Fe-Mg同位素在蛇绿岩中铬铁矿床成因研究中的应用潜力

苏本勋; 肖燕; 陈晨; 白洋; 刘霞; 梁子; 彭青山

doi:10.3799/dqkx.2018.705

Volume 43 Issue 4

Apr. 2018

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Article Navigation > Earth Science > 2018 > 43(4): 1011-1024

Su Benxun, Xiao Yan, Chen Chen, Bai Yang, Liu Xia, Liang Zi, Peng Qingshan, 2018. Potential Applications of Fe and Mg Isotopes in Genesis of Chromite Deposits in Ophiolites. Earth Science, 43(4): 1011-1024. doi: 10.3799/dqkx.2018.705

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Su Benxun, Xiao Yan, Chen Chen, Bai Yang, Liu Xia, Liang Zi, Peng Qingshan, 2018. Potential Applications of Fe and Mg Isotopes in Genesis of Chromite Deposits in Ophiolites. Earth Science, 43(4): 1011-1024. doi: 10.3799/dqkx.2018.705

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Potential Applications of Fe and Mg Isotopes in Genesis of Chromite Deposits in Ophiolites

doi: 10.3799/dqkx.2018.705

Su Benxun^{1,2,3
,},
Xiao Yan^2,4,
Chen Chen^1,2,3,
Bai Yang^1,2,3,
Liu Xia^1,5,
Liang Zi^2,3,4,
Peng Qingshan⁶

1.
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
Institutions of Earth Science, 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.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China
6.
Faculty of Prospecting and Survey Engineering, Changchun Institute of Technology, Changchun 130012, China

Received Date: 2017-12-20
Publish Date: 2018-04-15

Abstract

Abstract

Genesis of chromittie deposit in ophiolites has been debated for a long time. It is commonly related to host ophiolite, chromite occurrence, simple mineral assemblage and simple mineral chemistry, and unusual and complicated mineral inclusions. To constrain the genesis of chromite, a study on Fe and Mg isotopes of mantle peridotite and chromitite from Purang and Luobusa ophiolites in Tibet and Kızıldaǧ and Kop ophiolites in Turkey is conducted. The results reveal that (1) mantle peridotite of ophiolites has uniform Fe and Mg isotope compositions, falling in the same range of worldwide peridotite; (2) chromite and olivine in chromitite show large Fe and Mg isotope fractionations with overall lower δ⁵⁶Fe and higher δ²⁶Mg in chromite than olivine; (3) Fe and Mg isotope fractionations between chromite and olivine are mainly controlled by fractional crystallization and subsolidus Fe and Mg exchanges in two opposite processes. Therefore, Fe and Mg isotopes have great potentials to trace origin and nature of parental magmas of chromitite and crystallization and precipitation of chromite.
- ophiolite,
- chromite,
- Fe isotope,
- Mg isotope,
- petrology,
- mineralogy

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References(109)

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