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The Sytykanskaya kimberlite pipe:Evidence from deep-seated xenoliths and xenocrysts for the evolution of the mantle beneath Alakit,Yakutia,Russia

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Geoscience Frontiers 2015年第5期6卷 687-714页

作者： I.V.Ashchepkov A.M.Logvinova L.F.Reimers T.Ntaflos Z.V.Spetsius N.V.Vladykin H.Downes D.S.Yudin A.V.Travin L.V.Makovchuk V.S.Palesskiy O.S.Khmel'nikova institute of Geology and mineralogy SB RAS Vienna University Alrosa Stock Company institute of Geochemistry SB RAS Birkbeck College University of LondonUKMalet Street

Mantle xenoliths（>150） and concentrates from late autolithic breccia and porphyritic kimberlite from the Sytykanskaya pipe of the Alakit field（Yakutia） were analyzed by EPMA and LAM ICP *** P-TX-f（O2） diagrams minerals from xenoliths show widest variations,the trends P-Fe#-CaO,f（O2）for minerals from porphyric kimberlites are more stepped than for xenocrysts from *** PTX points mark moving for protokimberlites from the lithosphere base（7.5 GPa） to pyroxenite lens（5-3.5 GPa） accompanied by Cr increase by AFC and creation of two trends P-Fe#OI10-12%and13-15%.The Opx-Gar-based mantle geotherm in Alakit field is close to 35 mW/m2 at 65 GPa and 600 C near Moho was *** oxidation state for the megacrystalline ilmenites is lower for the metasomatic associations due to reduction of protokimberlites on peridotites than for uncontaminated varieties at the lithosphere *** inclined linear REE patterns with deep HFSE troughs for the parental melts of clinopyroxene and garnet xenocrysts from breccia were influenced by differentiated *** for metasomatic xenoliths reveal less inclined slopes without deep troughs in spider *** reveal S-shaped REE *** clinopyroxenes from graphite bearing Cr-websterites show inclined and inflected in Gd spectrums with LREE variations due to AFC *** for garnets display less inclined patterns and Ba-Sr troughs but enrichment in ***40Ar/39Ar ages for micas from the Alakit mantle xenoliths for disseminated phlogopites reveal Proterozoic（1154 Ma） age of metasomatism in early Rodinia *** glimmerites with richterite- like amphiboles mark1015 Ma plume event in Rodinia ***600-550 Ma stage manifests final Rodinia *** last 385 Ma metasomatism is protokimberlite-related.

关键词： Kimberlites Mantle lithosphere Mantle xenoliths Th

Characteristics of sulfur species and their implications in Lower Cambrian black shales from southern margin of Yangtze Platform

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Science China Earth Sciences 2001年第5期44卷 455-467页

作者：雷加锦李任伟濮英英方家虎 institute of Geology Chinese Academy of Sciences Beijing China institute of Geology and mineralogy University of Erlangen-Nuremberg Erlangen Germany China University of Mining and Technology Beijing China

There are different sulfur forms in the black shales from theEarly Cambrian of the Yangtze platform. With its emphasis on pyrite and organosulfur, this paper discusses their distribution and formation. The research shows that sulfur phases take regular variations laterally as well as vertically in the research areas. In western researched profile with high terrigenous supply at the time it formed, there exists a larger amount of pyrite and less organosulfur, and pyrite amount declines while organosulfur content increases upwards along the profile. This black shale profile is characterized by relatively light sulfur isotope composition with evolution trend of becoming heavier both for pyrite and organosulfur from bottom to top along the profile. Opposite situation occurs in eastern profiles which were located farther away from terrigenous land. Here pyrite amount obviously decreases and organic matter has combined more sulfur, although these two kinds of sulfur species take similar trend in content variation along profiles to that for western profile. At the same time more 34S is accumulated in sulfur species of black shale samples from eastern profile, and sulfur isotope composition gradually turns lighter from bottom to top. In combination with other information of iron, organic carbon contents and petrographic features, it can be established that sea-level change, supply of terrigenous matters, tectonic background and natures of paleoceanic chemistry have exerted great influence on the distribution of sulfur species in these black shales.

