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Geochemical and Sr-Nd-Pb isotopic compositions of volcanic rocks from the Iheya Ridge, the middle Okinawa Trough: implications for petrogenesis and a mantle source
Li, Xiaohui1,2; Zeng, Zhigang1,3; Chen, Shuai1; Ma, Yao1; Yang, Huixin1; Zhang, Yuxiang1,2; Chen, Zuxing1,2
2018
发表期刊ACTA OCEANOLOGICA SINICA
卷号37期号:1页码:73-88
文章类型Article
摘要As an active back-arc basin, the Okinawa Trough is located in the southeastern region of the East China Sea shelf and is strongly influenced by the subduction of the Philippine Sea Plate. Major element, trace element and Sr-Nd- Pb isotopic composition data are presented for volcanic rocks from the Iheya Ridge (IR), the middle Okinawa Trough. The IR rocks record large variations in major elements and range from basalts to rhyolites. Similar trace element distribution characteristics together with small variations in Sr-87/Sr-86 (0.703 862-0.704 884), Nd-144/Nd-143 (0.512 763-0.512 880) and Pb isotopic ratios, demonstrate that the IR rocks are derived from a similar magma source. The fractional crystallization of olivine, clinopyroxene, plagioclase, and amphibole, as well as accessory minerals, can reasonably explain the compositional variations of these IR rocks. The simulations suggest that approximately 60% and 75% fractionation of an evolved basaltic magma can produce trace element compositions similar to those of the intermediate rocks and acid rocks, respectively. The analysis of their Sr-Nd-Pb isotopic content ratios suggest that the source of the rocks from the IR is close to the depleted mantle (DM) but extends to the enriched mantle (EMII), indicating that the mantle source of these rocks is a mixture between the DM and EMII end members. The simulations show that the source of the IR volcanic rocks can be best interpreted as the result of the mixing of approximately 0.8%-2.0% subduction sediment components and 98.0%-99.2% mantlederived melts.
关键词Basic To Intermediate-acid Rocks Fractional Crystallization Subduction Sediment Components Iheya Ridge Okinawa Trough
DOI10.1007/s13131-017-1118-8
收录类别SCI
语种英语
WOS记录号WOS:000419193900008
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文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/154326
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
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Li, Xiaohui,Zeng, Zhigang,Chen, Shuai,et al. Geochemical and Sr-Nd-Pb isotopic compositions of volcanic rocks from the Iheya Ridge, the middle Okinawa Trough: implications for petrogenesis and a mantle source[J]. ACTA OCEANOLOGICA SINICA,2018,37(1):73-88.
APA Li, Xiaohui.,Zeng, Zhigang.,Chen, Shuai.,Ma, Yao.,Yang, Huixin.,...&Chen, Zuxing.(2018).Geochemical and Sr-Nd-Pb isotopic compositions of volcanic rocks from the Iheya Ridge, the middle Okinawa Trough: implications for petrogenesis and a mantle source.ACTA OCEANOLOGICA SINICA,37(1),73-88.
MLA Li, Xiaohui,et al."Geochemical and Sr-Nd-Pb isotopic compositions of volcanic rocks from the Iheya Ridge, the middle Okinawa Trough: implications for petrogenesis and a mantle source".ACTA OCEANOLOGICA SINICA 37.1(2018):73-88.
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