蛇绿岩中铬铁岩母岩浆的富Ca特征:矿物包裹体证据

刘霞; 苏本勋; 白洋; 陈晨; 肖燕; 梁子; 杨赛红; 彭青山; 苏本灿; 刘斌

doi:10.3799/dqkx.2018.707

Volume 43 Issue 4

Apr. 2018

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Article Navigation > Earth Science > 2018 > 43(4): 1038-1050

Liu Xia, Su Benxun, Bai Yang, Chen Chen, Xiao Yan, Liang Zi, Yang Saihong, Peng Qingshan, Su Bencan, Liu Bin, 2018. Ca-Enrichment Characteristics of Parental Magmas of Chromitite in Ophiolite: Inference from Mineral Inclusions. Earth Science, 43(4): 1038-1050. doi: 10.3799/dqkx.2018.707

Citation:

Liu Xia, Su Benxun, Bai Yang, Chen Chen, Xiao Yan, Liang Zi, Yang Saihong, Peng Qingshan, Su Bencan, Liu Bin, 2018. Ca-Enrichment Characteristics of Parental Magmas of Chromitite in Ophiolite: Inference from Mineral Inclusions. Earth Science, 43(4): 1038-1050. doi: 10.3799/dqkx.2018.707

Citation:

Liu Xia, Su Benxun, Bai Yang, Chen Chen, Xiao Yan, Liang Zi, Yang Saihong, Peng Qingshan, Su Bencan, Liu Bin, 2018. Ca-Enrichment Characteristics of Parental Magmas of Chromitite in Ophiolite: Inference from Mineral Inclusions. Earth Science, 43(4): 1038-1050. doi: 10.3799/dqkx.2018.707

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Ca-Enrichment Characteristics of Parental Magmas of Chromitite in Ophiolite: Inference from Mineral Inclusions

doi: 10.3799/dqkx.2018.707

Liu Xia^{1,2
,},
Su Benxun^{2,3
,
,},
Bai Yang^2,3,
Chen Chen^2,3,
Xiao Yan⁴,
Liang Zi^3,4,
Yang Saihong⁴,
Peng Qingshan⁵,
Su Bencan⁶,
Liu Bin⁶

1.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
2.
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China
4.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
5.
Faculty of Prospecting and Survey Engineering, Changchun Institute of Technology, Changchun 130012, China
6.
Eighth Oil Production Plant, Changqing Oilfield Company, PetroChina Co. Ltd., Xi'an 710000, China

Received Date: 2017-12-18
Publish Date: 2018-04-15

Abstract

Abstract

The origin and mechanisms involved in the formation of chromitite deposit in ophiolites remain a controversial subject of continuous debate. One of the important ways to address this issue is to investigate the nature and composition of parental magmas of chromitite, which may be revealed by mineral inclusions in chromite interpreted to have crystallized contemporaneously with or earlier than the host chromite. Various types of inclusions have been found in chromite ores with different textures in the Pozantı-Karsantı ophiolite in Turkey, which include (1) anhydrous silicate type such as olivine and clinopyroxene, (2) hydrous silicate type such as amphibole and phlogopite, (3) composite type such as the association of serpentine, wollastonite and clinopyroxene, (4) and uncommon mineral type such as apatite and platinum group element sulfide. The occurrence of hydrous mineral and the high Mg^# of some minerals (e.g., olivine Mg^#=95.4-97.1, clinopyroxene Mg^#=92.0-99.0, amphibole Mg^#=88.9-99.8) suggest that parental magmas of the chromite are rich in Mg and water contents. Besides the inclusions of apatite and uvarovite, it is reported, for the first time, that calcite and wollastonite inclusions in chromite, which, together with high-CaO features in silicate minerals, indicate Ca-enrichment. The elevated Ca contents in melts are favorable in stabilizing Cr³⁺ in silicate melt, while crystallization of Ca-bearing minerals could result in Cr enrichment in the melts. The Ca-rich component was probably derived from Ca-enriched rocks in subducting slab.
- ophiolite,
- chromite,
- inclusion,
- parental magma,
- mineralogy,
- petrology

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References(64)

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