| Heavy Copper Isotopes in Arc-Related Lavas From Cold Subduction Zones Uncover a Sub-Arc Mantle Metasomatized by Serpentinite-Derived Sulfate-Rich Fluids | |
| Chen, Zuxing1,2,3; Chen, Jiubin4; Tamehe, Landry Soh5; Zhang, Yuxiang1,2,3; Zeng, Zhigang1,2,3,6; Xia, Xiaoping7; Cui, Zexian7; Zhang, Ting4; Guo, Kun8 | |
| 2022-10-01 | |
| 发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| ISSN | 2169-9313 |
| 卷号 | 127期号:10页码:19 |
| 通讯作者 | Chen, Zuxing([email protected]) ; Zeng, Zhigang([email protected]) |
| 摘要 | Serpentinite dehydration during subduction releases fluids into the sub-arc mantle, yet the oxidizing capability of these fluids remains controversial. Here, redox-sensitive Cu isotopes and in situ S isotopes of magmatic sulfides in fresh lavas from three subduction zones in the western Pacific were analyzed to determine the speciation of multi-valence elements in the serpentinite-derived fluids. Notably, the basaltic lavas from the Mariana Arc, eastern Manus Basin, and southern Okinawa Trough have isotopically heavy Cu (delta Cu-65 = +0.26 to +0.67 parts per thousand) compared to the mantle-like delta Cu-65 values of the middle Okinawa Trough and Mariana Trough basalts (+0.11 to +0.14 parts per thousand). In addition, positive correlations between delta Cu-65 and slab fluid indicators (e.g., B/Nb, Ba/Th, and Ba/La) combined with positive delta S-34 values (similar to+4 parts per thousand) of magmatic sulfides in the Mariana Arc lavas, suggest that fluids with isotopically heavy Cu and S metasomatized their mantle sources. Theoretically, the Cu2+-SO42- ${\mathrm{C}\mathrm{u}}<^>{2+}-{\mathrm{S}\mathrm{O}}_{4}<^>{2\mbox{--}}$ bearing fluids released by serpentinite dehydration have extremely heavy Cu and S isotope compositions. Consequently, the sulfate-rich fluids infiltration into the sub-arc mantle produces heavy Cu and S isotopes in arc-related magmas. Comparatively, sulfate-rich fluids are absent at back-arc depths due to the complete breakdown of serpentine minerals during the early stages of subduction, which results in the mid-ocean ridge basalts-like delta Cu-65 and delta S-34 values (similar to-1 parts per thousand) observed in the middle Okinawa Trough and Mariana Trough basalts. Therefore, heavy Cu isotopes in arc-related magmas uncover that the sub-arc mantle was metasomatized by serpentinite-derived sulfate-rich (oxidizing) fluids, which accounts for the oxidized nature of arc magmas in cold subduction zones. |
| DOI | 10.1029/2022JB024910 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[91958213]; National Natural Science Foundation of China[42106083]; National Natural Science Foundation of China[41625012]; National Natural Science Foundation of China[41961144028]; Chinese Academy of Sciences[XDB42020402]; Shandong Provincial Natural Science Foundation, China[ZR2020QD069]; Shandong Provincial Natural Science Foundation, China[ZR2020MD068]; Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2020KG11]; National Key Basic Research Program of China[2013CB429700] |
| WOS研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000871716100001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/180561 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Chen, Zuxing; Zeng, Zhigang |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 4.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin, Peoples R China 5.Cent South Univ, Sch Geosci & Infophys, Changsha, Peoples R China 6.Univ Chinese Acad Sci, Beijing, Peoples R China 7.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Peoples R China 8.Qingdao Natl Lab Marine Sci & Technol, Ctr Isotope Geochem & Geochronol, Qingdao, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 通讯作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 推荐引用方式 GB/T 7714 | Chen, Zuxing,Chen, Jiubin,Tamehe, Landry Soh,et al. Heavy Copper Isotopes in Arc-Related Lavas From Cold Subduction Zones Uncover a Sub-Arc Mantle Metasomatized by Serpentinite-Derived Sulfate-Rich Fluids[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(10):19. |
| APA | Chen, Zuxing.,Chen, Jiubin.,Tamehe, Landry Soh.,Zhang, Yuxiang.,Zeng, Zhigang.,...&Guo, Kun.(2022).Heavy Copper Isotopes in Arc-Related Lavas From Cold Subduction Zones Uncover a Sub-Arc Mantle Metasomatized by Serpentinite-Derived Sulfate-Rich Fluids.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(10),19. |
| MLA | Chen, Zuxing,et al."Heavy Copper Isotopes in Arc-Related Lavas From Cold Subduction Zones Uncover a Sub-Arc Mantle Metasomatized by Serpentinite-Derived Sulfate-Rich Fluids".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.10(2022):19. |
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| Heavy Copper Isotope（3638KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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