing face of the Earth more than three centuries before the theory of plate tectonics, despite the fact that most of our present analytical tools or our models were unavailable then. Here, we aim to present a general conspectus from the dawn of ‘palaeogeography’ in the 16th century onwards. Special emphasis is given to innovative ideas and scientific milestones, supplemented by memorable anecdotes, which helped to advance the theories of continental drift and plate tectonics, and finally led to the establishment of palaeogeography as a recognized discipline of the Earth sciences.
DS201812-2892
2018
Meinhold, G.Tolosana-Delgado, R., von Eynatten, H., Krippner, A., Meinhold, G.A multivariate discrimination scheme of detrital garnet chemistry for use in sedimentary provenance analysis.Sedimentary Geology, Vol. 375, pp. 14-26.Europe, Norway, Austria, Africa, Ugandamineral chemistry

Abstract: Garnet chemistry provides a well-established tool in the discrimination and interpretation of sediment provenance. Current discrimination approaches, however, (i) suffer from using less variables than available, (ii) subjective determination of discrimination fields with strict boundaries suggesting clear separations where in fact probabilities are converging, and (iii) significant overlap of compositional fields of garnet from different host-rock groups. The new multivariate discrimination scheme is based on a large database, a hierarchical discrimination approach involving three steps, linear discriminant analysis at each step, and the five major host-rock groups to be discriminated: eclogite- (A), amphibolite- (B) and granulite- (C) facies metamorphic rocks as well as ultramafic (D) and igneous rocks (E). The successful application of statistical discrimination approaches requires consideration of the a priori knowledge of the respective geologic setting. This is accounted for by the use of prior probabilities. Three sets of prior probabilities (priors) are introduced and their advantages and disadvantages are discussed. The user is free to choose among these priors, which can be further modified according to the specific geologic problem and the level of a priori knowledge. The discrimination results are provided as integrated probabilities of belonging to the five major host-rock groups. For performing calculations and results a supplementary Excel® spreadsheet is provided. The discrimination scheme has been tested for a large variety of examples of crystalline rocks covering all of the five major groups and several subgroups from various geologic settings. In most cases, garnets are assigned correctly to the respective group. Exceptions typically reflect the peculiarities of the regional geologic situation. Evaluation of detrital garnets from modern and ancient sedimentary settings of the Western Gneiss Region (Norway), Eastern Alps (Austria) and Albertine Rift (Uganda) demonstrates the power to reflect the respective geologic situations and corroborates previous results. As most garnet is derived from metamorphic rocks and many provenance studies aim at reconstructing the tectonic and geodynamic evolution in the source area, the approach and the examples emphasize discrimination of metamorphic facies (i.e., temperature-pressure conditions) rather than protolith composition.
DS201902-0299
2019
Meinhold, G.Meinhold, G., Celal Sengor, A.M.A historical account of how continental drift and plate tectonics provided the framework for our current understanding of palaeogeography.Geological Magazine, Vol. 156, 2, pp. 182-207.Mantleplate tectonics

Abstract: Palaeogeography is the cartographic representation of the past distribution of geographic features such as deep oceans, shallow seas, lowlands, rivers, lakes and mountain belts on palinspastically restored plate tectonic base maps. It is closely connected with plate tectonics which grew from an earlier theory of continental drift and is largely responsible for creating and structuring the Earth's lithosphere. Today, palaeogeography is an integral part of the Earth sciences curriculum. Commonly, with some exceptions, only the most recent state of research is presented; the historical aspects of how we actually came to the insights which we take for granted are rarely discussed, if at all. It is remarkable how much was already known about the changing face of the Earth more than three centuries before the theory of plate tectonics, despite the fact that most of our present analytical tools or our models were unavailable then. Here, we aim to present a general conspectus from the dawn of ‘palaeogeography’ in the 16th century onwards. Special emphasis is given to innovative ideas and scientific milestones, supplemented by memorable anecdotes, which helped to advance the theories of continental drift and plate tectonics, and finally led to the establishment of palaeogeography as a recognized discipline of the Earth sciences.
DS201909-2082
2019
Meinhold, G.Schonig, J., von Eynatten, H., Meinhold, G., Lunsdorf, N.K.Diamond and coesite inclusions in detrital garnet of the Saxonian Erzgebirge, Germany.Geology, Vol. 47, 8, pp. 715-718.Europe, GermanyUHP

Abstract: Local occurrences of coesite- and diamond-bearing rocks in the central Erzgebirge (northwestern Bohemian Massif, Germany) reveal ultrahigh-pressure (UHP) metamorphic conditions during the Variscan orogeny. Although UHP metamorphism supposedly affected a wider area, implying that rocks that equilibrated under UHP conditions occur dispersed in large volumes of high-pressure country-rock gneisses, mineralogical evidence is scarce. Here we have applied the new concept of capturing the distribution and characteristics of UHP rocks by analyzing inclusions in detrital garnet. Out of 700 inclusion-bearing garnets from seven modern sand samples from creeks draining the UHP area around the Saidenbach reservoir, we detected 26 garnets containing 46 mainly monomineralic coesite inclusions and 22 garnets containing 41 diamond inclusions. Combining these results with geochemical classification of the host garnets, we show (1) that coesite-bearing rocks are common and comprise eclogites as well as felsic gneisses, (2) that small inclusion size is a necessary precondition for the preservation of monomineralic coesite, and (3) for the first time, that diamond-bearing crustal rocks can be detected by analyzing the detrital record. Our results highlight the potential of this novel application of sedimentary provenance tools to UHP research, and the necessity of looking at the micrometer scale to find evidence in the form of preserved UHP minerals.
DS1988-0155
1988
Meirelles, M.R.Dardenne, M.A., Ferreira Filho, C.F., Meirelles, M.R.The role of shoshonitic and calc-alkaline suites in the tectonic Evolution of the Carajas District, BrasilJournal of South American Earth Sciences, Vol. 1, No. 4, pp. 363-372BrazilShoshonite
DS2001-0768
2001
Meisel, T.Meisel, T., Walker, R.J., Lorand, J-P.Osmium isotopic compositions of mantle xenoliths: a global perspectiveGeochimica et Cosmochimica Acta, Vol. 65, No. 8, Apr. 1311-24.MantleGeochronology, Xenoliths
DS2002-0429
2002
Meisel, T.Engler, A., Koller, F., Meisel, T., Quemeneur, J.Evolution of the Archean/Proterozoic crust in the southern Sao Francisco Craton nearJournal of South American Earth Sciences, Vol. 15, No. 6, pp. 709-23.Brazil, Minas GeraisTectonics - not specific to diamonds
DS2003-0933
2003
Meisel, T.Meisel, T., Reisberg, L., Moser, J., Carignan, J., Melcher, F., Brugmann, G.Re Os systematics of UB N, a serpentinized peridotite reference materialChemical Geology, Vol. 201, 3-4, Nov. 14, pp.161-179.FranceGeochronology, metamorphosed lherzolite
DS200412-1293
2003
Meisel, T.Meisel, T., Reisberg, L., Moser, J., Carignan, J., Melcher, F., Brugmann, G.Re Os systematics of UB N, a serpentinized peridotite reference material.Chemical Geology, Vol. 201, 3-4, Nov. 14, pp.161-179.Europe, FranceGeochronology, metamorphosed lherzolite
DS1999-0462
1999
Meisl, J.G.McKenzie, W.C., Meisl, J.G., Russenholt, W.C., StockiChallenges of construction in the Arctic: the Ekati diamond mineMining in the Arctic, Udd and Keen editors, Balkema, pp. 79-84.Northwest TerritoriesMining - construction, Deposit - Ekati
DS1920-0456
1929
MeisnerMeisnerPlatin, Chrom, Vanadium, Asbest, und DiamantenZeitschr. F. Prak. Geol., Vol. 36, PP. 73-74.South AfricaPlatinum, Chrome, Asbestos, Diamond
DS2002-1044
2002
Meissener, R.Meissener, R., Mooney, W.D., Artemieva, I.Seismic anisotropy and mantle creep in young orogensGeophysical Journal International, Vol.149,1,pp.1-14., Vol.149,1,pp.1-14.MantleGeophysics - seismics, Tectonics - orogeny
DS2002-1045
2002
Meissener, R.Meissener, R., Mooney, W.D., Artemieva, I.Seismic anisotropy and mantle creep in young orogensGeophysical Journal International, Vol.149,1,pp.1-14., Vol.149,1,pp.1-14.MantleGeophysics - seismics, Tectonics - orogeny
DS1970-0142
1970
Meissner, F.F.Meissner, F.F.Petroleum geology of the Bakken Formation, Williston Basin, North Dakota and Montana.Unknown, pp. 207-218.Montana, North DakotaWilliston Basin - Structure
DS1991-1118
1991
Meissner, R.Meissner, R., Brown, L.Seismic reflections from the earth's crust- comparative studies of tectonicpatternsGeophysical Journal International, Vol. 105, No. 1, April pp. 1-2GlobalGeophysics -seismics, Tectonics -crust
DS1991-1119
1991
Meissner, R.Meissner, R., Mooney, W.D.Speculations on continental crustal evolutionEos Transactions, Vol. 72, No. 52, December 24, pp. 585.590MantleCrust, Tectonics
DS1991-1120
1991
Meissner, R.Meissner, R., Wever, Th., Sadowiak, P.Continental collisions and seismic signatureGeophysical Journal International, Vol. 105, No. 1, April pp. 15-24United StatesGeophysics -seismics, Tectonics -crust
DS1991-1184
1991
Meissner, R.Mooney, W.D., Meissner, R.Continental crustal evolution observationsEos Transactions, Vol. 72, No. 48, November 26, pp. 537, 540, 541MantleCrustal evolution, Tectonics
DS1992-1047
1992
Meissner, R.Meissner, R., Wever, ThThe possible role of fluids for the structuring of the continental crustEarth Science Reviews, Vol. 32, pp. 19-32GlobalCrust, Geophysics -seismics
DS1996-1399
1996
Meissner, R.Tanner, B., Meissner, R.Caledonian deformation upon southwest Baltica and its tectonicimplications: alternatives and consequences.Tectonics, Vol. 15, No. 4, Aug. pp. 803-12.Baltic States, GermanyLineaments, tectonics
DS1998-0988
1998
Meissner, R.Meissner, R., Mooney, W.Weakness of the lower continental crust: a condition for delamination, uplift and escape.Tectonophysics, Vol. 296, No. 1-2, . Oct. 30, pp. 47-60.MantleTectonics, Magmatism
DS200612-0903
2006
Meissner, R.Meissner, R., Rabbel, W., Kern, H.Seismic lamination and anisotropy of the Lower Continental Crust.Tectonophysics, Vol. 416, 1-4, April 5, pp. 81-99.MantleGeophysics - seismics
DS200612-0904
2006
Meissner, R.Meissner, R., Rabbel, W., Kern, H.Seismic lamination and anisotropy of the Lower Continental Crust.Tectonophysics, in pressMantle, Europe, GermanyGeophysics - seismics, crust mantle boundary
DS201511-1863
2015
Meissner, R.Meissner, R., Ramasar, V.Governance and politics in the upper Limpopo River basin, South Africa.Geojournal, Vol. 80, 5, pp. 689-709.Africa, South AfricaMentions Venetia

Abstract: Everyday international political economy (EIPE) offers an opportunity to rethink the role of individuals and citizenry in shaping governance of natural resources. In South Africa, significant progress has been made by government in re-shaping water governance since the end of apartheid in the early 1990s. The role of government in water governance and water politics has thus been emphasised to a large degree. This study looks at historical material to assess the role that water politics and EIPE has played in shaping the use and management of water resources in the country. Case studies are analysed of two quaternary catchments, A63E and A71L in the Limpopo River Basin, to show how everyday actions by different actors has shaped the current waterscape in the basin. Four events, namely, the politics of the Middle Iron Age State at Mapungubwe; the development of the Mapungubwe National Park and World Heritage Site; the management of water for the De Beers Venetia Diamond Mine; and the establishment of the Coal of Africa Limited colliery are discussed in terms of the agential power at play during each event. The conclusions of the study are that EIPE and reflexive agential power are important factors in water governance that can sometimes be ignored through neoliberal institutionalism. In the current and future governance of water in South Africa they can offer an alternative view of the role and importance of actors and pathways for development.
DS1990-1411
1990
Meissner, R.O.Stegena, L.G., Meissner, R.O.Heat production and seismic velocity of crustal rocksTerra Nova, Vol. 2, No. 1, pp. 87-90OntarioTectonics, Kapuskasing Uplift, Craton
DS1998-0549
1998
Meixner, A.J.Gunn, P.J., Meixner, A.J.The nature of the basement to the Kimberley block, north-westernAustralia.Australian Society of Exploration Geophysicists (ASEG) International, p. 117. abstractAustraliaGeophysics - aeromagnetics, Kimberley Block
DS1995-1228
1995
Meju, M.A.Meju, M.A.Geophysical models in natural resources explorationChapman Hall, 320pGlobalBase metal, placers, Book -ad
DS1998-0989
1998
Meju, M.A.Meju, M.A.A simple method of transient electromagnetic dat a analysisGeophysics, Vol. 63, No. 2, Mar-Apr, pp. 405-10GlobalGeophysics - TEM.
DS200712-0710
2007
Meju, M.A.Meju, M.A., Sakkas, V.Heterogeneous crust and upper mantle across southern Kenya and the relationship to surface deformation as inferred from magnetotelluric imaging.Journal of Geophysical Research, Vol. 112, B4, B04103.Africa, KenyaGeophysics
DS201112-0342
2011
Meju, M.A.Gallardo, L.A., Meju, M.A.Structure coupled multiphysics imaging in geophysical sciences.Reviews of Geophysics, Vol. 49, 1, RG1003TechnologyGeophysics - not specific to diamonds
DS1983-0445
1983
Mekhonoshin, A.S.Mekhonoshin, A.S., Glazunova, A.D., Frolova, L.P., Klopotov, V.Geochemical Features of Ilmenite of Basic and Ultrabasic Rocks.Soviet Geology And Geophysics, Vol. 24, No. 4, PP. 55-60.RussiaGeochemistry
DS1995-1714
1995
Mekhonoshin, A.S.Sharkov, E.V., Bongina, M.M., Mekhonoshin, A.S.Tectonic blocks of the Precambrian lower crust and upper mantle, southern Sayan Mountains, East Siberia.International Geology Review, Vol. 37, No. 1, Jan. pp. 81-91.Russia, SiberiaTectonics, Sayan Mountains
DS2000-0577
2000
Mekhonoshin, A.S.Litasov, K.D., Mekhonoshin, A.S.Zinc in spinels of peridotite xenoliths from Pliocene basanites of the Vitim volcanic field.Geochemistry International, Vol. 38, No. 8, pp. 738-43.RussiaBasanites, peridotites, Geochemistry
DS2000-0578
2000
Mekhonoshin, A.S.Litasov, K.D., Mekhonoshin, A.S., Malkovets, V.G.Mineralogy of mantle xenoliths from Pliocene basanites of Dzhilinda River.Vitim volcanic field.Russian Geology and Geophysics, Vol.41,11,pp.1477-1501., Vol.41,11,pp.1477-1501.RussiaXenoliths, Basanites
DS2000-0579
2000
Mekhonoshin, A.S.Litasov, K.D., Mekhonoshin, A.S., Malkovets, V.G.Mineralogy of mantle xenoliths from Pliocene basanites of Dzhilinda River.Vitim volcanic field.Russian Geology and Geophysics, Vol.41,11,pp.1477-1501., Vol.41,11,pp.1477-1501.RussiaXenoliths, Basanites
DS2000-0580
2000
Mekhonoshin, A.S.Litasov, K.D., Mekhonoshin, A.S., Malkovets, V.G.Geochemistry of clinopyroxenes and petrogenesis of mantle xenoliths from Pliocene basanites.. Vitim field.Russian Geology and Geophysics, Vol.41,11,pp.1502-19., Vol.41,11,pp.1502-19.RussiaXenoliths, Geochemistry
DS2000-0581
2000
Mekhonoshin, A.S.Litasov, K.D., Mekhonoshin, A.S., Malkovets, V.G.Geochemistry of clinopyroxenes and petrogenesis of mantle xenoliths from Pliocene basanites.. Vitim field.Russian Geology and Geophysics, Vol.41,11,pp.1502-19., Vol.41,11,pp.1502-19.RussiaXenoliths, Geochemistry
DS201607-1295
2016
Mekhonoshin, A.S.Ernst, R.E., Hamilton, M.A., Soderlund, U., Hanes, J.A., Gladkochub, D.P., Okrugin, A.V., Kolotilina, T., Mekhonoshin, A.S., Bleeker, W., LeCheminant, A.N., Buchan, K.L., Chamberlain, K.R., Didenko, A.N.Long lived connection between southern Siberia and northern Laurentia in the Proterozoic.Nature Geoscience, Vol. 9, 6, pp. 464-469.Canada, RussiaProterozoic

Abstract: Precambrian supercontinents Nuna-Columbia (1.7 to 1.3 billion years ago) and Rodinia (1.1 to 0.7 billion years ago) have been proposed. However, the arrangements of crustal blocks within these supercontinents are poorly known. Huge, dominantly basaltic magmatic outpourings and intrusions, covering up to millions of square kilometres, termed Large Igneous Provinces, typically accompany (super) continent breakup, or attempted breakup and offer an important tool for reconstructing supercontinents. Here we focus on the Large Igneous Province record for Siberia and Laurentia, whose relative position in Nuna-Columbia and Rodinia reconstructions is highly controversial. We present precise geochronology—nine U -Pb and six Ar -Ar ages—on dolerite dykes and sills, along with existing dates from the literature, that constrain the timing of emplacement of Large Igneous Province magmatism in southern Siberia and northern Laurentia between 1,900 and 720 million years ago. We identify four robust age matches between the continents 1,870, 1,750, 1,350 and 720 million years ago, as well as several additional approximate age correlations that indicate southern Siberia and northern Laurentia were probably near neighbours for this 1.2-billion-year interval. Our reconstructions provide a framework for evaluating the shared geological, tectonic and metallogenic histories of these continental blocks.
DS201502-0111
2015
Melanholina, E.Sushchevskaya, N., Melanholina, E., Belyatsky, B., Krymsky, R., Migdisova, N.Oceanic magmatic evolution during ocean opening under influence of mantle plume.Economic Geology Research Institute 2015, Vol. 17,, #3059, 1p. AbstractIndiaLamproite
DS1995-1229
1995
Melbourne, T.Melbourne, T.Evidence for a diffuse 410 km discontinuityEos, Vol. 76, No. 46, Nov. 7. p.F383. Abstract.MantleGeophysics -seismic, Discontinuity
DS1998-0990
1998
Melbourne, T.Melbourne, T., Helmburger, D.Fine structure of the 410 Km discontinuityJournal of Geophysical Research, Vol. 103, No. 5, May 10, pp. 10091-103.MantleTectonics, Boundary - discontinuity
DS2001-0769
2001
Melbourne, T.Melbourne, T., Helmberger, D.Mantle control of plate boundary deformationGeophysical Research Letters, Vol. 28, No. 20, Oct. 15, pp. 4003-6.MantleTectonics, Core mantle boundary
DS201901-0050
2018
Melchakova, L.V.Ogorodova, L.P., Gritsenko, Y.D., Vigasina, M.F., Bychkov, A.Y., Ksenofontov, D.A., Melchakova, L.V.Thermodynamic properties of natural melilites.American Mineralogist, Vol. 103, pp. 1945-1952.Mantlemineralogy

Abstract: In the present study, four samples of natural melilites were characterized using electron microprobe analysis, powder X-ray diffraction, FTIR, and Raman spectroscopy, and their thermodynamic properties were measured with a high-temperature heat-flux Tian-Calvet microcalorimeter. The enthalpies of formation from the elements were determined to be: -3796.3 ± 4.1 kJ/mol for Ca1.8Na0.2(Mg0.7Al0.2Fe2+0.1?)Si2O7, -3753.6 ± 5.2 kJ/mol for Ca1.6Na0.4(Mg0.5Al0.4Fe2+0.1?)Si2O7, -3736.4 ± 3.7 kJ/mol for Ca1.6Na0.4(Mg0.4Al0.4Fe2+0.2?)Si2O7, and -3929.2 ± 3.8 kJ/mol for Ca2(Mg0.4Al0.6)[Si1.4Al0.6O7]. Using the obtained formation enthalpies and estimated entropies, the standard Gibbs free energies of formation of these melilites were calculated. Finally, the enthalpies of the formation of the end-members of the isomorphic åkermanite-gehlenite and åkermanite-alumoåkermanite series were derived. The obtained thermodynamic properties of melilites of different compositions can be used for quantitative modeling of formation conditions of these minerals in related geological and industrial processes.
DS2003-0933
2003
Melcher, F.Meisel, T., Reisberg, L., Moser, J., Carignan, J., Melcher, F., Brugmann, G.Re Os systematics of UB N, a serpentinized peridotite reference materialChemical Geology, Vol. 201, 3-4, Nov. 14, pp.161-179.FranceGeochronology, metamorphosed lherzolite
DS200412-1293
2003
Melcher, F.Meisel, T., Reisberg, L., Moser, J., Carignan, J., Melcher, F., Brugmann, G.Re Os systematics of UB N, a serpentinized peridotite reference material.Chemical Geology, Vol. 201, 3-4, Nov. 14, pp.161-179.Europe, FranceGeochronology, metamorphosed lherzolite
DS201412-0575
2014
Melcher, F.Midende, G., Boulais, P., Tack, L., Melcher, F., Gerdes,A., Dewaele, S., Demaiffe, D., Decree, S.Petrography, geochemistry and U Pb zircon age of the Matongo carbonatite Massif ( Burundi): implication for the Neoproterozoic geodynamic evolution of Central Africa.Journal of African Earth Sciences, Vol. 100, pp. 656-674.Africa, BurundiCarbonatite
DS201502-0078
2014
Melcher, F.Midende, G., Boulvais, P., Tack, L., Melcher, F., Gerdes, A., Dewaele, S., Demaiffe, D., Decree, S.Petrography, geochemistry and U-Pb zircon age of the Matongo carbonatite Massif ( Burundi): implication for the Neoproterozoic geodynamic evolution of Central Africa.Journal of African Earth Sciences, Vol. 100, pp. 656-674.Africa, BurundiCarbonatite
DS201312-0144
2013
Meldrum, P.I.Chambers, J.E., Wilkinson, P.B., Wrdrop, D., Hameed, A., Hill, I., Jeffrey, C., Loke, M.H., Meldrum, P.I., Kuras, O., Cave, M., Gunn, D.A.Bedrock detection beneath river terrace deposits using three dimensional electrical resistivity tomography.Geomorphology, Vol. 177-178, pp. 17-25.GlobalGeochronology
DS201705-0806
2017
Mele, D.Agrosi, G., Tempesta, G., Mele, D., Allegretta, I., Teranzo, R., Nestola, F.Multi analytical approach for non-destructuve analyses of a diamond from Udachnaya and its trapped inclusions: the first report of (fe, Ni) 1+xS machinawite sulphide in diamonds.European Geosciences Union General Assembly 2017, Vienna April 23-28, 1p. 5374 AbstractRussiaDeposit - Udachnaya

Abstract: The study of diamonds and the mineral inclusions trapped in them is of great interest for Earth science, since they can provide insight about deep mantle conditions and its evolution. The conventional techniques commonly used are destructive and thus do not allow the employment of different methods used simultaneously to obtain integrated and complementary results. Significant information about the growth conditions of diamonds and their inclusions still trapped within them can be preferably obtained by in situ investigation. In this study, we propose a multi-analytical approach, using a set of non-destructive techniques with conventional sources, to investigate one diamond from Udachnaya kimberlite (Siberia, Russia). The combined use of micro-X-ray Tomography, micro-X-ray Fluorescence, X-Ray Powder Diffraction and micro-Raman spectroscopy, allowed us to determine the spatial distribution of the inclusions, their chemical and mineralogical composition and, finally, the paragenetic suite, totally preserving the diamond host. The sample was also studied by means of X-ray Diffraction Topography to characterize the structural defects and to obtain genetic information about the growth history of the diamond. The combination of the different data provided a sort of «mapping» of a diamond. The X-Ray Topographic images show that the sample investigated exhibits plastic deformation. Actually, one set of {111} slip lamellae, corresponding to polysynthetic twinning, affect the whole sample. The tomographic images reveal that the primary inclusions, not observable optically, show a poly-faceted shape corresponding to an assemblage of tiny crystals. The chemical data display that the trapped minerals are mono-sulphides of Fe, Ni. The diagrams obtained by the X-Ray diffraction reveal that the inclusions mainly consist of an assemblage of tiny crystals of pentlandite and pyrrothite. Nevertheless, a thorough analysis of the diffraction data suggests the presence of another mono-sulphide of Fe,Ni: mackinawite. Raman spectra taken on these inclusions confirm, for the first time, the presence of this metastable phase as inclusion in diamond. The genetic implications of these results are discussed.
DS201712-2668
2017
Mele, D.Agrosi, G., Tempesta, G., Mele, D., Allegretta, I., Terzano, R., Shirery, S.B., Pearson, G.D., Nestola, F.Non-destructive, multi-method, internal analysis of multiple inclusions in a single diamond: first occurrence of mackinawite ( Fe,Ni)1+xSAmerican Mineralogist, Vol. 102, pp. 2235-2243.Russia, Siberiadeposit - Udachnaya

Abstract: A single gem lithospheric diamond with five sulfide inclusions from the Udachnaya kimberlite (Siberia, Russia) has been analyzed non-destructively to track the growth conditions of the diamond. Sulfides are the most abundant mineral inclusions in many lithospheric diamond crystals and are the most favorable minerals to date diamond crystals by Re-Os isotope systematics. Our investigation used non-destructive, micro-techniques, combining X-ray tomography, X-ray fluorescence, X-ray powder diffraction, and Raman spectroscopy. This approach allowed us to determine the spatial distribution of the inclusions, their chemical and mineralogical composition on the microscale, and, finally, the paragenetic association, leaving the diamond host completely unaffected. The sample was also studied by X-ray diffraction topography to characterize the structural defects of the diamond and to obtain genetic information about its growth history. The X-ray topographic images show that the sample investigated exhibits plastic deformation. One set of {111} slip lamellae, corresponding to polysynthetic twinning, affects the entire sample. Chemical data on the inclusions still trapped within the diamond show they are monosulfide solid solutions of Fe, Ni and indicate a peridotitic paragenesis. Micro-X-ray diffraction reveals that the inclusions mainly consist of a polycrystalline aggregate of pentlandite and pyrrothite. A thorough analysis of the Raman data suggests the presence of a further Fe, Ni sulfide, never reported so far in diamonds: mackinawite. The total absence of any oxides in the sulfide assemblage clearly indicates that mackinawite is not simply a “late” alteration of pyrrhotite and pentlandite due to secondary oxidizing fluids entering diamond fractures after the diamond transport to the surface. Instead, it is likely formed as a low-temperature phase that grew in a closed system within the diamond host. It is possible that mackinawite is a more common phase in sulfide assemblages within diamond crystals than has previously been presumed, and that the percentage of mackinawite within a given sulfide assemblage could vary from diamond to diamond and from locality to locality.
DS201902-0304
2019
Mele, D.Nimis, P., Nestola, F., Schiazza, M., Reali, R., Agrosi, G., Mele, D., Tempesta, G., Howell, D., Hutchison, M.T., Spiess, R.Fe-rich ferropericlase and magnesiowustite inclusions reflecting diamond formation rather than ambient mantle.Geology, Vol. 47, 1., pp. 27-30.South America, Brazildeposit - Juina

Abstract: At the core of many Earth-scale processes is the question of what the deep mantle is made of. The only direct samples from such extreme depths are diamonds and their inclusions. It is commonly assumed that these inclusions reflect ambient mantle or are syngenetic with diamond, but these assumptions are rarely tested. We have studied inclusion-host growth relationships in two potentially superdeep diamonds from Juina (Brazil) containing nine inclusions of Fe-rich (XFe ˜0.33 to =0.64) ferropericlase-magnesiowüstite (FM) by X-ray diffractometry, X-ray tomography, cathodoluminescence, electron backscatter diffraction, and electron microprobe analysis. The inclusions share a common [112] zone axis with their diamonds and have their major crystallographic axes within 3°-8° of those of their hosts. This suggests a specific crystallographic orientation relationship (COR) resulting from interfacial energy minimization, disturbed by minor post-entrapment rotation around [112] due to plastic deformation. The observed COR and the relationships between inclusions and diamond growth zones imply that FM nucleated during the growth history of the diamond. Therefore, these inclusions may not provide direct information on the ambient mantle prior to diamond formation. Consequently, a “non-pyrolitic” composition of the lower mantle is not required to explain the occurrence of Fe-rich FM inclusions in diamonds. By identifying examples of mineral inclusions that reflect the local environment of diamond formation and not ambient mantle, we provide both a cautionary tale and a means to test diamond-inclusion time relationships for proper application of inclusion studies to whole-mantle questions.
DS201912-2766
2019
Mele, D.Agrosi, G., Tempesta, G., Mele, D., Caggiani, MC., Mangone, A., Della Ventura, G., Cestelli-Guidi, M., Allegretta, I., Hutchison, M.T., Nimis, P., Nestola, F.Multiphase inclusions associate with residual carbonate in a transition zone diamond from Juina, Brazil.Lithos, in press available, 31p. pdfSouth America, Brazildeposit - Juina

Abstract: Super-deep diamonds and their mineral inclusions preserve very precious information about Earth’s deep mantle. In this study, we examined multiphase inclusions entrapped within a diamond from the Rio Vinte e um de Abril, São Luiz area (Juina, Brazil), using a combination of non-destructive methods. Micro-Computed X-ray Tomography (µ-CXRT) was used to investigate the size, shape, distribution and X-Ray absorption of inclusions and mapping by micro X-ray Fluorescence (µ-XRF), µ-Raman Spectroscopy and micro-Fourier Transform Infrared Spectroscopy (µ-FTIR) were used to determine the chemical and mineralogical composition of the inclusions. Four large inclusions enclosed in the N-rich diamond core consist of dominant ferropericlase-magnesiowüstite and locally exsolved magnesioferrite. FTIR maps, obtained integrating the band at 1430 cm-1, show also the presence of carbonates. A fifth large inclusion (ca 100 µm) was remarkable because it showed a very unusual flask shape, resembling a fluid/melt inclusion. Based on µCXRT tomography and µ-Raman mapping, the flask-shaped inclusion is polyphase and consists of magnetite and hematite partly replacing a magnesiowüstite core and small-volume of gas/vacuum. µ-Raman spectra on the same inclusion revealed local features that are ascribed to post-spinel polymorphs, such as maohokite or xieite, which are stable at P = 18 GPa, and to huntite, a carbonate with formula CaMg3(CO3)4. This represents the first finding of maohokite and huntite in diamond. We interpret the composition of the inclusions as evidence of formation of ferropericlase-magnesiowüstite and diamond in a carbonate-rich environment at depths corresponding at least to the Transition Zone, followed by oxidation of ferropericlase-magnesiowüstite by reaction with relatively large-volume entrapped melt during diamond ascent.
DS200712-0711
2007
Melekhova, E.Melekhova, E., Schmidt, M.W., Ulmer, P., Pettke, T.The composition of liquids coexisting with Dense Hydrous Magnesium silicates and the second critical endpoint in the MgO SiO2 H2O system.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.184.TechnologyWater
DS200712-0712
2007
Melekhova, E.Melekhova, E., Schmidt, M.W., Ulmer, P., Pettke, T.The composition of liquids coexisting with Dense Hydrous Magnesium silicates and the second critical endpoint in the MgO SiO2 H2O system.Frontiers in Mineral Sciences 2007, Joint Meeting of Mineralogical societies Held June 26-28, Cambridge, Abstract Volume p.184.TechnologyWater
DS201510-1813
2015
Melekhova, E.Walter, M.J., Thomson, A.R., Wang, W., Lord, O.T., Ross, J., McMahon, S.C., Baron, M.A., Melekhova, E., Kleppe, A K., Kohn, S.C.The stability of hydrous silicates in Earth's lower mantle: experimental constraints from the systems MgO-SiO2-H2O and MgO-Al2O3-SiO2-H2).Chemical Geology, Vol. 418, pp. 16-29.MantleExperimental petrology

Abstract: We performed laser-heated diamond anvil cell experiments on bulk compositions in the systems MgO-SiO2-H2O (MSH) and MgO-Al2O3-SiO2-H2O (MASH) that constrain the stability of hydrous phases in Earth’s lower mantle. Phase identification by synchrotron powder diffraction reveals a consistent set of stability relations for the high-pressure, dense hydrous silicate phases D and H. In the MSH system phase D is stable to ~ 50 GPa, independent of temperature from ~ 1300 to 1700 K. Phase H becomes stable between 35 and 40 GPa, and the phase H out reaction occurs at ~ 55 GPa at 1600 K with a negative dT/dP slope of ~ -75 K/GPa. Between ~ 30 and 50 GPa dehydration melting occurs at ~ 1800K with a flat dT/dP slope. A cusp along the solidus at ~ 50 GPa corresponds with the intersection of the subsolidus phase H out reaction, and the dT/dP melting slope steepens to ~ 15 K/GPa up to ~ 85 GPa.
DS200712-0713
2007
Melekin, D.V.Melekin, D.V., Vernikovsky, V.A., KKKKazansky, A.Yu.Neoproterozoic evolution of Rodinia: constraints from new paleomagnetic dat a on the western margin of the Siberian Craton.Russian Geology and Geophysics, Vol. 48, pp. 32-45.RussiaPaleomagnetism
DS1981-0343
1981
Melelkina, M.P.Prokopchuk, B., Melelkina, M.P., et al.Two Types of Initial Sources of Precambrian DiamondsIzd. Nauka Kaz. Sssr, Alma-ata, Litologiya I Osadochnaya Geo, PP. 25-26.RussiaDiamond Genesis
DS200912-0711
2009
Melenevsky, V.N.Sokol, A.G., Palyanova, G.A., Palyanov, Y.N., Tomilenko, A.A., Melenevsky, V.N.Fluid regime and diamond formation in the reduced mantle: experimental constraints.Geochimica et Cosmochimica Acta, Vol. 73, 19, pp. 5820-5834.MantleDiamond genesis, crystallography
DS2002-1099
2002
MelezhikMossman, D.J., Eigendorf, G., Tokarvk, D., Gauthier-Lafave, Guckert, MelezhikThe search for fullerenes in carbonaceous substances associated with the natural11th. Quadrennial Iagod Symposium And Geocongress 2002 Held Windhoek, Abstract p. 38.GabonFullerenes
DS1991-1121
1991
Melezhik, V.A.Melezhik, V.A.An evolutionary model for Precambrian sedimentary basins of the BalticShieldInternational Geology Review, Vol. 33, No. 6, June pp. 515-524Baltic States, RussiaBasin model, Evolution
DS1994-1165
1994
Melezhik, V.A.Melezhik, V.A., Sturt, B.A.General geology and evolutionary history of early Proterozoic Polmak Pasvik Pechenga Imandra Varzuga ..Earth Science Reviews, Vol. 36, pp. 205-241Baltic ShieldGreenstone belt, Stratigraphy, volcanics
DS1994-1713
1994
Melezhik, V.A.Sturt, B.A., Melezhik, V.A., Ramsay, D.A.Early Proterozoic regolith at Pasvik, northeast Norway: paleoenvironmental implications for the Baltic ShieldTerra Nova, Vol. 6, No. 6, pp. 618-632NorwayPaleoclimatology, Sedimentology -regolith
DS1997-0761
1997
Melezhik, V.A.Melezhik, V.A., Fallick, A.E., Clark, T.Two billion year old isotopically heavy carbon: evidence from the LabradorTrough, Canada.Canadian Journal of Earth Sciences, Vol. 34, pp. 271-85.Quebec, Labrador, UngavaGeochronology, Labrador Trough
DS1998-0991
1998
Melezhik, V.A.Melezhik, V.A., Sturt, B.A.The Paleoproterozoic 2.5 - 1.7 Ga Midcontinent Rift system of the northeastern Fennoscandian Shield....Canadian Journal of Earth Sciences, Vol. 35, No. 6, June pp. 720-33.GlobalTectonIcs, back arc spreading, Pechenga Varzuga Belt
DS200612-0905
2006
Melezhik, V.A.Melezhik, V.A.Multiple causes of Earth's earliest global glaciation.Terra Nova, Vol. 18, 2, April pp. 130-137.GlobalGlaciology
DS1991-1058
1991
Melfi, A.Marker, A., Friedrich, G., Carvalho, A., Melfi, A.Control of the distribution of Manganese, Cobalt, Zinc, Zrirconium, Titanium and REEs during the evolution of lateritic covers above ultramafic complexesJournal of Geochemical Exploration, Special Publications Geochemical, Vol. 40, No. 1-3, pp. 361-384Brazil, PhilippinesCarbonatite, Geochemistry -laterites
DS1993-1611
1993
Melfi, A.Trescases, J.J., Melfi, A.Les gisements lateritiques du BresilPangea, December pp. 6-16.BrazilLaterites
DS1997-1085
1997
Melfi, A.Sondag, F., Soubies, F., Melfi, A.Hydrogeochemistry in soils and sediments in the area of the Lagoa Campestre Lake ( Salitre): chemical balancesApplied Geochemistry, Vol. 12, No. 2, March, 1, pp. 155-162Brazil, Minas GeraisRare earth elements, Laterites
DS1989-0440
1989
Melfi, A.J.Fortin, P., Trescases, J.J., Melfi, A.J., Schmitt, J.M., Thiryrare earth elements (REE) accumulations in the Curtibia basin, BrasilXiii International Geochemical Exploration Symposium, Rio 89 Brazilian Geochemical, pp. 66-68. AbstractBrazilCarbonatite, Curtiba
DS1989-1435
1989
Melfi, A.J.Soubies, F., Melfi, A.J., Aparecida Sardela, I.Zirconium mobility during lateritic weathering of alkaline rocks of Pocosde CaldasXiii International Geochemical Exploration Symposium, Rio 89 Brazilian Geochemical, p. 206. Abstract very briefBrazilAlkaline rocks, Geochemistry
DS1990-1397
1990
Melfi, A.J.Soubies, F., Melfi, A.J., Autefage, F.Geochemical behaviour of rare earth elements in alterites of phosphate and titanium ore deposits in Tapira (Minas Gerais, Brasil):importance ofphosphatesChemical Geology ( Geochem. of the Earth's surface and of min. formation, 2nd., Vol. 84, No. 1-4, July 5, pp. 377. AbstractBrazilAlkaline rocks, rare earth elements (REE) -phosphates
DS201901-0093
2018
Melgarejo, C.M.Xu, J., Melgarejo, C.M., Castillo-Oliver, M., Arques, L., Santamaria, J.Ilmenite generations in kimberlite from Banankoro, Guinea Conakry.Neues Jhabuch fur Mineralogie, Vol. 195, 3, pp. 191-204.Africa, Guineadeposit - Banankoro

