Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba-Sr-Nd Isotopes
文献类型：期刊论文
| 作者 | Zhang, Yuxiang4,5,6 ; Shu, Yunchao3; Turner, Simon2; Chen, Zuxing4,5,6; Zeng, Zhigang4,5,6; Huang, Fang1
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| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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| 出版日期 | 2024-03-01 |
| 卷号 | 129期号:3页码:13 |
| 关键词 | altered oceanic crust Ba isotope Sr-Nd isotope decoupling arc magma subduction recycling |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2023JB028407 |
| 通讯作者 | Zhang, Yuxiang(zhangyuxiang13@mails.ucas.ac.cn) ; Zeng, Zhigang(zgzeng@qdio.ac.cn) |
| 英文摘要 | Altered oceanic crust (AOC) plays a critical role in geochemical recycling in subduction zones. However, identifying contributions of subducted AOC to arc magmas remains a conundrum due to the lack of effective tracers. Here, we investigate the Ba-Sr-Nd isotopic compositions of lavas from the Mariana arc and back-arc. Based on a statistical analysis of the Sr-Nd isotopes for global arc volcanoes, we confirm that AOC-derived fluid (or hydrous melt), rather than sediment-derived melt or fluid, is responsible for the Sr-Nd isotope decoupling (i.e., 87Sr/86Sr is "excessively" enriched relative to 143Nd/144Nd when compared to the "normal" mantle derivates) observed in island arc lavas. We show that the arc lavas with increasingly decoupled Sr-Nd isotopes generally have heavier Ba isotope ratios, which is also a characteristic feature of AOC-derived fluids. Thus, these results establish an intimate link between subducted AOC, heavy Ba isotope compositions, and Sr-Nd isotope decoupling signature in island arcs, which provides a powerful tool to trace the AOC recycling in subduction zones. Furthermore, a similar correlation is observed between Sr-Nd isotope decoupling and heavy B isotope ratios for global arc lavas, implying that the recycling of AOC component is generally linked to serpentinite dehydration in subduction zones. Altered oceanic crust (AOC) is an important subduction component that contributes to the generation of arc magmas. However, identifying this contribution to arc magmas is challenging for the lack of effective tracers. Nonetheless, AOC has two characteristic features: (a) Sr-Nd isotope decoupling (i.e., enriched in 87Sr/86Sr relative to 143Nd/144Nd in contrast to the "normal" mantle array); and (b) relatively heavy Ba isotope compositions. Here, we analyze the Ba-Sr-Nd isotopic compositions of lavas from the Mariana arc and back-arc, which are combined with a statistical analysis of the Sr-Nd isotopes for global arc volcanoes. Our results confirm that fluid (or hydrous melt) derived from subducted AOC, rather than sediment, is responsible for the Sr-Nd isotope decoupling observed in island arc lavas. Strikingly, the magnitude of the Sr-Nd isotope decoupling correlates well with the Ba isotope compositions of the arc lavas. Thus, our results establish an intimate link between subducted AOC, heavy Ba isotope ratios, and Sr-Nd isotope decoupling signature in island arcs. This combination of Ba-Sr-Nd isotopes can therefore now be used as a powerful tracer to identify the contributions of subducted AOC to arc magmas. Our results also suggest that AOC and serpentinite show synergistic behavior during subduction recycling. Global arc data confirm that the Sr-Nd isotope decoupling of arc lavas is caused by AOC-derived fluid Decoupled Sr-Nd isotopes plus heavy Ba isotope is a good tracer for recycled altered oceanic crust (AOC) in arc magmas AOC and serpentinite show synergistic behaviors during subduction recycling |
| WOS关键词 | NORTHERN MARIANA-ISLANDS ; SUBDUCTION ZONES ; SLAB DEHYDRATION ; VOLCANIC-ROCKS ; SYSTEMATICS ; WATER ; GEOCHEMISTRY ; SERPENTINE ; FLUIDS ; PB |
| 资助项目 | National Natural Science Foundation of China ; Chinese Academy of Sciences[XDB42020402] ; National Key Research and Development Program of China[2023YFF0804304] ; National Key Research and Development Program of China[2023YFF0804301] ; [42206058] ; [91958213] ; [42221005] ; [42330409] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001177992100001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/184980]  |
| 专题 | 海洋研究所_海洋地质与环境重点实验室 |
| 通讯作者 | Zhang, Yuxiang; Zeng, Zhigang |
| 作者单位 | 1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei, Peoples R China 2.Macquarie Univ, Dept Earth & Environm Sci, Sydney, NSW, Australia 3.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 5.Laoshan Lab, Lab Marine Mineral Resources, Qingdao, Peoples R China 6.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Yuxiang,Shu, Yunchao,Turner, Simon,et al. Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba-Sr-Nd Isotopes[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2024,129(3):13. |
| APA | Zhang, Yuxiang,Shu, Yunchao,Turner, Simon,Chen, Zuxing,Zeng, Zhigang,&Huang, Fang.(2024).Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba-Sr-Nd Isotopes.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,129(3),13. |
| MLA | Zhang, Yuxiang,et al."Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba-Sr-Nd Isotopes".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 129.3(2024):13. |
入库方式： OAI收割
来源：海洋研究所
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