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Chinese Science Bulletin 2001年第10期46卷 867-872页

作者： yang.xiaosong.jin zhenmin Ernst Huenges Frank R.Schilling Bernd Wunder Faculty of Earth Sciences China University of GeosciencesWuhan 430074China GeoForschungsZentrum PotsdamD-14473Germany

Here we present the results of dehydration melting, melt morphology and fluid migration based on the dehydration melting experiments on natural bio-tite-plagioclase gneiss performed at the pressure of 1.0-1.4 GPa, and at the temperature of 770-1028℃. Experimental results demonstrate that: (i) most of melt tends to be distributed along mineral boundaries forming 'melt film' even the amount of melt is less than 5 vol%; melt connectivity is controlled not only by melt topology but also by melt fraction; (ii) dehydration melting involves a series of subprocesses including subsoiidus dehydration reaction, fluid migration, vapor-present melting and vapor-absent melting; (iii) experiments produce peraluminous granitic melt whose composition is similar to that of High Himalayan leucogranites (HHLG) and the residual phase assemblage is Pl+Qz+ Gat+Bio+Opx±Cpx+IIm/Rut±Kfs and can be comparable with granulites observed in Himalayas. The experiments provide the evidence that biotite-plagioclase gneiss is one of

关键词： gneiss dehydration melting melt topology fluid migration leucogranite granulite Himalayas.

Crystallization of Hydrous Ti-Rich Basaltic Magma and Its Implication for the Origin of Fe-Ti Oxide in Layered Intrusions of the Emeishan Large Igneous Province

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Journal of Earth Science 2022年第2期33卷 507-512页

作者： Junlong yang Chao Wang zhenmin jin State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China

A series of crystallization experiments have been carried out by using natural Emeishan Ti-rich hydrous basalts as starting materials at a pressure of 0.5 GPa and temperatures of 800-1000℃to constrain the origin of Fe-Ti-V oxide ore *** experimental results demonstrate that the sandwich-and trellis-type ilmenite lamellae in titanomagnetite of layered intrusions can be formed by the reaction of earlier crystallized ilmenite and the evolved parental *** evolution of parental basaltic magma,the Fe-Ti oxide should be composed of titanomagnetite+ilmenite in the earlier stage,but changed to titanomagnetite+titanomagnetite-ilmenite intergrowth±ilmenite at the later ***,the Panzhihua Fe-Ti oxide ores,which are mainly composed of titanomagnetite,should be formed earlier than the adjacent gabbro,in which titanomagnetite-ilmenite intergrowth is the major form of the Fe-Ti oxide.

关键词： high pressure and high temperature experiment crystallization Fe-Ti oxide layered intrusion high-Ti basalt petrology

Seismic response to natural gas anomalies in crystalline rocks

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Science China Earth Sciences 2008年第12期51卷 1726-1736页

作者： yang WenCai jin zhenmin YU ChangQing Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Facuty of Earth Sciences China University of GeosciencesWuhan 430074China

According to the geological and seismic reflection data of the Chinese Continental Scientific Drilling (CCSD) main-hole (MH), and the anomalies of CH4, CO2, and He are correlated to the three-component seismic reflectors, especially in horizontal component profiles. However, the seismic response is dif-ficult to be explained as the porosity of crystalline rocks is only about 1% in well section where the gas anomalies occur. Seismic velocity measurement of the MH cores indicated that compared with wa-ter-saturated rock samples, seismic velocity (especially the S-wave) could be distinctly decreased by gas contained in tiny cracks despite of the low porosity, and then notable seismic response could be induced in gas-filled crystalline rocks. It could be predicated that if the porosity of certain rocks in the middle crust rose due to water-rock interaction and had natural gas filled, then there would be more probability for natural gas in top of the mid-crust to fill in the crystalline rocks with increased porosity. In such case, based on the decrease of Swave velocity in crystalline rocks, seismic method could be applied in the future to explore natural gas reservoirs in the middle crust.

关键词： scientific drilling crystalline basement gas anomalies in crust seismic reflection petrophysics

Genesis of granulite in Himalayan lower crust:Evidence from experimental study at high temperature and high pressure

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Chinese Science Bulletin 2002年第6期47卷 448-454页

作者： yang.xiaosong.jin zhenmin E.Huenges GAO Shan B.Wunder F.R.Schilling Faculty of Earth Sciences China University of GeosciencesWuhan 430074China GeoForschungsZentrum PotsdamD-14473Germany Institute of Geology China Seismological BureauBeijing 100029China