Abstract: A complex mineral sequence in a kimberlite from the Banankoro Cluster (Guinea Conakry) has been interpreted as the result of magma mixing processes. The composition of the early generations of phlogopite and spinel suggest direct crystallisation of a kimberlitic magma. However, the compositional trends found in the late generations of phlogopite and spinels could suggest magma mixing. In this context, four ilmenite generations formed. The first generations (types 1 and 2) are geikielitic and are associated with spinel and phlogopite which follow the kimberlitic compositional trends. They are interpreted as produced by crystallization from the kimberlite magma. A third generation of euhedral tabular Mg-rich ilmenite (type 3) formed during the interval between two generations of serpentine. Finally, a late generation of Mn-rich ilmenite (type 4) replaces all the Ti-rich minerals and is contemporaneous with the last generation of serpophitic non-replacing serpentine. Therefore, the formation of type 3 and type 4 ilmenite took place after the crystallization of the groundmass, during late hydrothermal process. Our results suggest a detailed textural study is necessary when use Mg-rich and Mn-rich ilmenites as KIMs. © 2018 E. Schweizerbart’sche Verlagsbuchhandlung, Stuttgart, Germany.
DS200912-0635
2009
Melgarejo, J.C.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
DS201012-0632
2010
Melgarejo, J.C.Robles-Cruz, S.E., Escayola, M., Melgarejo, J.C., Watangua, M., Gali, S., Goncalves, O.A., Jackson, S.Disclosed dat a from mantle xenoliths of Angolan kimberlites based on LA-ICP-MS analyses. Catoca and Cucumbi-79International Mineralogical Association meeting August Budapest, abstract p. 553.Africa, AngolaPetrology
DS201012-0791
2010
Melgarejo, J.C.Torro, L., Villanova, C., Castillo, M., Campeny, M., Goncalves, O.A., Melgarejo, J.C.Nb and REE minerals from the Virulundo carbonatite Namibe, Angola.International Mineralogical Association meeting August Budapest, abstract p. 578.Africa, AngolaCarbonatite
DS201112-0055
2011
Melgarejo, J.C.Bambi, A.C.J.M., Costanzo, A., Melgarejo, J.C., Goncalves, A.O., Neto, A.B.Evolution of pyrochlore in pluonic carbonatites: the Tchivira Complex case, Angola.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfrica, AngolaCarbonatite
DS201112-0056
2011
Melgarejo, J.C.Bambi, A.C.J.M., Costanzo, A., Melgarejo, J.C., Goncalves, A.O., Neto, A.B.Evolution of pyrochlore in plutonic carbonatites: the Tchivira complex case, Angola.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.93-95.Africa, AngolaTchivira
DS201112-0057
2011
Melgarejo, J.C.Bambi, A.C.J.M., Costanzo, A., Melgarejo, J.C., Goncalves, A.O., Neto, A.B.Evolution of pyrochlore in plutonic carbonatites: the Tchivira complex case, Angola.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.93-95.Africa, AngolaTchivira
DS201112-0213
2011
Melgarejo, J.C.Costanzo, A., Bambi, A.C.J.M., Melgarejo, J.C.Using LA-ICP-MS to assess evolution of trace element compositions in magmatic pyrochlore from carbonatites of the Bonga Complex, Angola.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.24-26.Africa, AngolaBonga
DS201112-0214
2011
Melgarejo, J.C.Costanzo, A., Bambi, A.C.J.M., Melgarejo, J.C.Using LA-ICP-MS to assess evolution of trace element compositions in magmatic pyrochlore from carbonatites of the Bonga Complex, Angola.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.24-26.Africa, AngolaBonga
DS201112-0577
2011
Melgarejo, J.C.Lehbib, S., Arribas, A., Melgarejo, J.C., Martin, R.F.Rare element minerals of the alkaline suites of the western Sahara.Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterAfricaAlkalic
DS201112-0578
2011
Melgarejo, J.C.Lehbib, S., Arribas, A., Melgarejo, J.C., Martin, R.F.Rare element minerals of the alkaline suites of the western Sahara.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.96-98.Africa, MauritaniaCarbonatite
DS201112-0579
2011
Melgarejo, J.C.Lehbib, S., Arribas, A., Melgarejo, J.C., Martin, R.F.Rare element minerals of the alkaline suites of the western Sahara.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.96-98.Africa, MauritaniaCarbonatite
DS201112-0873
2011
Melgarejo, J.C.Robles-Cruz, S.E., Melgarejo, J.C., Escayola, M., Watangua, M., Pervov,V.Comparative composition of xenocrysts of garnet, clinopyroxene, and ilmenite from Diamondiferous and barren kimberlites from northeastern Angola.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.129-131.Africa, AngolaCatoca, Kambundu, Tchiuzo, Cuilo
DS201112-0874
2011
Melgarejo, J.C.Robles-Cruz, S.E., Melgarejo, J.C., Escayola, M., Watangua, M., Pervov,V.Comparative composition of xenocrysts of garnet, clinopyroxene, and ilmenite from Diamondiferous and barren kimberlites from northeastern Angola.Peralk-Carb 2011... workshop June 16-18, Tubingen, Germany, Abstract p.129-131.Africa, AngolaCatoca, Kambundu, Tchiuzo, Cuilo
DS201212-0113
2012
Melgarejo, J.C.Castillo-Oliver, M., Gali, S., Gonscalves, A.O., Melgarejo, J.C.Use of indicator minerals in diamond exploration: a comparison between barren and fertile kimberlites in Angola.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, AngolaGeochemistry - KIMS
DS201212-0460
2012
Melgarejo, J.C.Melgarejo, J.C., Costanzo, A., Bmbi, A.C.J.M., Goncalves, A.O., Neto, A.B.Subsolidus processes as a key factor on the distribution of Nb species in plutonic carbonatites: the Tchivira case, Angola.Lithos, Vol. 152, pp. 187-201.Africa, AngolaCarbonatite
DS201212-0590
2012
Melgarejo, J.C.Robles-Cruz, S.E., Escayola, M., Jackson, S., Gali, S., Pervov, S., Watanga, M., Goncalves, A., Melgarejo, J.C.U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: implications for diamond exploration.Chemical Geology, Vol. 310-311, pp. 137-147.Africa, AngolaDeposit - Catoca
DS201212-0732
2012
Melgarejo, J.C.Torro, L., Villanova, C., Castillo, M., Campeny, M., Goncalves, A.O., Melgarejo, J.C.Niobium and rare earth minerals from the Virulundo carbonatite, Namibe, Angola.Mineralogical Magazine, Vol. 76, 2, pp. 393-409.Africa, AngolaDeposit - Virulundo
DS201312-0121
2013
Melgarejo, J.C.Campeny, M., Kamenetsky, V., Melgarejo, J.C., Mangas, J., Bambi, A., Manuel, J.CatAnd a carbonatitic lavas ( Angola): melt inclusion evidence.Goldschmidt 2013, AbstractAfrica, AngolaCarbonatite
DS201312-0122
2013
Melgarejo, J.C.Campeny, M., Kamenetsky, V., Melgarejo, J.C., Mangas, J., Bambi, A., Manuel, J.Sodium rich magmas parental to CatAnd a carbonatitic lavas ( Angola): melt inclusion evidence.Goldschmidt 2013, AbstractAfrica, AngolaCarbonatite
DS201412-0096
2014
Melgarejo, J.C.Campeny, M., Mangas, J., Melgarejo, J.C., Bambi, A., Alfonso, P., Gernon, T., Manuel, J.The Catanga extrusive carbonatites ( Kwanza Sul, Angola): an example of explosive carbonatitic volcanism.Bulletin of Volcanology, Vol. 76, pp. 818-Africa, AngolaCarbonatite
DS201509-0387
2015
Melgarejo, J.C.Campeny, M., Kamenetsky, V.S., Melgarejo, J.C., Mangas, J., Manuel, J., Alfonso, P., Kamenetsky, M.B., Bambi, A.C.J.M., Goncalves, A.O.Carbonatitic lavas in CatAnd a ( Kwanza Sul, Angola): mineralogical and geochemical constraints on the parental melt.Lithos, Vol. 232, pp. 1-11.Africa, AngolaCarbonatite

Abstract: A set of small volcanic edifices with tuff ring and maar morphologies occur in the Catanda area, which is the only locality with extrusive carbonatites reported in Angola. Four outcrops of carbonatite lavas have been identified in this region and considering the mineralogical, textural and compositional features, we classify them as: silicocarbonatites (1), calciocarbonatites (2) and secondary calciocarbonatites produced by the alteration of primary natrocarbonatites (3). Even with their differences, we interpret these lava types as having been a single carbonatite suite related to the same parental magma. We have also estimated the composition of the parental magma from a study of melt inclusions hosted in magnetite microphenocrysts from all of these lavas. Melt inclusions revealed the presence of 13 different alkali-rich phases (e.g., nyerereite, shortite, halite and sylvite) that argues for an alkaline composition of the Catanda parental melts. Mineralogical, textural, compositional and isotopic features of some Catanda lavas are also similar to those described in altered natrocarbonatite localities worldwide such as Tinderet or Kerimasi, leading to our conclusion that the formation of some Catanda calciocarbonatite lavas was related to the occurrence of natrocarbonatite volcanism in this area. On the other hand, silicocarbonatite lavas, which are enriched in periclase, present very different mineralogical, compositional and isotopic features in comparison to the rest of Catanda lavas. We conclude that its formation was probably related to the decarbonation of primary dolomite bearing carbonatites.
DS201604-0597
2016
Melgarejo, J.C.Castilo-Oliver, M., Gali, S., Melgarejo, J.C., Griffin, W.L., Belousova, E., Pearson, N.J., Watangua, M., O'Reilly, S.Y.Trace element geochemistry and U-Pb dating of perovskite in kimberlites of the Lunda Norte province ( NE Angola): petrogenetic and tectonic implications.Chemical Geology, Vol. 426, pp. 118-134.Africa, AngolaGeochronology

Abstract: Perovskite (CaTiO3) has become a very useful mineral for dating kimberlite eruptions, as well as for constraining the compositional evolution of a kimberlitic magma and its source. Despite the undeniable potential of such an approach, no similar study had been done in Angola, the fourth largest diamond producer in Africa. Here we present the first work of in situ U-Pb geochronology and Sr-Nd isotope analyses of perovskite in six Angolan kimberlites, supported by a detailed petrographic and geochemical study of their perovskite populations. Four types of perovskite were identified, differing in texture, major- and trace-element composition, zoning patterns, type of alteration and the presence or absence of inclusions. Primary groundmass perovskite is classified either as anhedral, Na-, Nb- and LREE-poor perovskite (Ia); or euhedral, strongly zoned, Na-, Nb- and LREE-rich perovskite (Ib). Secondary perovskite occurs as reaction rims on ilmenite (IIa) or as high Nb (up to 10.6 wt% Nb2O5) perovskite rims on primary perovskite (IIb). The occurrence of these four types within the Mulepe kimberlites is interpreted as an evidence of a complex, multi-stage process that involved mingling of compositionally different melts. U-Pb dating of these perovskites yielded Lower Cretaceous ages for four of the studied kimberlites: Mulepe 1 (116.2 ± 6.5 Ma), Mulepe 2 (123.0 ± 3.6 Ma), Calonda (119.5 ± 4.3 Ma) and Cat115 (133 ± 10 Ma). Kimberlite magmatism occurred in NE Angola likely due to reactivation of deep-seated translithospheric faults (> 300 km) during the break-up of Gondwana. Sr-Nd isotope analyses of four of these kimberlites indicate that they are Group I kimberlites, which is consistent with the petrological observations.
DS201605-0819
2016
Melgarejo, J.C.Castillo-Oliver, M., Gali, S., Melgarejo, J.C., Griffin, W.L., Belousova, E., Pearson, N.J., Watangua, M., O'Reilly, S.Y.Trace element geochemistry and U-Pb dating of perovskite in kimberlites of the Lunda Norte province ( NE Angola): petrogenetic and tectonic implications.Chemical Geology, Vol. 426, pp. 118-134.Africa, AngolaDeposit - Alto Cuilo

Abstract: Perovskite (CaTiO3) has become a very usefulmineral for dating kimberlite eruptions, aswell as for constraining the compositional evolution of a kimberlitic magma and its source. Despite the undeniable potential of such an approach, no similar study had been done in Angola, the fourth largest diamond producer in Africa. Here we present the firstwork of in situ U-Pb geochronology and Sr-Ndisotope analyses of perovskite in six Angolan kimberlites, supported by a detailed petrographic and geochemical study of their perovskite populations. Four types of perovskitewere identified, differing in texture,major- and trace-element composition, zoning patterns, type of alteration and the presence or absence of inclusions. Primary groundmass perovskite is classified either as anhedral, Na-, Nb- and LREE-poor perovskite (Ia); or euhedral, strongly zoned, Na-, Nb- and LREE-rich perovskite (Ib). Secondary perovskite occurs as reaction rims on ilmenite (IIa) or as high Nb (up to 10.6 wt% Nb2O5) perovskite rims on primary perovskite (IIb). The occurrence of these four types within the Mulepe kimberlites is interpreted as an evidence of a complex, multi-stage process that involved mingling of compositionally different melts. U-Pb dating of these perovskites yielded Lower Cretaceous ages for four of the studied kimberlites: Mulepe 1 (116.2±6.5Ma),Mulepe 2 (123.0±3.6Ma), Calonda (119.5±4.3 Ma) and Cat115 (133±10Ma). Kimberlite magmatism occurred in NE Angola likely due to reactivation of deep-seated translithospheric faults (N300 km) during the break-up of Gondwana. Sr-Nd isotope analyses of four of these kimberlites indicate that they are Group I kimberlites, which is consistent with the petrological observations.
DS201710-2263
2012
Melgarejo, J.C.Robles-Cruz, S.E., Melgarejo, J.C., Gali, S., Escayola, M.Major and trace element compositions of indicator minerals that occur as macro and megacrysts, and of xenoliths, from kimberlites in northeastern Angola.Minerals NOTE Date, Vol. 2, pp. 318-337.Africa, Angoladeposits - Tchiuzo, Anomaly 116, Catoca, Alt Cuilo-4, Cuilo-63, Cucumbi-79.

Abstract: In this study, we compare the major- and trace-element compositions of olivine, garnet, and clinopyroxene that occur as single crystals (142 grains), with those derived from xenoliths (51 samples) from six kimberlites in the Lucapa area, northeastern Angola: Tchiuzo, Anomaly 116, Catoca, Alto Cuilo-4, Alto Cuilo-63 and Cucumbi-79. The samples were analyzed using electron probe microanalysis (EPMA) and laser-ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). The results suggest different paragenetic associations for these kimberlites in the Lucapa area. Compositional overlap in some of the macrocryst and mantle xenolith samples indicates a xenocrystic origin for some of those macrocrysts. The presence of mantle xenocrysts suggests the possibility of finding diamond. Geothermobarometric calculations were carried out using EPMA data from xenoliths by applying the program PTEXL.XLT. Additional well calibrated single-clinopyroxene thermobarometric calculations were also applied. Results indicate the underlying mantle experienced different equilibration conditions. Subsequent metasomatic enrichment events also support a hypothesis of different sources for the kimberlites. These findings contribute to a better understanding of the petrogenetic evolution of the kimberlites in northeastern Angola and have important implications for diamond exploration.
DS201711-2506
2017
Melgarejo, J.C.Castillo-Oliver, M., Melgarejo, J.C., Gali, S., Pervov, V., Goncalves, A.O., Griffin, W.L., Pearson, N.J., O'Reilly, S.Y.Use and misuse of Mg- and Mn- rich ilmenite in diamond exploration: a petrographic and trace element approach. Congo-Kasai cratonLithos, Vol. 292-293, pp. 348-363.Africa, Angoladeposit - CAT115, Tchiuzo

Abstract: Magnesian ilmenite is a common kimberlite indicator mineral, although its use in diamond exploration is still controversial. Complex crystallisation and replacement processes have been invoked to explain the wide compositional and textural ranges of ilmenite found in kimberlites. This work aims to shed light on these processes, as well as their implications for diamond exploration. Petrographic studies were combined for the first time with both major- and trace-element analyses to characterise the ilmenite populations found in xenoliths and xenocrysts in two Angolan kimberlites (Congo-Kasai craton). A multi-stage model describes the evolution of ilmenite in these pipes involving: i) crystallisation of ferric and Mg-rich ilmenite either as metasomatic phases or as megacrysts, both in crustal and in metasomatised mantle domains; ii) kimberlite entrainment and xenolith disaggregation producing at least two populations of ilmenite nodules differing in composition; iii) interaction of both types with the kimberlitic magma during eruption, leading to widespread replacement by Mg-rich ilmenite along grain boundaries and fractures. This process produced similar major-element compositions in ilmenites regardless of their primary (i.e., pre-kimberlitic) origin, although the original enrichment in HFSE (Zr, Hf, Ta, Nb) observed in Fe3 +-rich xenocrysts is preserved. Finally (iv) formation of secondary Mn-ilmenite by interaction with a fluid of carbonatitic affinity or by infiltration of a late hydrothermal fluid, followed in some cases by subsolidus alteration in an oxidising environment. The complexities of ilmenite genesis may lead to misinterpretation of the diamond potential of a kimberlite during the exploration stage if textural and trace-element information is disregarded. Secondary Mg-enrichment of ilmenite xenocrysts is common and is unrelated to reducing conditions that could favour diamond formation/preservation in the mantle. Similarly, Mn-rich ilmenite should be disregarded as a diamond indicator mineral, unless textural studies can prove its primary origin.
DS201801-0017
2017
Melgarejo, J.C.Giuliani, A., Campeny, M., Kamenetsky, V.S., Afonso, J.C., Maas, R., Melgarejo, J.C., Kohn, B.P., Matchen, E.L., Mangas, J., Goncalves, A.O., Manuel, J.Southwestern Africa on the burner: Pleistocene carbonatite volcanism linked to deep mantle upwelling in Angola.Geology, Vol. 45, 11, pp. 971=974.Africa, Angolacarbonatite - Catanda

Abstract: The origin of intraplate carbonatitic to alkaline volcanism in Africa is controversial. A tectonic control, i.e., decompression melting associated with far-field stress, is suggested by correlation with lithospheric sutures, repeated magmatic cycles in the same areas over several million years, synchronicity across the plate, and lack of clear age progression patterns. Conversely, a dominant role for mantle convection is supported by the coincidence of Cenozoic volcanism with regions of lithospheric uplift, positive free-air gravity anomalies, and slow seismic velocities. To improve constraints on the genesis of African volcanism, here we report the first radiometric and isotopic results for the Catanda complex, which hosts the only extrusive carbonatites in Angola. Apatite (U-Th-Sm)/He and phlogopite 40Ar/39Ar ages of Catanda aillikite lavas indicate eruption at ca. 500-800 ka, more than 100 m.y. after emplacement of abundant kimberlites and carbonatites in this region. The lavas share similar high-µ (HIMU)-like Sr-Nd-Pb-Hf isotope compositions with other young mantle-derived volcanics from Africa (e.g., Northern Kenya Rift; Cameroon Line). The position of the Catanda complex in the Lucapa corridor, a long-lived extensional structure, suggests a possible tectonic control for the volcanism. The complex is also located on the Bié Dome, a broad region of fast Pleistocene uplift attributed to mantle upwelling. Seismic tomography models indicate convection of deep hot material beneath regions of active volcanism in Africa, including a large area encompassing Angola and northern Namibia. This is strong evidence that intraplate late Cenozoic volcanism, including the Catanda complex, resulted from the interplay between mantle convection and preexisting lithospheric heterogeneities.
DS201808-1784
2012
Melgarejo, J.C.Robles-Cruz, S., Melgarejo, J.C., Escayola, M.Major and trace element compositions of indicator minerals that occur as macro and megacrysts, and xenoliths from kimberlites in northeastern Angola.Minerals, Vol. 2, 4, ppp. 318-337.Africa, Angolageochemistry

Abstract: In this study, we compare the major- and trace-element compositions of olivine, garnet, and clinopyroxene that occur as single crystals (142 grains), with those derived from xenoliths (51 samples) from six kimberlites in the Lucapa area, northeastern Angola: Tchiuzo, Anomaly 116, Catoca, Alto Cuilo-4, Alto Cuilo-63 and Cucumbi-79. The samples were analyzed using electron probe microanalysis (EPMA) and laser-ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). The results suggest different paragenetic associations for these kimberlites in the Lucapa area. Compositional overlap in some of the macrocryst and mantle xenolith samples indicates a xenocrystic origin for some of those macrocrysts. The presence of mantle xenocrysts suggests the possibility of finding diamond. Geothermobarometric calculations were carried out using EPMA data from xenoliths by applying the program PTEXL.XLT. Additional well calibrated single-clinopyroxene thermobarometric calculations were also applied. Results indicate the underlying mantle experienced different equilibration conditions. Subsequent metasomatic enrichment events also support a hypothesis of different sources for the kimberlites. These findings contribute to a better understanding of the petrogenetic evolution of the kimberlites in northeastern Angola and have important implications for diamond exploration.
DS201808-1797
2018
Melgarejo, J.C.Xu, J., Melgarejo, J.C., Castillo-Oliver, M.Styles of alteration of Ti oxides of the kimberlite groundmass: implications on the petrogenesis and classification of kimberlites and similar rocks.Minerals, Vol. 8, 2, pp. 51-66.Indiaperovskite

Abstract: The sequence of replacement in groundmass perovskite and spinel from SK-1 and SK-2 kimberlites (Eastern Dharwar craton, India) has been established. Two types of perovskite occur in the studied Indian kimberlites. Type 1 perovskite is found in the groundmass, crystallized directly from the kimberlite magma, it is light rare-earth elements (LREE)-rich and Fe-poor and its ?NNO calculated value is from -3.82 to -0.73. The second generation of perovskite (type 2 perovskite) is found replacing groundmass atoll spinel, it was formed from hydrothermal fluids, it is LREE-free and Fe-rich and has very high ?NNO value (from 1.03 to 10.52). Type 1 groundmass perovskite may be either replaced by anatase or kassite along with aeschynite-(Ce). These differences in the alteration are related to different f(CO2) and f(H2O) conditions. Furthermore, primary perovskite may be strongly altered to secondary minerals, resulting in redistribution of rare-earth elements (REE) and, potentially, U, Pb and Th. Therefore, accurate petrographic and chemical analyses are necessary in order to demonstrate that perovskite is magmatic before proceeding to sort geochronological data by using perovskite. Ti-rich hydrogarnets (12.9 wt %-26.3 wt % TiO2) were produced during spinel replacement by late hydrothermal processes. Therefore, attention must be paid to the position of Ca-Ti-garnets in the mineral sequence and their water content before using them to classify the rock based on their occurrence.
DS201808-1798
2018
Melgarejo, J.C.Xu, J., Melgarejo, J.C., Castillo-Oliver, M.Ilmenite as a recorder of kimberlite history from mantle to surface: examples from Indian kimberlites. Bastar, Dharwar cratonsMineralogy and Petrology, 10.1007/s00710-018-0616-5 13p.Indiailmentite

Abstract: Indian kimberlites occur in the Bastar craton (Central India) and in the Eastern Dharwar craton (EDC) Southern India. Nearly 100 kimberlite pipes have been discovered in the Eastern Dharwar craton of southern India, and they are distributed in three distinct fields: 1) the southern Wajrakarur kimberlite field (WKF); 2) the northern Narayanpet kimberlite field (NKF); and 3) the Raichur kimberlite field (RKF) (Chalapathi Rao et al, 2013). Nine kimberlites have been selected for this study: three came from the Siddanpalli cluster of RKF (SK-1, SK-2 and SK-3); other six kimberlites came from WKF, from Chigicherla (CC-4 and CC-5), Kalyandurg (KL-3 and KL-4), Lattavaram (P-3) and Mulligripally (P-5). The kimberlite emplacement took place during the Mesoproterozoic, around 1.1 Ga (Chalapathi Rao et al., 2013). Ilmenite is one of the classic diamond indicator minerals (DIMs) and for long it has been used as a guide for kimberlite exploration. The aim of this study is to evaluate the petrogenetic information that can be provided from the textural and geochemical study of the different ilmenite generations present in the Indian kimberlites studied in this work.
DS201811-2619
2018
Melgarejo, J.C.Xu, J., Melgarejo, J.C., Castillo, O., Montgarri, A., Laia, S., Santamaria, J.Ilmenite generations in kimberlite from Banankoro, Guinea. ConakryNeues Jahrbuch fur Mineralogie, doi:.org/10.1127/njma/2018/0096Africa, Guineadeposit - Banakoro

Abstract: A complex mineral sequence in a kimberlite from the Banankoro Cluster (Guinea Conakry) has been interpreted as the result of magma mixing processes. The composition of the early generations of phlogopite and spinel suggest direct crystallisation of a kimberlitic magma. However, the compositional trends found in the late generations of phlogopite and spinels could suggest magma mixing. In this context, four ilmenite generations formed. The first generations (types 1 and 2) are geikielitic and are associated with spinel and phlogopite which follow the kimberlitic compositional trends. They are interpreted as produced by crystallization from the kimberlite magma. A third generation of euhedral tabular Mg-rich ilmenite (type 3) formed during the interval between two generations of serpentine. Finally, a late generation of Mn-rich ilmenite (type 4) replaces all the Ti-rich minerals and is contemporaneous with the last generation of serpophitic non-replacing serpentine. Therefore, the formation of type 3 and type 4 ilmenite took place after the crystallization of the groundmass, during late hydrothermal process. Our results suggest a detailed textural study is necessary when use Mg-rich and Mn-rich ilmenites as KIMs.
DS201906-1342
2019
Melgarejo, J.C.Robles Cruz, S., Melgarejo, J.C., Gali, S.Revisiting the complexity of kimberlites from northeastern Angola.GAC/MAC annual Meeting, 1p. Abstract p. 166.Africa, Angoladeposit - Catoca

Abstract: The tectonic setting of northeastern Angola was influenced by the opening of the South Atlantic Ocean, which reactivated deep NE-SW-trending faults during the early Cretaceous. The new interpretation of a kimberlitic pulse during the middle of the Aptian and the Albian, which provides precise data on the age of a significant diamond-bearing kimberlite pulse in Angola, will be an important guide in future diamond exploration. These findings contribute to a better understanding of the petrogenetic evolution of the kimberlites in northeastern Angola and have important implications for diamond exploration. Six kimberlite pipes within the Lucapa structure in northeastern Angola have been investigated using major and trace element geochemistry of mantle xenoliths, macro- and megacrysts. Geothermobarometric calculations were carried out using xenoliths and well-calibrated single crystals of clinopyroxene. Geochronological and isotopic studies were also performed where there were samples available of sufficient quality. Results indicate that the underlying mantle experienced variable conditions of equilibration among the six sites. Subsequent metasomatic enrichment events also support a hypothesis of different sources for these kimberlites. The U/Th values suggest at least two different sources of zircon crystals from the Catoca suite. These different populations may reflect different sources of kimberlitic magma, with some of the grains produced in U- and Th-enriched metasomatized mantle units, an idea consistent with the two populations of zircon identified on the basis of their trace element compositions. This research shows the absence of fresh Mg-rich ilmenite in the Catoca kimberlite (one of the largest bodies of kimberlite in the world), as well as the occurrence of Fe3+-rich ilmenite, do not exclude the presence of diamond in the kimberlite. This is a new insight into the concept of ilmenite and diamond exploration and leads to the conclusion that compositional attributes must be evaluated in light of textural attributes.
DS201212-0589
2009
Melgarejo, J-C.Robles-Cruz, S., Lomba, A., Melgarejo, J-C., Gali, S., Olimpio Goncalves, A.The Cucumbi kimberlite, NE Angola: problems to discriminate fertile and barren kimberlites.Revist de la Sociedad de Mineralogia ( in english), pp. 159-160.Africa, AngolaDeposit - Cucumbi
DS201708-1711
2017
Melgarejo Draper, J.C.Melgarejo Draper, J.C.Styles of alteration of Ti oxides of the kimberlite groundmass: implications on the petrogenesis and classification of kimberlites and similar rocks.11th. International Kimberlite Conference, PosterTechnologykimberlite classification
DS201212-0591
2012
Melgarejoa, J.C.Robles-Cruz, S.E., Galla, S., Escayoblab, M., Melgarejoa, J.C.Heterogeneous mantle beneath the Lunda area in Angola.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, AngolaDeposit - Lunda area
DS201212-0050
2012
Melgareto, J.C.Bambi, A.C.J.M., Costanzo, A., Goncalves, A.O., Melgareto, J.C.Tracing the chemical evolution of primary pyrochlore from plutonia to volcanic carbonatites: the role of fluorine.Mineralogical Magazine, Vol. 76, 2, pp. 377-392.TechnologyCarbonatite, chemistry
DS1985-0436
1985
Melgonov, S.V.Melgonov, S.V.Radiochemistry and Origin of Micaceous Lamprophyres.(russian)Trudy Institute Geol. Geofiz. Akad. Nauk SSSR, (Russian), No. 613, pp. 140-157RussiaMinette, Kersantite
DS2002-1417
2002
Melhuish, A.Scherwath, M., Stern, T., Melhuish, A., Molnar, P.Pn anisotropy and distributed upper mantle deformation associated with a continential transform fault.Geophysical Research Letters, Vol. 89, No. 8, April 15, pp. 16-MantleTectonics, Geophysics - seismics
DS201112-0404
2011
Meliksetian, K.Halama, R., Savov, I.P., Meliksetian, K.The Tezhsar alkaline complex ( Armenia).Peralk-Carb 2011, workshop held Tubingen Germany June 16-18, PosterEurope, ArmeniaAlkalic
DS200412-0725
2004
Melkovets, V.Griffin, W.L., O'Reilly, S.Y., Doyle, B.J., Pearson, N.J., Coopersmith, H., Kivi, K., Melkovets, V., PokhilenkLithosphere mapping beneath the North American plate.Lithos, Vol. 77, 1-4, Sept. pp. 873-922.Canada, Northwest Territories, Europe, GreenlandArchon, Proton, Tecton, Slave Craton, Kapuskasing Struc
DS201610-1886
2016
Melkovets, V.G.Melkovets, V.G., Rezvukhin, D.I., Belousova, E.A., Griffin, W.L., Sharygin, I.S., Tretiakova, I.G., Pokhilenko, N.P., Sobolev, N.V.Cr-rich rutile: a powerful tool for diamond exploration.Lithos, in press available 8p.Russia, SiberiaDeposit - Internationalnaya

Abstract: Mineralogical studies and U-Pb dating have been carried out on rutile included in peridotitic and eclogitic garnets from the Internatsionalnaya pipe, Mirny field, Siberian craton. We also describe a unique peridotitic paragenesis (rutile + forsterite + enstatite + Cr-diopside + Cr-pyrope) preserved in diamond from the Mir pipe, Mirny field. Compositions of rutile from the heavy mineral concentrates of the Internatsionalnaya pipe and rutile inclusions in crustal almandine-rich garnets from the Mayskaya pipe (Nakyn field), as well as from a range of different lithologies, are presented for comparison. Rutile from cratonic mantle peridotites shows characteristic enrichment in Cr, in contrast to lower-Cr rutile from crustal rocks and off-craton mantle. Rutile with Cr2O3 > 1.7 wt% is commonly derived from cratonic mantle, while rutiles with lower Cr2O3 may be both of cratonic and off-cratonic origin. New analytical developments and availability of standards have made rutile accessible to in situ U-Pb dating by laser ablation ICP-MS. A U-Pb age of 369 ± 10 Ma for 9 rutile grains in 7 garnets from the Internatsionalnaya pipe is consistent with the accepted eruption age of the pipe (360 Ma). The equilibrium temperatures of pyropes with rutile inclusions calculated using Ni-in-Gar thermometer range between ~ 725 and 1030 °C, corresponding to a depth range of ca ~ 100-165 km. At the time of entrainment in the kimberlite, garnets with Cr-rich rutile inclusions resided at temperatures well above the closure temperature for Pb in rutile, and thus U-Pb ages on mantle-derived rutile most likely record the emplacement age of the kimberlites. The synthesis of distinctive rutile compositions and U-Pb dating opens new perspectives for using rutile in diamond exploration in cratonic areas.
DS1960-0581
1965
Melledoe, H.J.Meyer, H.O.A., Melledoe, H.J., Nave, E.Natural Irradiation Damage in Ivory Coast DiamondsNature., Vol. 206, P. 392.GlobalDiamond Genesis
DS201909-2040
2019
Melleton, J.Gaillard, E., Nabyl, Z., Tuduri, J., Di Carlo, I., Melleton, J., Bailly, L.The effects of F, Cl, P and H2O on the immiscibility and rare metals partitioning between carbonate and phonolite melts.Goldschmidt2019, 1p. AbstractGlobalcarbonatite - REE

Abstract: Carbonatite and alkaline magma constitute one of the principal resources of rare metals (REE, Nb, Ti, Zr). Carbonatite rare metals enrichment is mainly considered as the result of hydrothermal or supergen processes. However, the magmatic processes linked to carbonatites genesis and differentiation are still debated and whether these processes can significantly impact on the rare metal concentrations remains unclear. Experimental studies have shown that immiscibility processes between carbonate and silicate melts can lead to both REE enrichments and depletions in carbonatites. Anionic species (F, Cl, P or S) and water may impact both melt compositions and expand the immiscibility gap. Morever, anionic species are assumed to play an important role in REE behaviour in carbonate melts [1]. Indeed, halogens may occur in carbonatites as immiscible salt melts in melt inclusions [2] and primary REE- fluoride minerals have been identified as magmatic phases in carbonatites. Such occurrences thus question on the role of salt (carbonate, phosphate, fluoride and chloride) melts in REE and other rare metals partitioning. F, Cl, P and also H2O may all significantly increase the window of primary REE enrichment in carbonatites. Here we present high pressure and high temperature experiments made in piston-cylinder (850 to 1050°C, 8kb) simulating the immiscibility between carbonate and differentiated alkaline melts. We added F, Cl, P and H2O in order to assess the effect of salts and water on the immiscibility gap and on the rare metals partitoning between carbonatite and evolved silicate melts. The partitioning data are analysed using LA-ICP-MS, nano-SIMS, FTIR and RAMAN. The characterization of rare metal partition coefficients allow to determine the relative importance of F, Cl, P and H2O on carbonatites rare metal enrichments at evolved magmatic stage.
DS201909-2065
2019
Melleton, J.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
Melleton, J.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.
DS202009-1643
2020
Melleton, J.Nabyl, Z., Massuyeau, M.,Gaillard, F., Tuduri, J., Gregory, G-M., Trong, E., Di Carlo, I., Melleton, J., Bailly, L. A window in the course of alkaline magma differentiation conducive to immiscible REE-rich carbonatite.Geochimica et Cosmochimica Acta, Vol. 282, pp. 297-323.Africa, East Africacarbonatites

