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Metamorphic petrology of Clinopyroxene Amphibolite from the Xigaze Ophiolite,Southern tibet: p-t Constraints and phase Equilibrium Modeling

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Journal of Earth Science 2019年第3期30卷 549-562页

作者： Yancheng Zhang Xu-ping Li Guangming Sun Zeli Wang Wenyong Duan Shandong provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals College of Earth Science & EngineeringShandong University of Science and Technology

the clinopyroxene amphibolite from the Bailang terrane is located in the central section of the Yarlung Zangbo suture zone(YZSZ),southern tibet.the study of it is expected to provide important clues for the subduction of the Neo-tethyan Ocean below the Asian plate and thus for better understanding of the development of the India-Asia collision zone.Based on integrated textural,mineral compositional,metamorphic reaction history and geothermobarometric studies of the clinopyroxene amphibolite within a serpentinite mélange,four overprinted metamorphic stages are established.they are the first metamorphic record of M1 stage indicated by a relict assemblage of plagioclase+clinopyroxene+amphibole,an early M2 stage characterized by an assemblage of medium-grained clinopyroxene+amphibole+plagioclase+quartz as well as rutile inclusion in titanite,which is formed during burial process,an isobaric cooling M3 stage which is characterized by an assemblage of clinopyroxene+amphibole+plagioclase+titanite,and a decomposing retrograde stage M4,which is represented by the amphibolite+plagioclase symplectite+titanite+rutile+quartz.By applying the tHERMOCALC(versions 6.2 and 6.3)technique in the NCFMASHtO system,the p-t conditions estimated from M1 to M4 stages are ca.8.6 kbar/880℃,10.8–13.4 kbar/800–840℃,12.7–13.2 kbar/650–660℃ andpectively.the mineral assemblages and their p-t conditions define a counterclockwise p-t path for the clinopyroxene amphibolite of the Xigaze ophiolite,suggesting that the rocks underwent a cooling process during burial from magmatic protolith,and a decompressing stage after the pressure peak metamorphic conditions,which implies that the Bailang terrane of the Xigaze ophiolite may have experienced subduction/collision-related tectonic processes.the peak metamorphism reaches to the transitional p-t conditions among amphibolite facies,granulite facies and eclogite facies with a burial depth of 30–40 km.After exhumation of the ophiolitic unit to the shallow crustal levels,the clinopyroxene

关键词： clinopyroxene amphibolite thermodynamic modeling p-t conditions counterclock p-t path Bailang terrane Xigaze ophiolite tibet

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petrology and Metamorphic p-t paths of Metamorphic Zones in the Huangyuan Group,Central Qilian Block,NW China

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Journal of Earth Science 2019年第6期30卷 1280-1292页

作者： Zhuoyang Li Yilong Li Limin Zhao Jianping Zheng Fraukje M.Brouwer School of Earth Sciences State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan 430074China Geology&Geochemistry Group Department of Earth SciencesVU AmsterdamDe Boelelaan 10851081 HV AmsterdamThe Netherlands

the Central Qilian Block is a precambrian block in the Qilian Orogen,which has long drawn international attention for the study of orogeny and continental dynamics.the Huangyuan Group in the Datong area is one of the precambrian metamorphic basement units in the Central Qilian Block and reflects metamorphism in the Barrovian garnet zone and sillimanite zone from south to north.Based on detailed fieldwork,this study presents a systematic study of petrography,mineral chemistry and phase equilibria of schists and gneisses from the two metamorphic zones.the garnet metamorphic zone is composed of micaschist,garnet-bearing micaschist and felsic leptynite,with interlayered plagioclase amphibolite.the sillimanite metamorphic zone consists of garnet-bearing biotite micaschist,sillimanite-bearing biotite-plagioclase gneiss and felsic *** from the garnet metamorphic zone shows growth zoning with increasing almandine and pyrope and decreasing spessartine from core to *** from the sillimanite metamorphic zone is almost homogeneous.towards the outer rim,the contents of almandine and pyrope slightly decrease and grossular slightly increase.Biotite in both metamorphic zones is ferro-biotite.plagioclase is oligoclase in garnet metamorphic zone and andesine in sillimanite metamorphic zone.phase equilibrium modeling of a sample from garnet metamorphic zone resulted in a clockwise p-t path with a prograde stage(4.5–5.0 kbar,520–530℃),a peak p stage(9.8–10.2 kbar,560–570℃),a stage of thermal relaxation(8.0–8.5 kbar,580–590℃)and finally a retrograde stage(6.8–7.0 kbar,560–580℃).thermodynamic modeling of a sample from the sillimanite metamorphic zone indicates a prograde stage(5.5–6.0 kbar,540–550℃)and a peak stage(7.8–8.5 kbar,660–690℃).the results indicate that the Huangyuan Group experienced medium-pressure amphibolite-facies metamorphism,which resulted from continental-continental collision between the Qaidam Block and the Central Qilian Block.

