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CO_2 Density-Raman Shift Relation Derived from Synthetic inclusions in Fused Silica Capillaries and its Application

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Acta Geologica Sinica(English Edition) 2009年第5期83卷 932-938页

作者： SONG Yucai chou i＇ming HU Wenxuan Burruss ROBERT LU Wanjun institute of Geology China Academy of Geological Sciences Beijing 100037 China Department of Earth Sciences Nanjing University Nanjing 210093 China US Geological Survey National Center Reston VA 20192 USA State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074 China

The densities of CO2 inclusions in minerals are commonly used to determine the crystallizing conditions of the host minerals. However, conventional microthermometry is difficult to apply for inclusions of small size （〈 5-10 μm） or low density. Raman analysis is an alternative method for determining CO2 density, provided that the CO2 density-Raman shift relation is known. This study aims to establish this CO2 density-Raman shift relation by using CO2 inclusions synthesized in fused silica capillaries. By using this newly-developed synthetic technique, we formed pure CO2 inclusions, and their densities were determined by microthermometry. The Raman analysis showed that the relation between CO2 density （D in g/cm^3） and the separations （△ in cm^-1） between the two main bands （i.e. Fermi diad bands） in CO2 Raman spectra can be represented by a cubic equation： D （g/cm^3）=0.74203（-0.019^3＋5.90332△^2-610.79472△＋21050.30165）-3.54278 （r^2=0.99920）. Our calculated D value for a given A is between those obtained from two previously-reported equations, which were derived from different experimental methods. An example was given in this study to demonstrate that the densities of natural CO2 inclusions that could not be derived from microthermometry could be determined by using our method.

关键词： synthetic fluid inclusion fused silica capillary COz inclusion C02 density equation,Raman analysis

Redox Control and Measurements in Hydrothermal Experiments

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矿物学报 2013年第S2期33卷 561-561页

作者： chou i-ming Laboratory for Experimental Study Under Deep-sea Extreme Conditions Sanya Institute of Deep-sea Science and EngineeringChinese Academy of Sciences

For minerals containing multivalent elements,their stabilities depend not only on pressure(P),temperature(T),and bulk chemical composition,but also the redox *** applies to many ore forming minerals,such that the redox state and its fluctuations in hydrothermal systems have long been considered as important controlling factors for the transport and deposition of ores.

关键词： redox minerals hydrothermal kinetics sealed permeation dissociation mentioned capsule adding

西藏朱诺斑岩型Cu-Mo矿床成矿斑岩金红石成因及找矿指示意义

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地质学报 2018年第6期92卷 1228-1239页

作者：戴婕倪师军黄勇丁俊周义明中国地质调查局成都地质调查中心成都610081 国土资源部沉积盆地与油气资源重点实验室成都610081 成都理工大学成都610059 中国科学院三亚深海科学与工程研究所海南三亚572000

西藏冈底斯成矿带南缘西段新发现的朱诺铜矿床是具有大型规模的斑岩铜钼矿床。金红石是斑岩铜矿床中最典型的副矿物之一,对其成分和结构特征的研究能反演成矿流体演化过程并确定斑岩铜矿的主矿体。在详细的野外地质观察的基础上,对钾化... 详细信息

西藏冈底斯成矿带南缘西段新发现的朱诺铜矿床是具有大型规模的斑岩铜钼矿床。金红石是斑岩铜矿床中最典型的副矿物之一,对其成分和结构特征的研究能反演成矿流体演化过程并确定斑岩铜矿的主矿体。在详细的野外地质观察的基础上,对钾化带成矿斑岩(黑云花岗闪长岩)中金红石的研究表明:金红石主要与磁铁矿(Ⅰ类)、赤铁矿共生(Ⅲ类),常形成固溶体分离结构并分布在黑云母裂隙及附近;其次呈板状(长10~80μm,宽3~10μm)、颗粒状(粒径10~40μm)、不规则状独立分布在石英硫化物脉中(Ⅱ类)。Ⅰ类金红石是由钛磁铁矿在富S条件下反应形成的;Ⅲ类金红石由钛铁矿在富氧条件下反应形成的;Ⅱ类金红石是由含Ti的热液结晶沉淀而来的。成矿斑岩全岩中TiO_2的含量为0.66%,为金红石的形成提供了丰富的物源。成矿斑岩金红石中的电子探针分析结果显示,其成分除含有约94%的TiO_2外,还含有V_2O_3,Nb_2O_5,FeO,WO_3,CaO,SiO_2,Al_2O_3,ZrO_2,几乎不含或很少含MgO和MgO。金红石中V_2O_3范围为0.20%~2.39%,平均为0.49%,Nb2O5的含量范围为0.20%~4.63%,平均1.25%,WO_3和FeO的平均含量分别为1.92%和1.81%,且有约0.05%的ZrO_2异常。利用金红石找矿方法开展朱诺矿床外围找矿时,首先必须考虑金红石中V_2O_3的含量(>0.2%,Ⅱ类金红石>0.5%),在此基础上考虑Nb的含量(>0.2%,乙类金红石>2.6%),同时考虑W,Fe偏高,Zr异常的特点。对Ⅱ类金红石还需要额外考虑其粒径大于10μm。