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.
DS1989-1003
1989
Mellini, M.Mellini, M., Cundari, A.On the reported presence of potassium in clinopyroxene from potassium richlavas: a transmission electron microscope studyMineralogical Magazine, Vol. 53, pp. 311-314AustraliaLamproite, Leucitite Begargo Hill
DS201012-0495
2009
Mellini, M.Merlino, S., Mellini, M.Marianoite, a new member of the cuspidine group from the Prairie Lake silicocarbonatite, Ontario. Discussion.Canadian Mineralogist, Vol. 47, 5, pp. 1275-1279.Canada, OntarioCarbonatite
DS1991-1122
1991
Mellish, M.Mellish, M., Bailey, J.Surface miningMining Annual Review, June 1991, pp. 207-219GlobalMining, Applications -mineral exploration/mining
DS1991-1123
1991
Mellish, M.Mellish, M., Bailey, J.Brief note on the Venetia diamond mine processing plantMining Annual Review, June 1991, p. 219South AfricaMineral processing, Venetia, De Beers
DS2002-1183
2002
Mello, E.F.Oliveira, E.P., Mello, E.F., McNaughton, N.Reconnaissance U Pb geochronology of Precambrian quartzites from the Caldeirao beltJournal of South American Earth Sciences, Vol, 15, 3, pp. 349-62.Brazil, BahiaOrogen - Itabuna-Salvador-Curaca, Paleoproterozoic - not specific to diamonds
DS200412-1465
2002
Mello, E.F.Oliveira, E.P., Mello, E.F., McNaughton, N.Reconnaissance U Pb geochronology of Precambrian quartzites from the Caldeirao belt and their basement, NE Sao Francisco Craton,Journal of South American Earth Sciences, Vol, 15, 3, pp. 349-62.South America, BrazilOrogen - Itabuna-Salvador-Curaca Paleoproterozoic - not specific to diamonds
DS1900-0687
1908
Mellor, E.T.Mellor, E.T.Summary of a Traverse in the Northwestern Zoutpansberg Districts.Transvaal Geological Survey Annual Report., FOR 1907, PP. 103-106.Africa, South AfricaRegional Geology, Seta, Borgdahl
DS1900-0713
1908
Mellor, E.T.Trevor, T.G., Mellor, E.T.Report on a Reconnaisance of the North Western Zoutpansbergdistrict.Transvaal Geological Survey Memoir., No. 3A, 40P.Africa, South AfricaRegional Geology
DS1910-0506
1916
Mellor, E.T.Mellor, E.T.Diamonds in Rand BanketChemical, Metallurgical and Mineralogical Society STH. AFR. Proceedings, MARCH, ALSO: MINING MAGAZINE, Vol. 14, No. 6, JUNE PP. 350-3South AfricaBlank
DS2002-0791
2002
Mellqvist, C.Juhlin, C., Elming, S.A., Mellqvist, C., Ohlander, B., Weihed, P., Wikstrom, A.Crustal refectivity near Archean Proterozoic boundary in northern Sweden andGeophysical Journal International, Vol.150,1,pp.180-197.SwedenGeophysics - seismics, Boundary
DS2000-0346
2000
MellusoGomes, C.B, Bennio, Melluso, Morbidelli, Morra, RubertiPetrology and geochemistry of Cretaceous alkaline dike swarm from Cabo Frio southeastern Brasil.Igc 30th. Brasil, Aug. abstract only 1p.Brazil, southeastDike swarm - alkaline rocks
DS1997-0133
1997
Melluso, L.Brotzu, P., Gomes, C.B., Melluso, L., et al.Petrogenesis of coexisting SiO2 undersaturated to SiO2 Over saturated felsic igneous rocks: alkaline complex..Lithos, Vol. 40, No. 2-4, July, pp. 133-156.BrazilAlkaline rocks, Itataia area
DS2000-0594
2000
Melluso, L.Lustrino, M., Melluso, L., Morra, V.The role of lower continental crust and lithospheric mantle in the genesis of Plio-Pleistocene volcanics...Earth and Planetary Science Letters, Vol. 180, No. 3-4, pp.253-70.MantleLithosphere
DS2000-0649
2000
Melluso, L.Melluso, L., Morra VincenzoPetrogenesis of late Cenozoic mafic alkaline rocks of the Nosy Be archipelago relationship with Comorean...Igc 30th. Brasil, Aug. abstract only 1p.MadagascarMagmatism
DS2000-0650
2000
Melluso, L.Melluso, L., Morra, V., Bennio, L., Brotzu, P., RicciPetrology and geochemistry of the Tamatave dike swarm (Madagascar Cretaceous igneous province)Igc 30th. Brasil, Aug. abstract only 1p.MadagascarDike swarm
DS2001-0770
2001
Melluso, L.Melluso, L., Morra, V., Brotzu, P., Mahoney, J.J.The Cretaceous igneous province of Madagascar: geochemistry and petrogenesis of lavas and dykes...Journal of Petrology, Vol. 42, No. 7, July, pp. 1249-78.Madagascar, central westernIgneous rocks - petrology
DS2002-1046
2002
Melluso, L.Melluso, L., Sethna, S.F., D'Antonio, M., Javeri, BennioGeochemistry and petrogenesis of sodic and potassic mafic alkaline rocks in the Deccan volcanic Province.Mineralogy and Petrology, Vol. 74, 2-4, pp. 323-42.IndiaAlkaline rocks, Deposit - Mumbai area
DS2003-0934
2003
Melluso, L.Melluso, L., Morra, V., Brotszu, P., D'Antonio, M., Bennio, L.Petrogenesis of the Late Cretaceous tholeiitic magmatism in the passive margins ofGeological Society of America Special Paper, No. 362, chapter 6.MadagascarMagmatism
DS2003-0935
2003
Melluso, L.Melluso, L., Morra, V., Brotzu, P., Franciosi, L., Lieberknecht, A.M.P., BennioGeochemical provinciality in the Cretaceous basaltic magmatism of northernJournal of the Geological Society of London, Vol. 160, 3, pp. 477-488.MadagascarBlank
DS2003-0936
2003
Melluso, L.Melluso, L., Morra, V., Brotzu, P., Franciosi, L., Petteruti Lieberknecht, A.M.Geochemical provinciality in the Cretaceous basaltic magmatism of northernJournal of the Geological Society of London, Vol. 160, 3, May pp. 477-88.MadagascarMagmatism - not specific to diamonds
DS200412-1294
2004
Melluso, L.Melluso, L., Censi, P., Perini, G., et al.Chemical and isotopic ( C, O, Sr, Nd) characteristics of the Xiluvo carbonatite ( central western Mozambique).Mineralogy and Petrology, Vol. 80, 3-4, March pp. 201-213.Africa, MozambiqueCarbonatite
DS200412-1295
2003
Melluso, L.Melluso, L., Morra, V., Brotzu, P., Franciosi, L., Lieberknecht, A.M.P., Bennio, L.Geochemical provinciality in the Cretaceous basaltic magmatism of northern Madagascar: mantle source immplications.Journal of the Geological Society, Vol. 160, 3, pp. 477-488.Africa, MadagascarGeochemistry - not specific to diamonds
DS200412-1296
2003
Melluso, L.Melluso, L., Morra, V., Brotzu, P., Franciosi, L., Petteruti Lieberknecht, A.M., Benno, L.Geochemical provinciality in the Cretaceous basaltic magmatism of northern Madagascar: mantle source implications.Journal of the Geological Society, Vol. 160, 3, May pp. 477-88.Africa, MadagascarMagmatism - not specific to diamonds
DS200512-0716
2005
Melluso, L.Melluso, L., Morra, V., Bortsu, P., Tommasini, S., Renna, MR, Duncan, R., Franciosi, L., D'Amelio, F.Geochronology and petrogenesis of the Cretaceous Antampombato Ambatovy Complex and associated dyke swarm, Madagascar.Journal of Petrology, Vol. 46, 10, pp. 1963-1996.Africa, MadagascarGeochronology - dike
DS200712-0114
2007
Melluso, L.Brotzu, P., Melluso, L., Bennio, L., Gomes, Lustrino, Morbidelli, Morra, Ruberti, Tassarini, D'AntonioPetrogenesis of the Early Cenozoic potassic alkaline complex of Morro de Sao Joao, southeastern Brazil.Journal of South American Earth Sciences, Vol. 24, 1, June pp. 93-115.South America, BrazilAlkalic
DS200812-0738
2008
Melluso, L.Melluso, L., Lustrino, M., Ruberti, E., Brotzu, P., Barros Gomes, C., Morbidelli, Morra, Svisero, AmelioMajor and trace element composition of olivine perovskite, clinopyroxene, Cr Fe Ti oxides, phlogopite and host kamafugites and kimberlites, Alto Paranaiba,Canadian Mineralogist, Vol. 46, no. 2 Feb. pp. 19-40.South America, BrazilKamafugite, kimberlite
DS201012-0460
2010
Melluso, L.Lustrino, M., Marazzo, M., Melluso, L., Tassinari, C.C.G., Brotzu, P., Gomes, C.B., Morbidelli, RubertiPetrogenesis of early Cretaceous silicic volcanism in se Uruguay: the role of mantle and crustal sources.Geochemical Journal, Vol. 44, 1, pp. 1-22.South America, UruguayRhyolites - not specific diamonds - backgrounder
DS201012-0493
2010
Melluso, L.Melluso, L., Srivastava, R.K., Guarino, V., Zanetti, A., Sinha, A.K.Mineral compositions and petrogenetic evolution of the ultramafic alkaline carbonatitic complex of Sung Valley, northeastern India.The Canadian Mineralogist, Vol. 48, 2, pp. 205-229.IndiaCarbonatite
DS201112-0391
2011
Melluso, L.Guarino, V., Azzone, Brotzu, De Barros, Melluso, L., Morbidelli, Ruberti, Tassinari, BrilliMagmatism and fenitization in the Cretaceous potassium alkaline carbonatitic complex of Ipanema, Sao Paulo State, Brazil.Mineralogy and Petrology, In press available,South America, BrazilCarbonatite
DS201112-0663
2011
Melluso, L.Melluso, L., Le Roex, A.P., Morra, V.Petrogenesis and Nd Pb Sr isotope geochemistry of the Cenozoic olivine melilitites and the olivine nephelinites ( ankaratrites) in Madagascar.Lithos, in press available 40p.Africa, MadagascarMelilitite
DS201212-0267
2012
Melluso, L.Guarino, V., Guitarrari Azzone, R., Brotzu, P., Celso de Barros Gomes, Melluso, L., Morbidelli, L.,Ruberti, E.,Tassinari, C., Brilli, M.Magmatism and fenitization in the Cretaceous potassium-alkaline-carbonatitic complex of Ipanema Sao Paulo State, Brazil.Mineralogy and Petrology, Vol. 104, 1-2, pp. 43-61.South America, BrazilCarbonatite
DS201212-0268
2012
Melluso, L.Guarino, V., Wu, F-Y., Lustrino, M., Melluso, L.,Brotzu, P., De Barros Gomes, C., Ruberti, E., Tassarini, C.C.G., Svisero, D.P.U Pb ages, Sr Nd isotope geochemistry, and petrogenesis of kimberlites, kamafugites and phlogopite picrites of the Alto Paranaiba Igneous Province, Brazil.Chemical Geology, in press available 57p.South America, BrazilGeochronology
DS201212-0461
2012
Melluso, L.Melluso, L., Rajesh,K., Srivastava, C.M., Petrone, V., Guarino, V., Sinha, A.K.Mineralogy, magmatic affnity and evolution of the Early Cretaceous alkaline complex of Jasra, Shillong Plateau, northeastern India.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractIndiaDeposit - Jasra
DS201212-0592
2012
Melluso, L.Rocco, I., Lustrino, M., Zanetti, A., Morra, V., Melluso, L.Petrology of ultramafic xenoliths in Cenozoic alkaline rocks of northern Madagascar ( Nosy Be Archipelago)Journal of South American Earth Sciences, in press availableAfrica, MadagascarBasanites, Foidites
DS201212-0700
2012
Melluso, L.Srivasta, R.K., Melluso, L., Petrone, C.M., Guarino, V., Sinha, A.K.Evolution of the Early Cretaceous alkaline Jasra complex, Shillong Plateau, northeastern India.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractIndiaDeposit - Jasra
DS201312-0350
2013
Melluso, L.Guarino, V., Wu, F-Y., Lustrino, M., Melluso, L., Brotzu, P., Barros Gomes, C.de, Ruberti, E., Tassarini, C.C.G., Svisero, D.P.U-Pb ages, Sr, Nd isotope geochemistry, and petrogenesis of kimberlites, kamafugites and phlogopte-picrites of the Alto Paranaiba Igneous Province, Brazil.Chemical Geology, Vol. 353, pp. 65-82.MantleUHP
DS201312-0748
2013
Melluso, L.Rocco, I., Lustino, M., Zanetti, A., Morra, V., Melluso, L.Petrology of ultramafic xenoliths in Cenozoic alkaline rocks of northern Madagascar. Nosy Be Journal of South American Earth Sciences, Vol. 41, pp. 122-139.Africa, MadagascarBasanites, Foidites
DS201508-0348
2015
Melluso, L.Cucciniello, C., Tucker, R.D., Jourdan, F., Melluso, L., Morra, V.The age and petrogenesis of alkaline magmatism in the Ampasindava Peninsula and Nosy Be archipelago, northern Madagascar.Mineralogy and Petrology, in press available 23p.Africa, MadagascarBasanites, Foidites

Abstract: The Ampasindava alkaline province consists of a series of circular and elliptical intrusions, lava flows, dyke swarms and plugs of Cenozoic age emplaced into the Mesozoic-Cenozoic sedimentary rocks of the Antsiranana basin (NW Madagascar) and above the crystalline basement. The magmatism in the Ampasindava region is linked to a NW-SE trending extensional tectonic setting. New 40Ar/39Ar age determinations on feldspar separate of alkali granites and basaltic dykes yielded ages of 18.01?±?0.36 Ma and 26?±?7 Ma, respectively. Alkali basalts and basanites, nepheline syenites and phonolites, and silica saturated-to-oversaturated syenites, trachytes, granites and rhyolites are the main outcropping lithologies. These rocks have sodic affinity. The felsic rocks are dominant, and range from peraluminous to peralkaline. The mantle-normalized incompatible element patterns of the mafic lavas match those of Na-alkaline lavas in within-plate rift settings. The patterns are identical in shape and absolute concentrations to those of the Bobaomby (Cap d’Ambre) and Massif d’Ambre primitive volcanic rocks. These geochemical features are broadly compatible with variable degrees of partial melting of incompatible element-enriched mantle sources. The mineralogical and geochemical variations are consistent with fractional crystallization processes involving removal of olivine, feldspar, clinopyroxene, amphibole, Fe-Ti oxides and apatite. Removal of small amount of titanite explains the concave upward lanthanide pattern in the evolved nepheline syenites and phonolites, which are additionally rich in exotic silicates typical of agpaitic magmas (eudialyte, F-disilicates).
DS201705-0853
2017
Melluso, L.Melluso, L., Guarino, V., Lustrino, M., Morra, V., de'Gennaro, R.The REE- and HFSE-bearing phases in the Itatiaia alkaline complex ( Brazil) and geochemical evolution of feldspar-rich felsic melts.Mineralogical Magazine, Vol. 81, 2, pp. 217-250.South America, BrazilAlkaline rocks

Abstract: The Late Cretaceous Itatiaia complex is made up of nepheline syenite grading to peralkaline varieties, quartz syenite and granite, emplaced in the metamorphic rocks of the Serra do Mar, SE Brazil. The nepheline syenites are characterized by assemblages with alkali feldspar, nepheline, Fe-Ti oxides, clinopyroxene, amphibole, apatite and titanite, while the peralkaline nepheline syenites have F-disilicates (rinkite, wöhlerite, hiortdahlite, låvenite), britholite and pyrophanite as the accessory phases. The silica-oversaturated rocks have alkali feldspar, plagioclase, quartz, amphibole, clinopyroxene and Fe-Ti oxides; the chevkinite-group minerals are the featured accessory phases and are found with allanite, fluorapatite, fluorite, zircon, thorite, yttrialite, zirconolite, pyrochlore and yttrocolumbite. The major- and trace-element composition of the Itatiaia rocks have variations linked to the amount of accessory phases, have smooth, enriched chondrite-normalized rare-earth element (REE) distribution patterns in the least-evolved nepheline syenites and convex patterns in the most-evolved nepheline syenites. The REE distribution patterns of the quartz syenites and granites show a typical pattern caused by fractional crystallization of feldspar and amphibole, in an environment characterized by relatively high oxygen fugacity (>NiNiO buffer) and high concentrations of H2O and F, supporting the crystallization of hydrous phases, fluorite and F-disilicates. The removal of small amounts of titanite in the transition from the least-evolved to the most-evolved nepheline syenites stems from petrogenetic models involving REE, and is shown to be a common feature of the magmatic evolution of many other syenitic/ trachytic/ phonolitic complexes of the Serra do Mar and elsewhere.
DS201708-1580
2017
Melluso, L.Rocco, I., Zanetti, A., Melluso, L., Morra, V.Ancient depleted and enriched mantle lithosphere domains in northern Madagascar: geochemical and isotopic evidence from spinel-to-plagioclase-bearing ultramafic xenoliths. Massif d'Ambre and BobaombyChemical Geology, in press available, 16p.Africa, Madagascarmelting

Abstract: Mantle xenoliths hosted in Cenozoic alkaline rocks of northern Madagascar (Massif d'Ambre and Bobaomby volcanic fields) are spinel lherzolites, harzburgites and rare websterites. Petrography, electron microprobe, LA-ICP-MS and thermal ionization mass spectrometry techniques allowed to recognize domains characterized by variable degree of partial melting and extent of re-enrichment processes: 1) refractory spinel-to-spinel + plagioclase-lherzolites, with clinopyroxenes having marked LREE (Light Rare Earth Elements) depletion ((La/Yb)N ~ 0.2) and very high 143Nd/144Nd (0.513594), which represent a limited and shallow portion of old mantle that suffered low degree partial melting (2–3%) and was later accreted to the lithosphere. These lherzolites acted as a low-porosity region, being, in places, percolated by small volumes of melts shortly before eruption; 2) lherzolites and harzburgites that suffered variable degrees of partial melt extraction (up to 15%), assisted and/or followed by pervasive, porous flow infiltration of alkaline melts in a relatively large porosity region, leading to the creation of a wide area rich in secondary mineral phases (i.e. olivine, clinopyroxene and pargasitic amphibole), enriched in incompatible elements (e.g., LaN/YbN in clinopyroxene up to 15) and having radiogenic Sr and unradiogenic Nd; 3) websterites and wehrlite-bearing samples that record differentiation processes of alkaline melts highly enriched in Th, U and LREE, not yet documented in the erupted volcanics of northern Madagascar. The mantle xenoliths of northern Madagascar show a regional decrease of the equilibration temperature from to SW (up to 1180 °C, Nosy Be Archipelago) to the NE (up to 900 °C, Bobaomby district). A significant lithologic and geochemical variation of the shallow lithospheric mantle beneath northern Madagascar is noted, in contrast with the relatively uniform geochemical and isotopic composition of the host alkali basalt and basanite lavas.
DS201709-1994
2017
Melluso, L.Guarino, V., Wu, F-Y., Melluso, L., de Barros Gomes, C., Tassinari, C.C.G., Ruberti, E., Brilli, M.U Pb ages, geochemistry, C-O-Nd-Sr-Hf isotopes and petrogeneis of the Catalao II carbonatitic complex ( Alto Paranaiba igneous province, Brazil): implucations for regional scale heterogeneities in the Brazilian carbonatite associations.International Journal of Earth Sciences, Vol. 106, 6, pp. 1963-1989.South America, Brazilcarbonatite - Catalao II

Abstract: The Catalão II carbonatitic complex is part of the Alto Paranaíba Igneous Province (APIP), central Brazil, close to the Catalão I complex. Drill-hole sampling and detailed mineralogical and geochemical study point out the existence of ultramafic lamprophyres (phlogopite-picrites), calciocarbonatites, ferrocarbonatites, magnetitites, apatitites, phlogopitites and fenites, most of them of cumulitic origin. U–Pb data have constrained the age of Catalão I carbonatitic complex between 78 ± 1 and 81 ± 4 Ma. The initial strontium, neodymium and hafnium isotopic data of Catalão II (87Sr/86Sri= 0.70503–0.70599; eNdi= -6.8 to -4.7; 176Hf/177Hf = 0.28248–0.28249; eHfi= -10.33 to -10.8) are similar to the isotopic composition of the Catalão I complex and fall within the field of APIP kimberlites, kamafugites and phlogopite-picrites, indicating the provenance from an old lithospheric mantle source. Carbon isotopic data for Catalão II carbonatites (d13C = -6.35 to -5.68 ‰) confirm the mantle origin of the carbon for these rocks. The origin of Catalão II cumulitic rocks is thought to be caused by differential settling of the heavy phases (magnetite, apatite, pyrochlore and sulphides) in a magma chamber repeatedly filled by carbonatitic/ferrocarbonatitic liquids (s.l.). The Sr–Nd isotopic composition of the Catalão II rocks matches those of APIP rocks and is markedly different from the isotopic features of alkaline-carbonatitic complexes in the southernmost Brazil. The differences are also observed in the lithologies and the magmatic affinity of the igneous rocks found in the two areas, thus demonstrating the existence of regional-scale heterogeneity in the mantle sources underneath the Brazilian platform.
DS201904-0783
2019
Melluso, L.Srivastava, R.K., Guarino, V., Wu, F-Y., Melluso, L., Sinha, A.K.Evidence of sub continental lithospheric mantle sources and open system crystallization processes from in situ U-Pb ages and Nd-Sr-Hf isotope geochemistry of the Cretaceous ultramafic alkaline (carbonatite) intrusions from the Shillong Plateau, north-eastLithos, Vol. 330, 1, pp. 108-119.Indiacarbonatite

Abstract: New in-situ U-Pb ages and Sr-Nd-Hf isotopic data on mineral phases of the Sung Valley and Jasra ultramafic-alkaline-(carbonatite) intrusions (Shillong Plateau, India) shed new light on the petrogenetic processes of volcanism in north-eastern India during the Cretaceous. Perovskites of Sung Valley dunite, ijolite and uncompahgrite yielded U-Pb ages of 109.1?±?1.6, 104.0?±?1.3 and 101.7?±?3.6?Ma, respectively. A U-Pb age of 106.8?±?1.5?Ma was obtained on zircons of a Sung Valley nepheline syenite. Perovskite of a Jasra clinopyroxenite yielded an age of 101.6?±?1.2?Ma, different from the U-Pb age of 106.8?±?0.8?Ma on zircon of Jasra syenites. The variation in Sr-Nd-Hf isotopic compositions [initial 87Sr/86Sr?=?0.70472 to 0.71080; eNd i?=?-10.85 to +0.86; eHf i?=?-7.43 to +1.52] matches the bulk-rock isotopic composition of the different rock units of Sung Valley and Jasra. Calcite and apatite in the carbonatites, the perovskite in a dunite, and the bulk-rock carbonatites of Sung Valley intrusion have the lowest initial 87Sr/86Sr and eNd, taken to be the best proxies of the mantle source composition, which is dominated by components derived from the lithospheric mantle. The alkaline intrusions of north-eastern India are significantly younger than the Sylhet tholeiitic magmatism. The silicate rocks of both intrusions have isotopic composition trending to that of the underlying Shillong crust, indicating the effects of fractional crystallization and low-pressure crustal contamination during the emplacement of the various intrusive magma pulses.
DS202012-2233
2020
Melluso, L.Melluso, L., Sethna, S.F., Srivastava, R.K.First occurrence of melilite, potassic richterite and tetraferriphlogopite in Deccan Trap- related alkaline rocks, and its petrogenetic significance: the Rajpuri ijolitenephlinite intrusion, Murud, Mumbai area, India.Journal of Mineralogy and Geochemistry, https://doi.org/ 10.1127/njma/2020/0236Indiamelilite
DS1984-0510
1984
MelnicenkoMelnicenkoLaminated Structure Proposed.(russian)Priroda, (Russian), Vol. 7, pp. 22-30RussiaRef. Fleischer United States Geological Survey (usgs) Of 88-689.mineralogical Refs. 198, Mineralogy
DS1984-0511
1984
Melnichenko, V.M.Melnichenko, V.M., Nikulin, YU.N.Cleavage in DiamondsPriroda., 1984 No. 7, PP. 22-30.RussiaCrystallography
DS1985-0372
1985
Melnichuk, E.V.Krutikhovska, Z.O., Melnichuk, E.V., Slonitska, S.G., Orlyuk, M.I.Regional magnetic anomalies in the southwestern Russian platform and smallscale prediction of mineral resources.(Russian)Dopov. Akad. Nauk UKR. RSR Ser. B., Geokl. Khim. Biol., (Russian), No. 4, pp. 36-41RussiaGeophysics
DS1999-0469
1999
Melnick, O.F.Melnick, O.F.Volcanology: fragmenting magmaNature, Vol. 397, No. 6718, Feb. 4, p. 394.MantleMagma, Phreatomagmatic - not specific to kimberlite
DS1986-0437
1986
MelnikKharkiv, A.D., Serenko, V.P., Zinchuk, N.N., Namchur, G.P., MelnikCarbon isotope composition of carbonates from deep horizons In the MirpipeGeochem. Internat, Vol. 23, No. 7, pp. 79-84RussiaIsotope, Geochronology
DS201112-0971
2011
Melnik, A.E.Skublov, S.G., Astafev, B.Yu., Marin, Yu.B., Berezin, A.V., Melnik, A.E., Presnyakov, S.L.New dat a on the age of eclogites from the Belmorian mobile belt at Gridino settlement area.Doklady Earth Sciences, Vol. 439, 2, pp.1163-1170.RussiaEclogite
DS201412-0838
2013
Melnik, A.E.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
DS201906-1348
2019
Melnik, A.E.Skublov, S.G., Tolstov, A.V., Baranov, L.N., Melnik, A.E., Levashova, E.V.First data on the geochemistry and U-Pb age of zircons from the kamaphorites of the Tomtor alkaline ultrabasic massif, Arctic Yakutia. ( carbonatite)Geochemistry, in press available 11p.Russia, Yakutiadeposit - Tomtor

Abstract: Zircon from Tomtor syenites and kamaphorites was dated following the U-Pb method (SHRIMP-II), and the distribution of trace and rare-earth elements (REE) was studied at the same zircon point using an ion microprobe. The main zircon population from syenites was dated at 402?±?7 Ma, while the age range of single zircon grains was 700-660 M?. Different-aged zircon groups from syenites exhibited the characteristics of magmatic zircon, but their concentrations of REE and other trace elements differed markedly. The REE distribution in 700-660-M? zircon is consistent with that of the typical zircon from syenites (Belousova et al., 2002), while the heavy rare-earth elements (HREE), P, Ti, and Y concentrations of ca. 400-Ma zircon differ from those of older zircon. This is the first isotope-geochemical study of zircon from kamaphorites, and the U-Pb age of ca. 400 M? is within the error limits with of the main zircon population from syenites. The considerable enrichment of REE, C?, Ti, Sr, Y, Nb, and Ba in zircon from kamaphorites may be partly due to the presence of burbankite microinclusions. The trace-element distribution pattern of zircon from kamaphorites is very similar to the geochemical characteristics of zircon from Tiksheozero carbonatites (Tichomirowa et al., 2013). The new age dates for Tomtor syenites and kamaphorites, consistent with 700-660 M? and ca. 400 M? events, support the zircon (Vladykin et al., 2014) and pyrochlore (Antonov et al., 2017) age dates determined following the U-Pb method and those of biotite obtained following the 40Ar-39Ar method (Vladykin et al., 2014).
DS202012-2251
2020
Melnik, A.E.Skublov, S.G., Tolstov, A.V., Baranov, L.N., Melnik, A.E., Levashova, E.V.First data on the geochemistry and U-Pb age of zircons from the kamaphorites of the Tomtor alkaline-ultrabasic massif, Arctic Yakutia.Geochemistry , in press available, 11p. PdfRussia, Yakutiadeposit - Tomtor

Abstract: Zircon from Tomtor syenites and kamaphorites was dated following the U-Pb method (SHRIMP-II), and the distribution of trace and rare-earth elements (REE) was studied at the same zircon point using an ion microprobe. The main zircon population from syenites was dated at 402?±?7 Ma, while the age range of single zircon grains was 700-660 M?. Different-aged zircon groups from syenites exhibited the characteristics of magmatic zircon, but their concentrations of REE and other trace elements differed markedly. The REE distribution in 700-660-M? zircon is consistent with that of the typical zircon from syenites (Belousova et al., 2002), while the heavy rare-earth elements (HREE), P, Ti, and Y concentrations of ca. 400-Ma zircon differ from those of older zircon. This is the first isotope-geochemical study of zircon from kamaphorites, and the U-Pb age of ca. 400 M? is within the error limits with of the main zircon population from syenites. The considerable enrichment of REE, C?, Ti, Sr, Y, Nb, and Ba in zircon from kamaphorites may be partly due to the presence of burbankite microinclusions. The trace-element distribution pattern of zircon from kamaphorites is very similar to the geochemical characteristics of zircon from Tiksheozero carbonatites (Tichomirowa et al., 2013). The new age dates for Tomtor syenites and kamaphorites, consistent with 700-660 M? and ca. 400 M? events, support the zircon (Vladykin et al., 2014) and pyrochlore (Antonov et al., 2017) age dates determined following the U-Pb method and those of biotite obtained following the 40Ar-39Ar method (Vladykin et al., 2014).
DS1993-0401
1993
Melnik, A.Y.Egorov, L.S., Melnik, A.Y., Ukhanov, A.V.On 1st discovered kimberlite with syngenetic shliren of calcitic carbonatite from a dike in Antarktida.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 328, No. 2, January pp. 230-233GlobalCarbonatite, Calcite
DS1995-2103
1995
Melnik, A.Yu.Yegorov, L.S., Melnik, A.Yu., Ukhanov, A.V.The first Antarctic occurrence of a dike kimberlite containing syngenetic calcite carbonatite schlieren.Doklady Academy of Sciences, Vol. 329, No. 2, Jan. pp. 104-108.AntarcticaKimberlite, Dike
DS200612-1397
2006
Melnik, E.A.Suvorov, V.D., Melnik, E.A., Thybo, H., Perchuk, E., Parasotka, B.S.Seismic velocity model of the crust and uppermost mantle around the Mirnyi kimberlite field in Siberia.Tectonophysics, Vol. 420, 1-2, June 26, pp. 49-73.Russia, SiberiaGeophysics - seismic, Mirnyi
DS201012-0774
2010
Melnik, E.A.Suvorov, V.D., Mishenkina, Z.R., Melnik, E.A.Upper mantle roots of Siberian craton basement structures along the Rift DSS profile.Russian Geology and Geophysics, Vol. 51, pp. 885-897.Russia, SiberiaGeophysics
DS1982-0660
1982
Melnik, I.M.Zinchuk, N.N., Melnik, I.M., Kharkiv, A.D.Pyroaurite in Yakutian Kimberlite Rocks and Its GenesisDoklady Academy of Sciences AKAD. NAUK SSSR., Vol. 267, No. 3, PP. 722-728.RussiaBlank
DS1983-0352
1983
Melnik, I.M.Kharkiv, A.D., Melnik, I.M., et al.Regularities of the Secondary Mineral Distribution in Kimberlite Rocks of the Upper Horizons of the Udachnaia Pipe (yakutia).Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 269, No. 1, PP. 205-207.RussiaMineralogy
DS1983-0653
1983
Melnik, I.M.Zinchuk, N.N., Melnik, I.M., Kharkiv, A.D.Features of the Composition and Genesis of Brucite from Yakutian Kimberlites.Doklady Academy of Sciences AKAD. NAUK SSSR., Vol. 269, No. 2, PP. 449-453.RussiaGenesis
DS1984-0798
1984
Melnik, I.M.Zinchuk, N.N., Melnik, I.M., Kharkiv, A.D.First Occurrences of Ferroszaibelyite in Kimberlite RocksDoklady Academy of Sciences Nauk SSSR., Vol. 275, No. 2, PP. 459-464.RussiaMineralogy
DS1989-1684
1989
Melnik, I.M.Zinchuk, N.N., Kriuchkovalski, A.I., Melnik, I.M.Change of kimberlites at the contact with dolerites(exemplified byYakutia).(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 307, No. 4, pp. 954-957RussiaAlteration
DS1984-0512
1984
Melnik, N.Melnik, N.Textural Evidence for the Origin of the Prairie Lake Carbonatite Alkali Rock Complex.Msc. Thesis, Queen's University, 81P.Canada, OntarioBlank
DS200712-0290
2006
Melnik, N.Ekimov, E., Sidorov, V., Rakhmaninia, A., Melnik, N., Timofeev, M., Sadykov, R.Synthesis, structure and physical properties of boron doped diamond.Inorganic Materials, Vol. 42, 11, Nov. pp. 1198-1204.TechnologyDiamond mineralogy
DS1990-1111
1990
Melnik, N.A.Nivin, V.A., Melnik, N.A.On the influence of radioactivity on the gas content in alkalineigneousrocks.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 1, January 1990, pp. 106-109RussiaAlkaline rocks, Gas content
DS200412-0513
2004
Melnik, N.N.Ekimov, E.A., Sidorov, V.A., Bauer, E.D., Melnik, N.N., Curro, N.J., Thompson,J.D., Stishov, S.M.Superconductivity in diamond.Nature, No. 6982,April 1, pp. 542-44.TechnologyDiamond - morphology
DS200412-0514
2004
Melnik, N.N.Ekimov, E.A., Sidorov, V.A., Melnik, N.N., Gierlotka, S., Presz, A.Synthesis of polycrystalline diamond in the boron carbide graphite and boron graphite systems under high pressure and temperaturJournal of Materials Research, Vol. 39, 15, pp. 4957-4960.TechnologyDiamond synthesis
DS201804-0736
2018
Melnik, N.N.Simakov, S.K., Melnik, N.N., Vyalov, V.I.Nanodiamond formation at the lithogenesis and low-stages of regional metamorphism. DonbassDoklady Earth Sciences, Vol. 478, 2, pp. 214-218.Russiaspectroscopy

Abstract: Samples of gilsonite from Adzharia, anthraxolite and graphite of coal from Taimyr, shungite from Karelia, and anthracite from Donbass are studied using Raman spectroscopy. Peaks at 1600 cm-1, indicating the presence of nanographite, are recorded in all samples. The anthracite sample from Donbass, 1330 cm-1, corresponds to the sp3-line of carbon hybridization conforming to a nanodiamond. It is concluded that in nature diamonds can be formed at late stages of lithogenesis (catagensis, metagenesis), and for coals, it can occur at the zeolite stage of regional metamorphism of rocks, before the green schist stage.
DS2000-0651
2000
Melnik, O.Melnik, O.Dynamics of two phase conduit flow of high viscosity gas saturated magma: large variations of sustained ..Bulletin. Volcanology, Vol. 62, No. 3, pp. 153-70.GlobalMagmatism
DS200912-0130
2009
melnik, O.Costa, A., Sparks, R.J.S., Macedonio, G., melnik, O.Effects of wall rock elasticity on magma flow in dykes during explosive eruptions.Earth and Planetary Science Letters, Vol. 288, 3-4, pp. 455-462.MantleMagmatism - not specific to diamonds
DS201112-0210
2011
Melnik, O.Costa, A., Gottsman, J., Melnik, O., Sparks, R.S.J.A stress controlled mechanism for the intensity of very large magnitude explosive eruptions.Earth and Planetary Science Letters, Vol. 310, 1-2, pp. 161-166.MantleDyke fed eruptions - column collapse
DS201212-0431
2012
Melnik, O.Maimon, O., Lyakhovsky, V., Melnik, O., Navon, O.The propagation of a dyke driven by gas saturated magma.Geophysical Journal International, Vol. 189, 2, pp. 956-966.MantleDykes
DS201709-1962
2017
Melnik, O.E.Borisova, A.Y., Zagrtdenov, N.R., Toplis, M.J., Bohrson, W.A., Nedelec, A., Safonov, O.G., Pokrovski, G.S., Ceileneer, G., Melnik, O.E., Bychkov, A.Y., Gurenko, A.A., Shscheka, S., Terehin, A., Polukeev, V.M., Varlamov, D.A., Gouy, S., De Parseval, P.Making Earth's continental crust from serpentinite and basalt. Goldschmidt Conference, abstract 1p.Mantleperidotites

Abstract: How the Earth's continental crust was formed in the Hadean eon is a subject of considerable debates [1-4]. For example, shallow hydrous peridotites [2,5], in particular the Hadean Earth's serpentinites [6], are potentially important ingredients in the creation of the continental ptoto-crust, but the mechanisms of this formation remain elusive. In this work, experiments to explore serpentinite-basalt interaction under conditions of the Hadean Earth were conducted. Kinetic runs lasting 0.5 to 48 hours at 0.2 to 1.0 GPa and 1250 to 1300°C reveal dehydration of serpentinite and release of a Si-Al-Na-K-rich aqueous fluid. For the first time, generation of heterogeneous hydrous silicic melts (56 to 67 wt% SiO2) in response to the fluid-assisted fertilisation and the subsequent partial melting of the dehydrated serpentinite has been discovered. The melts produced at 0.2 GPa have compositions similar to those of the bulk continental crust [2,3]. These new findings imply that the Earth's sialic proto-crust may be generated via fluid-assisted melting of serpentinized peridotite at shallow depths (=7 km) that do not require plate subduction during the Hadean eon. Shallow serpentinite dehydration and melting may be the principal physico-chemical processes affecting the earliest lithosphere. Making Earth's continental crust from serpentinite and basalt.
DS202012-2206
2020
Melnik, O.E.Borisova, A.Y., Bindeman, I.N., Toplis, M.J., Zagrtdenov, N.R., Guignard, J., Safonov, O.G., Bychkov, A.Y., Shcheka, S., Melnik, O.E., Marcelli, M., Fehrenbach, J.Zircon survival in shallow asthenosphere and deep lithosphere.American Mineralogist, Vol. 105, pp. 1662-1671. pdfMantlemelting

Abstract: Zircon is the most frequently used mineral for dating terrestrial and extraterrestrial rocks. However, the system of zircon in mafic/ultramafic melts has been rarely explored experimentally and most existing models based on the felsic, intermediate and/or synthetic systems are probably not applicable for prediction of zircon survival in terrestrial shallow asthenosphere. In order to determine the zircon stability in such natural systems, we have performed high-temperature experiments of zircon dissolution in natural mid-ocean ridge basaltic and synthetic haplobasaltic melts coupled with in situ electron probe microanalyses of the experimental products at high current. Taking into account the secondary fluorescence effect in zircon glass pairs during electron microprobe analysis, we have calculated zirconium diffusion coefficient necessary to predict zircon survival in asthenospheric melts of tholeiitic basalt composition. The data imply that typical 100 micron zircons dissolve rapidly (in 10 hours) and congruently upon the reaction with basaltic melt at mantle pressures. We observed incongruent (to crystal ZrO2 and SiO2 in melt) dissolution of zircon in natural mid-ocean ridge basaltic melt at low pressures and in haplobasaltic melt at elevated pressure. Our experimental data raise questions about the origin of zircons in mafic and ultramafic rocks, in particular, in shallow oceanic asthenosphere and deep lithosphere, as well as the meaning of the zircon-based ages estimated from the composition of these minerals. Large size zircon megacrysts in kimberlites, peridotites, alkali basalts and other magmas suggest the fast transport and short interaction between zircon and melt.The origin of zircon megacrysts is likely related to metasomatic addition of Zr into mantle as any mantle melting episode should obliterate them.
DS201811-2621
2018
Melnik, R.Yang, H., Xiao, J., Yao, Z., Zhang, X., Younus, F., Melnik, R., Wen, B.Homogeneous and heterogenous dislocation nucleation in diamond.Diamond & Related Materials, Vol. 88, pp. 110-117.Mantlediamond morphology

