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Phlogopite in mantle xenoliths and kimberlite from the Grib pipe,Arkhangelsk province,Russia:Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite

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Geoscience Frontiers 2019年第5期10卷 1941-1959页

作者： a.v. kargin L.v. Sazonova A.A. Nosova N.M. Lebedeva Yu.A. Kostitsyn E.v. Kovalchuk v.v. Tretyachenko Ya.S. Tikhomirova Institute of Geology of Ore Deposits PetrographyMineralogyand GeochemistryRussian Academy of Sciences (IGEM RAS)MoscowRussia Lomonosov Moscow State University MoscowRussia vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences MoscowRussia AC ALROSA Research Geological Prospecting Enterprise ArkhangelskRussia

We present petrography and mineral chemistry for both phlogopite,from mantle-derived xenoliths (garnet peridotite,eclogite and clinopyroxene-phlogopite rocks) and for megacryst,macrocryst and groundmass flakes from the Grib kimberlite in the Arkhangelsk diamond province of Russia to provide new insights into multi-stage metasomatism in the subcratonic lithospheric mantle (SCLM) and the origin of phlogopite in *** on the analysed xenoliths,phlogopite is characterized by several *** first generation (Phl1) occurs as coarse,discrete grains within garnet peridotite and eclogite xenoliths and as a rock-forming mineral within clinopyroxene-phlogopite *** second phlogopite generation (Phl2) occurs as rims and outer zones that surround the Phl1 grains and as fine flakes within kimberlite-related veinlets filled with carbonate,serpentine,chlorite and *** garnet peridotite xenoliths,phlogopite occurs as overgrowths surrounding garnet porphyroblasts,within which phlogopite is associated with Cr-spinel and minor *** eclogite xenoliths,phlogopite occasionally associates with carbonate bearing veinlet ***,from the kimberlite,occurs as megacrysts,macrocrysts,microcrysts and fine flakes in the groundmass and matrix of kimberlitic *** phlogopite grains within the kimberlite are characterised by signs of deformation and form partly fragmented grains,which indicates that they are the disintegrated fragments of previously larger ***1,within the garnet peridotite and clinopyroxeneephlogopitexenoliths,is characterised bylow Ti and Cr contents (TiO292) typical of primary peridotite phlogopite in mantle peridotite xenoliths from global kimberlite *** formed during SCLM metasomatism that led to a transformation from garnet peridotite to clinopyroxene-phlogopite rocks and the crystallisation of phlogopite and high-Cr clinopyroxene megacrysts before the

关键词： Mantle metasomatism Kimberlite Phlogopite Mantle xenoliths Megacrysts

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HYPERFINE INTERACTION AND PHASE TRANSITIONS IN OXIDE FILMS OF ZIRCONIUM ALLOYS

HYPERFINE INTERACTION AND PHASE TRANSITIONS IN OXIDE FILMS O...

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The 4th Joint Meeting of the International Conference on Hyperfine Interactions and the International Symposium on Nuclear Quadrupole Interactions(HFI/NQI 2012)

作者： Filippov v.P. kargin N.I. Alferov P.v. National Research Nuclear University "MEPhI" Kashirskoe shosse31Moscow115409Russia

＜正＞Zirconium alloys with various alloying elements are used in nuclear *** of used element is iron which increase corrosion resistance and improve radiation *** state iron atoms in alloys depend on chemical composi... 详细信息

关键词： Mossbauer effect Zirconium alloys Corrosion MOSSBAUER TIN ZR

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Sheared peridotite xenolith from the *** kimberlite pipe,Arkhangelsk Diamond Province,Russia:Texture,composition,and origin

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Geoscience Frontiers 2017年第4期8卷 653-669页

作者： Alexey vladimirovich kargin Lyudmila.v.acheslavovna Sazonova Anna Andreevna Nosova.v.adimir Anatolievich Pervov Elena.v.adimirovna Minevrina.v.adimir Anatolievich Khvostikov Zhanna Petrovna Burmii Institute of Geology of Ore Deposits PetrographyMineralogyand GeochemistryRussian Academy of Sciences(IGEM RAS) Lomonosov Moscow State University Departamento de Geologia.Sociedade Mineira de Catoca Institute of Technological Problems of Microelectronics and Ultrapure Materials Russian Academy of Sciences

The petrography and mineral composition of a mantle-derived garnet peridotite xenolith from the *** kimberlite pipe（Arkhangelsk Diamond Province,Russia） was *** on petrographic characteristics,the peridotite xenolith reflects a sheared *** sheared peridotite experienced a complex evolution with formation of three main mineral assemblages：（1） a relict harzburgite assemblage consist of olivine and orthopyroxene porphyroclasts and cores of garnet grains（Gar1） with sinusoidal rare earth elements（REE） chondrite C1 normalized patterns;（2） a neoblastic olivine and orthopyroxene assemblage;（3） the last assemblage associated with the formation of clinopyroxene and garnet marginal zones（Gar2）.Major and trace element compositions of olivine,orthopyroxene,clinopyroxene and garnet indicate that both the neoblast and clinopyroxene-Gar2 mineral assemblages were in equilibrium with a high Fe-Ti carbonate-silicate metasomatic *** nature of the metasomatic agent was estimated based on high field strength elements（HFSE） composition of olivine neoblasts,the garnet-clinopyroxene equilibrium condition and calculated by REE-composition of Gar2 and *** these evidences indicate that the agent was a high temperature carbonate-silicate melt that is geochemically linked to the formation of the protokimberlite melt.

关键词： Sheared peridotite Mantle metasomatism Kimberlite Olivine Garnet Clinopyroxene

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