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Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine

文献类型：期刊论文

作者Su, Benxun1,2,3; Zhou, Meifu4; Jing, Jiejun1,2,3; Robinson, Paul T.1,4; Chen, Chen1,2,3; Xiao, Yan3,5; Liu, Xia1,2,3; Shi, Rendeng6; Lenaz, Davide7; Hu, Yan8
刊名SCIENCE BULLETIN
出版日期2019-01-30
卷号64期号:2页码:108-121
ISSN号2095-9273
关键词Chromite Olivine Ophiolite Trace element Tibet
DOI10.1016/j.scib.2018.12.018
英文摘要To investigate the factors controlling the mineralization in ophiolites we systematically compared the petrology and mineral compositions of the harzburgites/lherzolites, dunites and chromitites in the Luobusa and Purang ophiolites. Generally, the petrological features and trace element compositions of chromite and olivine in peridotite and chromitite are distinctly different between the two ophiolites. In Luobusa, boninitic melts are inferred to have interacted with the harzburgites and modified the distributions of some trace elements (e.g., Ni, Mn and V) in chromite and olivine. The subsequently formed dunites and chromitites experienced significant elemental exchange. In contrast, the Purang ophiolite contains a wider range of chromitite compositions and records diverse melt activities, such as the growth of relatively abundant secondary clinopyroxene. The metasomatic melts were enriched in Al and depleted in Si, Na and highly incompatible trace elements (e.g., Nb, Zr). Such melts resemble MORB-like melts proposed in the literature but are assumed to be more hydrous than typical MORB because of presence of hydrous minerals. The parental magmas of the Purang dunites and intermediate chromitites are inferred to be compositionally intermediate between boninitic and MORB-like melts. In addition, the more refractory nature of the Luobusa harzburgites facilitated a high Cr concentration gradient with the interacting melts, making it easier to increase Cr in the melts. Crystallization of clinopyroxene and amphibole in the Purang ophiolite accommodated significant amounts of Cr and water, respectively, and negatively affected Cr concentration and chromite crystallization. The concentration of chromite to form chromitites requires the presence of focused melt channels. (C) 2018 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
WOS关键词ZANGBO SUTURE ZONE ; POZANTI-KARSANTI OPHIOLITE ; IZU-BONIN-MARIANA ; PODIFORM CHROMITITES ; OCEANIC LITHOSPHERE ; UPPER-MANTLE ; TRANSITION ZONE ; ORTHO-PYROXENE ; HIGH-AL ; HIGH-CR
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Science & Technology - Other Topics
语种英语
出版者ELSEVIER SCIENCE BV
WOS记录号WOS:000460872100007
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/132A11/90914]  
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
通讯作者Su, Benxun
作者单位1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
4.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China
5.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
6.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
7.Univ Trieste, Dept Math & Geosci, Via Weiss 8, I-34127 Trieste, Italy
8.Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA
推荐引用方式
GB/T 7714		 Su, Benxun,Zhou, Meifu,Jing, Jiejun,et al. Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine[J]. SCIENCE BULLETIN,2019,64(2):108-121.
APA Su, Benxun.,Zhou, Meifu.,Jing, Jiejun.,Robinson, Paul T..,Chen, Chen.,...&Hu, Yan.(2019).Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine.SCIENCE BULLETIN,64(2),108-121.
MLA Su, Benxun,et al."Distinctive melt activity and chromite mineralization in Luobusa and Purang ophiolites, southern Tibet: constraints from trace element compositions of chromite and olivine".SCIENCE BULLETIN 64.2(2019):108-121.

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来源：地质与地球物理研究所

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