Abstract: Dislocation nucleation plays a key role in plastic deformation of diamond crystal. In this paper, homogeneous and heterogeneous nucleation nature for diamond glide set dislocation and shuffle set dislocation is studied by combining molecular dynamics method and continuum mechanics models. Our results show that although heterogeneous dislocation nucleation can decrease its activation energy, the activation energy at 0?GPa for diamond heterogeneous nucleation is still in the range of 100?eV. For glide set and shuffle set homogeneous nucleation, their critical nucleation shear stress approaches to diamond's ideal shear strength which implies that those dislocations do not nucleate before diamond structural instability only by a purely shearing manner. While for glide set and shuffle set heterogeneous nucleation, their critical nucleation shear stresses are 28.9?GPa and 48.2?GPa, these values are less than diamond's ideal shear strength which implies that these dislocations may be nucleated heterogeneously under certain shear stress condition. In addition, our results also indicate there exists a deformation mode transformation for diamond deformation behavior at strain rate of 10-3/s. Our results provide a new insight into diamond dislocation nucleation and deformation.
DS1997-0917
1997
Melnik, U.Pokhilenko, N.P., McDonald, J., Melnik, U., McCorquodaleIndicator minerals of CL-25 kimberlite pipe Slave Craton, NorthwestTerritories, Canada.Russian Geology and Geophysics, Vol. 38, No. 2, pp. 550-558.Northwest TerritoriesGeochemistry, Deposit - CL-25
DS1982-0427
1982
Melnik, Y.M.Melnik, Y.M., Zinchuk, N.N., Kharkiv, A.D.Principal Associations of Secondary Minerals in Yakutian Kimberlitic Rocks.Mineral. Sbornik L'vov, Vol. 36, No. 2, PP. 76-83.GlobalPetrology, Udachnaya, Tunguska
DS1983-0446
1983
Melnik, Y.M.Melnik, Y.M., Zinchuk, N.N., Kharkiv, A.D.Morphology of Sulfide Crystals of Kimberlites of Yakutia.(russian)Mineral Sborn. (L'Vov), (Russian), Vol. 37, No. 1, pp. 78-81RussiaSulphides
DS1984-0513
1984
Melnik, Y.M.Melnik, Y.M., Zinchuk, N.N., Kharkiv, A.D.Borates from Kimberlite from Yakutia.(russian)Mineral Sbornik (L'Vov), (Russian), Vol. 38, No. 1, pp. 12-18RussiaBlank
DS1986-0904
1986
Melnik, Y.M.Zinchuk, N.N., Melnik, Y.M.Secondary minerals in the Mir kimberlite pipe and characteristics of their distribution. (Russian)Izv. Vyssh. Uch. Zaved., Geol. I Razved. (Russian), No. 4, pp. 54-62RussiaBlank
DS1995-2150
1995
Melnik, Yu. M.Zinchuk, N.N., Melnik, Yu. M.To the formation of serpentine in kimberlite pipesProceedings of the Sixth International Kimberlite Conference Almazy Rossii Sakha abstract, p. 12, 13.Russia, YakutiaAlteration - kimberlites, Serpentinization
DS1960-1203
1969
Melnik, YU.M.Rozhkov, I.S., Melnik, YU.M., Kharkiv, A.D.Old Kimberlite Residuum of the 23rd Soviet Communist Party Congress pipe, Yakutia.Doklady Academy of Science USSR, Earth Science Section., Vol. 188, No. 1-6, PP. 112-115.RussiaKimberlite, Clay
DS1982-0428
1982
Melnik, YU.M.Melnik, YU.M., Zinchuk, N.N., Kharkiv, A.D.Principal associations of secondary minerals in Yakutiankimberliticrocks.(Russian)Mineral Sbornik (L'Vov), (Russian), Vol. 36, No. 2, pp. 76-83RussiaBlank
DS1983-0654
1983
Melnik, YU.M.Zinchuk, N.N., Melnik, YU.M., Kharkiv, A.D.Some Laws Controlling the Distribution of Secondary Formations in Kimberlites of Yakutia Explempified by the Udachnaya Pipe.Geol. Geophysics Academy of Science Sssr Siberian Branch, No. 10, OCTOBER.RussiaGenesis
DS1983-0655
1983
Melnik, YU.M.Zinchuk, N.N., Melnik, YU.M., Kharkiv, A.D.Some Principles of Distribution of Secondary Formations in kimberlites of Yukutiaas Exemplified by the Udachnaya Pipe.Soviet Geology and GEOPHYS., Vol. 24, No. 10, PP. 88-94.RussiaKimberlite Genesis
DS1984-0799
1984
Melnik, YU.M.Zinchuk, N.N., Melnik, YU.M., Kharkiv, A.D.Pyroaurite in Kimberlitic Rocks of Yakutia and Its GenesisDoklady Academy of Science USSR, Earth Science Section., Vol. 267, No. 1-6, JUNE PP. 157-161.RussiaGenesis
DS1984-0800
1984
Melnik, YU.M.Zinchuk, N.N., Melnik, YU.M., Kharkiv, A.D.First Ferroszaibelyite Finds in Kimberlitic Rocks #2Doklady Academy of Science USSR, Earth Science Section, Vol. 275, No. 1-6, pp. 103-107RussiaMir Pipe, Boron, Mineral Chemistry
DS1984-0801
1984
Melnik, YU.M.Zinchuk, N.N., Melnik, YU.M., Kharkiv, A.D.Magnetite from Kimberlite from Yakutia.(russian)Mineral Sbornik (L'Vov), (Russian), Vol. 38, No. 2, pp. 81-84RussiaBlank
DS1985-0768
1985
Melnik, YU.M.Zinchuk, N.N., Melnik, YU.M., Kharkiv, A.D.First Ferroszaibelyite Finds in Kimberlitic Rocks #1Doklady Academy of Science USSR, Earth Science Section, Vol. 275, July pp. 103-107RussiaYakutia, Mineralogy
DS1985-0769
1985
Melnik, YU.M.Zinchuk, N.N., Melnik, YU.M., Matsyuk, S.S., et al.Anhydrous Sulfates from the Kimberlites of Yakutia. (russian)Mineral. Sbornik., (Russian), Vol. 39, No. 2, pp. 33-40RussiaBlank
DS1986-0436
1986
Melnik, Yu.M.Kharkiv, A.D., Serenko, V.P., Mamchur, G.P., Melnik, Yu.M.Carbon isotope composition of carbonates from deep horizons Of the Mirpipe.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 3, pp. 304-310RussiaGeochronology, Carbonate
DS1986-0905
1986
Melnik, Yu.M.Zinchuk, N.N., Melnik, Yu.M.Secondary minerals of kimberlites from the Mir pipe and their distribution patterns.(Russian)Izv. Vyssh. Uchebn. Zaved. Geol. Razved., (Russian), No. 4, pp. 54-62GlobalMineralogy
DS1986-0906
1986
Melnik, Yu.M.Zinchuk, N.N., Melnik, Yu.M.Pseudomorphs of chalcedony after pyrite.(Russian)Mineral. Sb. (Lvov), (Russian), Vol. 40, No. 1, pp. 96-98RussiaKimberlite, Yakutia
DS1987-0833
1987
Melnik, Yu.M.Zinchuk, N.N., Kharkiv, A.D., Melnik, Yu.M., Movchan, N.P.Accessory minerals of kimberlite.(Russian)Izd. Nauka Dumka, Kiev, Ukrainian SSR, (in Russian), 284pRussiaBlank
DS1987-0834
1987
Melnik, Yu.M.Zinchuk, N.N., Kharkiv, A.D., Melnik, Yu.M., Movchan, N.P.Secondary minerals of kimberlites. (Russian)Naukova Dumka Kiev, (Russian), 284pRussiaBlank
DS1988-0783
1988
Melnik, Yu.M.Zinchuk, N.N., Melnik, Yu.M., Antonyuk, B.P.Bitumens from the Udachnaya kimberlite pipe.(Russian)Izv. Vyssch. Uchebn. Zaved., Geol. Razved., (Russian), No. 12, pp. 21-27RussiaBitumens, Deposit -Udachnaya
DS1991-1938
1991
Melnik, Yu.M.Zinchuk, N.N., Kryuchkov, A.I., Melnik, Yu.M.Alteration of kimberlite at the contact with dolerite as in YakutiaDoklady Academy of Sciences, Earth Sci. Section, Vol. 307, No. 1-6, pp. 148-151RussiaMineralogy, metamorphism
DS1995-2151
1995
Melnik, Yu.M.Zinchuk, N.N., Melnik, Yu.M.Some aspects of the kimberlite bodies formationProceedings of the Sixth International Kimberlite Conference Almazy Rossii Sakha abstract, p. 18.Russia, YakutiaMagma - glass, Meimmechites
DS1970-0108
1970
Mel'nik, YU.I.Khar'kiv, A.D., Mel'nik, YU.I.Ancient Weathered Crust of Kimberlite Pipe " Xxiii Congres Of Cpsu " in the Malo-botuobia Region.In: Geology, Petrography And Mineralogy of Magmatic Formatio, RussiaBlank
DS1996-1418
1996
Melnikov, A.Theunissen, K., Klerkx, J., Melnikov, A., Mruma, A.Mechanisms of inheritance of rift faulting in the western branch of the east African Rift, Tanzania.Tectonics, Vol. 15, No. 4, August pp. 776-790.TanzaniaTectonics, Rift, faults
DS1982-0224
1982
Melnikov, A.I.Grabkin, O.V., Zamareyev, S.M., Melnikov, A.I.The Correlation of Endogene Processes of the Siberian Platform and its Framework.Izd. Nauka Sib. Otd. Novosibirsk, Sssr., 129P.Russia, SiberiaKimberlite, Zoning, Diamonds, Genesis
DS1993-0483
1993
Melnikov, F.P.Garanin, V.K., Kasimova, F.I., Melnikov, F.P.New minerals-inclusions in zircons from the kimberlite pipe- Mir. (Russian)Doklady Academy of Sciences Akad. Nauk, (Russian), Vol. 330, No. 1, May pp. 75-78Russia, YakutiaMineral inclusions, Deposit -Mir
DS1995-0581
1995
Melnikov, F.P.Garanin, V.K., Kasimova, F.I., Melnikov, F.P.New inclusion minerals from zircons in the Mir kimberlite pipeDoklady Academy of Sciences Acad. Science Russia, Vol. 331, No. 5, May pp. 54-59.RussiaMineralogy -zircons, Deposit -Mir
DS1996-0479
1996
Melnikov, F.P.Garanin, V.K., Kasimva, F.I., Melnikov, F.P.Hydrocarbon inclusions in zircon from the Mir kimberlite pipeDoklady Academy of Sciences, Vol. 336, pp. 187-189.Russia, YakutiaInclusions -zircon, Deposit -Mir
DS1988-0392
1988
Melnikov, V.S.Kvasnitsa, V.N., Krochuk, V.M., Melnikov, V.S., Yatsenko, V.G.Crystal morphology of graphite from magmatic rocks Of the Ukrainianshield.(Russian)Mineral Zhurn., (Russian), Vol. 10, No. 5, pp. 68-76RussiaCarbonatite
DS1998-1174
1998
MelnykPokhilenko, N.P., McDonald, J.A., Melnyk, Hall, ShimizuKimberlites of Camsell Lake field and some features of construction and composition of lithosphere roots...7th. Kimberlite Conference abstract, pp. 699-701.Northwest TerritoriesCraton - Slave, Deposit - Camsell Lake
DS1989-1556
1989
Melnyk, A.J.Vilayan, S., Melnyk, A.J., Singh, R.D., Nuttall, K.Rare earths: their mining, processing and growing industrial usageMining Engineering, Vol. 41, No. 1, January pp. 13-18. Database # 17622GlobalRare earths, Overview -economics
DS1995-1506
1995
Melnyk, W.Pokhilenko, N.P., McDonald, J.A., Melnyk, W., McCorquodaleIndicator minerals of CL 25 kimberlite pipe, Slave Craton, northwest TerritoriesProceedings of the Sixth International Kimberlite Conference Abstracts, pp. 444-445.Northwest TerritoriesGeochemistry -indicator minerals, Deposit -CL-25 pipe
DS1998-0977
1998
Melnyk, W.McDonald, J.A., Pokhilenko, N., Melnyk, W., Hall, A.Camsell Lake kimberlites, Slave Province, northwest TerritoriesGeological Society of America (GSA) Annual Meeting, abstract. only, p.A245.Northwest TerritoriesExploration - history outline, Deposit - Camsell Lake, Snap Lake, dike
DS2002-1032
2002
Melnyk, W.McDonald, J.A., Pokhilenko, N., Melnyk, W., Hall, A.Camsell Lake kimberlites, Slave Province, Northwest TerritoriesCanadian Institute of Mining and Metallurgy, Vol. 53, Industrial Minerals of Canada, pp. 361-2.Northwest TerritoriesHistory - exploration
DS2000-0706
2000
MeloNeves, S.P., Mariano, G., Guimares, da Silva Filho, MeloIntralithospheric differentiation and crustal growth: evidence from Bororema province, northeastern BrasilGeology, Vol. 28, No. 6, June pp. 519-22.BrazilAlkaline rocks, Geochemistry, Proterozoic crustal growth
DS1998-0477
1998
Melo, M.V.L.C.Gaspar, J.C., Araujo, D.P., Melo, M.V.L.C.Olivine in carbonatitic and silicate rocks in carbonatite complexes7th International Kimberlite Conference Abstract, pp. 239-241.BrazilCarbonatite, Deposit - Catalao I, II
DS200412-1423
2004
Melo, S.C.Neves, S.P., Melo, S.C., Moura, C.A.V., Mariano, G., Ragel Da Silva, J.M.Zircon Pb Pb geochronology of the Aruaru area, northeastern Brazil: temporal constraints on the Proterozoic evolution of BorboreInternational Geology Review, Vol. 46, 1, pp. 52-63.South America, BrazilGeochronology
DS201604-0600
2016
Melosh, H.De Vries, J., Nimmo, F., Melosh, H., Jacobson, S., Morbidelli, A., Rubie, D.Impact induced melting during accretion of the Earth.Progress in Earth and Planetary Science, Vol. 3, 7p.MantleMelting

Abstract: Because of the high energies involved, giant impacts that occur during planetary accretion cause large degrees of melting. The depth of melting in the target body after each collision determines the pressure and temperature conditions of metal-silicate equilibration and thus geochemical fractionation that results from core-mantle differentiation. The accretional collisions involved in forming the terrestrial planets of the inner Solar System have been calculated by previous studies using N-body accretion simulations. Here we use the output from such simulations to determine the volumes of melt produced and thus the pressure and temperature conditions of metal-silicate equilibration, after each impact, as Earth-like planets accrete. For these calculations a parameterised melting model is used that takes impact velocity, impact angle and the respective masses of the impacting bodies into account. The evolution of metal-silicate equilibration pressures (as defined by evolving magma ocean depths) during Earth’s accretion depends strongly on the lifetime of impact-generated magma oceans compared to the time interval between large impacts. In addition, such results depend on starting parameters in the N-body simulations, such as the number and initial mass of embryos. Thus, there is the potential for combining the results, such as those presented here, with multistage core formation models to better constrain the accretional history of the Earth.
DS1988-0458
1988
Melosh, H.J.Melosh, H.J.Impact cratering: a geologic processOxford University of Press, 272p. $ 65.00GlobalCrater, meteorite
DS1995-1230
1995
Melosh, H.J.Melosh, H.J.Impact craters: under the ringed basinsNature, Vol. 373, No. 6510, Jan. 12, p. 104GlobalCraters, Basins
DS1995-1231
1995
Melosh, H.J.Melosh, H.J.Impact craters: under the ringed basinsNature, Vol. 373, No. 6510, Jan. 12, p. 104.MantleImpact, Craters
DS201212-0130
2012
Melosh, H.J.Collins, G.S., Melosh, H.J., Osinski, G.R.The impact-cratering process.Elements, Vol. 8, 1, Feb, pp. 25-30.MantleCrater collapse, chemical change
DS2000-0686
2000
Meloshm H, J.Morgan, J.V., Warner, M.R., Collins, G.S., Meloshm H, J.Peak ring formation in large impact craters: geophysical constraints from Chicxulub.Earth and Planetary Science Letters, Vol.183, No.3-4, pp. 347-54.CaliforniaImpact craters, Structure - ring dikes
DS1985-0437
1985
Meloux, J.Meloux, J.The economic aspects of the anorogenic alkaline complexes of the world and their associated carbonatites.(in French)Chron. Recherche Miniere*(in French)., No. 481, December pp. 39-46GlobalAlkaline Rocks
DS1960-1221
1969
Melson, W.G.Switzer, G., Melson, W.G.Partially Melted Kyanite Eclogite from the Roberts Victor Mine, South africa.Smithsonian Contributions to Earth Science, Vol. 1, PP. 1-9.South AfricaPetrography
DS1997-0762
1997
Melson, W.G.Melson, W.G., et al.Diamonds to diamonds.... Smithsonian's new geology...Geotimes, Dec. pp. 16-20.GlobalNews item, Gem display
DS1970-0915
1974
Melton, C.E.Giardini, A.A., Hurst, V.J., Melton, C.E., Stormer, J.C.Jr.Biotite As a Primary Inclusion in Diamond: its Nature and Significance.American Mineralogist., Vol. 59, PP. 783-789.United States, Gulf Coast, Arkansas, Pennsylvania, South AfricaMineral Chemistry
DS1970-0959
1974
Melton, C.E.Melton, C.E., Giardini, A.A.The Composition and Significance of Gas Released from Natural Diamonds from Africa and Brasil.American MINERALOGIST., Vol. 59, No. 7-8, PP. 775-782.South Africa, BrazilMineralogy, Diamond Genesis
DS1975-0081
1975
Melton, C.E.Giardini, A.A., Melton, C.E.Chemical Dat a on a Colorless Arkansaw Diamond and its Black amorphous C Iron Nickel S Inclusion.American Mineralogist., Vol. 60, PP. 934-936.United States, Gulf Coast, Arkansas, PennsylvaniaMineral Chemistry, Age Of Diamonds
DS1975-0082
1975
Melton, C.E.Giardini, A.A., Melton, C.E.The Nature of Cloud Like Inclusions in Two Arkansaw DiamondsAmerican Mineralogist., Vol. 60, PP. 932-933.United States, Gulf Coast, Arkansas, PennsylvaniaMineralogy
DS1975-0135
1975
Melton, C.E.Melton, C.E., Giardini, A.A.Experimental Results and a Theoretical Interpretation of Gaseous Inclusions Found in Arkansaw Natural Diamonds.American Mineralogist., Vol. 60, PP. 413-417.United States, Gulf Coast, Arkansas, PennsylvaniaMineral Chemistry
DS1975-0588
1977
Melton, C.E.Newton, M.G., Melton, C.E., Giardini, A.A.Mineral Inclusion in an Arkansaw DiamondAmerican Mineralogist., Vol. 62, No. 5-6, PP. 583-586.United States, Gulf Coast, Arkansas, PennsylvaniaMineralogy, Murfreesboro
DS1975-0750
1978
Melton, C.E.Gogineni, S.V., Melton, C.E., Giardini, A.A.Some Petrological Aspects of the Prairie Creek Diamond Bearing Kimberlite Diatreme, Arkansaw.Contributions to Mineralogy and Petrology, Vol. 66, No. 3, PP. 251-262.United States, Gulf Coast, Arkansas, PennsylvaniaPetrology, Lamproite
DS1975-1172
1979
Melton, C.E.Pantaleo, N.S., Newton, G.S., Gogineni, S.V., Melton, C.E.Mineral Inclusions in Four Arkansaw Diamonds: Their Nature And Significance.American Mineralogist., Vol. 64, No. 9-10, PP. 1059-1062.United States, Gulf Coast, Arkansas, PennsylvaniaMineralogy, Mineral Chemistry
DS1980-0233
1980
Melton, C.E.Melton, C.E., Giardini, A.A.The Isotopic Composition of Argon Included in an Arkansaw Diamond and its Significance.Geophysical Research. LETTERS, Vol. 7, No. 6, PP. 461-464.United States, Gulf Coast, Arkansas, PennsylvaniaIsotope, Inclusion, Mineral Chemistry
DS1981-0298
1981
Melton, C.E.Melton, C.E., Giardini, A.A.The Nature and Significance of Occluded Fluids in Three Indian Diamonds.American Mineralogist., Vol. 66, No. 7-8, JULY-AUGUST PP. 746-750.India, PannaMineral Chemistry
DS1982-0429
1982
Melton, C.E.Melton, C.E., Giardini, A.A.The Evolution of the Earth's Atmosphere and OceansGeophysical Research Letters, Vol. 9, No. 5, May pp. 579-82.ArkansasDiamonds
DS1987-0464
1987
Melton, C.E.Melton, C.E., Giardini, A.A.A model to explain the earth's magnetic field and othergeodynamicphenomenaJournal of Petroleum Geology, Vol. 10, No. 4, October pp. 441-452GlobalGeophysics
DS201212-0462
2012
Melton, G.Melton, G., Stachel, T., Stern, R., Harris, J., Carlson, J.The micro and macrodiamond relationship at the PAnd a kimberlite (Ekati mine) Canada.GEM 2012, PPT. 19p.Canada, Northwest TerritoriesMicrodiamonds
DS201212-0463
2012
Melton, G.L.Melton, G.L., McNeill, J., Stachel, T., Pearson, D.G., Harris, J.W.Trace elements in gem diamond from Akwatia, Ghana and De Beers Pool, South Africa.Chemical Geology, Vol. 314-317, pp. 1-8.Africa, South Africa, GhanaDeposit - Akwatia, DeBeers Pool - Inclusions
DS201312-0597
2013
Melton, G.L.Melton, G.L.Elemental impurities, defects and carbon isotopes in mantle diamond.Thesis, University of Alberta, Earth and Atmospheric Sciences, 168p. Pdf copy availableAfrica, South Africa, GhanaDeposit - Akwatia, De Beers Pool
DS201312-0598
2013
Melton, G.L.Melton, G.L., Stachel, T., Stern, R.A., Carlson, J., Harris, J.W.Micro and macro diamond characteristics from the PAnd a kimberlite.Geoscience Forum 40 NWT, abstract only p. 29Canada, Northwest TerritoriesDeposit - Panda
DS201312-0599
2013
Melton, G.L.Melton, G.L., Stachel, T., Stern, R.A., Carlson, J., Harris, J.W.Infrared spectral and carbon isotopic characteristics of micro- and macro diamonds from the PAnd a kimberlite, Central Slave Craton, Canada).Lithos, Vol. 177, pp. 110-119.Canada, Northwest TerritoriesDeposit - Panda
DS200812-0661
2008
Meltzer, A.S.Li,C., Vander Hilst, R., Meltzer, A.S., Engdahl, E.R.Subduction of the Indian lithosphere beneath the Tibetan Plateau and Burma.Earth and Planetary Science Letters, Vol. 274, 1-2, pp. 157-168.Asia, Tibet, MyanmarSubduction
DS1900-0784
1909
Melvill, E.H.V.Melvill, E.H.V.Note on the Roberts Victor MineGeological Society of South Africa Transactions, Vol. 12, PP. 205-212.Africa, South AfricaGeology, Kimberlite Mines And Deposits
DS1988-0212
1988
Melville, D.M.Ferri, F., Melville, D.M.Manson Creek Mapping project. 93N 09British Columbia Department of Mines, Geological Fieldwork 1987, Paper 1988-1, pp. 169-180British ColumbiaCarbonatite at Granite Creek and southeast of Treb Cre
DS1998-0034
1998
Melzer, S.Andronikov, A.V., Foley, S.F., Melzer, S.Mantle xenoliths from the Jetty Peninsula area: samples of thermallyeroding lithosphere Lambert-Amery Rift.7th International Kimberlite Conference Abstract, pp. 20-22.AntarcticaTectonics, Magmatism - lherzolite
DS2002-0470
2002
Melzer, S.Foley, S.F., Andronikov, A.V., Melzer, S.Petrology of ultramafic lamprophyres from the Beaver Lake area: their relation to breakup of Gondwanaland.Mineralogy and Petrology, Vol. 74, 2-4, pp. 361-84.eastern AntarcticaLamprophyres, Tectonics
DS2003-1503
2003
Melzer, S.Wunder, B., Melzer, S.Experimental evidence on phlogopitic mantle metasomatism induced by phengiteEuropean Journal of Mineralogy, Vol. 15, 4, pp. 641-48.MantleMetasomatism
DS200612-0403
2006
Melzer, S.Foley, S.F., Andronikov, A.V., Jacob, D.E., Melzer, S.Evidence from Antarctic mantle peridotite xenoliths for changes in mineralogy, geochemistry and geothermal gradients beneath a developing rift.Geochimica et Cosmochimica Acta, Vol. 70, 12, June pp. 3096-3120.AntarcticaGeothermometry
DS2001-0771
2001
Memady, E.G.Memady, E.G.Mauritania throws down a challenge.... government welcomes companies.Mining Annual Review, 1p.MauritaniaCountry - overview, economics, mining, Overview - brief
DS200612-0906
2006
Membrane TechnologyMembrane TechnologyMembranes produce water for diamond mine.Membrane Technology, Elsevier ingentaconnect 1060783393, Vol. 1, p.2.TechnologyMining
DS1994-1166
1994
Memi, J.M.Memi, J.M., Pride, D.E.Local sources for historic diamond finds in WisconsinGeological Society of America Abstracts, Vol. 26, No. 5, April p. 54. Abstract.WisconsinHistory, Diamonds
DS1997-0763
1997
Memi, J.M.Memi, J.M., Pride, D.E.The application of diamond exploration geoscientific information system(DEGRIS) technology.....International Journal of Remote Sensing, Vol. 18, No. 7, May 10, pp. 1439-64.MidcontinentRemote sensing
DS1983-0447
1983
Memmi, J.M.Memmi, J.M., Mccallum, M.E., Hausel, W.D.Preliminary Results of Resistivity Investigations of Colorado Wyoming Kimberlite Diatremes.Geological Society of America (GSA), Vol. 15, No. 5, P. 317. (abstract.).United States, Colorado, Wyoming, State Line, Rocky MountainsGeophysics, Kimberlite
DS1989-1004
1989
Memmi, J.M.Memmi, J.M.Enhancement modeling of geophysical dat a for kimberlite exploration in Colorado and WyomingMsc. Thesis, Colorado State University, Fort Collins, Colorado, WyomingGeophysics, Kimberlite
DS1991-1124
1991
Memmi, J.M.Memmi, J.M., McCallum, M.E.Finite element modeling of resistivity dat a from kimberlites inColorado-Wyoming, USAProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 276-278Colorado, WyomingGeophysics -resistivity
DS1991-1125
1991
Memmi, J.M.Memmi, J.M., McCallum, M.E.Enhancement of geophysical dat a for kimberlite exploration at IronMountain, Wyoming, USAProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 273-275WyomingGeophysics-magnetics, Conductivity
DS1993-1017
1993
Memmi, J.M.Memmi, J.M.Integrated approach to diamond exploration in the north-central UnitedStates.Ph.d. Thesis Ohio State University, Columbus Ohio, 244p.Michigan, Minnesota, North Dakota, Iowa, Ontario, WisconsinDiamond exploration techniques
DS1993-1018
1993
Memmi, J.M.Memmi, J.M., Pride, D.E.An integrated approach to diamond exploration in the north-central UnitedStates.Preprint from Poster session, Denver SEG Integrated Exploration Meeting, 2p.WisconsinBrief overview, DEGIS
DS1994-1167
1994
Memmi, J.M.Memmi, J.M., McCallum, M.E.Finite element modeling of resistivity dat a from kimberlite intrusions inWyoming, USAProceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 382-388.Wyoming, United StatesGeophysics -resistivity
DS1996-0942
1996
Memmi, J.M.Memmi, J.M.Expertise and GIS converge for diamond explorationGis World Inc., February pp. 54-57.GlobalComputer, Program -DEGIS
DS1997-0926
1997
Memmi, J.M.Pride, D.E., Memmi, J.M., Loomis, J., Yagel, R.SEARCHMAP - interactive map interpretation system for mineral explorationExplore., No. 95, April pp. 1, 3-10MidcontinentComputer - GIS, Remote sensing, GIS datasets
DS1997-0927
1997
Memmi, J.M.Pride, D.E., Memmi, J.M., Loomis, J., Yagel, R.SEARCHMAP - interactive map exploration system for mineral exploration.Specific application for diamonds.Explore, No. 95, April pp. 1, 3-10.MidcontinentGIS, Map information data
DS1860-0372
1882
MemorandumMemorandumGriqualand West Legislation. Memorandum on Certain Proposed amendments of the Mining Ordinance.Cape Town: Saul Solomon., 31P.Africa, South AfricaLegal
DS1900-0738
1909
MemphisMemphisStatus of Diamond Fields of Pike County, ArkansasMemphis, Tenn.:commercial Appeal, MARCH 21ST.United States, Gulf Coast, Arkansas, PennsylvaniaEconomics
DS1993-1676
1993
Mena, M.Vizan, H., Mena, M., Vilas, J.F.Pangea, the geoid, and the paths of virtual geomagnetic poles during polarity reversalsJournal of South American Earth Sciences, Vol. 6, No. 4, November pp. 253-266PangeaPaleomagnetism
DS1986-0829
1986
Menaar, L.F.Van Wyk, J.P., Menaar, L.F.Diamondiferous gravels of the lower Orange River, NamaqualandIn: Mineral deposits of Southern Africa, Vol. 2, pp. 2309-2322South AfricaPlacers
DS200812-0080
2008
Menagh, T.P.Barron, L.M., Barron, B.J., Menagh, T.P., Birch, W.D.Ultrahigh pressure macro diamonds from Copeton ( New South Wales, Australia) based on Raman spectroscopy of inclusions.Preprint from Author, 23p.Australia, New South WalesMacrodiamonds
DS200612-0670
2006
Menand, T.Kavanagh, J.L., Menand, T., Sparks, R.S.J.An experimental investigation of sill formation and propogation in layered elastic media.Emplacement Workshop held September, 1p. abstractGlobalDynamics - sill intrusion
DS200812-0739
2008
Menand, T.Menand, T.The mechanics and dynamics of sills in layered elastic rocks and their implications for the growth of laccoliths and other igneous complexes.Earth and Planetary Science Letters, Vol. 267, 1-2, pp. 93-99.TechnologyVolcanology - sills
DS201012-0494
2010
Menand, T.Menand, T., Daniels, K.A., Benghiat, P.Dyke propagation and sill formation in a compressive tectonic environment.Journal of Geophysical Research, Vol. 115, B08201 ( 12p.)MantleDikes, sills emplacement
DS201112-0664
2011
Menand, T.Menand, T.Physical controls and depth of emplacement of igneous bodies: a review.Tectonophysics, Vol. 500, 1-4, pp. 11-19.MantleMagmatism
DS1989-1437
1989
Menard, T.Spear, F.S., Menard, T.Program GIBBS: a generalized Gibbs method algorithMAmerican Mineralogist, Vol. 74, No. 7 and 8, July-August pp. 942-943GlobalComputer, Program - GIBBS
DS1991-1645
1991
Menard, T.Spear, F.S., Peacock, S.M., Kohn, M.J., Florence, F.P., Menard, T.Computer programs for petrologic P-T-t path calculationsAmerican Mineralogist, Vol. 76, No. 11, 12 November-December pp. 2009-2012GlobalComputer, Program -petrologic P-T-t
DS200912-0493
2009
Menard, T.Menard, T.Physical controls and depth of emplacement of igneous bodies: a review.Tectonophysics, in press available non-format 40p.Tectonics
DS2002-1379
2002
MenchettiSafonov, O.G., Malveev, Yu.A., Litvin, Y.A., Perchuk, L.L., Bindi, L., MenchettiUltrahigh pressure study of potassium bearing clinopyroxene equilibria18th. International Mineralogical Association Sept. 1-6, Edinburgh, abstract p.74.Russia, YakutiaUHP, mineralogy, Kokchteav Complex, kimberlites
DS2002-0157
2002
Menchetti, S.Bindi, L., Safonov, O.G., Litvin, Y.A., Perchuk, L.L., Menchetti, S.Ultrahigh potassium content in the clinopyroxene structure: an x-ray single crystal studyEuropean Journal of Mineralogy, Vol. 14, 5, pp. 929-34.GlobalMineralogy - not specific to diamond
DS2003-0111
2003
Menchetti, S.Bindi, L., Safonov, O.G., Yapaskurt, V.O., Perchuk, L.L., Menchetti, S.Ultrapotassic clinopyroxene from the Kumdy Kol microdiamond mine, KokchetavAmerican Mineralogist, Vol. 88, 2-3, Feb.March pp. 464-8.Russia, KazakhstanMineral chemistry, Kokchetav Complex
DS1991-1142
1991
Mendelsshon, M.J.Meyer, H.O.A., Zhang Andi, Milledge, H.J, Mendelsshon, M.J., SealComprehensive investigations of Chinese diamondsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 285-286ChinaDiamond inclusions, Shandong, microspectroscopy, Cathodluminesence, Liaoning, analyses
DS1989-1023
1989
Mendelssohn, J.J.Milledge, H.J., Mendelssohn, J.J., Boyd, S.R., Pillenger, C.T.Infrared topography and carbon and nitrogen isotope distribution in natural and synthetic diamonds in relation to mantle processesDiamond Workshop, International Geological Congress, July 15-16th. editors, pp. 55-60. AbstractGlobalMantle, Diamond morphology, natur
DS1970-0353
1971
Mendelssohn, M.J.Mendelssohn, M.J.The Etching of Diamond and of the Associated Minerals Garnet and Olivine.Ph.d. Thesis, University of London., South AfricaDiamond Crystallography
DS1983-0456
1983
Mendelssohn, M.J.Milledge, H.J., Mendelssohn, M.J., Seal, M., et al.Carbon Isotopic Variation in Spectral Type Ii DiamondsNature., Vol. 303, No. 5920, JUNE 30TH. PP. 791-792.GlobalMorphology, Crystallography
DS1989-0289
1989
Mendelssohn, M.J.Cooper, G.I., Mendelssohn, M.J., Milledge, H.J.High pressure/temperature experiments with natural diamondDiamond Workshop, International Geological Congress, July 15-16th., pp. 14-17. AbstractGlobalDiamond morphology -natural, Natural diamond
DS1991-1126
1991
Mendelssohn, M.J.Mendelssohn, M.J., Milledge, H.J., Cooper, G.I., Meyer, H.O.A.Infrared micro spectroscopy of diamond in relation to mantle processesProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 279-280BrazilExperimental spectroscopy, Geothermometry
DS1991-1156
1991
Mendelssohn, M.J.Milledge, H.J., Mendelssohn, M.J., Meyer, H.O.A.Infrared and cathodluminesence studies of inclusion- bearing diamonds fromBrasilProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 290-291BrazilDiamantina, Diamond inclusions
DS1994-1183
1994
Mendelssohn, M.J.Meyer, H.O.A., Zhang Ani, Milledge, H.J., Mendelssohn, M.J.Diamonds and mineral inclusions in diamonds from Shandong and LianongProvinces, China.Proceedings of Fifth International Kimberlite Conference, Vol. 2, pp. 98-105.ChinaDiamond morphology
DS1995-1232
1995
Mendelssohn, M.J.Mendelssohn, M.J., Milledge, H.J.Morphological characteristics of diamond populations in relation to temperature dependent growth and diss ratesInternational Geology Review, Vol. 37, No. 4, April pp. 285-312.GlobalDiamond morphology, Dissolution rates
DS1995-1233
1995
Mendelssohn, M.J.Mendelssohn, M.J., Milledge, H.J.Recent advances in the interpretation of the mid-infrared absorption spectra of diamond.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 374-376.GlobalMicroscopy -IR microscopes, Petrology -experimental
DS1998-0992
1998
Mendelssohn, M.J.Mendelssohn, M.J., Milledge, H.J.Characterization of diamonds by infrared spectroscopy7th International Kimberlite Conference Abstract, pp. 567-9.GlobalDiamond populations, Spectroscopy - nitrogen aggregation estimates
DS1988-0080
1988
Mendelsson, M.J.Boyd, S.R., Pillinger, C.T., Milledge, H.J., Mendelsson, M.J.Fractionation of nitrogen isotopes in a synthetic diamond of mixed crystal habitNature, Vol. 331, No. 6157, Feb. 18, pp. 604-607GlobalBlank
DS1994-1912
1994
Mendes, J.C.Wiedemann, C., Mendes, J.C., Ludka, I.P.Contamination of mantle magmas by crustal contribution -evidence from the Brasiliano mobile belt.International Symposium Upper Mantle, Aug. 14-19, 1994, Extended abstracts pp. 39-41.Brazil, Rio de JaneiroGeochemistry, Mantle magmas
DS201112-0150
2010
Mendes, J.C.Carolino, J., Newman, J.A., Teixeira Carvalho de Newman, D., Fornaciari, G., Mendes, J.C.Minerais industriais: o casa dos diamantes sinteticos.5th Brasilian Symposium on Diamond Geology, Nov. 6-12, abstract p. 53.South America, BrazilIndustrial - synthetics
DS1991-0343
1991
Mendes, M.H.Davies, G.R., Mendes, M.H.The petrogenesis of metasomatised sub-oceanic mantle beneath Santiago: Cape Verde IslandsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 66-68GlobalPetrology, Mantle
DS200712-0714
2006
Mendez, A.E.Mendez, A.E., Prelas, M.A., Glascock, M., Ghosh, T.K.A novel method for the diffusion of boron in 60-80 micron size natural diamond Type II/A powder.Journal of Materials and Research, No. 929, pp. 155-160 Ingenta 1-64796903TechnologyType II diamonds
DS201910-2284
2019
Mendez-Ramos, J.Menendez, I., Campeny, M., Quevedo-Gonzalez, L., Mangas, J., Llovet, X., Tauler, E., Barron, V., Torrent, J., Mendez-Ramos, J.Distribution of REE-bearing minerals in felsic magmatic rocks and palesols from Gran Canaria, Spain: intraplate oceanic islands as a new example of potential, non-conventional sources of rare earth elements.Journal of Geochemical Exploration, Vol. 204, pp. 270-288.Europe, SpainREE