关键词：成矿斑岩金红石成因找矿指示意义斑岩型Cu-Mo矿床西藏朱诺

The Perspective of Deep-sea Science Research and the Establishment of Modern Hydrothermal Laboratories in China

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地质学报 2013年第S1期 3-4页

作者： i-ming chou Laboratory for Experimental Study Under Deep-sea Extreme Conditions Sanya Institute of Deep-sea Science and Engineering Chinese Academy of Sciences

in addition to the outer space, sea floor is another frontier for current and future human explorations. The successful dive of manned submersible Jiaolong at the depth of 7062 m last summer(Cui et al., 2013) was one ...

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in Situ Measurements of the Raman Shifts for ν1 Symmetric Stretching Band of CH4 Between-180 and 350°C with Densities up to 0.45 g/cm3 in Optical Cells with Fused Silica Windows

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地质学报 2013年第S1期 333-334页

作者： SHANG Linbo i-ming chou HU Ruizhong Bi Xianwu State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Laboratory for Experimental Study Under Deep-sea Extreme Conditions Sanya Institute of Deep-sea Science and Engineering Chinese Academy of Sciences

ThepeakpositionsoftheCH4 Ramanν1symmetricstretchingbandhavebeendeterminedat temperaturesbetween-180and350 oCwithdensities up to 0.45 g/cm3 in a high-pressure optical cell (HPOC;chou et al., 2005) and a fused silica c...

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in situ observations and quantitative Raman spectroscopic analyses of samples in high-pressure optical cells in hydrothermal experiments

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Science Bulletin 2021年第19期66卷 1933-1935,M0003页

作者： i-ming chou Key Lab of Experimental Study under Deep-sea Extreme Conditions Institute of Deep-sea Science and EngineeringChinese Academy of SciencesSanya 572000China

in 2011,through in situ Raman spectroscopic analyses of samples in a high-pressure optical cell(HPOC),called"hydrothermal diamond-anvil cell"(HDAC)[1]the■was recognized as a stable trisulfur radical ion in geological fluids at elevated temperatures(T)and pressures(P)[2].Later,the stability and abundance of this■ion in hydrothermal fluids were further investigated by using another type of HPOC called"fused silica capillary capsule"[3]together with Raman spectroscopy[4].

关键词：实验样品高压腔 fused

Oldhamite:a new link in upper mantle for C-O-S-Ca cycles and an indicator for planetary habitability

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National Science Review 2023年第10期10卷 44-53页

作者： Yuegao Liu i-ming chou Jiangzhi Chen Nanping Wu Wenyuan Li Leon Bagas minghua Ren Zairong Liu Shenghua Mei Liping Wang CAS Key Laboratory for Experimental Study under Deep-sea Extreme Conditions Institute of Deep-sea Science and Engineering Chinese Academy of Sciences Hainan Deep-Sea Technology innovation Center Xi'an Center of Geological Survey China Geological Survey Department of Geoscience University of Nevada Academy for Advanced interdisciplinary Studies Southern University of Science and Technology

