Knowledge Management System Of Guangzhou Institute of Geochemistry,CAS
Zhao, Jing1; Long, Xiaoping2; Li, Jie3; Zhao, Bingshuang2; Gao, Yilin2; Zuo, Rui2 | |
Serpentinite as a tracer for tectonic setting and mantle metasomatism of ophiolites: A case study of the Aoyougou ophiolite in the Qilian Orogenic Belt, NW China | |
刊名 | GONDWANA RESEARCH
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ISSN号 | 1342-937X |
2022-05-01 | |
卷号 | 105页码:1-11 |
DOI | 10.1016/j.gr.2021.12.006 |
语种 | 英语 |
WOS研究方向 | Geology |
摘要 | Serpentinites, particularly those transformed from mantle peridotites, are potential tracers for the petrogenesis and tectonic geodynamics of peridotitic protoliths and certain mantle processes (e.g., fluid/melt metasomatism). This study presents new petrographic observations, mineral chemistry, geochemistry, and Re-Os isotopic compositions of the serpentinites from the Aoyougou ophiolite, the most problematic ophiolite in the Qilian Orogenic Belt, NW China. Our data indicates that the protoliths are melting residues of oceanic lithospheric mantle in a forearc setting. The high Mg-# values (90.49-93.06) of serpentinites confirm their refractory nature, which reflects multiple episodes of partial melting and melt extraction (13.86-18.90%). Moreover, the geochemical fingerprints (e.g., U-shaped rare earth element chondrite-normalized patterns, enrichments of fluid-mobile elements, positive Eu anomalies, extremely high Re-187/Os-188 ratios, high Re abundances) and the "future" model ages (T-MA) of most of the serpentinites show that they had undergone intensive melt/fluid metasomatism. Metasomatism was probably triggered by the input of slab-derived melts/fluids in the forearc setting, which resulted in the introduction of a high abundance of Re. Moreover, the Re-Os isotopic ages record a two-stage evolutionary history of mantle residues that included Precambrian melt extraction and late-Cambrian Re input by mantle metasomatism. Combined with the geological context, an intra-oceanic subduction model was proposed to interpret the origin and evolution of the ophiolite. As a result of the intra-oceanic subduction of the North Qilian Ocean, the oceanic crust of the ophiolite was generated by decompressive melting of the previously depleted forearc mantle. (C) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
关键词 | Qilian Orogenic Belt Re-Os isotopes Serpentinite Mantle metasomatism Intra-oceanic subduction |
WOS记录号 | WOS:000752799600001 |
收录类别 | SCI |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gig.ac.cn/handle/344008/66410 |
通讯作者 | Long, Xiaoping |
作者单位 | 1.Chengdu Univ Technol, Coll Earth Sci, Dept Geochem, Chengdu 610059, Peoples R China 2.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China |
推荐引用方式 GB/T 7714 | Zhao, Jing,Long, Xiaoping,Li, Jie,et al. Serpentinite as a tracer for tectonic setting and mantle metasomatism of ophiolites: A case study of the Aoyougou ophiolite in the Qilian Orogenic Belt, NW China[J]. GONDWANA RESEARCH,2022,105:1-11. |
APA | Zhao, Jing,Long, Xiaoping,Li, Jie,Zhao, Bingshuang,Gao, Yilin,&Zuo, Rui.(2022).Serpentinite as a tracer for tectonic setting and mantle metasomatism of ophiolites: A case study of the Aoyougou ophiolite in the Qilian Orogenic Belt, NW China.GONDWANA RESEARCH,105,1-11. |
MLA | Zhao, Jing,et al."Serpentinite as a tracer for tectonic setting and mantle metasomatism of ophiolites: A case study of the Aoyougou ophiolite in the Qilian Orogenic Belt, NW China".GONDWANA RESEARCH 105(2022):1-11. |
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