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An experimental determination of W,Nb,and Ta partition coefficients between P-rich peraluminous granitic melt and coexisting aqueous fluid

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Chinese Journal Of Geochemistry 2015年第2期34卷 194-200页

作者： Yong Tang Hui Zhang laboratory for high temperature and high pressure study of the earth's interior Institute of GeochemistryChinese Academy of Sciences

The partition coefficients of W,Nb,and Ta between the P-rich peraluminous granitic melt and the coexisting aqueous fluid were determined at 800-850 °C and 0.5-1.5 *** experimental results showed that the partition coefficients D_w,D_(Nb) and D_(Ta)(D_i^(v/m) = C_i^V/C_i^m,where C_i^V and C_i^m denote the concentrations of an element,i,in the aqueous fluid and the melt,respectively) were less than *** partition coefficients were affected by pressure,but there was no evidence for the complexation of P2O5 with these elements in the granitic melt or aqueous fluid,except for with W in the *** results showed that W,Nb,and Ta tended to partition into the granitic melt and,in the late period of crystallization of P-rich magma,they formed independent minerals.

关键词：分配系数实验测定水流体过铝质熔体 Nb 共存钽

Trace element composition in tuite decomposed from natural apatite in high-pressure and high-temperature experiments

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science China earth sciences 2014年第12期57卷 2922-2927页

作者： ZHAI shuangMeng XUE WeiHong Daisuke YAMAZAKI MA Fang key laboratory of high-temperature and high-pressure study of the earth's interior Institute of GeochemistryChinese Academy of Sciences school of earth and space sciences Peking University Institute for study of the earth's interior Okayama University

Tuite has been suggested as a potential reservoir for trace elements in the deep mantle,but no evidence confirms this *** using a natural apatite as starting material,the trace-element-bearing tuite large crystals were obtained under highpressure and high-temperature conditions(15 GPa and 1800 K).X-ray diffraction pattern and Micro-Raman spectrum of the run product confirm that tuite was *** concentrations of trace elements in tuite crystals were analyzed by laser ablation-inductively coupled plasma-mass spectrometry(LA-ICP-Ms).The rare earth element patterns of tuite show enrichment of light rare earth elements relative to heavy rare earth *** shows high concentrations of Th and sr,and negative anomalies of Rb,Nb,and *** results show that tuite can accommodate a large amount of trace *** might be an important host to accommodate trace elements if there is much apatite subducted into the deep mantle.

关键词： tuite trace elements high-pressure and high-temperature

Electrochemical behavior of pyrite in acidic solution with different concentrations of NaCl

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Chinese Journal Of Geochemistry 2014年第4期33卷 374-381页

作者： LIN sen LIU Qingyou LI Heping laboratory for high temperature & high pressure study of the earth’s interior Institute of Geochemistry Chinese Academy of Sciences University of Chinese Academy of sciences

The role of chloride ions in metal sulfides leaching has been well established by researchers, the complexation of chloride ions was considered to be the main effect of chloride ions. In this work, the complexation of chloride ions was neglected by addition of EDTA, a strong complexing agent. In this way, further study was conducted on the effect of chloride ions. The increase of chloride ions concentration from 0 to 2 mol/L, decreased the open circuit potential of pyrite from 264 to 91 m V. Unless otherwise stated, all potentials in this paper are based on the potential of saturated calomel electrode. At 600 m V, the increase of chloride ions concentration acceleraed pyrite oxidation; at 800 and 1000 m V, however, the increase of chloride ions concentration lowered pyrite oxidation rate, and the proportion of elemental sulfur was also decreased with increasing chloride ions concentration; when chloride ions concentration increased from 0 to 2 mol/L, the proportion of elemental sulfur decreased from 32% to 28.4% at 800 m V, and 7.1% to 2.4% at 1000 m V.

关键词：氯离子浓度黄铁矿电化学行为酸性溶液氯化钠金属硫化物络合剂研究人员

Influence of anisotropy on the electrical conductivity and diffusion coefficient of dry K-feldspar： Implications of the mechanism of conduction

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Chinese Physics B 2018年第2期27卷 630-639页

作者：代立东胡海英李和平孙文清蒋建军 key laboratory of high-temperature and high-pressure study of the earth interior Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China University of Chinese Academy of sciences Beijing 100049 China