Abstract: Gran Canaria is a hotspot-derived, intraplate, oceanic island, comprising a variety of alkaline felsic magmatic rocks (i.e. phonolites, trachytes, rhyolites and syenites). These rocks are enriched in rare-earth elements (REE) in relation to the mean concentration in the Earth's crust and they are subsequently mobilised and redistributed in the soil profile. From a set of 57 samples of felsic rocks and 12 samples from three paleosol profiles, we assess the concentration and mobility of REE. In the saprolite that developed over the rhyolites, we identified REE-bearing minerals such as primary monazite-(Ce), as well as secondary phases associated with the edaphic weathering, such as rhabdophane-(Ce) and LREE oxides. The averaged concentration of REE in the alkaline bedrock varies from trachytes (449?mg?kg-1), to rhyolites (588?mg?kg-1) and to phonolites (1036?mg?kg-1). REE are slightly enriched in saprolites developed on trachyte (498?mg?kg-1), rhyolite (601?mg?kg-1) and phonolite (1171?mg?kg-1) bedrocks. However, B-horizons of paleosols from trachytes and phonolites showed REE depletion (436 and 994?mg?kg-1, respectively), whereas a marked enrichment was found in soils developed on rhyolites (1584?mg?kg-1). According to our results, REE resources on Gran Canaria are significant, especially in Miocene alkaline felsic magmatic rocks (declining stage) and their associated paleosols. We estimate a total material volume of approximately 1000?km3 with REE concentrations of 672?±?296?mg?kg-1, yttrium contents of 57?±?30?mg?kg-1, and light and heavy REE ratios (LREE/HREE) of 17?±?6. This mineralisation can be considered as bulk tonnage and low-grade ore REE deposits but it remains necessary to develop detailed mineral exploration on selected insular zones in the future, without undermining environmental and socioeconomic interests.
DS201912-2806
2019
Mendonca, C.A.Mendonca, C.A., Pareshi Soares, W., Cavalante, F.Annihilator transform for magnetic lineaments removal in dike swarms.Geophysics, Vol. 84, 4, pp. 1-47.South America, Brazilgeophysics - magnetics

Abstract: Dike swarms are igneous structures of continental expression accounting for major episodes of magmatism in igneous provinces, mantle plume heads, and continental breakup. In regional magnetic maps, dike swarms are recognized by high-amplitude lineaments indicative of lengthy and juxtaposed magnetized bodies. High-anomaly amplitudes from such tabular (2D) bodies tend to obscure lower amplitude contributions from localized 3D sources, representative of magmatic structures that once served as magma plumbing and storage. The recognition of such subtle signals with conventional filtering techniques is prevented due to spectral overlapping of individual contributions. We have developed a processing scheme to remove contributions from elongated, homogeneous sources to make clear contributions from 3D sources located below, in the middle of, or above a framework of elongated homogeneous sources. The canceling of 2D fields is accomplished by evaluating the horizontal component of the magnetic anomaly along the lineament strike, which for true elongated and homogeneous sources gives a null response. The gradient intensity of the transformed field is then evaluated to enhance residual fields over 3D sources. Lineaments thus removed identify tabular bodies with homogeneous magnetization, interpreted as being indicative of the uniform distribution (mineral type, concentration, and grain-size distribution) of magnetic carrier content in the rock. We evaluated our technique with synthetic data from multiple 2D-3D interfering sources and then applied it to interpret airborne data from the Ponta Grossa Dike Swarm of the Paraná-Etendeka Magmatic Province in Southeastern Brazil.
DS1990-1029
1990
Mendonca Figueiroa, S.F. de.Mendonca Figueiroa, S.F. de.German-Brazilian relations in the field of geological sciences during the19th. centuryEarth Sciences History, Vol. 9, No. 2, pp. 132-137BrazilHistorical aspect of scientists in 19th. century
DS201012-0895
2010
Mendong, S.Zhonghua, S., Taijin, L., Mendong, S., Jun, S., Jing, D., Xihuan, Z.2010 coated and fracture filled coloured diamond.The Australian Gemmologist, Vol. 24, 1,TechnologyDiamond filling
DS1991-1581
1991
Mendoza, V.Sidder, G.B., Mendoza, V.Geology of the Venezuelan Guyanan shield and its relation to the entire Guyana shieldUnited States Geological Survey (USGS) Open File, No. 91-0141, 59p. 2 maps $ 13.00Venezuela, GuyanaGeology, Guyana shield
DS1995-2086
1995
Mendoza, V.Wynn, J.C., Sidder, G.B., Gray, F., Page, N.J., Mendoza, V.Geology and mineral deposits of the Venezuelan Guayana shield... goldUnited States Geological Survey (USGS) Bulletin, No. 2124-A, approx. 150pVenezuela, GuyanaBook -table of contents, Geophysics, Lo Increible, Sierra Verdun, Cerro ArrendaJ.
DS200612-0907
2006
Mendybaev, R.A.Mendybaev, R.A., Richter, F.M., Davis, A.M.Crystallization of melilite from CMAS - liquids and the formation of the melilite mantle of Type B1 CAIs: experimental simulations.Geochimica et Cosmochimica Acta, Vol. 70, 10, May 15, pp. 2622-2642.TechnologyMelilite
DS1982-0430
1982
Menechel, L.Menechel, L.Trial Geochemical Prospecting Over the Kimberlite Pipes of The Kundelungu Plateau, Sheba Province, Zaire.In: Geochemistry in Zambia, D.C. Turner, editor, AGID Report Vol. 9, pp. 77-90ZambiaGeochemistry
DS1982-0431
1982
Meneghel, L.Meneghel, L.Trial geochemical prospecting over the kimberlite pipes ofKundelunguplateau, Shaba Province, ZaireA.g.i.d. Report., No. 9, PP. 77-90.Central Africa, ZaireGeochemistry
DS1994-1884
1994
MeneglWardle, R.J., Bridgewaterm D., Menegl, Cambell, et al.Mapping in the Torngat Orogen, no. 3 the Nain Craton.. ultramafic dyke occurrences in northern most LabradorNewfld. Department of Mines, Report, No. 94-1, pp. 399-407.Quebec, Ungava, LabradorNain Craton
DS201112-0665
2011
Menegon, L.Menegon, L., Nasipuri, P., Stunitz, H., Behrens, H., Ravna, E.Dry and strong quartz during deformation of the lower crust in the presence of melt.Journal of Geophysical Research, Vol. 116, B10, B10410MantleMelting
DS201910-2284
2019
Menendez, I.Menendez, I., Campeny, M., Quevedo-Gonzalez, L., Mangas, J., Llovet, X., Tauler, E., Barron, V., Torrent, J., Mendez-Ramos, J.Distribution of REE-bearing minerals in felsic magmatic rocks and palesols from Gran Canaria, Spain: intraplate oceanic islands as a new example of potential, non-conventional sources of rare earth elements.Journal of Geochemical Exploration, Vol. 204, pp. 270-288.Europe, SpainREE

Abstract: Gran Canaria is a hotspot-derived, intraplate, oceanic island, comprising a variety of alkaline felsic magmatic rocks (i.e. phonolites, trachytes, rhyolites and syenites). These rocks are enriched in rare-earth elements (REE) in relation to the mean concentration in the Earth's crust and they are subsequently mobilised and redistributed in the soil profile. From a set of 57 samples of felsic rocks and 12 samples from three paleosol profiles, we assess the concentration and mobility of REE. In the saprolite that developed over the rhyolites, we identified REE-bearing minerals such as primary monazite-(Ce), as well as secondary phases associated with the edaphic weathering, such as rhabdophane-(Ce) and LREE oxides. The averaged concentration of REE in the alkaline bedrock varies from trachytes (449?mg?kg-1), to rhyolites (588?mg?kg-1) and to phonolites (1036?mg?kg-1). REE are slightly enriched in saprolites developed on trachyte (498?mg?kg-1), rhyolite (601?mg?kg-1) and phonolite (1171?mg?kg-1) bedrocks. However, B-horizons of paleosols from trachytes and phonolites showed REE depletion (436 and 994?mg?kg-1, respectively), whereas a marked enrichment was found in soils developed on rhyolites (1584?mg?kg-1). According to our results, REE resources on Gran Canaria are significant, especially in Miocene alkaline felsic magmatic rocks (declining stage) and their associated paleosols. We estimate a total material volume of approximately 1000?km3 with REE concentrations of 672?±?296?mg?kg-1, yttrium contents of 57?±?30?mg?kg-1, and light and heavy REE ratios (LREE/HREE) of 17?±?6. This mineralisation can be considered as bulk tonnage and low-grade ore REE deposits but it remains necessary to develop detailed mineral exploration on selected insular zones in the future, without undermining environmental and socioeconomic interests.
DS201112-0358
2011
Menendez, M.Gent, M., Menendez, M., Torano, J., Torno, S.A review of indicator minerals and sample processing methods for geochemical exploration. Mentions kimberlitesJournal of Geochemical Exploration, Vol. 110, 2, pp. 47-60.TechnologyIM, density, magnetic
DS1999-0140
1999
Meneses, C.Comte, D., Dorbath, L., Meneses, C.A double layered seismic zone in Africa, northern ChileGeophysical Research Letters, Vol. 26, No. 13, July 1, pp. 1965-8.Africa, ChileGeophysics - seismics
DS200712-0715
2007
Menezes, P.T.L.Menezes, P.T.L., Garcia, M.D.M.Kimberlite exploration at Serra da Canastra province, Brazil.Geophysics, Vol. 72, 3, May-June pp. M1-5.South America, BrazilGeophysics - magnetics
DS201112-0666
2011
Menezes, P.T.L.Menezes, P.T.L., La Terra, E.F.3D magnetic interpretation of the Regis kimberlite pipe, Minas Gerais, Brazil.Near Surface Geophysics, In press,South America, Brazil, Minas GeraisGeophysics - Regis
DS201312-0600
2011
Menezes, P.T.L.Menezes, P.T.L., La Terra, E.F.3 D magnetic interpretation of the Regis kimberlite pipe, Minas Gerais.Near Surface Geophysics, Vol. 9, 4, pp. 331-337.South America, BrazilDeposit - Regis
DS201707-1360
2017
Menezes Betiollo, L.Reis, N.J., Nadeau, S., Fraga, L.M., Menezes Betiollo, L., Telma Lins Faraco, M., Reece, J., Lachhman, D., Ault, R.Stratigraphy of the Roraima Supergroup along the Brazil Guyana border in the Guiana shield, northern Amazonian craton - results of the Brazil Guyana geology and geodiversity mapping project.Brazil Journal of Geology, Vol. 47, 1, pp. 43-57.South America, Brazil, Guyanacraton

Abstract: The Geological and Geodiversity Mapping binational program along the Brazil-Guyana border zone allowed reviewing and in- tegrating the stratigraphy and nomenclature of the Roraima Supergroup along the Pakaraima Sedimentary Block present in northeastern Brazil and western Guyana. The area mapped corresponds to a buffer zone of approximately 25 km in width on both sides of the border, of a region extending along the Maú-Ireng River between Mount Roraima (the tri- ple-border region) and Mutum Village in Brazil and Monkey Mountain in Guyana. The south border of the Roraima basin is overlain exclusively by effusive and volcaniclastic rocks of the Surumu Group of Brazil and its correlated equivalent the Burro-Burro Group of Guyana.
DS201904-0772
2017
Menezes Betiollo, L.Reis, N.J., Nadeau, S., Fraga, L.M., Menezes Betiollo, L., Telma Lins, Faraco, M., Reece, J., Lachhman, D., Ault, R.Stratigraphy of the Roraima Supergroup along the Brazil-Guyana border in the Guiana shield, northern Amazonian craton - results of the Brazil Guyana geology and geodiversity mapping project.Brazilian Journal of Geology, Vol. 41, 1, pp. 43-57.South America, Brazil, GuyanaGuiana shield

Abstract: The Geological and Geodiversity Mapping binational program along the Brazil-Guyana border zone allowed reviewing and integrating the stratigraphy and nomenclature of the Roraima Supergroup along the Pakaraima Sedimentary Block present in northeastern Brazil and western Guyana. The area mapped corresponds to a buffer zone of approximately 25 km in width on both sides of the border, of a region extending along the Maú-Ireng River between Mount Roraima (the triple-border region) and Mutum Village in Brazil and Monkey Mountain in Guyana. The south border of the Roraima basin is overlain exclusively by effusive and volcaniclastic rocks of the Surumu Group of Brazil and its correlated equivalent the Burro-Burro Group of Guyana.
DS201503-0160
2015
Menezes Filho, L.A.D.Menezes Filho, L.A.D., Atencio, D., Andrade, M.B., Downs, R.T., Chaves, M.L.S.C., Romano, A.W., Scholz, R., Persiano, A.I.C.Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, Sao Paulo, Brazil.American Mineralogist, Vol. 100, pp. 442-446.South America, BrazilCarbonatite
DS2000-0652
2000
MengMeng, Q-R, Zhang, G-W.Geologic framework and tectonic evolution of the Qinling orogen, central China.Tectonophysics, Vol. 323, No.3-4, Aug, pp.183-96.ChinaTectonics, Orogeny
DS200512-1201
2005
Meng, D.Wu, X., Meng, D., Han, Y.aPbO2 type nanophase TiO2 from coesite bearing eclogite in the Dabie Mountains, China.American Mineralogist, Vol. 90, July-August pp. 1458-1461.Asia, ChinaUHP - Coesite eclogite
DS200912-0824
2009
Meng, D.Wu, X., Meng, D.Defect microstructure in garnet, omphacite and symplectite from UHP eclogites, eastern Dabie Shan China: a TEM and FTIR study.Mineralogical Magazine, Vol. 72, 5, pp. 1057-1069.ChinaUHP
DS1996-0943
1996
Meng, F.Meng, F., et al.Ore body hunting with crosswell imaging methodsSoc. Exploration Geophysicists, 66th Meeting, Nov, Vol. 1, p. 626-9GlobalGeophysics - seismics
DS200612-1562
2006
meng, F.Yang, J., Wu, C., Zhang, J., Shi, R., meng, F.,Wooden, J., Yang, H-Y.Protolith of eclogites in the north Qaidam and Altun UHP terrane, NW China: earlier oceanic crust?Journal of Asian Earth Sciences, In press, availableChinaUHP, subduction, eclogites
DS201412-0999
2014
Meng, F.Yang, J., Meng, F., Xu, X., Robinson, P.T., Dilek, Y., Makeyev, A.B., Wirth, R., Wiedenbeck, M., Cliff, J.Diamonds, native elements and metal alloys from chromitites of the Ray-Iz ophiolite of the Polar Urals.Gondwana Research, Vol. 27, 2, pp. 459-485.Asia, TibetUHP ophiolite diamonds
DS201502-0126
2014
Meng, F.Yang, J., Meng, F., Xu, X., Robinson, P.T., Dilek, Y., Makeyev, A.B., Wirth, R., Wiedenbeck, M., Cliff, J.Diamonds, native elements and metal alloys from chromitites of the Ray-Iz ophiolite of the Polar Urals.Gondwana Research, Vol. 27, 2, pp. 459-485.Russia, UralsChromitite
DS201612-2321
2016
Meng, F.Meng, F.Rare earth element enrichment in Paleoproterozoic Fengzhen carbonatite from the North Chin a block.International Geology Review, Vol. 58, 15, pp. 1940-1950.ChinaRare earths

Abstract: Carbonatites are characterized by the highest concentration of rare earth elements (REEs) of any igneous rock and are therefore good targets for REE exploration. Supergene, hydrothermal, and magmatic REE deposits associated with carbonatites have been widely studied. REE enrichment related to fluorapatite metasomatism in Fengzhen carbonatites in the North China block is reported in this study. REE minerals (monazite, britholite, and Ca-REE-fluorocarbonates) associated with barite and quartz formed as inclusions within the fluorapatite and externally on its surface. Monazite, allanite, barite, and quartz occur as rim grains on the edges of the fluorapatite. Zoned fluorapatite was observed and showed varying chemical composition. Based on back-scattered electron imaging, the dark domains with mineral inclusions contain lower Si (0.3-0.6 wt.% SiO2) and light REE (LREE) [0.36-1.54 wt.% (Y+LREE)2O3] contents than inclusion-poor areas [0.7-1 wt.% SiO2; 2.16-4.51 wt.% (Y + LREE)2O3]. This indicates a dissolution-re-precipitation texture. Different types of monazites were distinguished by their chemical compositions. Monazite inclusions have lower La2O3contents (~13 wt.%) and La/Ndcn (~3) ratios than those (18-26 wt.% and 10-14 for La2O3 and La/Ndcn, respectively) growing externally on the fluorapatite. REE enrichment in the metasomatic fluorapatites is related to different stages of carbonatitic liquids. The early carbonatite-exsolved fluids metasomatized the fluorapatites to form REE mineral inclusions. The late carbonatitic fluids from carbonatite magmas that underwent strong fractional crystallization were enriched in REEs, Al, and Fe and metasomatized the fluorapatites to produce allanite and monazite rim grains.
DS200512-1243
2005
Meng, F.C.Zhang, J.X., Yang, J.S., Mattison, C.G., Xu, Z.Q., Meng, F.C., Shi, R.D.Two contrasting eclogite cooling histories, north Qaidam HP/UHP terrane, western China: petrological and isotopic constraints.Lithos, Vol. 84, 1-2, Sept. pp. 51-76.ChinaEclogite, UHP, geochronology
DS201012-0890
2010
Meng, F.C.Zhang, J.X., Mattinson, C.G., Yu, S.Y., Li, J.P., Meng, F.C.U-Pb zircon geochronology of coesite bearing eclogites from the southern Dulan areas of the North Qaidam UHP terrane, northwestern China: spatially and temporallyJournal of Metamorphic Geology, Vol. 28, 9, pp. 955-978.ChinaUHP - subduction
DS201601-0051
2015
Meng, F.C.Yang, J.S., Wirth, R., Wiedenbeck, M., Griffin, W.L., Meng, F.C., Chen, S.Y., Bai, W.J., Xu, X.X., Makeeyev, A.B., Bryanchaniniova, N.I.Diamonds and highly reduced minerals from chromitite of the Ray-Iz ophiolite of the Polar Urals: deep origin of podiform chromitites and ophiolitic diamonds.Acta Geologica Sinica, Vol. 89, 2, p. 107.Russia, Polar UralsOphiolite
DS201312-0995
2013
Meng, G.S.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
DS201711-2537
2017
Meng, H.Zhu, R., Zhang, H., Zhu, G., Meng, H., Fan, H., Yang, J., Wu, F., Zhang, Z.Craton destruction and related resources.International Journal of Earth Sciences, Vol. 106, 7, pp. 2233-2257.Chinacraton

Abstract: Craton destruction is a dynamic event that plays an important role in Earth’s evolution. Based on comprehensive observations of many studies on the North China Craton (NCC) and correlations with the evolution histories of other cratons around the world, craton destruction has be defined as a geological process that results in the total loss of craton stability due to changes in the physical and chemical properties of the involved craton. The mechanisms responsible for craton destruction would be as the follows: (1) oceanic plate subduction; (2) rollback and retreat of a subducting oceanic plate; (3) stagnation and dehydration of a subducting plate in the mantle transition zone; (4) melting of the mantle above the mantle transition zone caused by dehydration of a stagnant slab; (5) non-steady flow in the upper mantle induced by melting, and/or (6) changes in the nature of the lithospheric mantle and consequent craton destruction caused by non-steady flow. Oceanic plate subduction itself does not result in craton destruction. For the NCC, it is documented that westward subduction of the paleo-Pacific plate should have initiated at the transition from the Middle-to-Late Jurassic, and resulted in the change of tectonic regime of eastern China. We propose that subduction, rollback and retreat of oceanic plates and dehydration of stagnant slabs are the main dynamic factors responsible for both craton destruction and concentration of mineral deposits, such as gold, in the overriding continental plate. Based on global distribution of gold deposits, we suggest that convergent plate margins are the most important setting for large gold concentrations. Therefore, decratonic gold deposits appear to occur preferentially in regions with oceanic subduction and overlying continental lithospheric destruction/modification/growth.
DS200512-1237
2004
Meng, Q.Zhai, M., Meng, Q., Liu, J.Geological features of Mesozoic tectonic regime inversion in eastern North Chin a and implication for geodynamics.Earth Science Frontiers, Vol. 11, 4, pp. 285-298. Ingenta 1045384779ChinaTectonics
DS200812-0207
2008
Meng, Q.Chen, D., Meng, Q., Ni, T., Zhi, X.Re Os and Lu Hf isotope evidence for the genesis of pyroxenite from northern Dabie ultrahigh pressure complex belt, eastern central China.Goldschmidt Conference 2008, Abstract p.A154.ChinaDabie Orogen, UHP
DS200812-1308
2007
Meng, Q.R.Zhai, M-G., Windley, B.F., Kusky, T.M., Meng, Q.R.Mesozoic sub-continental lithospheric thinning under eastern Asia.New books, Tables of contents and costsAsiaNorth China Craton
DS202002-0207
2019
Meng, T.Meng, T., Katz, R.F., Rees Jones, D.W.Devolatization of subducting slabs: Part 1: By thermodynamic parameterization and open system effects. ( carbon transport)Geochemistry, Geophysics, Geosystems, Vol. 20, 1, pp. 5667-5690.Mantlesubduction

Abstract: The amount of H2O and CO2 that is carried into deep mantle by subduction beyond subarc depths is of fundamental importance to the deep volatile cycle but remains debated. Given the large uncertainties surrounding the spatio-temporal pattern of fluid flow and the equilibrium state within subducting slabs, a model of H2O and CO2 transport in slabs should be balanced between model simplicity and capability. We construct such a model in a two-part contribution. In this Part I of our contribution, thermodynamic parameterization is performed for the devolatilization of representative subducting materials—sediments, basalts, gabbros, peridotites. The parameterization avoids reproducing the details of specific devolatilization reactions, but instead captures the overall behaviors of coupled (de)hydration and (de)carbonation. Two general, leading-order features of devolatilization are captured: (1) the released volatiles are H2O-rich near the onset of devolatilization; (2) increase of the ratio of bulk CO2 over H2O inhibits overall devolatilization and thus lessens decarbonation. These two features play an important role in simulation of volatile fractionation and infiltration in thermodynamically open systems. When constructing the reactive fluid flow model of slab H2O and CO2 transport in the companion paper Part II, this parameterization can be incorporated to efficiently account for the open-system effects of H2O and CO2 transport.
DS2003-0937
2003
Meng, Y.Meng, Y., Newville, M., Sutton, S., Rakovan, J., Mao, H-K.Fe and Ni impurities in synthetic diamondAmerican Mineralogist, Vol. 88, 10, Oct. pp. 1555-69.GlobalDiamond - synthesis
DS200412-1297
2003
Meng, Y.Meng, Y., Newville, M., Sutton, S., Rakovan, J., Mao, H-K.Fe and Ni impurities in synthetic diamond.American Mineralogist, Vol. 88, 10, Oct. pp. 1555-69.TechnologyDiamond - synthesis
DS200612-0863
2006
Meng, Y.Mao, W.L., Mao, H-K., Sturhahn, W., Zhao, J., Prakapenka, V.B., Meng, Y., Shu, J., Hemley, R.J.Iron rich post perovskite and the origin of ultralow-velocity zones.Science, Vol. 312, April 28, pp. 564-565.MantleGeophysics - seismics, silicate
DS200812-0642
2008
Meng, Y.Lee, S.K., Lin, J.F., Cai, Y.Q., Hiraoka, N., Eng, P.J., Okuchi, T., Mao, H., Meng, Y., Hu, M.Y.,Chow, P.X ray Raman scattering study of MgSi)3 glass at high pressure: implication for triclustered MgSiO3 melt in Earth's mantle.Proceedings of National Academy of Sciences USA, Vol. 105, 23, June 10, pp. 7925-7929.MantleMelting
DS201312-0539
2013
Meng, Y.Liang, Q., Meng, Y., Yan, C., Krasnicki, S., Lai, J., Hemawan, K., Shu,H., Popov, D., Yu,T., Yang, W., Mao, H., Hemley, R.Developments in synthesis, characterization, and application of large high-quality CVD single crystal diamond.Journal of Superhard Materials, Vol. 35, 4, pp. 195-213.TechnologyDiamond synthetics
DS201412-1024
2014
Meng, Y.Zhang, L., Meng, Y., Yang, W.,Wang, L., Mao, W.L., Zeng, Q-S., Jeong, J.S., Wagner, A.J., Mkhoyan, K.A., Liu, W., Xu, R., Mao, H-K.Disproportionation of (Mg,Fe) SiO3 perovskite in Earth's deep lower mantle.Science, Vol. 344, no. 6186, pp. 877-882.MantlePerovskite
DS201603-0368
2015
Meng, Y.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.
DS201709-2021
2017
Meng, Y.Li, J., Xhu, F., Dong, J., Liu, J., LaI, X., Chen, B., Meng, Y.Experimental investigations into the fate of subducted carbonates and origin of super deep diamonds.Goldschmidt Conference, abstract 1p.Mantlepetrology

Abstract: Carbonates are common rock-forming minerals in the Earth’s crust and act as sinks of atmospheric carbon dioxide. Subduction of hydrothermally altered oceanic lithosphere returns carbon to the interior, where more than three quarters of Earth’s carbon is stored. The contribution of subducted carbonates to the Earth's long-term deep carbon cycle is uncertain and has recently emerged as a topic of intense debate [1]. Moreover, mantle-slab interaction has been proposed as a mechanism to produce super-deep diamonds, thus questioning the use of certain mineral inclusions to infer lower-mantle origin [2]. Here we report new data on the chemical stability and reaction kinetics of carbonates in the mantle from multianvil and diamond-anvil-cell experiments. Our results suggest that carbon can be sequestered into deep Earth through reaction freezing and that the index minerals for super-deep diamonds are not reliable indicators for their formation depths.
DS201904-0805
2019
Meng, Y.Zhu, F., Li, J., Liu, J., Lai, X., Chen, B., Meng, Y.Kinetic control on the depth of superdeep diamonds.Geophysical Research Letters, Vol. 46, 4, pp. 1984-1992.Mantlediamond genesis

Abstract: Superdeep diamonds originate from great depths inside Earth, carrying samples from inaccessible mantle to the surface. The reaction between carbonate and iron may be an important mechanism to form diamond through interactions between subducting slabs and surrounding mantle. Interestingly, most superdeep diamonds formed in two narrow zones, at 250-450 and 600-800 km depths within the ~2,700-km-deep mantle. No satisfactory hypothesis explains these preferred depths of diamond formation. We measured the rate of a diamond forming reaction between magnesite and iron. Our data show that high temperature promotes the reaction, while high pressure does the opposite. Particularly, the reaction slows down drastically at about 475(±55) km depth, which may explain the rarity of diamond formation below 450 km depth. The only exception is the second zone at 600-800 km, where carbonate accumulates and warms up due to the stagnation of subducting slabs at the top of lower mantle, providing more reactants and higher temperature for diamond formation. Our study demonstrates that the depth distribution of superdeep diamonds may be controlled by reaction rates.
DS201912-2799
2019
Meng, Y.Liu, J., Hu, Q., Bi, W., Yang, L., Xiao, Y., Chow, P., Meng, Y., Prakapenka, V.B., Mao, H-K., Mao, W.L.Altered chemistry of oxygen and iron under deep Earth conditionsNature Communications, 8p. PdfMantlegeochemistry

Abstract: A drastically altered chemistry was recently discovered in the Fe-O-H system under deep Earth conditions, involving the formation of iron superoxide (FeO2Hx with x?=?0 to 1), but the puzzling crystal chemistry of this system at high pressures is largely unknown. Here we present evidence that despite the high O/Fe ratio in FeO2Hx, iron remains in the ferrous, spin-paired and non-magnetic state at 60-133?GPa, while the presence of hydrogen has minimal effects on the valence of iron. The reduced iron is accompanied by oxidized oxygen due to oxygen-oxygen interactions. The valence of oxygen is not -2 as in all other major mantle minerals, instead it varies around -1. This result indicates that like iron, oxygen may have multiple valence states in our planet’s interior. Our study suggests a possible change in the chemical paradigm of how oxygen, iron, and hydrogen behave under deep Earth conditions.
DS200612-1580
2006
Meng, Y-f.Yuan, J.C.C., Peng, M-S., Meng, Y-f.Investigation by synchrotron X ray diffraction topography of the crystal structure defects in colored diamonds ( natural, synthetic and treated).GIA Gemological Research Conference abstract volume, Held August 26-27, p. 24. 1/2p.TechnologyX-ray diffraction
DS1990-0427
1990
Meng QingrunDrew, L.J., Meng QingrunGeologic map of the Bayan Obo area, Inner Mongolia, ChinaUnited States Geological Survey (USGS) M.I. Map, No. 2057, 1: 50, 000 $ 3.10ChinaCarbonatite, Bayan Obo
DS1990-0428
1990
Meng QingrunDrew, L.J., Meng Qingrun, Sun WiejunThe Bayan Obo iron-rare-earth-niobium deposits, Inner Mongolia, ChinaLithos, Special Issue, Vol. 25, No. 4, pp. 43-66ChinaRare earths, Carbonatite
DS1986-0560
1986
Menge, G.F.W.Menge, G.F.W.Sodalite carbonatite deposits of Swartbooisdrif,SouthwestAfrica/NamibiaIn: Mineral Deposits of Southern Africa, Vol. 2, pp. 2261-2268Southwest Africa, NamibiaCarbonatite
DS1991-1127
1991
Mengel, F.Mengel, F., Rivers, T.Decompressiong reactions and P=T conditions in high grade rocks, northernLabrador; P-T paths individual samples and implications for early Prot. tectonicevolJournal of Petrology, Vol. 32, No. 1, February pp. 139-168Quebec, Labrador, UngavaMetamorphism, Proterozoic tectonics
DS1991-1128
1991
Mengel, F.Mengel, F., Rivers, T., reynolds, P.Lithotectonic elements and tectonic evolution of Torngat Orogen, SaglekFiord, northern Labrador.Canadian Journal of Earth Sciences, Vol. 28, pp. 1407-23.Labrador, Ungava, QuebecCraton, Tectonics
DS1999-0797
1999
Mengel, F.C.Willigers, B.J.A., Mengel, F.C., Bridgewater, WijbransMafic dike swarms as absolute time markers in high grade terranes: 40Ar39Ar geochronological constraintsGeology, Vol. 27, No. 9, Sept. pp. 775-8.GreenlandKangamiut dikes, Geochronology
DS2000-0172
2000
Mengel, F.C.Connelly, J.N., Van Gool, J.A.M., Mengel, F.C.Temporal evolution of a deeply eroded orogen: the Nagssugtoqidian OrogenCanadian Journal of Earth Sciences, Vol. 37, No. 8, Aug. pp. 1121-42.GreenlandCraton - North Atlantic, Geochronology
DS2002-1642
2002
Mengel, F.C.Van Gool, J.A.M., Connelly, J.N., Marker, M., Mengel, F.C.The Nagssugtoqidian Orogen of West Greenland: tectonic evolution and regional correlations from a West Greenland perspective.Canadian Journal of Earth Science, Vol.39,5, May, pp.665-86.GreenlandTectonics - Orogen, ESCOOT
DS1984-0762
1984
Mengel, K.Wedepohl, K.H., Mengel, K., Oehm, J.Depleted Mantle Rocks and Metasomatically Altered Peridotite Inclusions in Tertiary Basalts from the Hessian Depression northwest Germany.Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 190-201.GermanyRelated Rocks, Mineral Composition
DS1986-0561
1986
Mengel, K.Mengel, K., Green, D.H.Experimental study of amphibole and phlogopite stability in metasomatized peridoite under water saturated and water undersaturated conditionsProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 193-195GlobalExperimental petrology
DS1989-1005
1989
Mengel, K.Mengel, K., Green, D.H.Stability of amphibole and phlogopite in metasomatized peridotite underwater-saturated and water-undersaturated conditionsGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 1, pp. 571-581GlobalMantle Metasomatism, Experimental petrology
DS1991-1129
1991
Mengel, K.Mengel, K., Sachs, P.M., Stosch, H.G., Worner, G., Loock, G.Crustal xenoliths from Cenozoic volcanic fields of West Germany:implications for structure and composition of the continental crustTectonophysics, Vol. 195, No. 2-4, pp. 271-290GermanyXenoliths, Crust
DS1999-0634
1999
Mengel, K.Schmidt, K.H., Bottazi, P., Mengel, K.Trace element partitioning between phlogopite, clinopyroxenes and leucite lamproite melt.Earth and Planetary Science Letters, Vol. 168, No. 3-4, May 15, pp. 287-300.GlobalGeochemistry, Lamproite
DS200412-1664
2004
Menguy, N.Ricolleau, A., Perrillat, J.P., Fiquet, G., Menguy, N., Daniel, I., Addad, A., Vanni, C.The fate of subducted basaltic crust in the Earth's lower mantle: an experimental petrological study.Lithos, ABSTRACTS only, Vol. 73, p. S93. abstractMantleSubduction
DS201112-0099
2011
MenguyyBoulard, E., Menguyy, Auzende, Benzerara, Bureau, Antonangeli, Corgne, Morard, Siebert, Perrilat, GuyotExperimental investigation of the stability of Fe rich carbonates in the lower mantle.Goldschmidt Conference 2011, abstract p.561.MantleCarbon reduced.... diamonds
DS1992-0295
1992
Menichet..S.Conticelli, S., Manetti, P., Menichet..S.Mineralogy, geochemistry and SR-isotopes in orendites from South Italy -constraints on their genesis and evolutionEuropean Journal of Mineralogy, Vol. 4, No. 6, Nov-Dec. pp. 1359-1375ItalyOrendites, Genesis
DS200612-0908
2006
Menishikov, Y.P.Menishikov, Y.P., Krivovichev, S.V., Pakhomovsky, Yakovenchuk, Ivanyuk, Mikhailova, Armbruster,SelivanovaChivruaiite, Ca(Ti,Nb)5(Si6O17)2 (OH,O)5.13-14H20, a new mineral from hydrothermal veins of Khibiny and Lovozero alkaline massifs.American Mineralogist, Vol. 91, 5-6, May pp. 922-928.Russia, Kola PeninsulaMineralogy - alkaline
DS1990-0101
1990
Menke, W.Abbott, D., Menke, W.Length of the global plate boundary at 2.4 GaGeology, Vol. 18, No. 1, January pp. 58-61GlobalCraton, Size of the plates
DS1999-0470
1999
Menke, W.Menke, W.Crustal isostasy indicates anomalous densities beneath IcelandGeophysical Research Letters, Vol. 27, No. 9, May pp. 1215-18.GlobalGeophysics - seismics, Isostasy
DS201609-1706
2016
Menke, W.Boyce, A., Bastow, I.D., Darbyshire, F.A., Ellwood, A.G., Gilligan, A., Levin, V., Menke, W.Subduction beneath Laurentia modifies the eastern North American cratonic edge: evidence from P wave and S wave tomography.Journal of Geophysical Research,, Vol. 121, 7, pp. 5013-5030.CanadaSubduction

Abstract: The cratonic cores of the continents are remarkably stable and long-lived features. Their ability to resist destructive tectonic processes is associated with their thick (~250 km), cold, chemically depleted, buoyant lithospheric keels that isolate the cratons from the convecting mantle. The formation mechanism and tectonic stability of cratonic keels remains under debate. To address this issue, we use P wave and S wave relative arrival-time tomography to constrain upper mantle structure beneath southeast Canada and the northeast USA, a region spanning three quarters of Earth's geological history. Our models show three distinct, broad zones: Seismic wave speeds increase systematically from the Phanerozoic coastal domains, through the Proterozoic Grenville Province, and to the Archean Superior craton in central Québec. We also recover the NW-SE trending track of the Great Meteor hot spot that crosscuts the major tectonic domains. The decrease in seismic wave speed from Archean to Proterozoic domains across the Grenville Front is consistent with predictions from models of two-stage keel formation, supporting the idea that keel growth may not have been restricted to Archean times. However, while crustal structure studies suggest that Archean Superior material underlies Grenvillian age rocks up to ~300 km SE of the Grenville Front, our tomographic models show a near-vertical boundary in mantle wave speed directly beneath the Grenville Front. We interpret this as evidence for subduction-driven metasomatic enrichment of the Laurentian cratonic margin, prior to keel stabilization. Variable chemical depletion levels across Archean-Proterozoic boundaries worldwide may thus be better explained by metasomatic enrichment than inherently less depleted Proterozoic composition at formation.
DS201706-1090
2017
Menke, W.Levin, V., Servali, A., VanTongeren, J., Menke, W., Darbyshire, F.Crust-mantle boundary in eastern North America, from the (oldest) craton to the (youngest) rift.Geological Society of America, SPE 526 pp. 107-132.United Statescraton

