Identifying Recycled Materials Using Mo Isotopes in Intraplate Alkali Basalts From the Southeastern Margin of Tibetan Plateau
文献类型：期刊论文
| 作者 | Xu, Dongjing1,4; Qi, Yue1; Wang, Qiang1,4; Li, Jie1 ; Wyman, Derek A.3; Kerr, Andrew C.2; Zhang, Xiuzheng1; Guo, Peina1,4
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| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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| 出版日期 | 2024-10-01 |
| 卷号 | 25期号:10页码:19 |
| DOI | 10.1029/2024GC011750 |
| 英文摘要 | Mantle heterogeneity in lithology and geochemistry is often attributed to recycled subducted materials. While distinct mantle end-members are identified by radiogenic isotopes, the specific recycled materials contributing to this heterogeneity remain debated. This study presents Mo-Sr-Nd-Pb isotopic data for OIB-like alkali basalts from the Maguan area in the southeastern Tibetan Plateau, focusing on slab inputs' role in mantle heterogeneity. The Miocene (ca. 13 Ma) Maguan alkali basalts are divided into two types based on petrographic and geochemical characteristics, showing similar Sr-Nd-Pb isotopic signatures but different Mo isotopic compositions. Type I basalts exhibit a wide delta 98/95Mo range (-0.31 parts per thousand to -1.03 parts per thousand, average -0.47 parts per thousand +/- 0.06 parts per thousand, 2SD = 0.40 parts per thousand, n = 13), while type II basalts have heavy and constant delta 98/95Mo values (-0.11 parts per thousand to -0.17 parts per thousand, average -0.14 parts per thousand +/- 0.01 parts per thousand, 2SD = 0.05 parts per thousand, n = 6). The unique low delta 98/95Mo value (-1.03 parts per thousand) in type I basalts is among the lowest reported in OIB-like continental basalts. Type I basalts likely originate from an enriched asthenospheric mantle metasomatized by melts from recycled dehydrated oceanic crust and sediments, whereas type II basalts are derived from partial melting of an enriched asthenospheric mantle metasomatized by melts from recycled serpentinized peridotites. The residual Tethys oceanic slabs in the deep mantle significantly contribute to the mantle source of the Maguan basalts. The formation of Maguan Miocene magmas may be linked to mantle upwelling induced by the subduction of the West Burma plate. This study highlights the Mo isotopic system's utility in tracing complex slab fluxes generating mantle geochemical heterogeneity. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001368182200001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/81992]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 通讯作者 | Qi, Yue; Wang, Qiang |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 2.Cardiff Univ, Sch Earth & Environm Sci, Cardiff, Wales 3.Univ Sydney, Sch Geosci, Sydney, NSW, Australia 4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Dongjing,Qi, Yue,Wang, Qiang,et al. Identifying Recycled Materials Using Mo Isotopes in Intraplate Alkali Basalts From the Southeastern Margin of Tibetan Plateau[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2024,25(10):19. |
| APA | Xu, Dongjing.,Qi, Yue.,Wang, Qiang.,Li, Jie.,Wyman, Derek A..,...&Guo, Peina.(2024).Identifying Recycled Materials Using Mo Isotopes in Intraplate Alkali Basalts From the Southeastern Margin of Tibetan Plateau.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,25(10),19. |
| MLA | Xu, Dongjing,et al."Identifying Recycled Materials Using Mo Isotopes in Intraplate Alkali Basalts From the Southeastern Margin of Tibetan Plateau".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 25.10(2024):19. |
入库方式： OAI收割
来源：广州地球化学研究所
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