IOCAS-IR  > 海洋地质与环境重点实验室
Halogen (F, Cl) Concentrations and Sr-Nd-Pb-B Isotopes of the Basaltic Andesites From the Southern Okinawa Trough: Implications for the Recycling of Subducted Serpentinites
Zhang, Yuxiang1,2,3,4; Gaetani, Glenn3; Zeng, Zhigang1,2,4,5; Monteleone, Brian3; Yin, Xuebo1,2,4; Wang, Xiaoyuan1,2,4; Chen, Shuai1,2,4
2021-03-01
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
卷号126期号:3页码:20
通讯作者Zhang, Yuxiang(zhangyuxiang13@mails.ucas.ac.cn) ; Zeng, Zhigang(zgzeng@ms.qdio.ac.cn)
摘要Serpentinites are increasingly recognized as playing an important role in the global geochemical cycle. However, discriminating the contributions of serpentinites to arc magmas from those of other subduction components is challenging. The Okinawa Trough is a back-arc basin developed behind the Ryukyu subduction zone, where magmas are extensively affected by sediment subduction. In this study, we reported the F-Cl concentrations and Sr-Nd-Pb-B isotopes of basaltic andesites from the Yaeyama Graben, Yonaguni Graben, and Irabu Knoll in the southern Okinawa Trough. The Irabu Knoll lavas show the most enrichment of fluid-mobile elements and F +/- Cl, and have the heaviest B isotopes (delta B-11: +6.6 +/- 1.5 parts per thousand). They also have decoupled Sr-Nd isotopes: higher Sr-87/Sr-86 (similar to 0.7049) but have no obvious decrease of Nd-143/Nd-144 (similar to 0.5128). Results from slab dehydration modeling and mixing calculations suggest that the heavy delta B-11 in the Irabu Knoll lavas is not consistent with fluids derived from altered oceanic crust (AOC), sediments, or wedge serpentinites (formed in the mantle wedge), but rather from slab serpentinites (formed within the subducting plate); sediments control the subduction input of Nd, whereas the decoupled Sr-Nd isotopes are most likely due to the excess radiogenic Sr carried by AOC fluids. Our results imply that recycling of serpentinite fluids and AOC fluids are usually coupled in subduction zones, as the arc lavas influenced by subducted serpentinite generally show Sr-Nd isotopes decoupling. The large variation of Sr-Nd-B isotopes observed in a relatively localized area is consistent with a focused migration through the mantle wedge of components from multiple sources.
关键词AOC boron isotope geochemical cycling serpentinite Sr‐ Nd isotope decoupling subduction zone
DOI10.1029/2021JB021709
收录类别SCI
语种英语
资助项目National Natural Science Foundation of China[91958213] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020402] ; China Postdoctoral Science Foundation[2019M662454] ; Shandong Provincial Natural Science Foundation, China[ZR2020QD068] ; Shandong Provincial Natural Science Foundation, China[ZR2020MD068] ; International Partnership Program of the Chinese Academy of Sciences[133137KYSB20170003] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; China Scholarship Council[201709410550]
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000638091600039
出版者AMER GEOPHYSICAL UNION
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被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/170508
专题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.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
2.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Mineral Resources, Qingdao, Peoples R China
3.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China
5.Univ Chinese Acad Sci, Beijing, 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
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Zhang, Yuxiang,Gaetani, Glenn,Zeng, Zhigang,et al. Halogen (F, Cl) Concentrations and Sr-Nd-Pb-B Isotopes of the Basaltic Andesites From the Southern Okinawa Trough: Implications for the Recycling of Subducted Serpentinites[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2021,126(3):20.
APA Zhang, Yuxiang.,Gaetani, Glenn.,Zeng, Zhigang.,Monteleone, Brian.,Yin, Xuebo.,...&Chen, Shuai.(2021).Halogen (F, Cl) Concentrations and Sr-Nd-Pb-B Isotopes of the Basaltic Andesites From the Southern Okinawa Trough: Implications for the Recycling of Subducted Serpentinites.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,126(3),20.
MLA Zhang, Yuxiang,et al."Halogen (F, Cl) Concentrations and Sr-Nd-Pb-B Isotopes of the Basaltic Andesites From the Southern Okinawa Trough: Implications for the Recycling of Subducted Serpentinites".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 126.3(2021):20.
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