The electrical conductivities of single-crystal K-feldspar along three different crystallographic directions are investigated by the solartron-1260 Impedance/Gain-phase analyzer at 873 K–1223 K and 1.0 GPa–3.0 GPa in a frequency range of 10-1 Hz–106 Hz. The measured electrical conductivity along the ⊥ [001] axis direction decreases with increasing pressure, and the activation energy and activation volume of charge carriers are determined to be 1.04 ± 0.06 e V and 2.51 ± 0.19 cm~3/mole, respectively. The electrical conductivity of K-feldspar is highly anisotropic, and its value along the⊥ [001] axis is approximately three times higher than that along the ⊥ [100] axis. At 2.0 GPa, the diffusion coefficient of ionic potassium is obtained from the electrical conductivity data using the Nernst–Einstein equation. The measured electrical conductivity and calculated diffusion coefficient of potassium suggest that the main conduction mechanism is of ionic conduction, therefore the dominant charge carrier is transferred between normal lattice potassium positions and adjacent interstitial sites along the thermally activated electric field.

关键词： electrical conductivity and diffusion coefficient K-feldspar anisotropy conduction mechanism

Geochemical and geochronological studies of the Aketas granite from Fuyun County, Xinjiang: the implications of the petrogenesis and tectonic setting

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Chinese Journal Of Geochemistry 2015年第4期34卷 579-591页

作者： Xiaofeng Wei Xin Zhang Jiuhua Xu Rufu Ding Guorui Zhang Yong Tang University of science and Technology Beijing Beijing Institute of Geology for Mineral Resources key laboratory of high-temperature and high-pressure study of the earth’s interior Institute of GeochemistryChinese Academy of Sciences

As the wall rock of the Aketas gold deposit,the Aketas granite is about 45 km away from Fuyun County, Xinjiang Province. The zircon weighted mean U–Pb age of the Aketas granite is 309.0 ± 4.7 Ma, indicating that the Aketas granite was emplaced during the late Carboniferous. The Aketas granite belongs to the high-K calcalkaline series, with si O2 content from 63.00 to 68.20 %,K2 O content from 3.06 to 4.49 % and Na2 O content from4.14 to 6.02 %. The Alkaline Ratio(AR) of the Aketas granite is high, from 1.89 to 3.47, and is 2.95 on *** Aketas granite has lowPREE(92.42–122.73 ppm)and highPLREE/PHREE ratios(6.54–11.88). For the trace elements, the Aketas granite is enriched in LILE(Rb,U, Th, K) and incompatible elements, and marked depleted in HFsE(Nb, Ta, P, Ti). The geochemical characteristics of the Aketas granite suggest that it is a typical I-type and volcanic arc granite, and that the crystallization of clinopyroxene and hornblende is notable during the magmatic evolution. In combination with the regional tectonic studies, we propose that the emplacement of the Aketas granite implies the Altai and East Junggar area was still dominated by a subduction system at *309 Ma.

关键词：花岗岩地球化学同位素年代学富蕴县构造背景新疆高钾钙碱性系列成因

First-Principles Calculations about Elastic and Li^(+) Transport Properties of Lithium superoxides under high pressure and high temperature

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Chinese Physics Letters 2022年第2期39卷 47-52页

作者： Yufeng Li shichuan sun Yu He Heping Li key laboratory of high-temperature and high-pressure study of the earth’s interior Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of sciences Beijing 100049China Center for high pressure science and Technology Advanced Research Shanghai 201203China

Lithium superoxides,Li_(2)O_(3),LiO_(2),and LiO_(4),have been synthesized under high *** materials have potential applications in energy storage ***,we use first-principles calculations to investigate the elastic and Li^(+) transport properties of these oxides at high pressure and high *** elastic constants are calculated at 20-80 GPa,and they satisfy the Born stability criteria,indicating the good mechanical stability of these *** sound velocities calculated with elastic constants are close to each other,but difference in velocity anisotropy is ***_(2) presents significant shear sound wave anisotropy over 80%.The Li^(+) transport properties are investigated using first principles molecular dynamics(FPMD)and climbing-image nudged elastic band *** lowest Li^(+) migration barrier energies increase from 0.93,0.86 and 1.22 eV at 20 GPa to 1.43,1.12 and 1.77 eV at 50 GPa for Li_(2)O_(3),LiO_(2),and LiO_(4),*** most favorable path for LiO_(2) and LiO_(4) is along the[001]*** FPMD results suggest that these oxides become unstable with increasing temperature up to 2000 K due to O-O dimer clusters in these ***,a superionic transition is not observed in the simulations.

