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The occurrence, origin, and fate of water in chromitites in ophiolites

文献类型：期刊论文

作者Su, Ben-Xun1,2,3; Robinson, Paul T.3; Chen, Chen1,2,3; Xiao, Yan2,8; Melcher, Frank7; Bai, Yang1,2,3; Gu, Xiao-Yan6; Uysal, Ibrahim5; Lenaz, Davide4
刊名AMERICAN MINERALOGIST
出版日期2020-06-01
卷号105期号:6页码:894-903
关键词Podiform chromitite clinopyroxene olivine ophiolite water
ISSN号0003-004X
DOI10.2138/am-2020-7270
英文摘要We present petrological investigations and mineral chemistry of several Tethyan ophiolites to reveal the occurrence, origin, and fate of water in podiform chromitites. The results show that clinopyroxene and olivine in chromitites have H2O contents of 801-366 and 53-17 ppm, respectively. The highest water contents of olivine occur in massive chromitite and the lowest always in the clinopyroxenebearing ores because much of the available hydrous fluids was taken up by the clinopyroxene during crystallization. The major and trace elemental and Li isotopic compositions of clinopyroxene associated with chromite and olivine in podiform chromitites indicate formation from a mixture of surface hydrous fluids on chromite grains and evolved melts from which olivine crystallized. The hydrous fluids initially originated from dehydration of a subducting slab as revealed by Li isotopic compositions of clinopyroxene and olivine in the chromitites. High fluid/rock ratios facilitated concentration of chromite to form chromitite, suppressing crystallization of olivine. The hydrous fluids that were collected on the chromite grain surface during crystallization allowed chromite grains to rise via decreasing density in the form of bubbles, thus promoting their gathering and concentration. The fate of these hydrous fluids depends on ambient physical and chemical conditions. Mostly they hydrate adjacent olivine grains in the chromitite or penetrate the surrounding dunite envelope. In some cases, the fluids dissolve into silicate melts to produce water-bearing clinopyroxene and/or hydrous minerals, such as amphibole, or infiltrate silicate and chromite grains to form inclusions, which may exsolve later in the form of mineral lamellae. Our investigations provide direct natural evidence for the presence and importance of water in the formation and evolution of chromite deposits, as inferred by earlier experimental studies.
WOS关键词POZANTI-KARSANTI OPHIOLITE ; NORTHERN OMAN OPHIOLITE ; LUOBUSA OPHIOLITE ; PODIFORM CHROMITITES ; HYDROTHERMAL CIRCULATION ; ISOTOPE FRACTIONATION ; QUANTITATIVE-ANALYSIS ; OCEANIC LITHOSPHERE ; TETHYAN OPHIOLITES ; KIZILDAG OPHIOLITE
资助项目National Natural Science Foundation of China[91755205] ; National Natural Science Foundation of China[41772055] ; State Key Laboratory of Lithospheric Evolution[201701] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2016067]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000540324900009
出版者MINERALOGICAL SOC AMER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; State Key Laboratory of Lithospheric Evolution ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Youth Innovation Promotion Association, Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/96895]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Su, Ben-Xun
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
4.Univ Trieste, Dept Math & Geosci, Via Weiss 8, I-34128 Trieste, Italy
5.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey
6.Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Peoples R China
7.Univ Leoben, Chair Geol & Econ Geol, A-8700 Leoben, Austria
8.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Su, Ben-Xun,Robinson, Paul T.,Chen, Chen,et al. The occurrence, origin, and fate of water in chromitites in ophiolites[J]. AMERICAN MINERALOGIST,2020,105(6):894-903.
APA Su, Ben-Xun.,Robinson, Paul T..,Chen, Chen.,Xiao, Yan.,Melcher, Frank.,...&Lenaz, Davide.(2020).The occurrence, origin, and fate of water in chromitites in ophiolites.AMERICAN MINERALOGIST,105(6),894-903.
MLA Su, Ben-Xun,et al."The occurrence, origin, and fate of water in chromitites in ophiolites".AMERICAN MINERALOGIST 105.6(2020):894-903.

入库方式： OAI收割

来源：地质与地球物理研究所

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