关键词： Qilian Block Huangyuan Group garnet zone sillimanite zone p-t path thermodynamic modeling

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Mineral chemistry, p-t-t paths and exhumation processes of mafic granulites in Dinggye, Southern tibet

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Science China Earth Sciences 2005年第11期48卷 1870-1881页

作者： LIU Shuwen ZHANG Jinjiang SHU Guiming LI Qiugen the Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China The Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China

the mafic granulites in Dinggye, as various scale lense-shaped enclaves within the high Himalayan crystalline rock series, occur along mylonitic foliations at the junction between the Southern tibetan Detachment System (StDS) and the Xainza-Dinggye normal fault system. the main lithological assemblage comprises garnet plagioclase pyroxenite, garnet two-pyroxene granulite, pyroxene garnet amphibolite and so on. the detailed petrological analyses show that these mafic granulites underwent at least four-stage metamorphic evolution. the first metamor-phic stage, the garnet+clinopyroxene+quart mineral assemblage (M1) was probably formed un-der eclogite facies, the second stage, the plagioclase+clinopyroxene symplectite mineral as-semblage (M2) was produced under high-pressure granulite facies by the early decompressive breakdown of M1 mineral assemblage, the third stage, the plagioclase+clinopyroxene+ hypersthene symplectite mineral assemblage (M3) was formed at granulite facies by the late period decompressive breakdown of M1 and M2 mineral assemblages and the final stage, pla-gioclase+hornblende mineral assemblage (M4) was formed by hydrolysis of earlier mineral as-semblages during late uplifting. the detailed mineral composition analyses suggest that garnets and clinopyroxenes within M1 and M2 mineral assemblages display similar compositions to the equivalents in the B and C types of eclogites, whereas the M3 clinopyroxenes are akin to these of the same kind of minerals in the granulite. these mineral chemistry features and p-t estimates calculated by mineral thermometers and barometers indicate that the early stage relic porphyro-blasts (M1) could be formed at the eclogite facies, the early decompressive breakdown (M2) occurred at the high-pressures granulite facies of 1.35―1.48 Gpa and 625―675℃, the M3 mineral assemblage recorded the granulite facies of 0.7―0.95 Gpa and 775―900℃ and M4 plagioglase+hornblende retrograde mineral assemblage was produced under the amphibolite facies metamorphism with pressure of 0.4

关键词： mafic granulites, garnet and clinopyroxene, metamorphic p-t conditions, eclogite facies metamorphism, three-stage exhumation, Dinggye in Southern tibet

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Origin of Li-F-rich granite: Evidence from high p-t experiments

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Science China Earth Sciences 2004年第7期47卷 639-650页

作者： LI Fuchun1,2, ZHU Jinchu2, RAO Bing2, JIN Zhangdong3 & ZHANG Linsong2 1. School of Resource and Environment Sciences, Nanjing Agriculture University, Nanjing 210095, China 2. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China 3. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China School of Resource and Environment Sciences Nanjing Agriculture University Nanjing China State Key Laboratory for Mineral Deposits Research Nanjing University Nanjing China Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing China

though magmatic origin of Li-F-rich granite has been supported effectively by the existence of volcanic and subvolcanic rocks and melt inclusions trapped in them with similar chemical compositions, evidence from high t-p experiments is poor up to now. to simulate the evolution process of Li-F-rich granite and to interpret its forming mechanism, a series of melting- crystallization experiments were carried out. Under the conditions of 1108 pa and 570—700℃, a magmatic mineral association of quartz + alkali feldspar + lithium muscovite/ferromuscovite ?fluorite cassiterite is found in leucogranite-HF-H2O system. this indicates the following points: (i) Fluorite, light-colored muscovite and cassiterite can crystallize directly from the Li-F-rich gran-itic melt. (ii) the coexistence of dark-colored micas (e.g. biotite) and light-colored micas (e.g. lithium muscovite and ferromuscovite) suggests that the muscovite granite and two-mica granite can be formed under magmatic condition. the zonal texture of micas is not the sole feature for the micas of hydrothermal origin. (iii) As crystallization proceeds, the SiO2 concentration of the residual melt decreases, while the Al2O3 and F concentrations and A/CNK, NKA/Si ratios of the melt incerese, favoring the formation of Li-F-rich granites. Our experiment results are well con-sistent with the vertical zonation widely observed in rare metal bearing granites, and therefore provide strong experimental evidence for magmatic origin of Li-F-rich granite.