关键词： Yangtze platform sulfur isotope black shale Early Cambrian

FORMATION OF LARGE-SCALE TECTONIC ELEMENTS FROM THE POSITION OF CENTRIFUGAL-INERTIAL FORCE ACTION

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Geotectonica et Metallogenia 2005年第1期29卷 13-33页

作者： Molchanov V. I. Paraev V. V. United institute of Geology Geophysics and Mineralogy Siberian Division of Russian Academy of Sciences Novosibirsk 630090 RussiaUnited Institute of Geology Geophysics and Mineralogy Siberian Division of Russian Academy of Sciences Novosibirsk 630090 Russia

We describe the earlier unknown, when applied to global tectonics, centrifugal inertial mechanism of lithosphere plate moving under the effect of forces appearing as a result of Earth’s planetary rotation. The mechanism stated gives an insight into global tectonics of plates with the indirect participation of emanation streams which, in their turn, are the derivatives of centrifugal and inertial forces of planetary motion. The application of this mechanism provides a logical explanation for the regularities of global tectogenesis including the formation of mountain ridges mainly of submeridional and sublatitudinal strike, and also the drift of continental plates from the east to the west and from the south to the north. The mechanism clarifies the significance of the Arctic and the Antarctic Circles as geodynamic barriers.

关键词： formation tectonic element centrifugal-inertial force section

Interaction between protokimberlite melts and mantle lithosphere:Evidence from mantle xenoliths from the Dalnyaya kimberlite pipe,Yakutia(Russia)

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Geoscience Frontiers 2017年第4期8卷 693-710页

作者： I.V.Ashchepkov T.Ntaflos Z.V.Spetsius R.F.Salikhov H.Downes institute of Geology and mineralogy SD RAS Vienna University Alrosa Stock Company Department of Earth and Planetary Sciences Birkbeck University of London

The Dalnyaya kimberlite pipe（Yakutia,Russia） contains mantle peridotite xenoliths（mostly Iherzolites and harzburgites） that show both sheared porphyroclastic（deformed） and coarse granular textures,together with ilmenite and clinopyroxene *** peridotites contain high-temperature Fe-rich clinopyroxenes,sometimes associated with picroilmenites,which are products of interaction of the lithospheric mantle with protokimberlite related *** orthopyroxene-derived geotherm for the lithospheric mantle beneath Dalnyaya is stepped similar to that beneath the Udachnaya *** granular xenoliths fall on a geotherm of 35 mWm-2 whereas deformed varieties yield a 45 mWm-2）geotherm in the 2-7.5 GPa pressure *** chemistry of the constituent minerals including garnet,olivine and clinopyroxene shows trends of increasing Fe~#（=Fe/（Fe＋Mg））with decreasing *** may suggest that the interaction with fractionating protokimberlite melts occurred at different *** major mantle lithologies are distinguished by the trace element patterns of their constituent minerals,determined by ***,some clinopyroxenes and rare garnets are depleted in Ba,Sr,HFSE and MREE and represent relic lithospheric ***-fertilized garnet and clinopyroxene are more *** distribution of trace elements between garnet and clinopyroxene shows that the garnets dissolved primary orthopyroxene and *** high temperature clinopyroxenes related to the protokimberlite melts partially dissolved these *** show decreases in Ni and increases in Al,Ca and Ti from Mg-rich varieties to the more Fe-rich,deformed and refertilized *** showing higher Fe~#（0.11-0.15） are found within intergrowths of low-Cr ilmenite-clinopyroxene-garnet related to the crystallization of protokimberlite melts in feeder *** P-f（O_2） diagrams,garnets and Cr-rich clinopyroxenes indicate reduced conditions at the base of the lithosphere at-5

关键词： Mantle xenoliths Trace element Melt interaction Kimberlite Pyrope Cr-diopside

Dynamic observation of ore-forming solutions by in-situ FT-IR spectroscopy and UV spectroscopy connected with high temperature and high pressure cell

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Chinese Science Bulletin 1999年第S2期44卷 1-3页

作者： Stepantchikova S.A. Kolonin G.K United institute of Geology Geophysics and Mineralogy SB RAS Novsibirsk Russia

