Zinc Isotopes of the Mariana and Ryukyu Arc-Related Lavas Reveal Recycling of Forearc Serpentinites Into the Subarc Mantle
文献类型：期刊论文
| 作者 | Chen, Zuxing3,4,6; Chen, Jiubin1; Zeng, Zhigang3,4,5,6; Tamehe, Landry Soh2; Zhang, Ting1; Zhang, Yuxiang3,4,6; Yin, Xuebo3,4,6; Wang, Xiaoyuan3,4,6; Chen, Shuai3,4,6; Shuai, Wangcai1 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
 |
| 出版日期 | 2021-11-01 |
| 卷号 | 126期号:11页码:23 |
| ISSN号 | 2169-9313 |
| DOI | 10.1029/2021JB022261 |
| 通讯作者 | Chen, Zuxing(chenzuxing@qdio.ac.cn) ; Zeng, Zhigang(zgzeng@ms.qdio.ac.cn) |
| 英文摘要 | Mantle source heterogeneity of arc-related magmas was traditionally thought to be predominantly affected by slab-derived components. However, the role of forearc serpentinites in causing subarc mantle heterogeneity remains poorly constrained. Here, we present the first Zn isotope data for lavas from the Mariana and Ryukyu subduction zones. Notably, the delta Zn-66 values of basaltic lavas from the Mariana arc (0.16-0.18 parts per thousand) and southern Okinawa Trough (0.15-0.17 parts per thousand) are generally lower (similar to 0.10 parts per thousand) than those of the mid-ocean ridge basalts (MORB) (0.27 +/- 0.05 parts per thousand). Since mantle melting and magmatic differentiation respectively induce heavy Zn isotope enrichment in primary and evolved magmas, while melt extraction yields the limited Zn isotope fractionation in the mantle, lavas with low delta Zn-66 values thus potentially indicate the addition of subducted components. The negative correlation between the delta Zn-66 values and the Ba/La ratios of the basaltic lavas suggests the involvement of isotopically light fluids in their mantle sources. Forearc serpentinites are typically characterized by extremely light Zn isotope compositions. Such forearc materials were likely dragged downward to subarc depths and released isotopically light Zn in fluids to modify the overlying mantle wedge, thereby producing low delta Zn-66 values in arc-related magmas. Beyond subarc depths, forearc serpentinites are broken down completely, so light Zn isotope fluids are absent. Accordingly, the basalts from the middle Mariana and Okinawa Trough display MORB-like delta Zn-66 values. Collectively, Zn isotope provides new insights into the role of the recycling of forearc serpentinites in generating chemical heterogeneity in the mantle source of subduction-related magmas. Plain Language Summary Forearc serpentinites are hydrated by fluids released from the subducting slab, and they typically have negative delta Zn-66 values and strong enrichment in fluid-mobile elements. To understand this forearc material recycling in subduction zones, we analyzed the Zn isotope composition of lavas from the Mariana and Ryukyu subduction zones. To our knowledge, this is the first study to find that the arc-related lavas have lower delta Zn-66 values than those of the mid-ocean ridge basalts. Notable negative correlations between delta Zn-66 and proxies for fluid addition (e.g., Ba/La and Sr isotope ratios) provide critical evidence for the importance of recycled forearc serpentinites in generating mantle Zn isotopic heterogeneity in subduction zones. Most importantly, this study proves the efficiency of using Zn isotopes as a powerful tool to distinguish the contributions of slab and mantle wedge serpentinitederived fluids to arc magmas. |
| 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] ; Strategic Priority Research Program (B) of Chinese Academy of Sciences[XDB42020402] ; Shandong Provincial Natural Science Foundation, China[ZR2020QD069] ; Shandong Provincial Natural Science Foundation, China[ZR2020MD068] ; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2020KG11] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:000723102600011 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/177530]  |
| 专题 | 海洋研究所_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.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin, Peoples R China 2.Cent South Univ, Sch Geosci & Infophys, Changsha, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 5.Univ Chinese Acad Sci, Beijing, 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 | Chen, Zuxing,Chen, Jiubin,Zeng, Zhigang,et al. Zinc Isotopes of the Mariana and Ryukyu Arc-Related Lavas Reveal Recycling of Forearc Serpentinites Into the Subarc Mantle[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(11):23. |
| APA | Chen, Zuxing.,Chen, Jiubin.,Zeng, Zhigang.,Tamehe, Landry Soh.,Zhang, Ting.,...&Shuai, Wangcai.(2021).Zinc Isotopes of the Mariana and Ryukyu Arc-Related Lavas Reveal Recycling of Forearc Serpentinites Into the Subarc Mantle.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(11),23. |
| MLA | Chen, Zuxing,et al."Zinc Isotopes of the Mariana and Ryukyu Arc-Related Lavas Reveal Recycling of Forearc Serpentinites Into the Subarc Mantle".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.11(2021):23. |
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来源：海洋研究所
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