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Serpentinite-derived low δ7Li fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps
Ye Tian; Yilin Xiao; Yi-Xiang Chen; He Sun; Haiyang Liu; Fengtai Tong; Jie-Hua Yang; Hans-Peter Schertl
2019
Source PublicationLithos
Volume348-349Pages:1-9
Abstract

Whole rock lithium (Li) and Li isotopic compositions of coesite-bearing whiteschists and their country rock metagranites from the Dora-Maira Massif in theWestern Alps were investigated to understand their behavior during fluid-rock interaction in mantle depths of continental subduction zones. The whiteschists reveal relatively low d7 Li values (6.4‰ to þ2.4‰, with an average value of 2.1‰) in comparison to the country rock metagranites (d7 Li ¼ 1.2‰ to þ3.6‰, with an average value of þ1.4‰). The d7 Li values of whiteschists do not show any correlations withmajor elements (e.g. Mg, Fe), Li, or isotopes (i.e., d26Mg and d18O values) and cannot be explained by kinetic fractionation. Hence, the low d7 Li values of whiteschists result from interactions with metasomatic fluids containing isotopically light Li that occurred in deep portions of a continental subduction zone. Fluid-rock interaction modeling suggests that the metasomatic fluids contain low d7 Li values (down to 4‰) and moderate Li concentrations (50 to 150 ppm), which were probably derived from the dehydration of serpentinites in the subduction channel. The presence of such low d7 Li fluids in deep subduction zones could cause Li isotopic heterogeneity in the earth's interior.

KeywordLithium Isotopes metasomatism whiteschist serpentinite western Alps
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10578
Collection矿床地球化学国家重点实验室
Affiliation1.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
2.CAS Center for Excellence in Comparative Planetology, China
3.School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
4.Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
5.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, CAS, Guiyang 550081, China
6.Ruhr University Bochum, Faculty of Geosciences, Institute of Geology, Mineralogy and Geophysics, 44780 Bochum, Germany
7.College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China
Recommended Citation
GB/T 7714
Ye Tian,Yilin Xiao,Yi-Xiang Chen,et al. Serpentinite-derived low δ7Li fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps[J]. Lithos,2019,348-349:1-9.
APA Ye Tian.,Yilin Xiao.,Yi-Xiang Chen.,He Sun.,Haiyang Liu.,...&Hans-Peter Schertl.(2019).Serpentinite-derived low δ7Li fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps.Lithos,348-349,1-9.
MLA Ye Tian,et al."Serpentinite-derived low δ7Li fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps".Lithos 348-349(2019):1-9.
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