THE structure of aqueous and metal bearing solution, if observed dynamically by in situ spectrometer atelevated temperatures and pressures, will show new information on the kinetic mechanism of ore-formingfluids and water/mineral interactions. 1 Water and NaCl aqueous solutions The nature of water and NaCl·H2O solutions has been examined in a temperature range from 25 to850℃ and pressure from 1.33×105 to 1.33×106 Pa by using hydrothermal diamond anvil cell （HDAC）and in situ FT-IR spectroscopy （an infra-red microscope: Bio-Rad, UMA, 500）. The phase transitionsof NaCl-H2O solutions can be observed by using an optical microscopy connected with HDAC, and at thesame time the infra-red spectra of NaCl-H2O binary system at any fixed physical chemical conditions canbe tested.

关键词： dynamic observation in situ spectrometer high temperature ore-fluids.

俄罗斯Kurile-Kamchatka地区安山质熔体的成分、挥发分组成和微量元素

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岩石学报 2007年第1期23卷 93-104页

作者： M.L.Tolstykh V.B.Naumov A.D.Babansky Vernadsky institute of Geochemistry and Analytical Chemistry Russian Academy of Sciencesul.Kosygina 19Moscow119991 Russia institute of Geology of Ore Deposits PetrographyMineralogyand GeochemistryRussian Academy of SciencesStaromonetnyi per.35Moscow119017Russia

Melt inclusions in minerals from some volcanoes of the Kurile-Kamchatka region were *** studied basaltic andesites and andesites were sampled from volcanoes of the Central Kamchatka depression(Shiveluch and Bezymyannyi),Eastern Kamchatka volcanic belt(Avachinskii and Karymskii),and Iturup Island,Southern Kuriles(Kudryavyi).Basalts of the 1996 eruption of the Karymskii volcanic center and dacites of Dikii Greben'volcano,Southern Kamchatka were also *** than 260 melt inclusions from 31 rock samples were homogenized,and quenched glasses were analyzed using electron and ion *** compositions of melt inclusions in andesitic phenoerysts vary in silica contents from 56 to 80wt%.Al_2 O_3 ,FeO,MgO,CaO decrease and Na_2O and K_2O increase with increasing SiO_*** inclusions(about 80% )are dacitic or ***,the compositions of silicic glasses(>65wt% SiO_2)in andesites significantly differ in TiO2,FeO,MgO,CaO,and K_2O contents from those in dacites and ***-potassium melts(K_2O 3.8～6.8wt% )with various SiO_2 from 51.4 to 77.2wt% were found in minerals of all volcanoes *** indicates a contribution of a component selectively enriched in potassium to magmas of the whole region.A great compositional diversity of melt inclusions in plagioelase phenocrysts from the Bezymyannyi andesites suggests a complex history of plagioclase crystallization and magma evolution in the andesite *** from different volcanoes strongly vary in volatile *** highest H_2O contents are found in the melts from Shiveluch(3.0～7.2wt%,4.7wt% on average)and Avachinskii (4.7～4.8wt%);while those are lower in melts of Kudryavyi(0.1～2.6wt% ),Dikii Greben'(0.4～1.8wt%),and Bezymyannyi (<1wt%).Chlorine contents are also *** lowest values are found in the Bezymyannyi melts(0.09wt% on average),the highest Cl contents are typical of melt inclusions in minerals from the Karymskii andesites(0.26wt% on average).The melts from Avachinski

关键词：俄罗斯Kurile-Kamchatka地区安山质熔体成分挥发分组成微量元素

Late Paleozoic alkaline magmatism in Western Transbaikalia,Russia:Implications for magma sources and tectonic settings

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Geoscience Frontiers 2020年第4期11卷 1289-1303页

作者： Ivan Izbrodin Anna Doroshkevich Mikhail Rampilov Alexey Elbaev German Ripp Geological institute Siberian Branch of the Russian Academy of SciencesRussia V.S.Sobolev institute of Geology and mineralogy Siberian Branch of the Russian Academy of SciencesRussia