Abstract: The North American continent consists of a set of Archean cratons, Proterozoic orogenic belts, and a sequence of Phanerozoic accreted terranes. We present an ~1250-km-long seismological profile that crosses the Superior craton, Grenville Province, and Appalachian domains, with the goal of documenting the thickness, internal properties, and the nature of the lower boundary of the North American crust using uniform procedures for data selection, preparation, and analysis to ensure compatibility of the constraints we derive. Crustal properties show systematic differences between the three major tectonic domains. The Archean Superior Province is characterized by thin crust, sharp Moho, and low values of Vp/Vs ratio. The Proterozoic Grenville Province has some crustal thickness variation, near-uniform values of Vp/Vs, and consistently small values of Moho thickness. Of the three tectonic domains in the region, the Grenville Province has the thickest crust. Vp/Vs ratios are systematically higher than in the Superior Province. Within the Paleozoic Appalachian orogen, all parameters (crustal thickness, Moho thickness, Vp/Vs ratio) vary broadly over distances of 100 km or less, both across the strike and along it. Internal tectonic boundaries of the Appalachians do not appear to have clear signatures in crustal properties. Of the three major tectonic boundaries crossed by our transect, two have clear manifestations in the crustal structure. The Grenville front is associated with a change in crustal thickness and crustal composition (as reflected in Vp/Vs ratios). The Norumbega fault zone is at the apex of the regional thinning of the Appalachian crust. The Appalachian front is not associated with a major change in crustal properties; rather, it coincides with a zone of complex structure resulting from prior tectonic episodes, and thus presents a clear example of tectonic inheritance over successive Wilson cycles.
DS201708-1575
2017
Menke, W.Levin, V., Servali, A., VanTongeren, J., Menke, W., Darbyshire, F.Crust mantle boundary in eastern North America, from the (oldest) craton to the (youngest) rift.Geological Society of London, Chapter 6, pp. 107-132.United States, Canadatectonics

Abstract: The North American continent consists of a set of Archean cratons, Proterozoic orogenic belts, and a Sequence of Phanerozoic accreted terranes. We present an ~1250-km-long seismological profile that crosses the Superior craton, Grenville Province, and Appalachian domains, with the goal of documenting the thickness, internal properties, and the nature of the lower boundary of the North American crust using uniform procedures for data selection, preparation, and analysis to ensure compatibility of the constraints we derive. Crustal properties show systematic differences between the three major tectonic domains. The Archean Superior Province is characterized by thin crust, sharp Moho, and low values of Vp/Vs ratio. The Proterozoic Grenville Province has some crustal thickness variation, near-uniform values of Vp/Vs, and consistently small values of Moho thickness. Of the three tectonic domains in the region, the Grenville Province has the thickest crust. Vp/Vs ratios are systematically higher than in the Superior Province. Within the Paleozoic Appalachian orogen, all parameters (crustal thickness, Moho thickness, Vp/Vs ratio) vary broadly over distances of 100 km or less, both across the strike and along it. Internal tectonic boundaries of the Appalachians do not appear to have clear signatures in crustal properties. Of the three major tectonic boundaries crossed by our transect, two have clear manifestations in the crustal structure. The Grenville front is associated with a change in crustal thickness and crustal composition (as reflected in Vp/Vs ratios). The Norumbega fault zone is at the apex of the regional thinning of the Appalachian crust. The Appalachian front is not associated with a major change in crustal properties; rather, it coincides with a zone of complex structure resulting from prior tectonic episodes, and thus presents a clear example of tectonic inheritance over successive Wilson cycles.
DS202004-0529
2020
Menke, W.Petrescu, L., Bastow, I.D., Darbyshire, F.A., Gilligan, A., Bodin, T., Menke, W., Levin, V.Three billion years of crustal evolution in eastern Canada: constraints from receiver functions.Journal of Geophysical Research: Solid Earth, in press available, 24p. PdfCanadageophysics - seismics

Abstract: The geological record of SE Canada spans more than 2.5Ga, making it a natural laboratory for the study of crustal formation and evolution over time. We estimate the crustal thickness, Poisson's ratio, a proxy for bulk crustal composition, and shear velocity (Vs) structure from receiver functions at a network of seismograph stations recently deployed across the Archean Superior craton, the Proterozoic Grenville and the Phanerozoic Appalachian provinces. The bulk seismic crustal properties and shear velocity structure reveal a correlation with tectonic provinces of different ages: the post-Archean crust becomes thicker, faster, more heterogenous and more compositionally evolved. This secular variation pattern is consistent with a growing consensus that crustal growth efficiency increased at the end of the Archean. A lack of correlation among elevation, Moho topography, and gravity anomalies within the Proterozoic belt is better explained by buoyant mantle support rather than by compositional variations driven by lower crustal metamorphic reactions. A ubiquitous ~20km thick high-Vs lower-crustal layer is imaged beneath the Proterozoic belt. The strong discontinuity at 20km may represent the signature of extensional collapse of an orogenic plateau, accommodated by lateral crustal flow. Wide anorthosite massifs inferred to fractionate from a mafic mantle source are abundant in Proterozoic geology and are underlain by high Vs lower crust and a gradational Moho. Mafic underplating may have provided a source for these intrusions and could have been an important post-Archean process stimulating mafic crustal growth in a vertical sense.
DS200712-0716
2007
Menneken, M.Menneken, M., Nemchin, A.A., Geisler, T., Pidgeon, R.T., Wilde, S.A.Oldest terrestrial diamonds in zircon from Jack Hills, Western Australia.Plates, Plumes, and Paradigms, 1p. abstract p. A652.AustraliaJack Hills
DS200712-0717
2007
Menneken, M.Menneken, M., Newchin, A.A., Geisler, T., Pidgeon, R.T., Wilde, S.A.Hadean diamonds in zircon from Jack Hills, Western Australia.Nature, Vol. 448, August 23, pp. 917-921.Australia, Western AustraliaGeochronology
DS200812-0791
2008
Menneken, M.Nemchin, A.A., Whitehouse, M.J., Menneken, M., Geisler, T., Pidgeon, R.T., Wilde, S.A.A light carbon reservoir recorded in zircon hosted diamond from the Jack Hills.Nature, Vol. 454m, 7200, July 3, pp. 92-95.AustraliaGeochronology
DS1900-0430
1906
Mennell, F.P.Mennell, F.P.Somabula Diamond Field of RhodesiaGeology Magazine (London), Vol. 3, No. 508, PP. 459-462.Africa, ZimbabweAlluvial Diamond Placers
DS1900-0431
1906
Mennell, F.P.Mennell, F.P.The Somabula Diamond Field in RhodesiaSouth African Association Advanced Science, P. 289.Africa, ZimbabweDiamond Occurrence
DS1900-0582
1907
Mennell, F.P.Mennell, F.P.Somabula Diamond Fields of RhodesiaSouth African Association Advanced Science, Vol. 3, PP. 289-292.Africa, ZimbabweAlluvial Diamond Placers
DS1900-0688
1908
Mennell, F.P.Mennell, F.P.The Rhodesian Mines HandbookBulawayo:, Africa, ZimbabweDiamond, Geology
DS1900-0689
1908
Mennell, F.P.Mennell, F.P.Note on the Rhodesian Diamond FieldsGeological Society of South Africa Transactions, Vol. 11, PP. 43-44.Africa, ZimbabweGeology
DS1900-0690
1908
Mennell, F.P.Mennell, F.P.Notes on Some Diamond Bearing and Associated Rocks 1908South African Association Advanced Science Report, Vol. 4, PP. 105-106.Africa, ZimbabweMineralogy
DS1900-0785
1909
Mennell, F.P.Mennell, F.P.The Miner's Guide. a Practical Handbook for Prospectors, Working Miners, and Mining Men Generally.London: Gerrards Ltd., 196P.Africa, South Africa, GlobalProspecting, Genesis, Kimberley
DS1900-0786
1909
Mennell, F.P.Mennell, F.P.Notes on Some Diamond Bearing and Associated Rocks 1909South African Association Advanced Science Report, Vol. 5, PP. 105-106.Africa, South Africa, ZimbabweGeology
DS1910-0075
1910
Mennell, F.P.Mennell, F.P.The Geological Structure of Southern RhodesiaQuarterly Journal of Geological Society (London), Vol. 66, PP. 371-375.ZimbabweRegional Geology
DS1910-0369
1913
Mennell, F.P.Mennell, F.P.The Origin of the Somabula GravelsRhodesian Mining Review., APRIL 30TH., P.ZimbabweDiamond Genesis, Alluvial Diamond Placers
DS1910-0470
1915
Mennell, F.P.Mennell, F.P.Note on the Colours of Some Alluvial DiamondsMineralogical Magazine., Vol. 17, No. 81, PP. 202-204.ZimbabweColoured Diamonds, Crystallography
DS1930-0032
1930
Mennell, F.P.Mennell, F.P.Suggestions on the Origin of Diamond PipesBritish Association Handbook On South Africa And Science., PP. 325-326.South AfricaDiamond Genesis
DS1940-0126
1946
Mennell, F.P.Mennell, F.P.Ring Structures With Carbonate Cores in Southern RhodesiaGeology Magazine(London), Vol. 83, No. 3, PP. 137-140. ALSO: Mineralogical Magazine, Vol. 10, NZimbabweGeology
DS1990-1030
1990
Menner, A.V.Menner, A.V., Haser, A.Morphology features of lonsdeleite-containing diamondsInternational Mineralogical Association Meeting Held June, 1990 Beijing China, Vol. 1, extended abstract p. 79-80GlobalDiamond morphology, Lonsdeleite
DS1986-0570
1986
Mennessierm J.P.Midende, G., Demaiffe, D., Weis, D., Mennessierm J.P.Strontium, neodymium, and lead isotope evidence for the origin of carbonatites from the western branch of the African riftEos, Vol. 67, No. 44, Nov. 4, p. 1267. (abstract.)Africa, KenyaCarbonatite
DS1989-1006
1989
Menning, M.Menning, M.A synopsis of numerical time scales 1917-1986Episodes, Vol. 12, No. 1, March pp. 3-5. Database # 17836GlobalTime scales, Overview
DS201605-0831
2016
Meno, T.Du Toit, D., Meno, T., Telema, E., Boshoff, P., Hodder, A.Survey systems adopted to improve safety and efficiency at Finsch diamond mine.Diamonds Still Sparkling SAIMM 2016 Conference, Mar. 14-17, pp. 187-196.Africa, South AfricaDeposit - Finsch
DS1994-1168
1994
Meno, Y.Meno, Y., et al.Superconductivity in a layered perovskite without copperNature, Vol. 372, Dec. 8, pp. 532-534MantleSuperconductivity, Perovskite
DS200712-1205
2007
Menold, C.A.Yin, A., Manning, C.E., Lovera, O., Menold, C.A., Chen, X., Gehrels, G.Early Paleozoic tectonic and thermomechanical evolution of ultrahigh pressure (UHP) metamorphic rocks in the northern Tibetan Plateau, northwest China.International Geology Review, Vol. 49, 8, pp. 681-716.ChinaUHP
DS1983-0522
1983
Menot, R.P.Pouclet, A., Menot, R.P., Piboule, M.Le magmatism Alaclin Potassique de L'aire Volcanique des ViBulletin. MINERALOGIQUE., Vol. 106, PP. 607-622.East AfricaRift, Melilite, Leucite, Related Rocks
DS1991-0103
1991
Menot, R.P.Bernardgriffiths, J., Peucat, J.J., Menot, R.P.Isotopic (rubidium-strontium (Rb-Sr), uranium-lead (U-Pb) (U-Pb) and samarium-neodymium (Sm-Nd)) and trace element geochemistry ofLithos, Vol. 27, No. 1, June pp. 43-58AfricaGeochemistry, Geochronology
DS2001-0009
2001
Menot, R.P.Agbossoumonde, Y., Menot, R.P., Guillot, S.Metamorphic evolution of Neoproterozoic eclogites from south To go (West Africa)Journal of African Earth Sciences, Vol.33,2,Aug.pp.227-44.Togo, West AfricaEclogites, Metamorphism
DS201912-2813
2019
Mensah-Yeboah, F.Peters, M.H., Mensah-Yeboah, F., Milne, I.Remote monitoring at Snap Lake mine.Yellowknife Forum NWTgeoscience.ca, abstract volume p. 70.Canada, Northwest Territoriesdeposit - Snap Lake

Abstract: The Snap Lake Mine is a former underground diamond mine operated by De Beers Canada Inc. (De Beers), located about 220 km northeast of Yellowknife in the Northwest Territories. The Snap Lake mine operated from 2008 to 2015, and entered a Care and Maintenance mode in December 2015. The mine is currently entering its fourth year of being managed in this Extended Care and Maintenance phase. In order to ensure continual remote monitoring of certain key geotechnical, meteorological and air quality instrumentation and to enable visual observation of key infrastructure, work was done in 2018 to integrate new and existing monitoring instrumentation into the existing Campbell Scientific PakBus network. In this presentation De Beers will share a summary of this work, with the emphasis on the type of technology, detail of installation and integration of systems between the various pieces of instrumentation. First we will discuss installation of the 5 data collection stations that relay geotechnical instrumentation information. The data collection system at each of the 5 stations consists of a solar panel, battery, data logger, multiplexor and short-wave radio. To enable redundancy, a manual data collection via USB was added, in the event that remote communication with the stations is lost. Second, an overview of the installation of camera monitoring stations as well as the communications protocol used for the integration of the weather and ambient air quality data transmitted via satellite will be presented. While the focus will be on the technology and systems used for remote monitoring, and not the actual monitoring results per se, it is our intention to share this and some of the successes and challenges experienced during the first year of remote monitoring during zero occupancy conditions.
DS1993-1417
1993
Mensgagin, Y.V.Sekerin, A.P., Mensgagin, Y.V., Laschen..VA.Dokembrian lamproites of the Prisayan. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 329, No. 3, March pp. 328-331. # LG762RussiaLamproites
DS2001-0387
2001
MenshaginGladkochub, D.P., Sklyarov, E.V., Menshagin, MazukabzovGeochemistry of ancient ophiolites of the Sharyzhalgai upliftGeochemistry International, Vol. 39, No. 10, pp. 947-58.RussiaOphiolite - geochemistry
DS2002-0421
2002
MenshaginEgorov, K.N., Menshagin, Sekerin, Koshkarev, UshchapovNew dat a on mineralogy of sedimentary reservoirs of diamonds in the southwestern Siberian platform.Doklady, Vol.382, 1, Jan-Feb.pp. 109-11.Russia, SiberiaAlluvials, placers
DS200612-0366
2006
MenshaginEgorov, K.N., Soloveva, Kovach, Menshagin, Maslovskaya, Sekerin, BankovskayaPetrological features of olivine phlogopite lamproites of the Sayan region: evidence from the Sr Nd isotope and ICP MS trace element data.Geochemistry International, Vol. 44, 7. pp. 729-735.RussiaLamproite
DS1988-0622
1988
Menshagin, I.V.Sekerin, A.P., Menshagin, I.V., Lashchenov, V.A.Alkaline-ultrabasic rocks and carbonatites of the eastern Sayan. (Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 299, No. 3, pp. 711-714RussiaBlank
DS1990-1031
1990
Menshagin, I.V.Menshagin, I.V., Sekerin, A.P., Medvedev, T.I., Ushchapo.., Z.F.Ist find of priderite in kimberlites of the Irutsk Per-Sayan.(Russian)Doklady Academy of Sciences Akademy Nauk SSSR, (Russian), Vol. 312, No. 6, pp. 1440-1442RussiaMineralogy, Priderite
DS1990-1328
1990
Menshagin, I.V.Sekerin, A.P., Menshagin, I.V., Bogdanov, G.V., Medvedeva, T.I.On the occurrence of basic and ultrabasic inclusions in Precambrian kimberlites of the Peri-Sayan.(Russian)Dokl. Akad., Nauk SSSR, (Russian), Vol. 312, No. 5, pp. 1231-1234RussiaKimberlite, Basic inclusions
DS1991-1538
1991
Menshagin, V.Sekerin, A.P., Menshagin, V., Vladimirov, B.M., Lashchenov, V.A.Precambrian diamond bearing veined bodies from southwest of the SiberianPlatformProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 543-544RussiaVeins, lamproite, Chrome spinellids, geochronology
DS2000-0879
2000
Menshagin, Y.U.Sekerin, A.P., Menshagin, Y.U., Egorov, K.N.Mantle magmatism and diamond potential of the Tumanshet Graben, northeastern Sayany Region.Doklady Academy of Sciences, Vol. 371, No. 2, pp. 247-50.RussiaMagmatism, Tumanshet region
DS1992-1048
1992
Menshagin, Y.V.Menshagin, Y.V., et al.Petrology of Precambrian lamproites from East SiberiaProceedings of the 29th International Geological Congress. Held Japan August 1992, Vol. 2, abstract p. 572Russia, SiberiaLamproites
DS2003-1290
2003
Menshagin, Y.V.Sklyarov, E.V., Gladkochub, D.P., Mazukabzov, A.M., Menshagin, Y.V.Neoproterozoic mafic dike swarms of the Sharyzhalgai metamorphic massif, southernPrecambrian Research, Vol. 122, 1-4, pp.359-76.Russia, SiberiaDyke swarms, Magmatism
DS200412-1847
2003
Menshagin, Y.V.Sklyarov, E.V., Gladkochub, D.P., Mazukabzov, A.M., Menshagin, Y.V., Watanabe, T., Pisarevsky, S.A.Neoproterozoic mafic dike swarms of the Sharyzhalgai metamorphic massif, southern Siberian craton.Precambrian Research, Vol. 122, 1-4, pp.359-76.Russia, SiberiaDyke swarms Magmatism
DS200612-0367
2005
Menshagin, Y.V.Egorov, K.N., Soloveva, L.V., Kovach, V.P., Menshagin, Y.V., Maslovskaya, Sekerin, A.P., Bankovskaya, E.V.Mineralogical and isotope geochemical characteristics of Diamondiferous lamproites of the Sayan region.Doklady Earth Sciences, Vol. 403A, 6, pp. 861-865.RussiaGeochronology
DS1989-1367
1989
Menshagin, Yu.V.Sekerin, A.P., Menshagin, Yu.V., Lashchenov, V.A., Tverdokh, ebova, A.A.New occurrence of carbonatites and the structural control of alkaline Rocks in the eastern Sayan Province, USSR. (Russian)Izk. Iruktsk. USSR. Izv. Akad. Nauk SSSR, No. 8, pp. 34-41RussiaAlkaline rocks, Carbonatite
DS1992-1362
1992
Menshagin, Yu.V.Sekerin, A.P., Menshagin, Yu.V., Bogdanov, G.V., Medvedeva, T.I.Find of mafic and ultramafic inclusions in Precambrian kimberlite from the Sayan regionDoklady Academy of Science USSR, Earth Science Section, Vol. 312, No. 1-3, June pp. 203-205RussiaUltramafic inclusions, Kimberlite
DS1992-1363
1992
Menshagin, Yu.V.Sekerin, A.P., Menshagin, Yu.V., Lashchenov, V.A.New dat a on Precambrian kimberlites from the near Sayan regionSoviet Geology and Geophysics, Vol. 32, No. 12, pp. 57-63.Russia, SayanKimberlites, Textures
DS1994-1567
1994
Menshagin, Yu.V.Sekerin, A.P., Menshagin, Yu.V., Lepin, V.S., Revenko, A.high pressureotassium picritic basalts of the Sayan region, near IrkutskDoklady Academy of Sciences USSR, Vol. 326, Oct. pp. 127-130.Russia, SiberiaCraton, Alkaline rocks
DS1995-1234
1995
Menshagin, Yu.V.Menshagin, Yu.V., Sekerin, A.P.Composition and localization features of lamproite -like rocks in the Irkutsk Prisayanye area.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 377-378.Russia, IrkutskLamproite, Petrography
DS1995-1697
1995
Menshagin, Yu.V.Sekerin, A.P., Menshagin, Yu.V., Lashchenov, V.A.Sayan Precambrian lamproitesDoklady Academy of Sciences, Vol. 329A, No. 3, April, pp. 99-104.Russia, SayanLamproites
DS1995-1698
1995
Menshagin, Yu.V.Sekerin, A.P., Menshagin, Yu.V., Lashenov, V.A.high Pressureotassic mantle magmatism and the problems of diamond bearing in the Irkutsk Prisyanye area.Proceedings of the Sixth International Kimberlite Conference Abstracts, pp. 492-493.Russia, Irkutsk, PrisyanyeLamproite, Deposit -Ingashinskoe
DS1996-0944
1996
Menshagin, Yu.V.Menshagin, Yu.V., Sekerin, A.P.Ultrabasic rocks of the Kolba-Uda zone of the major Sayan faultRussian Geology and Geophysics, Vol. 37, No. 6, pp. 24-30.RussiaAlkaline rocks
DS1996-0945
1996
Menshagin, Yu.V.Menshagin, Yu.V., Sekerin, A.P.Mineralogy of mantle rocks of high Potassium content in the southern Siberian PlatformInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 2, p. 387.Russia, SiberiaMineralogy, Potassium, Metamorphic rocks
DS1996-1276
1996
Menshagin, Yu.V.Sekerin, A.P., Menshagin, Yu.V., Lashchenov, V.A.Origin of ultrabasic rocks of the dunite harzburigite association occurring in the Main Sayan Fault zone.Doklady Academy of Sciences, Vol. 340, No. 2, March., pp. 89-95.RussiaSiberian Craton, Malyy Tagui
DS1997-1017
1997
Menshagin, Yu.V.Sekerin, A.P., Egorov, K.N., Menshagin, Yu.V.Structural control and diamond potential of mantle magmatic rocks of The southwestern Siberian PlatformDoklady Academy of Sciences, Vol. 355A, No. 6, July-Aug. pp. 1324-26.Russia, SiberiaStructure, tectonics, Diamond genesis
DS2003-0375
2003
Menshagin, Yu.V.Egorov, K.N., Denisnko, E.P., Menshagin, Yu.V., Sekerin, A.P., Koshkarev, D.A.New occurrence of alkaline ultramafic rocks in the southern Siberian platformDoklady Earth Sciences, Vol. 390, 4, May-June pp. 478-82.RussiaAlkaline rocks
DS200412-0508
2003
Menshagin, Yu.V.Egorov, K.N., Denisnko, E.P., Menshagin, Yu.V., Sekerin, A.P., Koshkarev, D.A.New occurrence of alkaline ultramafic rocks in the southern Siberian platform.Doklady Earth Sciences, Vol. 390, 4, May-June pp. 478-82.RussiaAlkalic
DS200412-0509
2004
Menshagin, Yu.V.Egorov, K.N., Mishenin, S.G., Menshagin, Yu.V., Serov, V.P., Sekerin, A.P., Koshkarev, D.A.Kimberlite minerals from the lower Carboniferous deposits of the Mura-Kovinsky diamond bearing area.*** IN RUSSIAN LANGUAGEProceedings of the Russian Mineralogical Society ***in RUSSIAN, Vol. 133, 1,pp. 32-40 ***RUSSIANRussiaMineralogy
DS201112-0298
2010
Menshagin, Yu.V.Egorov, K.N., Kiselev, A.I., Menshagin, Yu.V., Minaeva, Yu.A.Lamproite and kimberlite of the Sayany area: composition, sources and diamond potenial.Doklady Earth Sciences, Vol. 435, 2, pp. 1670-1675.RussiaDiamond exploration
DS1950-0338
1957
Menshikov, P.N.Menshikov, P.N.Essai D'application des Methodes Geophysiques de Prospection a la Recherche des Chemines de Kimberlite.Razved. Okhr. Nedr., French Geological Survey (brgm) Translation No. 4371., No. 4, PP. 42-49.Russia, YakutiaKimberlite, Geophysics
DS1960-0012
1960
Menshikov, P.N.Balakshin, G.D., Menshikov, P.N.Tests on the Application of an Induction Method for Outlining Kimberlite Pipes.Razved. Okhr. Nedr. Sssr., No. 8.RussiaKimberlite, Geophysics
DS1960-0277
1962
Menshikov, P.N.Menshikov, P.N.Use of Geophysical Methods in Studying Kimberlite and Trap Rocks.Trudy Iafan Sssr Transactions Geol. Series, No. 8, PP. 115-120.RussiaKimberlite, Geophysics
DS2000-0044
2000
Menshikov, Y.P.Ayala, C., Kimbell, G.S., Menshikov, Y.P.Magnetic evidence for the geometry and evolution of the eastern margin of the East European Craton - s. UralsTectonophysics, Vol. 320, No. 1, Apr. 30, pp. 31-Europe, Russia, UralsGeophysics - magnetics, Craton - East European
DS200612-0084
2006
Menshikov, Y.P.Barkov, A.Y., Fleet, M.E., Martin, R.F., Menshikov, Y.P.Sr Na REE titanates of the crichtonite group from a fenitized megaxenolith, Khibin a alkaline complex, Kola Peninsula, Russia: first occurrence and implications.European Journal of Mineralogy, Vol. 18, 4, August pp. 493-502.Russia, Kola PeninsulaCarbonatite
DS200712-1195
2007
Menshikov, Y.P.Yakovenchuk, V.N., Pakhomovsky,Y.A., Menshikov, Y.P., Mikhailova, J.A., Ivanyuk, G.Y., Zalkind, O.A.Krivovichevite a new mineral species from the Lovozero alkaline massif, Kola Peninsula, Russia.The Canadian Mineralogist, Vol. 45, 3, pp. 451-456.Russia, Kola PeninsulaAlkaline rocks, mineralogy
DS200712-1196
2007
Menshikov, Y.P.Yakovenchuk, V.N., Pakhomovsky,Y.A., Menshikov, Y.P., Mikhailova, J.A., Ivanyuk, G.Y., Zalkind, O.A.Krivovichevite a new mineral species from the Lovozero alkaline massif, Kola Peninsula, Russia.The Canadian Mineralogist, Vol. 45, 3, pp. 451-456.Russia, Kola PeninsulaAlkaline rocks, mineralogy
DS201112-0539
2011
Menshikov, Yu.P.Korchak, Yu.A., Menshikov, Yu.P., Pakhomovskii, Ya.A., Yakovenchuk, V.N., Ivanyuk, G.Yu.Trap formation of the Kola Peninsula.Petrology, Vol. 19, 1, pp. 87-101.Russia, Kola PeninsulaAlkaline rocks, Lovozero and Khibiny
DS201602-0225
2015
Menshikov, Yu.P.Menshikov, Yu.P., Mikhailova, Yu.A., Pakhomovsky, Ya.A., Yakovenchuk, V.N., Ivanyuk, G.Yu.Minerals of zirconolite group from fenitized xenoliths in nepheline syenites of Khibiny and Lovozero plutons, Kola Peninsula.Geology of Ore Deposits, Vol. 57, 7, pp. 591-599.Russia, Kola PeninsulaDeposit - Lovozero

Abstract: Zirconolite, its Ce-, Nd-, and Y-analogs, and laachite, another member of the zirconolite group, are typomorphic minerals of the fenitized xenoliths in nepheline syenite and foidolite of the Khibiny-Lovozero Complex, Kola Peninsula, Russia. All these minerals are formed at the late stage of fenitization as products of ilmentie alteration under the effect of Zr-bearing fluids. The diversity of these minerals is caused by the chemical substitutions of Na and Ca for REE, Th, and U compensated by substitution of Ti and Zr for Nb, Fe and Ta, as well as by the redistribution of REE between varieties enriched in Ti (HREE) or Nb (LREE). The results obtained can be used in the synthesis of Synroc-type titanate ceramics assigned for the immobilization of actinides.
DS200712-0718
2007
Mentener, O.Mentener, O., Piccardo, G.B.Melt rock reaction processes in the mantle and their bearing on mantle petrology and chemistry.Lithos, Vol. 99, 1-2, pp. 3p. introduction.MantleMelting
DS1987-0465
1987
Mento, D.J.Mento, D.J., Ervin, C.P., McGinnis, L.D.Comment on periodic energy release in the New Madrid seismic zoneBulletin. Seismol. Soc. America, Vol. 77, No. 5, October pp. 1868-1869MidcontinentGeophysics
DS1900-0205
1903
Mentzel, O.F.Mentzel, O.F.Kommen in Deutsch Suedwest Afrika Diamanten Vor?Glueckauf., Vol. 39, No. 24, PP. 553-555. ALSO: GEOL. ZENT. BL., Vol.Africa, NamibiaDiamond
DS2002-0205
2002
Menuge, J.Brewer, T.S., Ahall, K.I., Darbyshire, D., Menuge, J.Geochemistry of late Mesoproterozoic volcanism in southwestern Scandinavia: implications for ...plate..Journal of Geological Society of London, Vol. 159, 2, pp. 129-44.ScandinaviaSveconorwegian Grenvillian plate tectonic models, Tectonics
DS200912-0795
2009
Menvielle, M.Verhoeven, O., MacQuet, A., Vacher, P., Rivoldini, A., Menvielle, M., Arrial, P.A., Chiblet, G., Tarits,P.Constraints on thermal state and composition of the Earth's lower mantle from electromagnetic impedances and seismic data.Journal of Geophysical Research, Vol. 114, B3, B03302.MantleGeophysics - seismics
DS1950-0414
1958
Menyailov, A.A.Menyailov, A.A., Ivanova, V.G.Certain Minerals in the Contacts and Country Rocks of the Kimberlite Pipes of Yakutia.Akad. Nauk Ser. Geol., No. 1RussiaBlank
DS1960-0169
1961
Menyailov, A.A.Menyailov, A.A.Almazy Yakutii: Petrografiya Mineralogiya I GeologiyaAkad. Nauk Sssr Trudy Yak. Fil. Sib. Otd. Ser. Geol., Sborni, No. 6, 228P.RussiaKimberlite
DS1960-0170
1961
Menyailov, A.A.Menyailov, A.A.Relationships between a Diabase Dike and the Kimberlite Pipe 'leningrad'.Akad. Nauk Ser. Geol., No. 6, P. 227.RussiaBlank
DS1960-0171
1961
Menyailov, A.A.Menyailov, A.A.Kimberlite and Trap Magmas, Their Contact Metamorphism and Interrelationships.Uch. Zap. Yakut. Gos University, No. 9, PP. 5-10.RussiaBlank
DS1960-0278
1962
Menyailov, A.A.Menyailov, A.A.Tuffs and Kimberlites of the Siberian Platform and Their Origin.Moscow: Izdat Nauka., 227P.RussiaKimberlite, Diamond, Kimberley
DS1960-0279
1962
Menyailov, A.A.Menyailov, A.A., Voskresenskaia, V.B.Pipes With Multistage Trap Sills in the Botuobuya RegionTrudy Iafan Sssr Transactions Geol. Series, No. 8, PP. 121-132.RussiaKimberlite
DS1960-0480
1964
Menyaylov, A.A.Menyaylov, A.A.Rheomorphic Veins in a Limestone Xenolith from the Peace Kimberlite Pipe.Doklady Academy of Science USSR, Earth Science Section., Vol. 145, No. 1-6, PP. 152-154.RussiaBlank
DS1997-0764
1997
Menzel-Jones, A.Menzel-Jones, A., Ferguson, I.J., Grant, N., Roberts, B.Deep Slave: probing the deep lithosphere beneath the Slave Craton and adjacent terranes using electromagnetic imaging.Geological Survey of Canada Forum 1997 abstracts, p. 4. AbstractNorthwest TerritoriesCraton, Geophysics - electromagnetic
DS1990-0800
1990
Menzhausen, J.Kane, R.E., McClure, S.F., Menzhausen, J.The legendary Dresden green diamondGems and Gemology, Vol. 26, Winter pp. 248-266IndiaHistory, Dresden diamond
DS1991-1130
1991
Menzie, M.A.Menzie, M.A., Bodinier, J.L., Thirlwall, M., Downes, H.Asthenosphere-lithosphere relationships within orogenic massifsProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 281-284ItalyThermal boundary layer, hydrofracturing, xenoliths, Proterozoic, classification, characteristics
DS1992-1295
1992
Menzie, W.D.Root, D.H., Menzie, W.D., Scott, W.A.Computer Monte Carlo simulation in quantitative resource estimationNonrenewable Resources, Vol. 1, No. 2, Summer pp. 125-138GlobalGeostatistics, ore reserves, Monte Carlo simulation
DS1995-1235
1995
Menzie. W.D.Menzie. W.D.Public attitudes and policies toward mineral resources on the brink of the21st centuryNonrenewable Resources, Vol. 4, No. 1, Spring pp. 1-11United StatesEconomics, Mineral resources -public awareness
DS1987-0447
1987
MenziesMattey, D.P., Exley, R.A., Boyd, S.R., Pillinger, C.T., MenziesCarbon isotopes in oceanic and continental lithosphereTerra Cognita, Conference abstracts Oceanic and Continental Lithosphere:, Vol. 7, No. 4, Autumn, abstract only p. 618GlobalBlank
DS1992-1072
1992
MenziesMing Zhang, Suddaby, P., Thompson, R.N., Thirwall, M.F., MenziesGeochemistry and petrogenesis of potassic volcanic rocks in northeast ChinaInternational Symposium Cenozoic Volcanic Rocks Deep seated xenoliths China and its, Abstracts pp. 15ChinaGeochemistry, Leucite basanite, olivine leucite
DS200412-1298
2004
Menzies, A.Menzies, A., Westerlund, K., Grutter, H., Gurney, J.J., Carlson, J., Fung, A., Nowicki, T.Peridotitic mantle xenoliths from kimberlites on the Ekati diamond mine property, NWT: major element compositions and implicatioLithos, Vol. 77, 1-4, Sept. pp. 395-412.Canada, Northwest TerritoriesSlave Craton, harzburgite, geothermometry, diamond grap
DS200612-0506
2006
Menzies, A.Grutter, H., Latti, D., Menzies, A.Cr saturation arrays in concentrate garnet compositions from kimberlite and their use in mantle barometry.Journal of Petrology, Vol. 47, 4, April pp. 801-820.MantleGeobarometry, chromite, chromium
DS201607-1288
2016
Menzies, A.Bussweiler, Y., Stone, R.S., Pearson, D.G., Luth, R.W., Stachel, T., Kjarsgaard, B.A., Menzies, A.The evolution of calcite bearing kimberlites by melt rock reaction: evidence from polymineralic inclusions within clinopyroxene and garnet megacrysts from Lac de Gras kimberlites, Canada.Contributions to Mineralogy and Petrology, Vol. 171, 7, 25p.Canada, Northwest TerritoriesDeposit - Lac de Gras arena

Abstract: Megacrystic (>1 cm) clinopyroxene (Cr-diopside) and garnet (Cr-pyrope) xenocrysts within kimberlites from Lac de Gras (Northwest Territories, Canada) contain fully crystallized melt inclusions. These ‘polymineralic inclusions’ have previously been interpreted to form by necking down of melts at mantle depths. We present a detailed petrographical and geochemical investigation of polymineralic inclusions and their host crystals to better understand how they form and what they reveal about the evolution of kimberlite melt. Genetically, the megacrysts are mantle xenocrysts with peridotitic chemical signatures indicating an origin within the lithospheric mantle (for the Cr-diopsides studied here ~4.6 GPa, 1015 °C). Textural evidence for disequilibrium between the host crystals and their polymineralic inclusions (spongy rims in Cr-diopside, kelyphite in Cr-pyrope) is consistent with measured Sr isotopic disequilibrium. The preservation of disequilibrium establishes a temporal link to kimberlite eruption. In Cr-diopsides, polymineralic inclusions contain phlogopite, olivine, chromite, serpentine, and calcite. Abundant fluid inclusion trails surround the inclusions. In Cr-pyropes, the inclusions additionally contain Al-spinel, clinopyroxene, and dolomite. The major and trace element compositions of the inclusion phases are generally consistent with the early stages of kimberlite differentiation trends. Extensive chemical exchange between the host phases and the inclusions is indicated by enrichment of the inclusions in major components of the host crystals, such as Cr2O3 and Al2O3. This chemical evidence, along with phase equilibria constraints, supports the proposal that the inclusions within Cr-diopside record the decarbonation reaction: dolomitic melt + diopside ? forsterite + calcite + CO2, yielding the observed inclusion mineralogy and producing associated (CO2-rich) fluid inclusions. Our study of polymineralic inclusions in megacrysts provides clear mineralogical and chemical evidence for an origin of kimberlite that involves the reaction of high-pressure dolomitic melt with diopside-bearing mantle assemblages producing a lower-pressure melt that crystallizes a calcite-dominated assemblage in the crust.
DS201608-1397
2016
Menzies, A.Bussweiler, Y., Stone, R.S., Pearson, D.G., Luth, R.W., Stachel, T., Kjarsgaard, B.A., Menzies, A.The evolution of calcite bearing kimberlites by melt rock reaction: evidence from polymineralic inclusions within clinopyroxene and garnet megacrysts from Lac de Gras kimberlites, Canada.Contributions to Mineralogy and Petrology, in press available 25p.Canada, Northwest TerritoriesDeposit - Lac de Gras

