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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

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Thermoelasticity and stability of natural epidote at high pressure and high temperature:Implications for water transport during cold slab subduction

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Geoscience Frontiers 2021年第2期12卷 921-928页

作者： Bo Li Jingui Xu Dongzhou Zhang Zhilin Ye Shijie Huang Dawei Fan Wenge Zhou Hongsen Xie 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 Hawaii Institute of Geophysics and Planetology School of Ocean and Earth Science and TechnologyUniversity of Hawaii at ManoaHonoluluHI96822USA

Epidote is a typical hydrous mineral in subduction ***,we report a synchrotron-based single-crystal X-ray diffraction(XRD)study of natural epidote[Ca1.97Al2.15Fe0.84(SiO4)(Si2O7)O(OH)]under simultaneously high pressure-temperature(high P-T)conditions to~17.7 GPa and 700 *** phase transition occurs over this P-T *** the third-order Birch-Murnaghan equation of state(EoS),we fitted the pressure-volume-temperature(P-V-T)data and obtained the zero-pressure bulk modulus K_(0)=138(2)GPa,its pressure derivative K'_(0)=3.0(3),the temperature derivative of the bulk modulus((∂K/∂T)P=-0.004(1)GPa/K),and the thermal expansion coefficient at 300 K(α_(0)=3.8(5)×10^(-5)K^(-1)),as the zero-pressure unit-cell volume V_(0)was fixed at 465.2(2)Å^(3)(obtained by a single-crystal XRD experiment at ambient conditions).This study reveals that the bulk moduli of epidote show nonlinear compositional *** discussing the stabilization of epidote and comparing its density with those of other hydrous minerals,we find that epidote,as a significant water transporter in subduction zones,may maintain a metastable state to~14 GPa along the coldest subducting slab geotherm and promote slab subduction into the upper mantle while favoring slab stagnation above the 410 km ***,the water released from epidote near 410 km may potentially affect the properties of the 410 km seismic discontinuity.

关键词： Epidote Hydrous mineral Subduction zone high-pressure and high-temperature Single-crystal X-ray diffraction

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Organic matter evolution under high-pressure and high-temperature:Evidence from carbon isotope ratios of alkanes In aqueous lignite pyrolyzates

Organic matter evolution under high-pressure and high-temper...

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第十届全国有机地球化学学术会议

作者： Keiji Takemura Institute of Geothermal Science Kyoto UniversityBeppu 874-0903Japan

＜正＞ This paper provides better insights into the carbon isotope distributionamong individual molecular compounds of n-alkanes （IMCAs） and preservationof organic matter under high pressure and temperature （HPT） and discussesthe HPT effects on the carbon isotopic fractionation and evolution ofalkanes based on aqueous pyrolyses of lignite at HPT. δ13C values ofIMCAs （n-C14 to n-C29） in abstracts from the original lignite range from - 36.9‰to - 29.2‰, which are

关键词： Stable carbon isotope high-pressure and high-temperature hydrous pyrolysis molecular compound alkanes lignite

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high-pressure Raman study of MgV_2O_6synthesized at highpressure and high temperature

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Chinese Physics B 2013年第6期22卷 472-474页

作者：唐瑞莲李岩陶强李娜娜李会韩丹丹朱品文王欣 State Key Laboratory of Superhard Materials Jilin University College of Physics Jilin University

A new structural phase of MgV2O6 was obtained by a high-pressure, high-temperature （HPHT） synthesis method. The new phase was investigated by the Rietveld analysis of X-ray powder diffraction data, showing space group Pbcn （No. 60） symmetry and a = 13.6113（6）A （1A =0.1 nm）, b = 5.5809（1）A, c = 4.8566（3）A, V = 368.93（2）A3 （Z = 4）. high pressure behavior was studied by Raman spectroscopy at room temperature. Under 22.5 GPa, there was no sign of a structural phase transition in the spectra, demonstrating stability of the HPHT phase up to the highest pressure.

关键词： high-pressure and high-temperature MgV2O6 Raman spectroscopy high-pressure

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Thermal equation of state of a natural kyanite up to 8.55 GPa and 1273 K

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Matter and Radiation at Extremes 2016年第5期1卷 269-276页

作者： Qiang He Xi Liu Baosheng Li Liwei Deng Wei Liu Liping Wang Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education of ChinaBeijing 100871China School of Earth and Space Sciences Peking UniversityBeijing 100871China Institute of Fluid Physics China Academy of Engineering PhysicsMianyang 621900China Mineral Physics Institute Stony Brook UniversityStony BrookNY 11794-2100USA Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China high pressure Science and Engineering Center and Department of Physics and Astronomy University of NevadaLas VegasNV 89154USA

The thermal equation of state of a natural kyanite has been investigated with a DIA-type,cubic-anvil apparatus(SAM85)combined with an energy-dispersive synchrotron X-ray radiation technique up to 8.55 GPa and 1273 *** phase transition was observed in the studied pressure-temperature(P-T)*** Le Bail full profile refinement technique was used to derive the unit-cell *** fixing the bulk modulus K 0 as 196 GPa and its pressure derivative K0 as 4,our P-V(volume)-T data were fitted to the high temperature BircheMurnaghan equation of *** obtained parameters for the kyanite are:V_(0)=294.05(9)Å^(3),a=2.53(11)×10^(-5)K^(-1) and(K/T)P=-0.021(8)GPa∙K^(-1).These parameters have been combined with other experimentally-measured thermodynamic data for the relevant phases to calculate the P-T locus of the reaction kyanite¼stishoviteþ*** this thermodynamically constrained phase boundary,previous high-pressure phase equi-librium experimental studies with the multi-anvil press have been evaluated.

关键词： Kyanite X-ray diffraction Thermal equation of state high-pressure and high-temperature Kyanite decomposition Thermodynamic calculation

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