in the solar system,oldhamite(CaS) is generally considered to be formed by the condensation of solar nebula *** chondrites,one of the most important repositories of oldhamite,are believed to be representative of the material that formed ***,the formation mechanism and the evolution process of oldhamite are of great significance to the deep understanding of the solar nebula,meteorites,the origin of Earth,and the C-O-S-Ca cycles of *** now,oldhamite has not been reported to occur in mantle ***,here we show the formation of oldhamite through the reaction between sulfide-bearing orthopyroxenite and molten CaCO3at 1.5 GPa/1510 K,0.5 GPa/1320 K,and 0.3 GPa/1273 ***,this reaction occurs at oxygen fugacities within the range of upper-mantle conditions,six orders of magnitude higher than that of the solar nebula *** is easily oxidized to CaSO4or hydrolysed to produce calcium *** oxygen fugacity of magma,extremely low oxygen content of the atmosphere,and the lack of a large amount of liquid water on the celestial body’ s surface are necessary for the widespread existence of oldhamite on the surface of a celestial body otherwise,anhydrite or gypsum will exist in large *** may exist in the upper mantle beneath mid-ocean ***,oldhamites may have been a contributing factor to the early Earth’s atmospheric hypoxia environment,and the transient existence of oldhamites during the interaction between reducing sulfur-bearing magma and carbonate could have had an impact on the changes in atmospheric composition during the Permian-Triassic Boundary.

关键词： oldhamite middle-ocean ridge large igneous province Great Oxidation Event oxygen fugacity

integration of a fused silica capillary and in-situ Raman spectroscopy for investigating CO_(2) solubility in n-dodecane at near-critical and supercritical conditions of CO_(2)

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Petroleum Science 2022年第6期19卷 3124-3133页

作者： Jun-Liang Wang Zi-Hao Song Lin-Jun Li Li-Li Yang Quan-Yuan Wang i-ming chou Zhi-Yan Pan College of Environment Zhejiang University of TechnologyHangzhouZhejiang310032China Hangzhou Academy of Environmental Protection HangzhouZhejiang310032China Laboratory for Experimental Study Under Deep-sea Extreme Conditions Institute of Deep-sea Science and EngineeringChinese Academy of SciencesSanyaHainan572000China

To determine the solubility of CO_(2)in n-dodecane at T=303.15-353.15 K,P≤11.00 MPa,an integrated fused silica capillary and in-situ Raman spectroscopy system was *** Raman peak intensity ratio(i_(CO_(2))/iC-H)between the upper band of CO_(2)Fermi diad(i_(CO_(2)))and the C-H stretching band of n-dodecane(iC-H)was employed to determine the solubility of CO_(2)in n-dodecane based on the calibrated correlation equation between the known CO_(2)molality in n-dodecane and the i_(CO_(2))/iC-Hratio with R^(2)=*** results indicated that the solubility of CO_(2)decreased with increasing temperature and increased with increasing *** maximum CO_(2)molality(30.7314 mol/kg)was obtained at 303.15 K and7.00 ***,a solubility prediction model(lnS=(P-A)/B)based on the relationship with temperature(T in K)and pressure(P in MPa)was developed,where S is CO_(2)molality,A=-8×10^(-6)T^(2)+0.0354T-8.1605,and B=*** results indicated that the solubilities of CO_(2)derived from this model were in good agreement with the experimental data.

关键词： CO_(2)solubility n-dodecane Raman spectroscopy Fused silica capillary in-situ

Structural stability of methane hydrate at high pressures

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Geoscience Frontiers 2011年第1期2卷 93-100页

作者： i.-ming chou Russell J.Hemley Ho-kwang Mao 954 National Center U.S.Geological SurveyRestonVA 20192USA Geophysical Laboratory Carnegie Institution of WashingtonWashingtonDC 20015USA

The structural stability of methane hydrate under pressure at room temperature was examined by both in-situ single-crystal and powder X-ray diffraction techniques on samples with structure types i, ii, and H in diamond-anvil ceils. The diffraction data for types ii （sli） and H （sH） were refined to the known structures with space groups Fd3m and P63/mmc, respectively. Upon compression, sl methane hydrate transforms to the sll phase at 120 MPa, and then to the sH phase at 600 MPa. The sli methane hydrate was found to coexist locally with si phase up to 500 MPa and with sH phase up to 600 MPa. The pure sH structure was found to be stable between 600 and 900 MPa. Methane hydrate decomposes at pressures above 3 GPa to form methane with the orientationally disordered Fm3m structure and ice Vii （Pn3m）. The results highlight the role of guest （CH4）-host （H2O） interactions in the stabilization of the hydrate structures under pressure.

关键词： Methane hydrate Structural stability High pressure