Abstract: Megacrystic (>1 cm) clinopyroxene (Cr-diopside) and garnet (Cr-pyrope) xenocrysts within kimberlites from Lac de Gras (Northwest Territories, Canada) contain fully crystallized melt inclusions. These ‘polymineralic inclusions’ have previously been interpreted to form by necking down of melts at mantle depths. We present a detailed petrographical and geochemical investigation of polymineralic inclusions and their host crystals to better understand how they form and what they reveal about the evolution of kimberlite melt. Genetically, the megacrysts are mantle xenocrysts with peridotitic chemical signatures indicating an origin within the lithospheric mantle (for the Cr-diopsides studied here ~4.6 GPa, 1015 °C). Textural evidence for disequilibrium between the host crystals and their polymineralic inclusions (spongy rims in Cr-diopside, kelyphite in Cr-pyrope) is consistent with measured Sr isotopic disequilibrium. The preservation of disequilibrium establishes a temporal link to kimberlite eruption. In Cr-diopsides, polymineralic inclusions contain phlogopite, olivine, chromite, serpentine, and calcite. Abundant fluid inclusion trails surround the inclusions. In Cr-pyropes, the inclusions additionally contain Al-spinel, clinopyroxene, and dolomite. The major and trace element compositions of the inclusion phases are generally consistent with the early stages of kimberlite differentiation trends. Extensive chemical exchange between the host phases and the inclusions is indicated by enrichment of the inclusions in major components of the host crystals, such as Cr2O3 and Al2O3. This chemical evidence, along with phase equilibria constraints, supports the proposal that the inclusions within Cr-diopside record the decarbonation reaction: dolomitic melt + diopside ? forsterite + calcite + CO2, yielding the observed inclusion mineralogy and producing associated (CO2-rich) fluid inclusions. Our study of polymineralic inclusions in megacrysts provides clear mineralogical and chemical evidence for an origin of kimberlite that involves the reaction of high-pressure dolomitic melt with diopside-bearing mantle assemblages producing a lower-pressure melt that crystallizes a calcite-dominated assemblage in the crust.
DS202101-0014
2020
Menzies, A.Gruber, B., Chacko, T., Pearson, D.G., Currie, C., Menzies, A.Heat production and moho temperatures in cratonic crust: evidence from lower crustal xenoliths from the Slave craton.Lithos, doi.org/10.1016/ j.lithos.2020.105889 13p. PdfCanada, Northwest Territoriesdeposit - Diavik A-154

Abstract: Ambient Moho temperatures and lower crustal heat production are surprisingly poorly constrained in cratons. Here we address these problems using 15 lower crustal xenoliths from the Diavik A-154 kimberlite, Slave craton, Canada. Iron-magnesium exchange geothermometry on small biotite and amphibole inclusions in garnet indicates that the Slave craton lower crust was at a temperature of =500 °C at the time of kimberlite eruption (~55 Ma). The ambient lower crustal temperature was likely lower than 500 °C because the thermometers record the closure temperature of diffusional Fe2+-Mg exchange between touching mineral pairs. New measurements of K, U and Th concentrations in the constituent minerals, together with xenolith modes, allow reconstruction of the heat-producing element (HPE) K, U, and Th budget of the Slave craton lower crust. Metasedimentary granulites have an average heat production of 0.29 ± 0.01 µW/m3 (n = 3) whereas mafic granulites have an average heat production of 0.13 ± 0.03 µW/m3 (n = 12). Our new data clearly show that plagioclase abundance in both lithologies has a major influence on overall lower crustal heat production, being an important reservoir of all three HPE. Combining the heat production of mafic and metasedimentary granulites in their observed 80:20 proportions results in an average heat production value for the Slave craton lower crust of 0.16 ± 0.03 µW/m3. Using these heat production estimates, modeled Moho temperatures beneath Diavik of ~450-470 °C are broadly consistent with maximum lower crustal temperatures indicated by geothermometry. The low HPE contents predicted for cratonic lower crust must result in lower temperatures in the deep crust and mantle lithosphere, and in turn higher estimates for the thickness of mantle lithosphere. This effect becomes larger as the thickness of the low-HPE lower crustal layer increases. In the specific case of the central Slave craton, we find that model estimates of the diamond potential of the mantle lithosphere, as judged by the proportion of lithospheric mantle in the diamond stability field, are not strongly affected by small variations in lower crustal heat production and Moho temperature.
DS1995-0384
1995
Menzies, A.H.Daniels, L.R.M., Richardson, S.H., Menzies, A.H., De BruinDiamondiferous garnet macrocrysts in the Newlands kimberlite, South Africa-rosetta stones from KaapvaalProceedings of the Sixth International Kimberlite Conference Extended Abstracts, p. 121-123.South AfricaHarzburgites, Deposit -Newlands
DS1998-0993
1998
Menzies, A.H.Menzies, A.H., Baumgartner, M.C.Application of garnet geothermometry to southern African kimberlites7th International Kimberlite Conference Abstract, pp. 570-2.South AfricaGeothermometry, Deposit - Newlands, Kimberley area
DS1998-0994
1998
Menzies, A.H.Menzies, A.H., Gurney, J.J., Harte, B., Hauri, E.rare earth elements (REE) patterns in diamond bearing eclogites and diamond bearing peridotites from Newlands kimberlite.7th International Kimberlite Conference Abstract, pp. 573-5.South AfricaEclogites, peridotites, Deposit - Newlands
DS1998-0995
1998
Menzies, A.H.Menzies, A.H., Milledge, H.J.M., Gurney, J.J.Fourier transform infra red (FTIR) spectroscopy of Newlands diamonds7th International Kimberlite Conference Abstract, pp. 576-8.South AfricaSpectroscopy, Deposit - Newlands
DS1998-0996
1998
Menzies, A.H.Menzies, A.H., Shirey, S.B., Carlson, R.W., Gurney, J.J.Re Os isotope systematics of diamond bearing eclogites and peridotites from New lands kimberlite.7th International Kimberlite Conference Abstract, pp. 579-1.South AfricaGeochronology, Deposit - Newlands
DS1999-0471
1999
Menzies, A.H.Menzies, A.H., Carlson, R.W., Shirey, S.B., Gurney, J.J.Re Os systematics of Newlands peridotite xenoliths: implications for diamond lithosphere formation.7th International Kimberlite Conference Nixon, Vol. 2, pp. 566-73.South AfricaGeochronology, geothermometry, Deposit - Newlands
DS2003-0513
2003
Menzies, A.H.Grutter, H.S., Menzies, A.H.Mutually consistent classification schemes for mantle derived garnet and chromite, for8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, AbstractGlobalDiamond exploration - mineralogy, Mantle phase petrology
DS2003-0938
2003
Menzies, A.H.Menzies, A.H., Carlson, R.W., Shirey, S.B., Gurney, J.J.Re Os systematics of diamond bearing eclogites from the Newlands kimberliteLithos, Vol. 71, 2-4, pp. 323-336.South AfricaGeochronology - deposit
DS2003-0939
2003
Menzies, A.H.Menzies, A.H., Frazenburg, M., Baumgartner, M.C., Gurney, J.J., Moore, R.O.Evaluation of chromites derived from kimberlites and implications for diamond8 Ikc Www.venuewest.com/8ikc/program.htm, Session 8, POSTER abstractAustraliaBlank
DS2003-0940
2003
Menzies, A.H.Menzies, A.H., Westerlund, K., Gurney, J.J., Carlson, J., Fung, A., Nowicki, T.Peridotite mantle xenoliths from kimberlites on the Ekati property, Northwest8 Ikc Www.venuewest.com/8ikc/program.htm, Session 4, AbstractNorthwest TerritoriesMantle geochemistry, Deposit - Ekati
DS200412-0734
2004
Menzies, A.H.Grutter, H.S., Gurney, J.J., Menzies, A.H., Winter, F.An updated classification scheme for mantle derived garnet, for use by diamond explorers.Lithos, Vol. 77, 1-4, Sept. pp. 841-857.TechnologyExploration, pyrope, Ca intercept, peridotite, megacrys
DS200412-0735
2003
Menzies, A.H.Grutter, H.S., Menzies, A.H.Mutually consistent classification schemes for mantle derived garnet and chromite, for use by diamond explorers.8 IKC Program, Session 8, AbstractTechnologyDiamond exploration - mineralogy Mantle phase petrology
DS200412-1299
2003
Menzies, A.H.Menzies, A.H., Carlson, R.W., Shirey, S.B., Gurney, J.J.Re Os systematics of diamond bearing eclogites from the Newlands kimberlite.Lithos, Vol. 71, 2-4, pp. 323-336.Africa, South AfricaGeochronology - deposit
DS200412-1300
2003
Menzies, A.H.Menzies, A.H., Frazenburg, M., Baumgartner, M.C., Gurney, J.J., Moore, R.O.Evaluation of chromites derived from kimberlites and implications for diamond exploration programs.8 IKC Program, Session 8, POSTER abstractAustraliaDiamond exploration
DS200412-1301
2003
Menzies, A.H.Menzies, A.H., Westerlund, K., Gurney, J.J., Carlson, J., Fung, A., Nowicki, T.Peridotite mantle xenoliths from kimberlites on the Ekati property, Northwest Territories, Canada.8 IKC Program, Session 4, AbstractCanada, Northwest TerritoriesMantle geochemistry Deposit - Ekati
DS1995-1236
1995
Menzies, J.Menzies, J.Modern glacial environments: processes, dynamics and sedimentsButterworth, 621p. approx.$ United States 70.00GlobalGeomorphology -glacial, Book -review
DS1996-0946
1996
Menzies, J.Menzies, J.Past glacial environments.. sediments, forms and techniquesButterworth, Vol. 2GlobalBook - table of contents, Glaciology, galciomarine, paleosols
DS201212-0227
2012
Menzies, J.Gao, C., McAndrews, J.H., Wang, X., Menzies, J., Turton, C.L., Wood, B.D., Pei, J., Kodors, C.Glaciation of North America in the James Bay Lowland, Canada, 3-5 Ma.Geology, Vol. 40, 11, pp. 975-978.Canada, Ontario, James Bay LowlandsGeomorphology
DS1980-0234
1980
Menzies, M.Menzies, M., Murthy, V.R.Enriched Mantle: Neodymium and Strontium Isotopes in Diopsides from kimber Lite Nodules.Nature., Vol. 283, PP. 634-636.South AfricaBultfontein, Kimberley
DS1985-0438
1985
Menzies, M.Menzies, M.Alkaline Magmas: a Window on the Earth's MantleConference Report of A Meeting of The Volcanic Studies Group, 1P. ABSTRACT.GlobalNodules, Petrography
DS1985-0439
1985
Menzies, M.Menzies, M., Kempton, P., Dungan, M.Interaction of Continental Lithosphere and Asthenosphere Melts Below the Geronimo Volcanic Field, Arizona UsaJournal of PETROLOGY, Vol. 26, No. 3, AUGUST PP. 663-693.United States, Colorado Plateau, ArizonaMantle Evolution
DS1986-0562
1986
Menzies, M.Menzies, M., Halliday, A., Palacz, Z., Hunter, R., Hawkesworth, C.Barium and light rare earth element (LREE) enriched mantle below the Archean crust of ScotlandProceedings of the Fourth International Kimberlite Conference, Held, No. 16, pp. 294-295ScotlandBlank
DS1987-0196
1987
Menzies, M.Ewart, A., Chappell, B.W., Menzies, M.Petrogenesis of the eastern Australian Cainozoic volcanic provincesTerra Cognita, Conference abstracts Oceanic and Continental Lithosphere:, Vol. 7, No. 4, Autumn, abstract only p. 613AustraliaBlank
DS1988-0459
1988
Menzies, M.Menzies, M., Halliday, A.Lithospheric mantle domains beneath the Archean and Proterozoic crust ofScotlandJournal of Petrology, Special Volume 1988- Oceanic and Continental, pp. 275-302ScotlandMantle
DS1991-1131
1991
Menzies, M.Menzies, M., Dupuy, C., Nicolas, A.Orogenic lherzolites and mantle processes #2Terra News, Vol. 3, No. 1, pp. 6-8GlobalWorkshop -overview, Mantle -lherzolites
DS1994-1169
1994
Menzies, M.Menzies, M., Chazot, G.Mantle metasomatism -the transfer of silicate and non-silicate melts in theearth's mantle.International Symposium Upper Mantle, Aug. 14-19, 1994, pp. 117-136.MantleMetasomatism, Diamond facies mantle
DS1995-1237
1995
Menzies, M.Menzies, M., Chazot, G.Fluid processes in diamond to spinel facies shallow mantleJournal of Geodynamics, Vol. 20, No. 4, Dec. pp. 387-415.MantleDiamond morphology, Petrology
DS1997-0184
1997
Menzies, M.Chazot, G., Lowry, D., Menzies, M., Mattey, D.Oxygen isotopic composition of hydrous and anhydrous mantle peridotitesGeochimica et Cosmochimica Acta, Vol. 61, No. 1, Jan. pp. 161-169.MantlePeridotites, Geochronology
DS1998-0069
1998
Menzies, M.Baker, J., Chazot, G., Menzies, M., Thirwall, M.Metasomatism of the shallow mantle beneath Yemen by the Afar plume -implications for mantle plumes, flood...Geology, Vol. 26, No. 5, May pp. 431-434.Globalvolcanism - intraplate, Lherzolite xenoliths
DS1982-0194
1982
Menzies, M.A.Erlank, A.J., Allsopp, H.L., Hawkesworth, C.J., Menzies, M.A.Chemical and Isotopic Characterisation of Upper Mantle Metasomatism in Peridotite Nodules from the Bultfontein Kimberlite.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. 261-263, (abstract.).South AfricaKimberlite
DS1982-0323
1982
Menzies, M.A.Kempton, P.D., Dungan, M.A., Menzies, M.A.Petrology and Geochemistry of Ultramafic Xenoliths from The geronimo Volcanic FieldProceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, P. 222, (abstract.).United States, Arizona, Colorado PlateauBlank
DS1982-0432
1982
Menzies, M.A.Menzies, M.A., Kempton, P., Dungan, M.Nature of the Continental Mantle Below the Geronimo Volcanic Field Arizona, United States (us)Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. 230-231, (abstract.).ArizonaKimberlite, Rare Earth Elements (ree), Rocky Mountains
DS1982-0433
1982
Menzies, M.A.Menzies, M.A., Wass, S.Y.Metasomatism and Chemical Heterogeneity in the Sub-continental Mantle: Sr and Nd Isotopic Analysis of Apatite Rich Xenoliths and Alkaline Magmas from Eastern Australia.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 231, (abstract.).AustraliaKimberlite, Geochemistry
DS1983-0295
1983
Menzies, M.A.Hawkesworth, C.J., Menzies, M.A.Kimberlites RevisitedNature., Vol. 302, No. 5907, PP. 380-381.GlobalOrigin, Genesis
DS1983-0448
1983
Menzies, M.A.Menzies, M.A.Mantle Metsomatism and Mantle Enrichment As Discrete Events in Ultramafic Xenoliths.Paper Presented At The Volcanic Studies Group Meeting, Feb., GlobalRare Earth Elements (ree), Geochemistry, Genesis
DS1983-0449
1983
Menzies, M.A.Menzies, M.A., Leeman, W.P., Hawkesworth, C.J.Isotope Geochemistry of Cenozoic Volcanic Rocks Reveals Mantle Heterogeneity Below Western UsaNature., Vol. 303, No. 5914, PP. 205-209.United StatesGenesis, Geochemistry
DS1983-0450
1983
Menzies, M.A.Menzies, M.A., Wass, S.Y.Co2 and Light Rare Earth Element (lree) Rich Mantle Below Eastern Australia: a Rare Earth Elements (ree) AndEarth Plan. Sci. Letters, Vol. 65, PP. 287-302.Australia, New South WalesMetasomatism, Leucite, Isotope
DS1984-0399
1984
Menzies, M.A.Kempton, P.D., Menzies, M.A., Dungan, M.A.Petrography, Petrology and Geochemistry of Xenoliths and Megacrysts from the Geronimo Volcanic Field, Southeastern Arizona.Proceedings of Third International Kimberlite Conference, Vol. 2, PP. 71-83.United States, Colorado Plateau, ArizonaHarzburgite, Lherzolite, Rare Earth Elements (ree), Websterite, Wehrlite, Mineral Chemistry
DS1986-0536
1986
Menzies, M.A.Mattey, D., Pillinger, C.T., Menzies, M.A.Abundances and carbon isotope compositions of trapped fluids in mantlediopsides: implications for mantle recycyling modelsProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 276-278GlobalBlank
DS1987-0282
1987
Menzies, M.A.Hawkesworth, C.J., Van Calsteren, P., Rogers, N.W., Menzies, M.A.Isotope variations in recent volacnics: a trace element perspectiveIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 365-388GlobalBlank
DS1987-0466
1987
Menzies, M.A.Menzies, M.A., Halliday, A.N., Palacz, Z., Hunters, R.H., UptonEvidence from mantle xenoliths for an enriched lithospheric keel under the outer HebridesNature, Vol. 325, January 1, pp. 44-47GlobalMantle xenoliths
DS1987-0467
1987
Menzies, M.A.Menzies, M.A., Hawkesworth, C.J.Mantle MetasomatismAcademic Press, 465pGlobalAlkaline Magma, Mantle genesis
DS1987-0468
1987
Menzies, M.A.Menzies, M.A., Hawkesworth, C.J.Upper mantle processes and compositionin: Nixon, P.H. ed. Mantle xenoliths, J. Wiley, pp. 725-738GlobalBlank
DS1987-0469
1987
Menzies, M.A.Menzies, M.A., Rogers, N., Tindle, A., Hawkesworth, C.J.Metasomatic and enrichment processes in lithospheric peridotites, an effectof asthenosphere-lithosphere interactionIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 313-364GlobalBlank
DS1988-0206
1988
Menzies, M.A.Ewart, A., Chappell, B.W., Menzies, M.A.An overview of the geochemical and isotopic characteristics of the Eastern Australian Cainozoic volcanic provincesJournal of Petrology, Special Volume 1988- Oceanic and Continental, pp. 225-273AustraliaGeochemistry, Geochronology
DS1988-0235
1988
Menzies, M.A.Gamble, J.A., McGibbon, F., Kyle, P.R., Menzies, M.A., Kirsch, I.Metasomatised xenoliths from Foster Crater Antarctica:implications for lithospheric structure and processes beneath the Transantarctic Mountain FrontJournal of Petrology, Special Volume 1988- Oceanic and Continental, pp. 109-138AntarcticaFoster Crater
DS1989-0959
1989
Menzies, M.A.Mattey, D.P., Exley, R.A., Pillinger, C.T., Menzies, M.A., PorcelliRelationships between Carbon, Heleum, Strontium and neodymium isotopes in mantle diopsidesGeological Society of Australia Inc. Blackwell Scientific Publishing, No. 14, Vol. 2, pp. 913-921GlobalMantle xenoliths
DS1989-1007
1989
Menzies, M.A.Menzies, M.A.Cratonic, circumcratonic and oceanic mantle domains beneath the western United StatesJournal of Geophysical Research, Special Section: Magmatism associated with, Vol. 94, No. 6, June 10, pp. 7899-7915GlobalXenoliths, Mantle
DS1989-1008
1989
Menzies, M.A.Menzies, M.A., Halliday, A.N., Hunter, R.H., MacIntyre, R.M., UptonThe age, composition and significance of a xenolith bearing monchiquitedike, Lewis, ScotlandGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 843-852ScotlandMantle xenoliths
DS1990-0190
1990
Menzies, M.A.Ben Othman, D., Tilton, G.R., Menzies, M.A.lead, neodymium, and Strontium isotopic investigations of kaersutite and clinopyroxene from ultramafic nodules and their host basalts: the nature of the subcontinental mantleGeochimica et Cosmochimica Acta, Vol. 54, pp. 3449-3460California, Arizona, New MexicoMantle, Nodules -kaersutites
DS1990-0217
1990
Menzies, M.A.Bodinier, J.-L., Menzies, M.A., Thirwall, M.Elemental and isotopic geochemistry of the Lanzo Lherzolite Massif:implications for the temporal evolution of the Morb sourceTerra, Abstracts of International Workshop Orogenic Lherzolites and Mantle Processes, Vol. 2, December abstracts p. 126ItalyLherzolite, Geochemistry
DS1990-1032
1990
Menzies, M.A.Menzies, M.A.Continental mantleOxford University of Press, 230pGlobalMantle processes
DS1991-0771
1991
Menzies, M.A.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
DS1991-1009
1991
Menzies, M.A.Long, A., Thirwall, M.F., Menzies, M.A., Upton, B.G.J., Aspen, P.Geochemical systematics in mantle megacrysts and their host basalts From the Archean craton and post Archean mobile belts of ScotlandProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 241-244ScotlandLoch Raog Lewis, xenolith, mica megacryst, Dunaksin Glen, Kiers Hill, Elie Ness, Colonsay, cpx megacry
DS1991-1928
1991
Menzies, M.A.Zhang, M., Menzies, M.A., Suddaby, P., Thirlwall, M.F.EMI signature from within the post-Archean subcontinental lithosphere mantle-isotopic evidence from the potassic volcanic rocks in northeast ChinaGeochemical Journal, Vol. 25, No. 5, pp. 387-398ChinaPotassic rocks, Geochemistry -EMI
DS1992-1049
1992
Menzies, M.A.Menzies, M.A.The lower lithosphere as a major source for continental flood basalts: are-appraisal.Geological Society Special Publication, Magmatism and the Causes of Continental, No. 68, pp. 31-39.MantleBasalts
DS1992-1050
1992
Menzies, M.A.Menzies, M.A., Fan Weiming, Baker, J., Thirlwall, M.F., Ming ZhangThe lower lithosphere of eastern China: on craton/ off craton isotopic provinciality or recent recycling?International Symposium Cenozoic Volcanic Rocks Deep seated xenoliths China and its, Abstracts pp. 85-88ChinaCraton, Geochronology
DS1992-1051
1992
Menzies, M.A.Menzies, M.A., Fan Weiming, Ming ZhangDepleted and enriched lithosphere beneath eastern China: evidence from Quaternary alkaline volcanic rocks and their xenolithsEos Transactions, Vol. 73, No. 14, April 7, supplement abstracts p. 324ChinaAlkaline rocks, Xenoliths
DS1993-1019
1993
Menzies, M.A.Menzies, M.A., Bodinier, J.L.Growth of the European lithospheric mantle-dependence of upper mantle peridotite facies and chemical heterogeneity on tectonics and age.Physics of the Earth and Planetary Interiors, Vol. 79, pp. 219-240.EuropeMantle, Peridotites
DS1993-1020
1993
Menzies, M.A.Menzies, M.A., Bodinier, J.L.Growth of the European lithospheric mantle- dependence of upper mantle peridotite facies and chemical heterogeneity on tectonics and age.Physics and Earth Planetary Sciences, Vol. 79, No. 1-2, August pp. 219-240.Europe, MantleTectonics, Peridotite
DS1994-0288
1994
Menzies, M.A.Chazot, G., Menzies, M.A., Harte, B., Matteym D.Carbonatite metasomatism and melting of the Arabian lithosphere: evidence from trace element composition.Mineralogical Magazine, Vol. 58A, pp. 167-168. AbstractGlobalCarbonatite, Lherzolites
DS1994-0289
1994
Menzies, M.A.Chazot, G., Menzies, M.A., Lowry, D., Mattey, D.P.Fluid peridotite interaction in spinel facies mantle: oxygen composition of hydrous and anhydrous lherzolitesInternational Symposium Upper Mantle, Aug. 14-19, 1994, Extended abstracts pp. 70-72.GlobalMetasomatism
DS1994-1170
1994
Menzies, M.A.Menzies, M.A., Bodinier, J.L., Downes, H., Thirlwall, M.Temporal and spatial relationships organic lherzolite massifs -a key understanding depleted and shallow mantle xenoliths.Proceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 423-433.MantleXenoliths, Lherzolites
DS1995-2128
1995
Menzies, M.A.Zhang, M., Suddaby, P., Menzies, M.A.Potassic volcanic rocks in northeast China: geochemical constraints on mantle source and magma genesis.Journal of Petrology, Vol. 36, No. 5, Oct. 1, pp. 1275-1304.ChinaGeochemistry, Volcanics
DS1996-0442
1996
Menzies, M.A.Fan, W.M., Menzies, M.A.Lithospheric thinning and accretion in Mesozoic- Cenozoic eastern China:isotopic study mantle xenolithsInternational Geological Congress 30th Session Beijing, Abstracts, Vol. 1, p. 122.ChinaXenoliths
DS1998-1607
1998
Menzies, M.A.Xu, Y.G., Bodinier, J.L., Bedini, R.M., Menzies, M.A.Xenolith evidence for melt rock reaction at the lithosphere plumeboundary.Mineralogical Magazine, Goldschmidt abstract, Vol. 62A, p. 1671-2.FrancePetrography, geochemistry, Harzburgites, Boree P type
DS2000-0281
2000
Menzies, M.A.Fan, W.M., Zhang, H.F., Menzies, M.A.On and off the North Chin a Craton: where is the Archean keel?Journal of Petrology, Vol. 41, No. 7, July pp. 933-50.ChinaCraton - keel, Tectonics, mobile belts
DS2000-0653
2000
Menzies, M.A.Menzies, M.A., Ebinger, C.Volcanic rifted margins. Penrose conference reportGsa Today, Aug, pp. 8-11.MantleMagmatism, plumes, rifting
DS2000-1046
2000
Menzies, M.A.Zhang, H., Menzies, M.A., Lu, F.Major and trace element studies on garnets Paleozoic kimberlite borne mantle xenoliths and megacrystsScience in China Series d: Earth Sciences, Vol. 43, No. 4, pp. 423-30.ChinaNorth China Craton, Garnet mineralogy
DS2001-1273
2001
Menzies, M.A.Xu, Y.G., Menzies, M.A., Thirwall, M.F., Xie, G.H.Exotic lithosphere mantle beneath the western Yangtze craton: petrogenetic links to Tibet using ultrapotassicGeology, Vol. 29, No. 9, Sept. pp. 863-866.China, Tibet, Asiaultra high pressure (UHP), ultrapotassic highly magnesian, Metasomatism
DS2001-1300
2001
Menzies, M.A.Zhang, H., Menzies, M.A., Gurney, J.J., Zhou, X.Cratonic peridotites and silica rich melts, diopside enstatite relationships in polymict xenoliths, KaapvaalGeochimica et Cosmochimica Acta, Vol. 65, No. 19, pp. 3365-77.South AfricaGeochemistry - peridotites, Craton - Kaapvaal
DS2001-1301
2001
Menzies, M.A.Zhang, H.F., Menzies, M.A., Mattey, Hinton, GurneyPetrology, mineralogy and geochemistry of oxide minerals in polymict xenoliths from Bultfontein...Contributions to Mineralogy and Petrology, Vol. 141, No. 3, June, pp. 367-79.South AfricaGeochronology - low bulk rock oxygen ratios, Deposit - Bultfontein
DS2002-0093
2002
Menzies, M.A.Baker, J., Chazot, G., Menzies, M.A., Thirlwall, M.Lithospheric mantle beneath Arabia: a Pan-African protolith modified by the Afar and older plumes, rather than a source for continental flood volcanism?Geological Society of America Special Paper, No. 362, pp. 65-80.Arabia, AfricaHeat flow, geothermometry
DS2002-1047
2002
Menzies, M.A.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Volcanic rifted marginsGeological Society of America Special Paper, 362, 230p.GlobalBook - volcanism, tectonics
DS2002-1048
2002
Menzies, M.A.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Characteristics of volcanic rifted marginsGeological Society of America Special Paper, No, 362, pp. 1-14.GlobalOverview
DS2003-0941
2003
Menzies, M.A.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Volcanic rifted marginsGeological Society of America Special Paper, No. 362, 470p. $ 80. www.geosociety.org/bookstoreEast Africa, Colorado, Madagascar, Greenland, NamibiaDike swarms, volcanology, Book
DS2003-0942
2003
Menzies, M.A.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Characteristics of volcanic rifted marginsGeological Society of America Special Paper, No. 362, chapter 1.GlobalOverview
DS2003-1514
2003
Menzies, M.A.Xu, Y.G., Menzies, M.A., Thirwall, M.F., Huang, X.L., Liu, Y., Chen, X.M.Reactive harzburgites from Huinan, NE China: products of the lithosphereGeochimica et Cosmochimica Acta, Vol. 67, 3, pp. 487-505.China, northeastHarzburgites
DS2003-1544
2003
Menzies, M.A.Zhang, H.F., Menzies, M.A., Mattey, D.Mixed mantle provenance diverse garnet compositions in polymict peridotitesEarth and Planetary Science Letters, Vol. 216, 3, pp. 329-46.South AfricaGeochemistry
DS200412-1302
2002
Menzies, M.A.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Volcanic rifted margins.Geological Society of America Special Paper, 362, 230p.GlobalBook - volcanism, tectonics
DS200412-1303
2002
Menzies, M.A.Menzies, M.A., Klemperer, S.L., Ebinger, C.J., Baker, J.Characteristics of volcanic rifted margins.Geological Society of America Special Paper, No, 362, pp. 1-14.TechnologyOverview
DS200412-2162
2003
Menzies, M.A.Xu, Y., Huang, X., Menzies, M.A., Wang, R.Highly magnesian olivines and green core clinopyroxenes in ultrapotassic lavas from western Yunnan China: evidence for a complexEuropean Journal of Mineralogy, Vol. 15, 6, pp. 965-75.ChinaAlkalic
DS200412-2202
2003
Menzies, M.A.Zhang, H.F., Menzies, M.A., Mattey, D.Mixed mantle provenance diverse garnet compositions in polymict peridotites, Kaapvaal Craton, South Africa.Earth and Planetary Science Letters, Vol. 216, 3, pp. 329-46.Africa, South AfricaGeochemistry
DS200712-0972
2007
Menzies, M.A.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
Menzies, M.A.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
DS201012-0243
2010
Menzies, M.A.Gonzaga, R.G., Lowry, D., Jacob, D.E., Le Roex, A., Schulze, D., Menzies, M.A.Eclogites and garnet pyroxenes: similarities and differences.Journal of Volcanology and Geothermal Research, Vol. 190, 1-2 pp. 235-247.TechnologyEclogite
DS201012-0244
2010
Menzies, M.A.Gonzaga, R.G., Menzies, M.A., Thirwala, M.F., Jacob, D.E., Le Roex, A.Eclogites and garnet pyroxenites: problems resolving provenance using Lu-Hf, Sm-Nd and Rb-Sr isotope systems.Journal of Petrology, Vol. 51, 1-2, pp. 513-535.MantleGeochronology
DS1982-0265
1982
Menzies.Hawkesworth, C.J., Rogers, N.W., Van calsteren, P.W., Menzies.Neodymium and Strontium Isotope Studies on Crustal Xenoliths from southernafrica.Proceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, P. 236, (abstract.).South Africa, LesothoKimberlite, Geochronology
DS1984-0349
1984
Menzies.Hawkesworth, C.J., Rogers, N.W., Van calsteren, P.W.C., Menzies.Mantle Enrichment ProcessesNature., Vol. 311, No. 6984, SEPT. 27TH. PP. 331-335.GlobalBasanite, Kimberlite, Genesis
DS201412-0572
2014
Meqbel, N.M.Meqbel, N.M., Egbert, G.D., Wannamaker, P.E., Kelbert, A., Schultz, A.Deep electrical resistivity structure of the northwestern US derived from 3-D inversion of USArray magnetotelluric data.Earth and Planetary Science Letters, Vol. 402, pp. 290-304.United StatesGeophysics - magnetotellurics
DS2001-0246
2001
Merabet, N.Derder, M.E.M., Henry, B., Merabet, N., Amenna, BouroisUpper Carboniferous paleomagnetic pole from the stable Saharan Craton and Gondwana reconstructions.Journal of African Earth Science, Vol. 32, No. 3, Apr. pp. 491-502.South AfricaGeophysics - paleomagnetism, Gondwanaland
DS2002-1049
2002
Merbom, A.Merbom, A., Sleep, N.H., Chamberlain, C.P., Coleman, R.G., Frei, R., HrenRe Os isotopic evidence for long lived heterogeneity and equilibration processes in Earth's upper mantle.Nature, No. 6900, Oct. 17, pp. 705-7.MantleGeochronology
DS202005-0729
2020
Mercadier, J.Decree, S., Cawthorn, G., Deloule, E., Mercadier, J., Frimmel, H., Baele, J-M.Unravelling the processes controlling apatite formation in the Phalaborwa Complex ( South Africa) based on combined cathodluminescence, LA-ICPMS and in-situ O and Sr isotope analyses.Contributions to Mineralogy and Petrology, Vol. 175, 34 31p. PdfAfrica, South Africacarbonatite

Abstract: The Phalaborwa world-class phosphate deposit (South Africa) is hosted by a Paleoproterozoic alkaline complex mainly composed of phoscorite, carbonatite, pyroxenitic rocks, and subordinate fenite. In addition, syenite and trachyte occur in numerous satellite bodies. New petrological and in-situ geochemical data along with O and Sr isotope data obtained on apatite demonstrate that apatite is in the principal host rocks (pyroxenitic rocks, phoscorite and carbonatite) formed primarily by igneous processes from mantle-derived carbonatitic magmas. Early-formed magmatic apatite is particularly enriched in light rare earth elements (LREE), with a decrease in the REE content ascribed to magma differentiation and early apatite fractionation in isolated interstitial melt pockets. Rayleigh fractionation favored a slight increase in d18O (below 1%) at a constant Sr isotopic composition. Intrusion of fresh carbonatitic magma into earlier-formed carbonatite bodies locally induced re-equilibration of early apatite with REE enrichment but at constant O and Sr isotopic compositions. In fenite, syenite and trachyte, apatite displays alteration textures and LREE depletion, reflecting interaction with fluids. A marked decrease in d18O in apatite from syenite and trachyte indicates a contribution from d18O-depleted meteoric fluids. This is consistent with the epizonal emplacement of the satellite bodies. The general increase of the Sr isotope ratios in apatite in these rocks reflects progressive interaction with the country rocks over time. This study made it possible to decipher, with unmatched precision, the succession of geological processes that led to one of the most important phosphate deposits worldwide.
DS202101-0007
2020
Mercadier, J.Decree, S., Savolainen, M., Mercadier, J., Debaille, V., Hohn, S., Frimmel, H., Baele, J-M.Geochemical and spectroscopic investigation of apatite in the Siilinjarvi carbonatite complex: keys to understanding apatite forming processes and assessing potential for rare earth elements.Applied Geochemistry, Vol. 123, 104778 17p. PdfEurope, Finlanddeposit - Siilinjarvi