关键词： fluorite, lithium muscovite, ferromuscovite, cassiterite, melt evolution, Li-F-rich granite, high p-t experiment.

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Multi-Stage Metamorphism of the UHp pelitic Gneiss from the Southern Altyn tagh Hp/UHp Belt,Western China:petrological and Geochronological Evidence

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Journal of Earth Science 2019年第3期30卷 603-620页

作者： Yuting Cao Liang Liu Chao Wang Cong Zhang Lei Kang Wenqiang Yang Xiaohui Zhu Shandong provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals College of Earth Science & Engineering Shandong University of Science and Technology Qingdao 266590 China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Xi'an Center of Geological Survey China Geological Survey Xi'an 710054 China

the kyanite-bearing garnet pelitic gneiss from the Jianggalesavi area in southern Altyn tagh high pressure/ultra-high pressure belt was proved to have been experienced UHp metamorphism (>12 Gpa) by the discovery of kyanite and spinel exsolution microstructure in quartz (precursor stishovite). In this study, three stages of retrograded metamorphism (M2-M4) after the UHp metamorphism (Ml) were identified for the UHp pelitic gneiss. the Hp granulite-facies stage (M2) was characterized by the mineral assemblage of garnet+kyanite+K?feldspar+nitile+qiiartz±ilinenite, recording the p-t condition of >1.12 Gpa and ?850-930℃. the granulite-facies stage (M3) was represented by the mineral assemblage of garnet rim+K-feldspar+sillimanite (SillJ+biotite (Bti)+plagioclase (pli)+ilmenite+quartz, and confined under p-t conditions of 0.5-0.8 Gpa and^770-795℃. the late cooling stage M4 was accompanied by the appearance of fine-grained pl2, Sill2 and Bt2 in the matrix, and the p-t conditions were 0.4-0.6 Gpa and p-t path was obtained for the pelitic gneiss in the p-t pseudosection, which showed a deep subduction/collision processes with subsequent exhumation and cooling. Com? bined with the corresponding multistage metamorphic assemblages, the age dating results implied that the zircons from the gneiss have integrated the recording peak metamorphic (Ml,484±3 Ma) and retrograded metamorphic ages (M2 to M3, 450±2 Ma). there was about 32 Ma interval during the first exhumation from the upper mantle depth (>350 km) to the lower crust depth (-40-20 km), resulting in an average exhumation rate of 9.11-9.70 mm/yr. In the southern Altyn tagh region, the Hp and UHp rocks from different areas had identical peak metamorphic ages. therefore, contemporary UHp and Hp rocks with different metamorphic evolutions were recognized coexisting in the same orogenic belt, which can be interpreted by the model of subduction channel. the continental crustal were subducted to different depths along the direction of the subduction channel

关键词： southern Altyn tagh Hp/UHp belt kyanite-bearing garnet pelitic gneiss p-t pseudosection subduction channel continental deep subduction and exhumation

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Microstructures and phase transition in Omphacite: Constraints on the p-t path of Shuanghe Eclogite (Dabie Orogen)

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Journal of Earth Science 2020年第2期31卷 254-261页

作者： Zhanjun Xie Xiangwen Liu Zhenmin Jin Zhuoyue Li School of Earth Sciences China University of GeosciencesWuhan 430074China State Key Laboratory of Geological processes and Mineral Resources China University of GeosciencesWuhan 430074China Engineering Research Center of Nano-Geo Materials of Ministry of Education China University of GeosciencesWuhan 430074China

Omphacite microstructures are important to decipher the metamorphic pressuretemperature(p-t)conditions of eclogite during subduction and exhumation processes.Here we present a systematic microstructural investigation of omphacite using transmission electron microscopy(tEM)in an ultrahigh-pressure(UHp)eclogite sample from Shuanghe,Dabie orogen,China.the omphacite can be divided into two phases:(1)Omp-1,exhibits as the main part of omphacite with p2/n space group containing small amount of dislocations and numerous antiphase domains(ApDs).(2)Omp-2,shows as banded subgrains with C2/c space group containing large amount of dislocations.these two phases of omphacite have almost the same crystallography orientation and bounded by dislocation walls.Along these dislocation walls,we found some barroisite and albite microcrystals.the barroisite microcrystals contain large amount of dislocations and show a topological relation with host omphacite.While the albite microcrystals contain small amount of dislocations and does not show topological relation with host.these microstructures could give us the following metamorphic information to constrain the p-t path of eclogite:Firstly,this two omphacite space groups should be evolved from the same precursor C2/c omphacite,which had been underwent strongly plastic deformation during the syn-to late-peak metamorphic stage.Secondly,the precursor C2/c omphacite began to be retrograded and altered by small amount of barroisite microcrystals along its dislocation walls under the p-t condition of 2.2–2.6 Gpa and 650–700℃ at the early amphibole eclogite stage.thirdly,large amount of Na and other elements were exsolved from some precursor C2/c omphacite subgrains and crystallized numerous albite microcrystals at their boundaries,which is the necessary for the space group of C2/c surviving under the lower p-t conditions(1.7–1.9 Gpa and 630–690 C)during the middle amphibole eclogite stage.Lastly,the rest of precursor C2/c omphacite subgrains were transformed into p2/n polymorph and formed t