This paper presents the results of geochronological(40Ar-39Ar,U-Pb SHRIMP Ⅱ),petrological and geochemical studies of the Late Paleozoic complexes of alkaline rocks(Zimovechinsky,Tuchinsky and Koma) located within the Vitim Plateau(the western part of the Mongol-Okhotsk Orogenic Belt).The rocks were formed at 310-280 *** is coeval with Late Paleozoic magmatism within the Central Asian Orogenic *** εNd(T) values show large variations from-2.1 to +3.3 as well as the initial Sr(I) isotopic ratios from 0.7042 to 0.7138,that demonstrate strong isotopic heterogeneity of the magmatic *** geochemical characteristics of the rocks show pronounced positive Pb and negative Ti,Zr-Hf anomalies that can be explained by involvement of the subducted component in primary *** rocks intruded in a setting of extension at the active continental margin of the Siberian Craton during subduction of Mongol-Okhotsk oceanic crust under the Siberian Craton.

关键词： Nepheline-bearing and nepheline-free syenites Geochronological and isotope data Late paleozoic magmatism Sources Central Asian orogenic belt

Fluid Inclusion Evidences for the P-T Conditions of Quartz Veins Formation in the Black Shale-Hosted Gold Deposits, Bodaybo Ore Region, Russia

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Journal of Earth Science 2020年第3期31卷 514-522页

作者： Natalia N.Ankusheva Ekaterina E.Palenova Svetlana N.Shanina institute of mineralogy South-Urals Federal Research Center of Mineralogy and GeoecologyUrals BranchRussian Academy of SciencesMiass 456317Russia Geological Department South-Urals State UniversityMiass 456300Russia institute of Geology of the Komi Science Center Urals BranchRussian Academy of SciencesSyktyvkar 167982Russia

The P-T conditions of auriferous and barren quartz veins from Kopylovsky,Kavkaz and Krasnoye gold deposits in Proterozoic black shales of Bodaybo ore region are presented the first time in this *** inclusions trapped in auriferous quartz are aqueous Na±K-Mg chloride with salinity of 6 wt.%-8.8 wt.%*** temperatures vary from 260 to 350℃,and calculated trapping pressures are 1.2-1.6 *** fluids trapped in barren quartz have more complicated compositions with Na,K,Mg and Fe chlorides,salinity up to 13 wt.%NaCleqv,and homogenization temperatures ranging between 140 and 280℃.The volatiles in fluids are dominated by H2O,followed by CO2 with minor amounts of CH4 and *** suppose that auriferous and barren quartz veins have been formed due to the basic metamorphogenic fluid as evidenced by the close slat and gas fluid composition.

关键词： Bodaybo black shales gold deposits gold-bearing quartz barren veins fluid inclusions P-T conditions

Gneiss-Water Interaction and Water Evolution During the Early Stages of Dissolution Experiments at Room Temperature

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Chinese Journal Of Geochemistry 2003年第4期22卷 302-312页

作者：朱义年 Ingrid Stober Kurt Bucher Dept. of Resource and Environmental Engineering Guilin Institute of Technology Geological Survey Baden-Württemberg institute for mineralogy Petrology and Geochemistry University of Freiburg

Gneiss\|distilled water interaction at room temperature was investigated with batch\|reactors to study water\|rock reaction and geochemical evolution of the aqueous phase with time. The ion concentrations in water were controlled not only by the dissolution of primary minerals, but also by the precipitation of secondary minerals. The decreasing fraction sizes of gneiss could favor dissolution and precipitation simultaneously. Ca\+\{2+\} and K\++ were the major cations, and HCO\+-\-3 was the major anion in water. All the ions except Ca\+\{2+\} increased in concentration with time. The Ca\+\{2+\} release from the rock to the aqueous phase was initially much faster than the release of K\++, Na\++ and Mg\+\{2+\}. But after about 5-24 hours, the Ca\+\{2+\} concentrations in water decreased very slowly with time and became relatively stable. During the experiment, the water varied from the Ca\|(K)\|HCO\-3\|type water to the K\|Ca\|HCO\-3\|type water, and then to the K\|(Ca,Na)\|HCO\-3\|type water. The water\|gneiss interaction was dominated by the dissolution of K\|feldspar in the solution. The remaining secondary minerals were mainly kaolinite, illite and K(Mg)\|mica.

关键词： gneLss water interaction water evolufion