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| Serpentinite-derived low delta Li-7 fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps | |
| Tian, Ye1; Xiao, Yilin1,2; Chen, Yi-Xiang1,2; Sun, He1,3; Liu, Haiyang1,4; Tong, Fengtai1; Yang, Jie-Hua5; Schertl, Hans-Peter6,7 | |
| 2019-12-01 | |
| Source Publication | LITHOS
 |
| ISSN | 0024-4937 |
| Volume | 348Pages:9 |
| Corresponding Author | Xiao, Yilin(ylxiao@ustc.edu.cn) ; Chen, Yi-Xiang(yxchen07@ustc.edu.cn) |
| Abstract | Whole rock lithium (Li) and Li isotopic compositions of coesite-bearing whiteschists and their country rock metagranites from the Dora-Maira Massif in the Western Alps were investigated to understand their behavior during fluid-rock interaction in mantle depths of continental subduction zones. The whiteschists reveal relatively low delta Li-7 values (-6.4 parts per thousand to +2.4 parts per thousand, with an average value of -2.1 parts per thousand) in comparison to the country rock metagranites (delta Li-7 = -1.2 parts per thousand to +3.6 parts per thousand, with an average value of +1.4 parts per thousand). The delta Li-7 values of whiteschists do not show any correlations with major elements (e.g. Mg, Fe), Li, or isotopes (i.e., delta Mg-26 and delta O-18 values) and cannot be explained by kinetic fractionation. Hence, the low delta Li-7 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 delta Li-7 values (down to -4 parts per thousand) 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 delta Li-7 fluids in deep subduction zones could cause Li isotopic heterogeneity in the earth's interior. (C) 2019 Elsevier B.V. All rights reserved. |
| Keyword | Lithium isotopes Metasomatism Whiteschist Serpentinite Western Alps |
| DOI | 10.1016/j.lithos.2019.105177 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Strategic Priority Research Program (B) of CAS[XDB18020000] ; Natural Science Foundation of China[41673031] ; Natural Science Foundation of China[41622302] ; Natural Science Foundation of China[41773021] ; Natural Science Foundation of China[41473033] ; Youth Innovation Promotion Association of CAS[2014300] ; State Key Laboratory of Ore Deposit Geochemistry open funds[201608] ; Fundamental Research Funds for the Central Universities |
| WOS Research Area | Geochemistry & Geophysics ; Mineralogy |
| WOS Subject | Geochemistry & Geophysics ; Mineralogy |
| WOS ID | WOS:000500375700004 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/163745 |
| Collection | 深海极端环境与生命过程研究中心 |
| Corresponding Author | Xiao, Yilin; Chen, Yi-Xiang |
| Affiliation | 1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 2.CAS Ctr Excellence Comparat Planetol, Hefei, Anhui, Peoples R China 3.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Anhui, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Shandong, Peoples R China 5.Chinese Acad Sci, State Key Lab Ore Deposit Geochem, Inst Geochem, Guiyang 550081, Guizhou, Peoples R China 6.Ruhr Univ Bochum, Inst Geol Mineral & Geophys, Fac Geosci, D-44780 Bochum, Germany 7.Shandong Univ Sci & Technol, Coll Earth Sci & Engn, Qingdao 266590, Shandong, Peoples R China |
| Recommended Citation GB/T 7714 | Tian, Ye,Xiao, Yilin,Chen, Yi-Xiang,et al. Serpentinite-derived low delta Li-7 fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps[J]. LITHOS,2019,348:9. |
| APA | Tian, Ye.,Xiao, Yilin.,Chen, Yi-Xiang.,Sun, He.,Liu, Haiyang.,...&Schertl, Hans-Peter.(2019).Serpentinite-derived low delta Li-7 fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps.LITHOS,348,9. |
| MLA | Tian, Ye,et al."Serpentinite-derived low delta Li-7 fluids in continental subduction zones: Constraints from the fluid metasomatic rocks (whiteschist) from the Dora-Maira Massif, Western Alps".LITHOS 348(2019):9. |
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