关键词： microstructure omphacite eclogite tEM p-t path

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First observation of microspherule from the infratrappean Gondwana sediments below Killari region of Deccan LIp,Maharashtra(India) and possible implications

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Geoscience Frontiers 2019年第6期10卷 2281-2285页

作者： G.parthasarathy O.p.pANDey B.Sreedhar Mukund Sharma priyanka tripathi Nimisha Vedanti CSIR-National Geophysical Research Institute Hyderabad500007India National Institute of Advance Studies School of Natural Sciences and EngineeringIndian Institute of Science CampusBengaluru560012India CSIR-Indian Institute of Chemical technology Hyderabad500007India Birbal Sahni Institute of palaeosciences 53 University RoadLucknow226007India presently at Banaras Hindu University VaranasiIndia Geological Survey of India BandalagudaHyderabad50068India

A rare occurrence of a microspherule has been found in the infratrappean sediments,encountered below338 m thick Deccan volcanic cover in KLR-1 scientific borehole,drilled in the epicentral zone of the 1993 Killari earthquake(Maharashtra,India).palynological studies of the sediments indicate their age as Early permian(Asselian,298-295 Ma) for deposition.transmission electron microscope studies reveal that the spherule from the infratrappeans,is having a similar composition to that of the Neoarchean amphibolite to granulite facies mid crustal basement.the spherule is non-spherical in nature,containing mostly FeO(10.70±0.20 wt.%),CaO(13.8±0.5 wt.%),Al203(7.78±0.30 wt.%),MgO(6.47±0.3 wt.%),Si02(47,46±0.50 wt.%),ti02(2.47±0.3 wt.%).K20(1.89±0.20 wt.%).and Cl(0.33±0.05 wt.%).Since the Fe composition of the spherule is almost same as the basement rock(10.5 wt.%),and the chlorine content is also in the same range as the basement(0.04-0.24 wt.%),it would suggest possibility of an extraterrestrial impact over the Indian terrain during the erstwhile Gondwana sedimentation period that may be associated with the permian-triassic mass extinction,the most severe one in the Earth's history.

关键词： Deccan trap Killari borehole Microspherules Condwana sediments tectonics p-t impact

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Metamorphism and Zircon Geochronological Studies of Metagabbro Vein in the Yushugou Granulite-peridotite Complex from South tianshan,China

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Journal of Earth Science 2019年第6期30卷 1215-1229页

作者： Lu Zhang Jianjiang Zhu Bin Xia Cong Zhang Lifei Zhang Center for High pressure Science and technology Advanced Research Beijing 100094China Key Laboratory of Orogenic Belts and Crustal Evolution MOESchool of Earth and Space SciencesPeking UniversityBeijing 100871China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China School of Earth Sciences^China University of Geosciences Wuhan 430074China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Yushugou granulite-peridotite complex,located at the east part of the northern margin of South tianshan,may represent an ophiolitic slice subducted to 40–50 km depth with high-pressure granulite facies metamorphism.Although a lot of studies have been conducted on rocks in this belt,the rock association and tectonic background of the ophiolitic slice are still in dispute.A detailed study on petrology,phase equilibrium modeling and U-pb zircon ages have been performed on the metagabbro vein in peridotite unit to constrain the tectonic evolution of the Yushugou granulite-peridotite complex.three stages of mineral assemblage in the metagabbro were defined as stage I:Cpx^A+Opx^A+pl^A,which represents the original minerals of the metagabbro vein;stage II:Cpx^B+Opx^B+pl^B+Spl,which represents the mineral assemblage of granulite facies metamorphism with peak p-t conditions of 4.2–6.9 kbar and 940–1070℃;stage III is characterized by the existence of prehnite,thomsonite and amphibole in the matrix,indicating that the metagabbro vein may be influenced by fluids during retrograde metamorphism.Combined with the crosscut relationship,it can be deduced that the metagabbro vein,together with the peridotite in Yushugou granulite-peridotite complex has experienced similar high-temperature granulite facies metamorphism.the zircon chronological data shows that the protolith age of the metagabbro vein is 400.5±6.2 Ma,reflecting Devonian magmatism event and the granulite facies metamorphism occurred at^270 Ma which may be related to the post-collisional magmatism.