Abstract: The Siilinjärvi phosphate deposit (Finland) is hosted by an Archean carbonatite complex. The main body is composed of glimmerite, carbonatite and combinations thereof. It is surrounded by a well-developed fenitization zone. Almost all the rocks pertaining to the glimmerite-carbonatite series are considered for exploitation of phosphate. New petrological and in-situ geochemical as well as spectroscopic data obtained by cathodoluminescence, Raman and laser-induced breakdown spectroscopy make it possible to constrain the genesis and evolution of apatite through time. Apatite in the glimmerite-carbonatite series formed by igneous processes. An increase in rare earth elements (REE) content during apatite deposition can be explained by re-equilibration of early apatite (via sub-solidus diffusion at the magmatic stage) with a fresh carbonatitic magma enriched in these elements. This late carbonatite emplacement has been known as a major contributor to the overall P and REE endowment of the system and is likely connected to fenitization and alkali-rich fluids. These fluids - enriched in REE - would have interacted with apatite in the fenite, resulting in an increase in REE content through coupled dissolution-reprecipitation processes. Finally, a marked decrease in LREE is observed in apatite hosted by fenite. It highlights the alteration of apatite by a REE-poor fluid during a late-magmatic/hydrothermal stage. Regarding the potential for REE exploitation, geochemical data combined with an estimation of the reserves indicate a sub-economic potential of REE to be exploited as by-products of phosphate mining. Spectroscopic analyses further provide helpful data for exploration, by determining the P and REE distribution and the enrichment in carbonatite and within apatite.
DS1994-1171
1994
Mercaldo, E.L.Mercaldo, E.L.Negotiating international agreementsCanadian Institute 1994 Canadian Mining Symposium, Preprint, 11pGlobalEconomics, Mining industry -agreements
DS201112-0667
2011
Mercer, B.Mercer, B.Health and safety in mineral exploration - the role of the Prospectors and Developers Association of Canada. Freely available as part of E3 Plus Initiative.Yellowknife Geoscience Forum Abstracts for 2011, abstract p. 62-63.GlobalManual for health and safety - not specific to diamond
DS200912-0086
2008
Mercer, C.Bunch, T.E., Wittke, J.H., West, A., Kennett, J.P., Ouq Hee, S.S., Wolbach, W.S., Stich, A., Mercer, C., WeaverHexagonal diamonds ( lonsdaleite) discovered in the K/T impact layer in Spain and New Zealand.American Geological Union, Fall meeting Dec. 15-19, Eos Trans. Vol. 89, no. 53, meeting supplement, 1p. abstractEurope, Spain, New ZealandNanodiamonds
DS201412-0460
2014
Mercer, C.Kinzie, C.R., Que Hee, S.S., Stich, A., Tague, K.A., Mercer, C., Razink, J.J., Kennett, D.J., DeCarli, P.S., Bunch, T.E., Wittke, J.H., Israde-Alcantara, I., Bischoff, J.L., Goodyear, A.C., Tankersley, K.B., Kimbel, D.R., Culleton, B.J., Erlandson, J.M.Nanodiamond rich layer across three continents consistent with major cosmic impact at 12,800 Cal BP Journal of Geology, Vol 122, 5, pp. 475-506.Global, GreenlandNanodiamonds
DS201502-0069
2014
Mercer, C.Kinzie, C.R., Que Hee, S.S., Stich, A., Tague, K.A., Mercer, C., Razink, J.J., Kennett, D.J., DeCarli, P.S., Bunch, T.E., Wittke, J.H., Israde-Alantara, I., Bischoff, J.L., Goodyear, A.C., Tankersley, K.B., Kimbel, D.R., Culleton, B.J., Erlandson, J.M.Nanodiamond-rich layer across three continents consistent with major cosmic impact at 12,800 Cal BP.Journal of Geology, Vol. 122, Sept. pp. 475-506.South America, BrazilNanodiamonds
DS201112-0941
2011
Mercer, J.A.Sharp, Z.D., Selverstone, J., Mercer, J.A.The Cl isotope composition of the mantle revisited.Goldschmidt Conference 2011, abstract p.1848.Canada, Northwest TerritoriesCl bearing diamonds
DS1940-0040
1942
Mercer, M.Austin, A.C., Mercer, M.The Story of DiamondsSanta Monica: Gemological Institute of America., 101P.South Africa, GlobalKimberley, History
DS1860-0903
1895
Mercer, T.Mercer, T.Speculations on the Origin and Formation of Diamond with Special Reference to its Formation and Position at Bingara, New South Wales.Australasian Institute of Mining And Metallurgy. Transactions, Vol. 3, PP. 56-70.Australia, New South WalesDiamond genesis
DS201112-0561
2011
Mercer etcKurbatov, 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
DS200912-0494
2009
Merchant Research and Consulting Ltd.Merchant Research and Consulting Ltd.Prices for synthetic diamond products to decline according to Merchant Research & Consulting ltd.Yahoo Finance, July 27, 1p.GlobalNews item - diamond synthetics
DS1991-0971
1991
Mercier, D.Ledru, P., Lasserre, J-L., Manier, E., Mercier, D.The lower Proterozoic of northern Guiana: a revision of the lithology, transcurrent tectonics and sedimentary basin dynamicsBulletin Societe Geologique France, Vol. 162, No. 4, pp. 627-636GlobalBasin, Tectonics
DS1989-1009
1989
Mercier, E.Mercier, E.Evenements tectoniques d'origine compressive dans le Proterozoique du Nordde la Cordillere canadienne (montagnes Ogilvie, Yukon).(in French) #1Canadian Journal of Earth Sciences, Vol. 26, pp. 199-205.YukonOgilvie Mountains, Tectonics
DS1989-1010
1989
Mercier, E.Mercier, E.Evenements tectoniques d'origine compressive dans le Proterozoique du nordde la Cordillere Canadienne #2Canadian Journal of Earth Sciences, (in French), Vol. 26, No. 1, January pp. 199-205YukonProterozoic, Tectonics
DS1970-0560
1972
Mercier, J.C.C.Mercier, J.C.C.Structures des Peridotites En Enclaves dans Quelques Basaltes D'europe et D'hawaii: Regards sur la Constitution du Manteau Superieur.Ph.d. Thesis, University Nantes, 229P.GlobalTexture, Fabric, Strain Analysis
DS1985-0058
1985
Mercier, J.C.C.Benoit, V., Mercier, J.C.C.Hydrous Peridotites in the 'pseudokimberlites' from the Colorado Plateau.Terra Cognita., Vol. 5, No. 2-3, SPRING-SUMMER P. 316. (abstract). ABSTRACT VOLUnited States, Colorado PlateauMineral Chemistry, Metamorphism
DS1985-0059
1985
Mercier, J.C.C.Benoit, V., Mercier, J.C.C.Hydrated Garnet Bearing Peridotite Xenoliths from the Colorado Plateau.Terra Cognita., Vol. 5, No. 4, AUTUMN P. 441, (abstract.).United States, Colorado PlateauMinettes, Geochemistry
DS1986-0065
1986
Mercier, J.C.C.Benoit, V., Mercier, J.C.C.Les enclaves ultramafiques du volcanisme alcalin tertiare ducentre du plateau du Colorado: implications techniquesBulletin. Soc. Geol. de France (FRE), Vol. 8, No.6, pp. 1015-1023ColoradoUSA, Alkaline rocks
DS1988-0099
1988
Mercier, J.C.C.Cabanes, N., Mercier, J.C.C.Insight into the upper mantle beneath an active extensional zone- the spinel peridotite xenoliths from San-Quintin (BajaCalifornia, Mexico)Contributions to Mineralogy and Petrology, Vol. 100, No. 3, pp. 374-382California, MexicoMantle, Xenoliths
DS1988-0100
1988
Mercier, J.C.C.Cabanes, N., Mercier, J.C.C.Mineral chemistry and equilibrium conditions of the spinel lherzolite xenoliths from Monferrier southern France.(in French)Bulletin. de Mineralogie, (in French), Vol. 111, No. 1, Jan-Feb, pp. 65-78FranceBlank
DS1992-1708
1992
Mercier, J.C.C.Xu, Y.G., Mercier, J.C.C., Ross, J.V., Lin, C.Y., Shi, L.B.A first insight into the upper mantle beneath a lithospheric fault zone:the spinel-lherzolite xenoliths from Yitong bsalts, north-eastern ChinaInternational Symposium Cenozoic Volcanic Rocks Deep seated xenoliths China and its, Abstracts pp. 102ChinaMantle, Xenoliths
DS1993-1784
1993
Mercier, J.C.C.Xu, YG., Ross, J.V., Mercier, J.C.C.The upper mantle beneath the continental rift of Tanlu, eastern China-evidence for the intra-lithospheric shear zones.Tectonophysics, Vol. 225, No. 4, October 30, pp. 337-360.ChinaMantle, Tectonics -rifting
DS2003-0292
2003
Mercier, J.C.C.Coussaert, N., Gregoire, M., Mercier, J.C.C., Bell, D.R., Demaiffe, D., Le RoexThe origin of clinopyroxene in cratonic mantle8ikc, Www.venuewest.com/8ikc/program.htm, Session 4, POSTER abstractSouth AfricaMantle geochemistry, Deposit - Bultfontein, Jagersfontein, Monastery, Premie
DS200412-0546
2004
Mercier, J.C.C.Femenias, O., Coussaert, N., Berger, J., Mercier, J.C.C., Demaiffe, D.Metasomatism and melting history of a Variscan lithospheric mantle domain: evidence from the Puy Beaunit xenoliths ( French MassContributions to Mineralogy and Petrology, Vol. 148, 1, pp. 13-28.Europe, FranceXenoliths
DS200712-0074
2007
Mercier, J.C.C.Bernstein, J., Fermenias, O., Coussaert, N., Mercier, J.C.C., Demaiffe, D.Consistent olivine Mg in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene.Geology, Vol. 35, 5, pp. 459-462.MantleMelting
DS1996-1573
1996
Mercier, J.C-C.Xu, Y., Mercier, J.C-C., Shi, L.Potassium rich glass bearing wehrlite xenoliths from Yitong: petrological and chemical evidence mantle MetasomatismContributions to Mineralogy and Petrology, Vol. 125, No. 4, pp. 406-17.ChinaMantle Metasomatism, Xenoliths
DS200912-0495
2009
Mercier, J.P.Mercier, J.P., Bostock, M.G., Cassidy, J.F., Dueker, K., Gaherty, J.B., Garnero, E.J., Revenaugh, ZandtBody wave tomography of western Canada.Tectonophysics, Vol. 475, 2, pp. 480-492.Canada, Alberta, British Columbia, Northwest TerritoriesGeophysics - seismics
DS2003-0293
2003
Mercier, J-C.Coussaert, N., Mercier, J-C., Demaiffe, D., Andre, L.Equilibrium conditions revisited for Lesotho kimberlites8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, AbstractLesothoMantle petrology, Pyroxene geothermometry
DS2003-0403
2003
Mercier, J-C.Femencias, O., Coussaert, N., Bingen, B., Whitehouse, M., Mercier, J-C.A Permian underplating event in late to post orogenic tectonic setting. Evidence fromChemical Geology, Vol. 199, 3-4, Sept. 15, pp. 293-315.EuropeLherzolite, crust mantle boundary
DS200412-0379
2003
Mercier, J-C.Coussaert, N., Mercier, J-C., Demaiffe, D., Andre, L.Equilibrium conditions revisited for Lesotho kimberlites.8 IKC Program, Session 6, AbstractAfrica, LesothoMantle petrology, pyroxxene geothermometry
DS200412-0545
2003
Mercier, J-C.Femencias, O., Coussaert, N., Bingen, B., Whitehouse, M., Mercier, J-C., Demaiffe, D.A Permian underplating event in late to post orogenic tectonic setting. Evidence from the mafic-ultramafic layered xenoliths froChemical Geology, Vol. 199, 3-4, Sept. 15, pp. 293-315.EuropeLherzolite, crust mantle boundary
DS201506-0288
2015
Mercier, J-C.Nkono, C., Femenias, O., Lene, A., Mercier, J-C., Ngounouno, F.Y., Demaiffe, D.Relationship between the fractal dimension of orthopyroxene distribution and the temperature in mantle xenoliths.Geological Journal, in press availableRussia, PolandXenoliths
DS200812-0740
2008
Mercier, J-P.Mercier, J-P., Bostock, M.G., Audet, P., Gaherty, J.B., Garnero, E.J., Revenaugh, J.The teleseismic signature of fossil subduction: northwestern Canada. (part of Lithoprobe)Journal of Geophysical Research, Vol. 113, B 04308Canada, Northwest TerritoriesGeophysics - seismics
DS201412-0833
2014
Mercier, J-P.Singh, A., Mercier, J-P., Ravi Kumar, M., Srinagesh, D., Chadha, R.K.Continental scale body wave tomography of India: evidence for attrition and preservation of lithospheric roots.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, 3, pp. 658-675.IndiaGeophysics - seismics
DS201710-2248
2017
Mercier-Langevin, P.Mercier-Langevin, P.Mineral deposits of Canada: a compilation (1905-2016)Society of Economic Geologists, CD of 1,460 papers. $ 150.00Canadamineral deposits
DS1960-0383
1963
Mercy, E.L.P.O'hara, M.J., Mercy, E.L.P.Petrology and Petrogenesis of Some Garnetiferous PeridotitesRoyal Society. EDINBURGH EARTH SCI. SECT. Transactions, Vol. 65, PP. 251-314.South AfricaGeology, Garnets
DS1960-0579
1965
Mercy, E.L.P.Mercy, E.L.P., O'hara, M.J.Chemistry of Some Garnet Bearing Rocks from the South Norwegian Peridotites.Norske Geol. Tidsskr., Vol. 45, PP. 323-332.Norway, ScandinaviaGeochemistry
DS1960-0580
1965
Mercy, E.L.P.Mercy, E.L.P., O'hara, M.J.Olivines and Orthopyroxenes from Garnetiferous Peridotites And Related Rocks.Norske Geol. Tidsskr., Vol. 45, PP. 457-461.Norway, ScandinaviaPetrography
DS1960-0724
1966
Mercy, E.L.P.O'hara, M.J., Mercy, E.L.P.Exceptionally Calcic Pyralspite from South African Kyanite Eclogite.Nature., Vol. 212, No. 5057, PP. 68-69.South AfricaRoberts Victor Mine, Mineralogy
DS1975-0153
1975
Mercy, E.L.P.O'hara, M.J., Saunders, M.J., Mercy, E.L.P.Garnet Peridotite, Primary Ultrabasic Magmas and Eclogites:interpretation of Upper Mantle Processes in Kimberlite.Physics and Chemistry of the Earth., Vol. 9, PP. 571-604.South AfricaPetrology
DS1960-0725
1966
Mercy, E.L.R.O'hara, M.J., Mercy, E.L.R.Peridotite and Pyrope from the Navajo Country, Arizona and New Mexico.American MINERALOGIST., Vol. 51, No. 3-4, PP. 336-352.GlobalDiatreme
DS201705-0854
2017
Merdith, A.S.Merdith, A.S., Collins, A.S., Williams, S.E., Pisarevsky, S., Foden, J.F., Archibald, D., Blades, M.L., Alessio, B.L., Armistead, S., Plavsa, D., Clark, C., Muller, R.D.A full plate global reconstruction of the Neoproterozoic.Gondwana Research, in press available 155p.Gondwana, RodiniaGeodynamics

Abstract: Neoproterozoic tectonic geography was dominated by the formation of the supercontinent Rodinia, its break-up and the subsequent amalgamation of Gondwana. The Neoproterozoic was a tumultuous time of Earth history, with large climatic variations, the emergence of complex life and a series of continent-building orogenies of a scale not repeated until the Cenozoic. Here we synthesise available geological and palaeomagnetic data and build the first full-plate, topological model of the Neoproterozoic that maps the evolution of the tectonic plate configurations during this time. Topological models trace evolving plate boundaries and facilitate the evaluation of “plate tectonic rules” such as subduction zone migration through time when building plate models. There is a rich history of subduction zone proxies preserved in the Neoproterozoic geological record, providing good evidence for the existence of continent-margin and intra-oceanic subduction zones through time. These are preserved either as volcanic arc protoliths accreted in continent-continent, or continent-arc collisions, or as the detritus of these volcanic arcs preserved in successor basins. Despite this, we find that the model presented here still predicts less subduction (ca. 90%) than on the modern earth, suggesting that we have produced a conservative model and are likely underestimating the amount of subduction, either due to a simplification of tectonically complex areas, or because of the absence of preservation in the geological record (e.g. ocean-ocean convergence). Furthermore, the reconstruction of plate boundary geometries provides constraints for global-scale earth system parameters, such as the role of volcanism or ridge production on the planet's icehouse climatic excursion during the Cryogenian. Besides modelling plate boundaries, our model presents some notable departures from previous Rodinia models. We omit India and South China from Rodinia completely, due to long-lived subduction preserved on margins of India and conflicting palaeomagnetic data for the Cryogenian, such that these two cratons act as ‘lonely wanderers’ for much of the Neoproterozoic. We also introduce a Tonian-Cryogenian aged rotation of the Congo-São Francisco Craton relative to Rodinia to better fit palaeomagnetic data and account for thick passive margin sediments along its southern margin during the Tonian. The GPlates files of the model are released to the public and it is our expectation that this model can act as a foundation for future model refinements, the testing of alternative models, as well as providing constraints for both geodynamic and palaeoclimate models.
DS201709-2032
2017
Meredith, A.S.Meredith, A.S., Collins, A.S., Williams, S.E., Pisarevsky, S., Foden, J.D., Archibald, D.B., Blades, M.L., Alessio, B.L., Armistead, S., Plavsa, D., Clark, C., Muller, R.D.A full plate global reconstruction of the Neoproterozoic.Gondwana Research, Vol. 50, pp. 84-134.Globalneoproterozoic

Abstract: Neoproterozoic tectonic geography was dominated by the formation of the supercontinent Rodinia, its break-up and the subsequent amalgamation of Gondwana. The Neoproterozoic was a tumultuous time of Earth history, with large climatic variations, the emergence of complex life and a series of continent-building orogenies of a scale not repeated until the Cenozoic. Here we synthesise available geological and palaeomagnetic data and build the first full-plate, topological model of the Neoproterozoic that maps the evolution of the tectonic plate configurations during this time. Topological models trace evolving plate boundaries and facilitate the evaluation of “plate tectonic rules” such as subduction zone migration through time when building plate models. There is a rich history of subduction zone proxies preserved in the Neoproterozoic geological record, providing good evidence for the existence of continent-margin and intra-oceanic subduction zones through time. These are preserved either as volcanic arc protoliths accreted in continent-continent, or continent-arc collisions, or as the detritus of these volcanic arcs preserved in successor basins. Despite this, we find that the model presented here still predicts less subduction (ca. 90%) than on the modern earth, suggesting that we have produced a conservative model and are likely underestimating the amount of subduction, either due to a simplification of tectonically complex areas, or because of the absence of preservation in the geological record (e.g. ocean-ocean convergence). Furthermore, the reconstruction of plate boundary geometries provides constraints for global-scale earth system parameters, such as the role of volcanism or ridge production on the planet's icehouse climatic excursion during the Cryogenian. Besides modelling plate boundaries, our model presents some notable departures from previous Rodinia models. We omit India and South China from Rodinia completely, due to long-lived subduction preserved on margins of India and conflicting palaeomagnetic data for the Cryogenian, such that these two cratons act as ‘lonely wanderers’ for much of the Neoproterozoic. We also introduce a Tonian-Cryogenian aged rotation of the Congo-São Francisco Craton relative to Rodinia to better fit palaeomagnetic data and account for thick passive margin sediments along its southern margin during the Tonian. The GPlates files of the model are released to the public and it is our expectation that this model can act as a foundation for future model refinements, the testing of alternative models, as well as providing constraints for both geodynamic and palaeoclimate models.
DS201906-1323
2019
Meredith, A.S.Meredith, A.S., Williams, S.E., Brune, S., Collins, A.S., Muller, R.D.Rift and boundary evolution across two supercontinent cycles. Gondwana, RodiniaGlobal and Planetary Change, Vol. 173, pp. 1-14.Globalplate tectonics

Abstract: The extent of continental rifts and subduction zones through deep geological time provides insights into the mechanisms behind supercontinent cycles and the long term evolution of the mantle. However, previous compilations have stopped short of mapping the locations of rifts and subduction zones continuously since the Neoproterozoic and within a self-consistent plate kinematic framework. Using recently published plate models with continuously closing boundaries for the Neoproterozoic and Phanerozoic, we estimate how rift and peri-continental subduction length vary from 1 Ga to present and test hypotheses pertaining to the supercontinent cycle and supercontinent breakup. We extract measures of continental perimeter-to-area ratio as a proxy for the existence of a supercontinent, where during times of supercontinent existence the perimeter-to-area ratio should be low, and during assembly and dispersal it should be high. The amalgamation of Gondwana is clearly represented by changes in the length of peri-continental subduction and the breakup of Rodinia and Pangea by changes in rift lengths. The assembly of Pangea is not clearly defined using plate boundary lengths, likely because its formation resulted from the collision of only two large continents. Instead the assembly of Gondwana (ca. 520 Ma) marks the most prominent change in arc length and perimeter-to-area ratio during the last billion years suggesting that Gondwana during the Early Palaeozoic could explicitly be considered part of a Phanerozoic supercontinent. Consequently, the traditional understanding of the supercontinent cycle, in terms of supercontinent existence for short periods of time before dispersal and re-accretion, may be inadequate to fully describe the cycle. Instead, either a two-stage supercontinent cycle could be a more appropriate concept, or alternatively the time period of 1 to 0 Ga has to be considered as being dominated by supercontinent existence, with brief periods of dispersal and amalgamation.
DS200512-0717
2004
Meredith, G.Meredith, G.Canada's northern diamonds ... from rocks to riches. Great resource aimed at children grades 5/6.Northern_ink @theedge.ca, $22.95 46 pages well illustrated and educationalCanada, Northwest TerritoriesBook - children knowledge,supports NWT literacy council
DS200512-0718
2005
Meredith, M.Meredith, M.The fate of Africa: from the hopes of freedom to the heart of despair; a history of 50 years of independence.Public Affairs, Amazon.com, Publ. July, 752p. approx. $ 25.00AfricaBook - history, economics
DS1992-1324
1992
Meredith, P.G.Sammonds, P.R., Meredith, P.G., Main, I.G.Role of pore fluids in the generation of seismic precursors to shearfractureNature, Vol. 359, No. 6392, September 17, p. 228-230GlobalCrust deformation, Geophysics -seismics
DS1860-0250
1875
Merensky, A.Merensky, A.Original Map of the Transvaal Republic Showing the Gold And diamond Fields.Berlin:, 1:1, 850, 000Africa, South Africa, Cape ProvinceRegional Geology
DS1900-0264
1904
Merensky, H.Merensky, H.Technical Report on the Premier Diamond MineSouth Africa Mines Commerce and Industry, Vol. 2, SEPT. 10TH., PP. 582-584.Africa, South AfricaPremier Mine
DS1900-0432
1906
Merensky, H.Merensky, H.Report on the Voorspoed Diamond MineSouth Africa Mines Commerce and Industry, Vol. 4, PT. 2, SEPT. 8TH. PP. 5-6.Africa, South AfricaGeology, Kimberlite Mines And Deposits, Kroonstad Area
DS1900-0583
1907
Merensky, H.Merensky, H.The Origin of Diamonds Within the Area of the Vaal RiverGeological Society of South Africa Transactions, Vol. 10, PP. 107-111. ALSO: Mining Engineering Journal of South Africa, Vol.Africa, South AfricaAlluvial Diamond Placers, Diamond Genesis
DS1900-0691
1908
Merensky, H.Merensky, H.Erwiderung Auf Einige Ausfuehrungen des Herrn Dr. Voit in Seinem Aufsatz " Nutzbare Lagerstaette Sued-afrikas".Zeitschr. F. Prakt. Geol., Vol. 16, PP. 346-347.Africa, South AfricaGeology, Diamond
DS1900-0692
1908
Merensky, H.Merensky, H.Diamanten in Diabasen. #2Zeitschr. F. Prakt. Geol., Vol. 16, P. 344-346.Africa, South AfricaNon-kimberlitic Source Rocks
DS1900-0693
1908
Merensky, H.Merensky, H.Neue Festellungen Ueber das Vorkommen von Diamanten in Diabasen und Pegmatiten.Zeitschr. F. Prakt. Geol., Vol. 16, PP. 155-158. ALSO: CHEM. abstract., Vol. 2, P. 1951; IAfrica, South AfricaNon-kimberlitic Source Rocks
DS1900-0787
1909
Merensky, H.Merensky, H.Geological Observations in the Lace Diamond Mine Now Known As the Crown Diamond Mine.Geological Society of South Africa Transactions, Vol. 12, PP. 203-204.Africa, South AfricaGeology, Kimberlite Mines And Deposits
DS1900-0788
1909
Merensky, H.Merensky, H.The Diamond Deposits of Luderitzland German Southwest AfricGeological Society of South Africa Transactions, Vol. 12, PP. 13-23.Africa, NamibiaGeology, Marine Diamond Placers
DS1900-0789
1909
Merensky, H.Merensky, H.Die Diamant vorkommen in LuderitzlandZeitschr. F. Prakt. Geol., Vol. 17, PP. 122-129.Africa, NamibiaGeology, Marine Diamond Placers
DS1900-0790
1909
Merensky, H.Merensky, H.Vorlaufige Kurze Mitteilungen Ueber das Diamant vorkommen Bei Luderitzbucht.Zeitschr. F. Prakt. Geol., Vol. 17, PP. 79-80.Africa, NamibiaGeology, Marine Diamond Placers
DS1920-0344
1927
Merensky, H.Merensky, H.Warum Muessen die Diamant Vorkommen in der Sogenannten 'river and Oyster' Linie Bei Alexander Bay Zum Teil Moeglichst Schnell Ausgearbeitet werden?Unknown., South AfricaLittoral Diamond Placers, Oyster Line
DS1920-0345
1927
Merensky, H.Merensky, H.How I Found the Richest Diamond Fields in the WorldMin. Ind. Magazine (johannesburg), Vol. 4, MAY 18TH. PP. 267-268.South Africa, Namaqualand CoastMarine Diamond Placers, History, Alexander Bay, Oyster Line
DS1920-0394
1928
Merensky, H.Merensky, H.The Discovery of the Namaqualand Diamonds #1Min. Ind. Magazine (johannesburg), Vol. 6, PP. 435-439.South AfricaHistory, Marine Diamond Placers
DS1920-0411
1928
Merensky, H.Wagner, P.A., Merensky, H.The Diamond Deposits on the Coast of Little NamaqualandGeological Society of South Africa Transactions, Vol. 31, PP. 1-41.South AfricaMarine Diamond Placers
DS1920-0412
1928
Merensky, H.Wagner, P.A., Merensky, H.Namaqualand Coastal DiamondsMining Engineering Journal of South Africa, Vol. 39, PT. 1, No. 1911, PP. 285-286; PT. 1, No. 1912, PP.South AfricaMarine Diamond Placers, Diamond Genesis
DS1920-0457
1929
Merensky, H.Merensky, H.The Discovery of the Namaqualand Diamonds #4Min. Ind. Magazine (johannesburg), Jan. 9TH.South AfricaHistory
DS1920-0458
1929
Merensky, H.Merensky, H.The Discovery of the Namaqualand Diamonds #3Mining Engineering Journal of South Africa YEARBOOK, PP. 185-191.South Africa, Namaqualand CoastHistory
DS1930-0033
1930
Merensky, H.Merensky, H.Report on the Diamondiferous Terraces North of the Orange River Mouth.Unknown., Southwest Africa, NamibiaLittoral Diamond Placers, Oyster Line
DS1970-0354
1971
Mereu, R.F.Mereu, R.F., Jobidon, G.A Seismic Investigation of the Crust and Moho on a Line Perpendicular to the Grenville Front.Canadian Journal of Earth Sciences, Vol. 8, PP. 1553-1583.GlobalMid-continent
DS1987-0320
1987
Mereu, R.F.Jianjun Wu, Mereu, R.F.Analysis of the results of the Kapuskasing seismic experimentEos, abstractOntarioTectonics
DS1989-1011
1989
Mereu, R.F.Mereu, R.F., Mueller, S., Fountain, D.M.Properties and processes of earth's lower crustAmerican Geophysical Union (AGU) Geophysical Monograph Series, No. GM 51/IUGG 6, 352p. ISBN 0-87590-456-4 @ 32.00GlobalMantle
DS1989-1658
1989
Mereu, R.F.Wu, Jianjun, Mereu, R.F.A combined P-S wave and gravity interpretation of thedat a from the Kapuskasking experimentGeological Association of Canada (GAC) Annual Meeting Program Abstracts, Vol. 14, p. A102. (abstract.)OntarioTectonics, Kapuskasing Lithoprobe
DS1990-0637
1990
Mereu, R.F.Halchuk, S.C., Mereu, R.F.A seismic investigation of the crust and Moho underlying the Peace RiverArch, CanadaTectonophysics, Vol. 185, No. -12, December 20, pp. 1-20Alberta, SaskatchewanGeophysics -seismics, Peace River Arch
DS1990-0762
1990
Mereu, R.F.Jianjun Wu, Mereu, R.F.The nature of the Kapuskasing structural zone: results from the 1984seismic refraction experimentExposed cross sections of the Continental Crust, ed. M.H. Salisbury and, pp. 563-586OntarioKapuskasing zone, Tectonics
DS1990-1589
1990
Mereu, R.F.Wu, J., Mereu, R.F.Seismic reflectivity patterns of the Kapuskasing structural zoneTerra, Abstracts of Deep Seismic reflection profiling of the Continental, Vol. 2, December abstracts p. 207OntarioGeophysics -seismics, Kapuskasing zone
DS1991-0449
1991
Mereu, R.F.Epili, D., Mereu, R.F.The Grenville front tectonic zone: results from the 1986 Great Lakes onshore seismic wide-angle reflection and refraction experimentJournal of Geophysical Research, Vol. 96, No. B 10, September 10, pp. 16, 335-16, 348Ontario, Great LakesTectonics, Geophysics -seismics
DS1991-1132
1991
Mereu, R.F.Mereu, R.F., Percival, J.A., Mareschal, M., Salisbury, M.H.Collaborative special project to identify seismic reflectors in high grade metamorphic rocks of the Kapuskasing UpliftCan. Cont. Drilling Project, August 40pOntarioGeophysics -seismics, Kapuskasing Zone
DS1992-0790
1992
Mereu, R.F.Jianjun Wu, Mereu, R.F.Crustal structure of the Kapuskasing Uplift from Lithoprobe nearvertical/wide angle seismic reflection dataJournal of Geophysical Research, Vol. 97, No. B12, November 10, pp. 17, 411-17, 453OntarioGeophysics -seismics, LITHOPROBE.
DS1992-0791
1992
Mereu, R.F.Jianjun Wu, Mereu, R.F.Crustal structure of the Kapuskasing uplift from LITHOPROBE near vertical/wide angle seismic reflection dataJournal of Geophysical Research, Vol. 97, No. B12, November 10, pp. 17, 441-17, 453OntarioKapuskasing Zone, Lithoprobe
DS1992-0792
1992
Mereu, R.F.Jianjun Wu, Mereu, R.F., Percival, J.A.Seismic image of the Ivan hoe Lake fault zone in the Kapuskasing uplift Of the Canadian shieldGeophysical Research Letters, Vol. 19, No. 4, February 21, pp. 353-360OntarioStructure -fault, Geophysics -seismics
DS1997-1264
1997
Mereu, R.F.Winardhi, S., Mereu, R.F.Crustal velocity structure of the Superior and Grenville provinces of the southeastern Canadian ShieldCanadian Journal of Earth Sciences, Vol. 34, No. 8, August pp. 1167-84.Ontario, QuebecGeophysics - seismics, Tectonics
DS2000-0654
2000
Mereu, R.F.Mereu, R.F.The complexity of the crust and Moho under the southeastern Superior and Grenville provinces...Canadian Journal of Earth Sciences, Vol.37, No.2-3, Feb.Mar, pp.439-58.Ontario, QuebecTectonics - geodynamics, Canadian Shield
DS1985-0440
1985
Merexhko, YU.I.Merexhko, YU.I., Nesterov, A.N.Boundary Conditions for the Phase Transformation of Carbon In the Diamond Stability Field.Zhur. Fiz. Khim., Vol. 59, No. 6, PP. 1527-1528.RussiaDiamond Crystallography, Morphology
DS1986-0563
1986
MerezhkoMerezhko, YiBoundaries of diamond metastable zone formation in the graphite stability range in the metal carbon system (Technical Note).(Russian)Zhurn. Fiz. Khim., (Russian), Vol. 60, No. 5, pp. 1250-1251RussiaDiamond morphology
DS1984-0549
1984
Merezhko, Y.I.Nesterov, A.N., Merezhko, Y.I., et al.Boundary of Metastable Domains of Diamond FormationFiz. Khimiy. Zhurn., Vol. 58, No. 9, SEPTEMBER PP. 2173-2175.GlobalDiamond Morphology, Crystallography
DS1985-0441
1985
Merezhko, Y.I.Merezhko, Y.I., Nesterov, A.N.Boundary Conditions of Carbon Phase Transformations in the Diamond Stability Domain.Zhur. Fiz. Khim., Vol. 59, No. 6, JUNE PP. 1527-1528.RussiaBlank
DS200412-0937
2004
Merger, K.Jung, S., Merger, K., Hoernes, S.Shear zone related syenites in the Damara belt ( Namibia): the role of crustal contamination and source composition.Contributions to Mineralogy and Petrology, Vol. 148, 1, pp. 104-121.Africa, NamibiaGeneral geology - not specific to diamonds
DS200612-0074
2006
Mergoil, D.J.Bailey, K., Kearns, S., Mergoil, J., Mergoil, D.J., Paterson, B.Extensive dolomitic volcanism through the Limagne Basin, central France: a new form of carbonatite activity.Mineralogical Magazine, Vol. 70, 2, April, pp. 231-236.Europe, France, Spain, Africa, ZambiaNephelinite, kimberlite, peperite, carbonatite
DS2003-0243
2003
Mergoil, J.Chazot, G., Bertrand, H., Mergoil, J., Sheppard, S.M.F.Mingling of immiscible dolomite carbonatite and trachyte in tuffs from the MassifJournal of Petrology, Vol. 44, 10, pp. 1917-36.FranceCarbonatite
DS200412-0315
2003
Mergoil, J.Chazot, G., Bertrand, H., Mergoil, J., Sheppard, S.M.F.Mingling of immiscible dolomite carbonatite and trachyte in tuffs from the Massif Central, France.Journal of Petrology, Vol. 44, 10, pp. 1917-36.Europe, FranceCarbonatite
DS200612-0074
2006
Mergoil, J.Bailey, K., Kearns, S., Mergoil, J., Mergoil, D.J., Paterson, B.Extensive dolomitic volcanism through the Limagne Basin, central France: a new form of carbonatite activity.Mineralogical Magazine, Vol. 70, 2, April, pp. 231-236.Europe, France, Spain, Africa, ZambiaNephelinite, kimberlite, peperite, carbonatite
DS1940-0205
1949
Merh, S.Dubey, V.S., Merh, S.Diamondiferous Plug of Majhgawan in Central IndiaGeol. Min. Met. Soc. India Quarterly Journal, Vol. 21, PP. 1-6.India, Madhya PradeshGeology
DS1950-0111
1952
Merh, S.Merh, S.Further Study of the Majhgawan Diamond Mine, Panna StateQuarterly Journal of Geology MIN. MET. SOC. INDIA., Vol. 24, PP. 125-132.India, Madhya PradeshGeology
DS1950-0187
1954
Merh, S.Merh, S.On the Occurrence, Origin and Age of the Diamond Mine, Panna State, Central India.Indian Sci. Congr. 41st. Session Proceedings, ABSTRACT.India, Madhya PradeshBlank
DS1998-0997
1998
Meriaux, C.Meriaux, C., Agnon, A., Lister, J.R.The thermal signature of subducted lithospheric slabs at the core mantleboundary.Earth and Planetary Science Letters, Vol. 160, No. 3-4, Aug. 1, pp. 551-562.MantleSubduction, Boundary
DS1999-0472
1999
Meriaux, C.Meriaux, C., Lister, J.R., Agnon, A.Dike propagation with distributed damage of the host rockEarth and Planetary Science Letters, Vol. 165, No. 2, Jan. 30, pp. 177-86.GlobalDike, Tectonics
DS200512-0516
2004
Meriaux, C.Kerr, R.C., Meriaux, C.Structure and dynamics of sheared mantle plumes.Geochemistry, Geophysics, Geosystems: G3, Vol. 5, pp. Q12009 10.1029/2004 GC000749MantleTectonophysics, geodynamics, convection
DS200812-0559
2008
Meriaux, C.Kerr, R.C., Meriaux, C., Lister, J.R.Effect of thermal diffusion on the stability of strongly tilted mantle plume tails.Journal of Geophysical Research, Vol. 113, B9, B09401.MantleGeothermometry
DS1980-0124
1980
Meridian Oil NL.Fehlberg, B., Meridian Oil NL.Progress and Final Reports on El 545 Ooldea Area, South Australia.South Australia Open File., No. E3794, 18P. UNPUBL.Australia, South AustraliaProspecting, Geophysics, Airborne Magnetics, Ground, Gravity
DS1983-0402
1983
Merigoux, H.Leung, C.S., Merigoux, H., Poirot, J.P., Zecchini, P.Identification of precious stones and synthesis by infraredspectroscopy.(in French)Revue de Gemmologie, (in French), Vol. 75, pp. 14-15GlobalSpectroscopy
DS1989-0950
1989
Merigoux, H.Martin, F., Merigoux, H., Zecchini, P.Reflectance infrared spectroscopy in gemologyGems and Gemology, Vol. 25, No. 4, Winter pp. 226-231GlobalSpectroscopy, Mineral species -general
DS1996-0947
1996
Mering, C.Mering, C., Huaman-Rodrigo, D., Guillande, R.New dat a on the geodynamics of southern Peru from computerized analysis of SPOT and SAR ERS 1 imagesTectonophysics, Vol. 259, No. 1-3, June 30, pp. 153-170PeruGeodynamics, Remote sensing
DS1997-0833
1997
Merino, E.Nahon, D., Merino, E.Pseudomorphic replacement in tropical weathering: evidence, geochemicalconsequences, kinetic-rheology..American Journal of Science, Vol. 297, No. 4, April pp. 393-417GlobalWeathering, alluvials, Geochemistry
DS200512-1063
2005
MerkelSueda, 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
DS1975-0343
1976
Merkel, G.A.Merkel, G.A. , Haggerty, S.E., Boyd, F.R.A Unique Olivine Megacryst from the Monastery MineEos, Vol. 57, No. 4, P. 355. (abstract.).South AfricaPetrography
DS200412-1304
2004
Merkel, S.Merkel, S.Earth science: the mantle deformed.Nature, No. 6985, April 22, p. 812.MantleTectonics
DS201212-0079
2012
Merkel, S.Bollinger, C., Merkel, S., Raterron, P.Rheology and texture development in olivine deformed in the D-DIA at mantle PT conditions.emc2012 @ uni-frankfurt.de, 1p. AbstractMantleRheology
DS201905-1071
2019
Merkel, S.Raterron, P., Bollinger, C., Merkel, S.Olivine intergranular plasticity at mantle pressures and temperatures.Comptes Rendus Geoscience, in press available 6p.Mantleolivine

Abstract: The ductile behavior of olivine-rich rocks is critical to constrain thermal convection in the Earth's upper mantle. Classical olivine flow laws for dislocation or diffusion creep fail to explain the fast post-seismic surface displacements observed by GPS, which requires a much weaker lithosphere than predicted by classical laws. Here we compare the plasticity of olivine aggregates deformed experimentally at mantle pressures and temperatures to that of single crystals and demonstrate that, depending on conditions of stress and temperature, strain accommodated through grain-to-grain interactions - here called intergranular strain - can be orders of magnitude larger than intracrystalline strain, which significantly weakens olivine strength. This result, extrapolated along mantle geotherms, suggests that intergranular plasticity could be dominant in most of the upper mantle. Consequently, the strength of olivine-rich aggregates in the upper mantle may be significantly lower than predicted by flow laws based on intracrystalline plasticity models.
DS200412-1443
2004
Merkle, K.W.Nomade, S., Renne, P.R., Merkle, K.W.40 Ar 39 Ar age constraints on ore deposition and cooling of the Bushveld Complex, South Africa.Journal of Geological Society of London, Vol. 161, 3, pp. 411-420.Africa, South AfricaGeochronology - Kaapval Craton
DS1997-0765
1997
Merkle, R.K.W.Merkle, R.K.W., Wallmach, T.Ultramafic rock in the centre of the Vredfort structure, South Africa:geochemical affinity..Chemical Geol, Vol. 143, No. 1-2, Nov. 17, pp. 43-64South AfricaBushveld, layered intrusions, Geochemistry
DS200612-0909
2006
Merkouriev, S.Merkouriev, S., DeMets, C.Constraints on Indian plate motion since 20 Ma from dense Russian magnetic data: implications for Indian plate dynamics.Geochemistry, Geophysics, Geosystems: G3, Vol. 7, Q02002IndiaGeophysics - magnetics
DS1988-0460
1988
Merks, J.W.Merks, J.W.Sampling and weighing of mineral concentratesBulk Solids Handling, Vol. 8, No. 2, pp. 179-185