Here we present an insight into the genesis of Himalayan granulitic lower crust based on the experimental studies on the dehydration melting of natural biotite-plagioclase gneiss performed at the temperatures of 770-980°C and the pressures of 1.0-1.4 GPa. The experiments produce peraluminous granitic melt and residual phase assemblage (Pl+Qz+Gat+Bio+Opx±Cpx+Ilm/Rut±Kfs). The residual mineral assemblage is similar to those of granu-lites observed at the eastern and western Himalayan syntax-ises, and the chemical compositions of characteristic minerals-garnet and pyroxene in the residual phase and the granu-lite are identical. Additionally, the modeled wave velocities of the residual phase assemblage are comparable well with those of the top part of lower crust beneath Himalayas. Hence, we suggest that (1) the top part of lower crust beneath Himalayas is probably made up of garnet-bearing intermediate granulite; (2) the formations of granulite and leucogranites in Himalayas are interrelated as the

关键词： Himalayas granulite gneiss partial melting high-tem-perature and high-pressure experiment.

Reaction Infiltration Instabilities in Partially Molten Peridotite and Implications for Driving the Transport of Sulfide Liquid

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Journal of Earth Science 2020年第3期31卷 447-455页

作者： Zhenjiang Wang zhenmin jin School of Earth Sciences State Key L aboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan 430074China

Reaction infiltration instability(RII)can cause the formation of melt channels and potentially facilitate the physical transport of sulfide liquid,which contributes to the geochemical evolution of chalcophile elements in the lithospheric *** study conducted some two-layer reaction experiments to explore the feasibility of reaction-driven sulfide migration along high-velocity silicate-melt *** increasing duration,the formation of more silicate-melt channels and the transport of more sulfide droplets into a depleted peridotite were observed due to the increase of the local ***,at a longer duration,the presence of some melt-channel relics implies that melt channels are temporary and ultimately closed when the reaction infiltration of silicate melt reached equilibrium in the depleted ***,theoretical calculations indicate that the RII of the system is suppressed,which impedes the formation of melt *** homogeneous distribution of silicate melt in a sulfide-free experiment implies that the Zener pinning of sulfide probably enhances the RII,thereby facilitating the formation of temporary melt ***,this study demonstrates that sufficient silicate melt disequilibrium with solid phases in a liquid source potentially promotes the mechanical extraction of sulfides during reaction infiltration of silicate melt.

关键词： high P-T experiment reaction infiltration instability sulfide liquid transport

Metamorphic Evolution of a Tremolite Marble from the Dabie UHP Terrane,China:A Focus on Zircon

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Journal of Earth Science 2022年第2期33卷 493-506页

作者： Penglei Liu zhenmin jin School of Earth Sciences China University of GeosciencesWuhan 430074China

In this study,a tremolite marble from the Dabie ultrahigh-pressure(UHP)terrane,eastcentral China was investigated for its metamorphic evolution by focusing on *** marble contains an amphibolite-facies assemblage of dolomite,Mg-calcite,tremolite,biotite,and plagioclase,while zircon in the marble witnesses a complex recrystallization and growth history under both amphiboliteand eclogite-facies *** reveals eight characteristic zones for *** indicated by mineral inclusions in zircon,two zones formed no earlier than amphibolite-facies retrogression and are too thin to *** other six zones contain inclusions of dolomite,aragonite,diopside(X_(Na)=Na/(Na+Ca)=0.11-0.14),garnet(X_(Ca)=0.51-0.62,X_(Mg)=0.21-0.23,X_(Fe)=0.17-0.26,X_(Mn)=0.01),phengite and rutile,and formed under eclogite-facies *** equilibria calculations illustrat that the Na-richest diopside formed under UHP *** an accessory eclogite-facies mineral in the marble,the analyzed chemistry of garnet inclusions cannot be reproduced by phase equilibria calculations because solid-solution models for many other minerals don't incorporate *** eclogite-facies zircon zones show low HREE contents and flat MREE-HREE distribution patterns,which are interpreted to have been determined by the low bulk-rock HREE content instead of the presence of accessary garnet in the marble.U-Pb dating yielded a large age dataset ranging from about 250 to 210 Ma for the eclogite-facies zircon ***,the eclogite-facies ages are characterized by a Gaussian distribution with a median peak at 232 *** propose that zircon experienced a“protracted”recrystallization and/or growth history in the tremolite marble during the Triassic subduction and exhumation.