关键词： metagabbro vein granulite facies metamorphism p-t pseudosection U-pb zircon dating South tianshan

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petrology of metamorphic rocks from the Atbashy complex,Southern tien-Shan,Kyrgyzstan

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Geoscience Frontiers 2018年第6期9卷 1795-1807页

作者： Maksatbek Satybaev Lin Ding Akira takasu Apas Bakirov Kadyrbek Sakiev Fulong Cai Rustam Orozbaev Azamat Bakirov Janybek Baslakunov Key Laboratory of Continental Collision and plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Center for Excellence in tibetan plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Geoscience Shimane University1060 NishikawatsuMatsue 690-8504Japan Institute of Geology National Academy of Sciences30 ErkindikBishkek 720040Kyrgyzstan Research Center for Ecology and Environment of Central Asia(Bishkek) 30 ErkindikBishkek 720040Kyrgyzstan

the high-to ultrahigh-pressure metamorphic rocks of the Atbashy complex were petrologically investigated. the eclogites of the Choloktor Formation show a prograde evolution from epidote-blueschist facies(p = 17-21 kbar and t = 450-515 ℃) to peak eclogite-UHp conditions(p = 26-29 kbar and t = 545-615 ℃) with a subsequent epidote-amphibolite and greenschist facies overprint. the micaschists of the Choloktor Formation also show a clockwise p-t path from blueschist/epidote-blueschist facies conditions through peak eclogite facies conditions(p = 21-23 kbar and t = 530-580 ℃) to retrograde epidote-amphibolite and greenschist facies stages. A comparison of the p-t paths in the eclogites and mica-schists of Choloktor Formation reveal that they may have shared their p-t history from peak to retrograde stages. the mica-schists of the Atbashy Formation record peak metamorphism of p = 10-12 kbar and t = 515-565 ℃, which indicates that the highest grade of regional metamorphism in the Atbashy Ridge was epidote-amphibolite facies.the newly obtained p-t conditions for the mica-schists of Choloktor Formation indicate that sheets of sedimentary rocks were brought to great depths along the subduction zone and they metamorphosed under eclogite facies Hp conditions. the eclogite blocks were amalgamated with mica-schists of Choloktor Formation in the eclogite facies Hp conditions and together they experienced isothermal decompression to ～40 km. During this path, the eclogites and mica-schists of Choloktor Formation docked with mica-schists of Atbashy Formation at 10-12 kbar and 515-565 ℃, and from this depth(～40 km) the whole sequence was exhumed together. these new results improve our understanding of high-pressure metamorphism in subduction-related accretionary prism zones and the exhumation processes of deeply-seated rocks in the Atbashy Hp-UHp complex.

关键词： Eclogite Mica-schists p-t conditions Atbashy Kyrgyz tien-Shan

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Characteristics in naturally and experimentally shocked chondrites: A clue to p-t conditions of impacted asteroids

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Science China Earth Sciences 2000年第5期43卷 480-486页

作者：谢先德陈鸣戴诚达 A.EI Goresy Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Max-planck-Institute fur Chemie Mainz 55128 Germany

the aim of this study is to compare the experimentally shock-induced features with those in naturally shocked chondrites and to test the feasibility of experimentally calibrating naturally induced features in shocked H- and L-chondrites. Samples of the Jilin chondrite (H5) were experimentally shock-loaded at the following peak pressures: 12, 27, 39, 53, 78, 83, 93 and 133 Gpa respectively. Chondritic melts were first obtained at p>78 Gpa and more than 60% melting was achieved at p～133 Gpa. No high-pressure phases were observed in any of the shocked samples, neither in the deformed nor in the molten regions. textural relations and mineral assemblages of the shocked samples are comparable to those encountered in the heavily shocked H-chondrite Yanzhuang but differ considerably from those found in heavily shocked L6 chondrites. Shock melt veins in L6 chondrites contain high-pressure polymorphs of olivine and pyroxene and high pressure liquidus phases. Scaling from shock experiments on millimeter-sized

关键词： chondrite experiment shock characteristics asteroid p-t condition.

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