关键词： temperature anisotropy Lithium

Thermal Diffusivity of Lherzolite at high pressures and high temperatures Using Pulse Method

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Journal of earth science 2019年第1期30卷 218-222页

作者： sheqiang Miao Yongsheng Zhou Heping Li state key laboratory of earthquake Dynamics Institute of geologyChina Earthquake Administration CAs key laboratory of high-temperature and high-pressure study of the earth's interior Institute of Geochemistry Chinese Academy of Sciences

Lherzolite is one of the most important components of the subcontinental mantle lithosphere, and the study of its heat transfer properties aids in understanding the thermal structure of the continental mantle lithosphere. Currently, few studies have examined the heat transfer properties of lherzolite, and the experimental results remain controversial. This experiment utilized a pulse method to measure the thermal diffusivity of lherzolite at pressures ranging from 1.0 to 4.0 GPa and temperatures from 300 to 1 073 K on a cubic press apparatus. We obtained a thermal diffusivity for lherzolite of approximately 2.10 mm^2s^(-1) at ambient condition. The experimental pressure derivative of the thermal conductivity of lherzolite decreased with temperature, reaching approximately 10% at high temperature, a value higher than the previously reported 4%, which indicates that the temperature gradient of the upper mantle lithosphere is smaller than previously thought. Therefore, concerning calculation of the lithosphere thickness using the thermal conductivity of the lherzolite, the previous calculation using pressure derivative of the thermal conductivity of 4% may cause an underestimation of the upper mantle lithosphere thickness by approximately 6% in a first approximation.

关键词： thermal diffusivity lherzolite pulse method pressure derivative

Geochemistry,petrogenesis and tectonic significance of the late Triassic A-type granite in Fujian,south China

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Acta Geochimica 2017年第2期36卷 166-180页

作者： Dawei Cai Jingyu Zhao Yong Tang Hui Zhang Yunlong Liu Zhenghang Lv key laboratory for high temperature and high pressure study of the earth's interior Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China University of Chinese Academy of sciences Beijing 100049 China

The late Permian–Triassic granites in southeastern China have important tectonic significance for the evolution of south China. Here, we present the detailed geochronological, geochemical and petrological analyses for the Jinlongyan(JLY) granite in northwest Fujian Province, southeast China. LA–ICP–Ms zircon U–Pb dating yielded a weighted average ^(206)Pb/^(238)U age of 224.1 ±3.3 Ma. The granite is mainly comprised of K-feldspar,plagioclase, quartz, biotite and minor amphibole. It is characterized by enrichments in Rb, Th, REEs(total REE = 295.1–694.3 ppm), and HFsEs(e.g., Zr = 289–520 ppm, Hf = 9.3–15.0 ppm, Y = 36.2–68.2 ppm) but depletions in Ba, sr, Eu and Ti. The granite is metaluminous to weakly peraluminous and show a clear A-type granite geochemical signature with high siO_2(70.89 wt%–75.76 wt%), total alkalis(Na_2O + K_2O = 7.51 wt%–8.72 wt%), Ga/Al ratios(10000 Ga/Al = 2.72–3.43). Insitu zircon Hf isotope analysis shows their eHf(t) values ranging from-7.2 to-3.2, with Mesoproterozoic T2DM ages(1308–1525 Ma). Whole-rock Nd isotope data show their eNd(t) values in the range of-9.5 to-9.1 and yield paleoproterozoic TDMages(1606–1985 Ma). These characteristics indicate that the JLY A-type granite magma was formed by the partial melting of Meso-Paleoproterozoic crust rocks in the Cathaysia Block. Our study of the JLY A-type granite, together with other Triassic A-type granitesin south China, defines an extensional environment in the late Triassic which probably was caused by the collision of the south China Block with Indochina Block.

关键词： A-type granite U-Pb dating sr-Nd-Hfisotope Late Triassic Fujian Province

Diffusion in garnet： a review

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Acta Geochimica 2018年第1期37卷 19-31页

作者： Bowen Li Jianhua Ge Baohua Zhang key laboratory for high-temperature and high-pressure study of the earth's interior Institute of GeochemistryChinese Academy of Sciences Guiyang 550081 China University of Chinese Academy of sciences Beijing 100049China

With improvements on high-pressure experimental techniques in multi-anvil apparatus and the development of new analytical tools, major progress has been made on diffusion in garnets in the past several decades. The data obtained in the experimental determination of diffusion coefficients in garnets are of fundamental importance for diffusion modeling and timescales of geological and planetary processes. In this review, we have compiled experimental data on self-diffusion(si, O, cations), trace element diffusion(Li, Y, Ga, Cr, sr, REEs), and interdiffusion(Ca–Fe/Mg, si–Al) in garnet in the light of new advances and recent applications. In addition, some empirical relationships among diffusion parameters(pre-exponential factor D_0,activation energy E, ionic radius) are also discussed. We hope that this review can provide a useful data digest and guide to future study of diffusion in garnet.

关键词： high temperature and high pressure Diffusion Garnet Point defects