关键词： Dabie UHP marble mineral inclusion recrystallization zoned zircon tectonics

Negative pressure effect on the electrical conductivity of San Carlos olivine and its implication to the electrical structure in the upper mantle

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Science China Earth Sciences 2016年第10期59卷 2078-2088页

作者： CHEN SiBo GUO XinZhuan ZHOU ChunYin jin zhenmin State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Institute of Geophysics and Geomatics China University of Geosciences

Pressure effect on the electrical conductivity of San Carlos olivine was investigated by the newly installed electrical conductivity measurement system at China University of Geosciences. Electrical conductivity of San Carlos olivine aggregates was measured up to 12 GPa and 1475 K using the Walker-type multi-anvil apparatus equipped with eight WC cubes as the second-stage anvils. The pressure generation against applied load for the experimental assemblage was examined by phase transition of Bi, quartz, forsterite under different P-T conditions. To check the data validity of this new system, electrical conductivities of the serpentinites and talc samples were measured. The results are consistent with the published data of the same samples. Electrical conductivity （σ） of the San Carlos olivine aggregates and temperature （T） satisfy the Arrhenian formula： σ=σ0exp[-（△E＋P△V）/kT]. The pre-exponential factor （σ0）, activation energy （AE） and activation volume （AV） yield value of 7.74 S/m, 0.85 eV and 0.94 cm^3/mol, respectively. Electrical conductivities of the San Carlos olivine aggregates decline with increasing pressure at same temperatures. The negative pressure effect can be interpreted by strain energy model of defect energy together with the lattice deformation. In addition, the electrical conductivity-depth 1-D profile of the upper mantle was constructed based on our results and some assumptions. The calculated profile is concordant with the geophysical observation at the depth of 180-350 km beneath Europe, which indicates that the upper mantle beneath Europe might be dry.

关键词： Electrical conductivity San Carlos olivine Pressure effect Upper mantle FT-IR

Solvothermal-assisted assembly of MoS2 nanocages on graphene sheets to enhance the electrochemical performance of lithium-ion battery

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Nano Research 2020年第4期13卷 1029-1034页

作者： Dafang He Yi yang zhenmin Liu jin Shao Jian Wu Shun Wang Liming Shen Ningzhong Bao State Key Laboratory of Material-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing210009China Institute of NBC Defence Beijing 102205China

An ordered hollow M0S2 nanocages/RGO nanocomposite is constructed by a simple solvothermal-assisted assembly method combined with freeze-drying and *** this novel nanostructure,hollow M0S2 nanocages are homogeneously distributed on graphene sheets with a tight bond of *** nanosized and hollow MoS2 nanocages can effectively accommodate the huge volume change during charge/discharge process and increase the number of electrochemical reaction active sites,accelerating the kinetics of lithiation/*** tight C-O-Mo bond between graphene and MoS2 further reinforces the structural stability,thus improve the electrical conductivity and substantially enhance the lithium storage performance of M0S2 anode *** a result,this novel nanocomposite shows a long-cycle stability of 717.4 mAh·g^-1 after 800 cycles at a high current density of 3 A·g^-1,exhibiting great potential as an anode nanocomposite for advanced lithium-ion batteries.

关键词： nanocomposites M0S2 nanocages graphene lithium-ion battery

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 *** we present a systematic microstructural investigation of omphacite using transmission electron microscopy(TEM)in an ultrahigh-pressure(UHP)eclogite sample from Shuanghe,Dabie orogen,*** 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 *** two phases of omphacite have almost the same crystallography orientation and bounded by dislocation *** these dislocation walls,we found some barroisite and albite *** barroisite microcrystals contain large amount of dislocations and show a topological relation with host *** the albite microcrystals contain small amount of dislocations and does not show topological relation with *** 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 ***,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 ***,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 ***,the rest of precursor C2/c omphacite subgrains w

关键词： microstructure omphacite eclogite TEM P-T path

Fabric and Deformation of Omphacite in Dabie Ultra-high-pressure Ecologites

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Acta Geologica Sinica(English Edition) 1999年第4期73卷 411-417页

作者： JIAO Shuqiang jin zhenmin jin Shuyan TAN Zishan Department of Environmental and Resource Engineering Fuzhou University Fujian 350002 Faculty of Earth Sciences China University of Geosciences Wuhan 430074

The rheological characters of omphacites in Dabie ultra-high-pressure eclogite have been studied in terms of fabric, dislocation and micro-structures. 1. The eclogite has undergone high-temperature deformation, thus forming omphacite lattice preferred orientation. In addition to creep dislocation, the omphacite ductile deformation may have other mechanisms, such as diffusion creep and grain boundary migration. 2. The main-phase deformation of eclogite is coaxial, but asymmetry strain also exists due to strain partitioning in the Dabie orogenic belt. 3. The twin measured by the universal stage is (100), indicating that omphacite high-T deformation was superimposed by low-T deformation. 4. Subgrain structure is common in omphacite, but the deformation features of the omphacites in the Shuanghe area and Bixiling area are different, the latter being dominated by dynamic recrystallization. 5. The Flinn plots show that the strain of omphacite belongs to the constriction ellipsoid and stretching strain, which is similar to the result of the omphacite fabric analysis.

关键词： omphacite fabric ultra-high-pressure eclogite rheology