板块俯冲过程中的Mg-Li-Fe-Cr同位素分馏

李东永; 肖益林; 王洋洋; 沈骥; 刘海洋

doi:10.3799/dqkx.2019.255

Volume 44 Issue 12

Dec. 2019

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Li Dongyong, Xiao Yilin, Wang Yangyang, Shen Ji, Liu Haiyang, 2019. Mg-Li-Fe-Cr Isotopic Fractionation during Subduction. Earth Science, 44(12): 4081-4085. doi: 10.3799/dqkx.2019.255

Citation:

Li Dongyong, Xiao Yilin, Wang Yangyang, Shen Ji, Liu Haiyang, 2019. Mg-Li-Fe-Cr Isotopic Fractionation during Subduction. Earth Science, 44(12): 4081-4085. doi: 10.3799/dqkx.2019.255

Li Dongyong, Xiao Yilin, Wang Yangyang, Shen Ji, Liu Haiyang, 2019. Mg-Li-Fe-Cr Isotopic Fractionation during Subduction. Earth Science, 44(12): 4081-4085. doi: 10.3799/dqkx.2019.255

Citation:

Li Dongyong, Xiao Yilin, Wang Yangyang, Shen Ji, Liu Haiyang, 2019. Mg-Li-Fe-Cr Isotopic Fractionation during Subduction. Earth Science, 44(12): 4081-4085. doi: 10.3799/dqkx.2019.255

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Mg-Li-Fe-Cr Isotopic Fractionation during Subduction

doi: 10.3799/dqkx.2019.255

CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2019-08-30
Publish Date: 2019-12-15

Abstract

Abstract

In order to investigate mantle heterogeneities induced by subducted crustal plate, many studies have been focused on geochemical characteristics of stable metal isotopic systematics in subduction zone in recent years. Limited Mg isotopic fractionation occurred during subduction and exhumation, thus lighter Mg isotopic composition of continental basalts might be caused by carbonatite metasomatism. Instead of inherited Li isotopes of amphibolite, eclogite has lighter Li isotopies, which are attributed to kinetic diffusion, dehydration, or rehydration. Isotopes of Fe and Cr have insignificant fractionation during formation of eclogite, however, Fe and Cr isotopic composition of serpentinite are related to oxidation index, suggesting dehydration or alteration of fluids during serpentinization could shift Fe and Cr isotopic composition of serpentinite.
- subduction zone,
- Mg-Li-Fe-Cr isotope,
- fractionation,
- geochemistry

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References(22)

References

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