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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

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Abstract

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 87Sr/86Sr (0.703 862–0.704 884), 144Nd/143Nd (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.

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Acknowledgments

The authors extend their heartfelt thanks to the Institute of Oceanology, Chinese Academy of Sciences for the supplied samples, Liu Hongyan for help with the analysis of major elements, and Yin Xuebo for help with the analysis of the trace elements of samples.

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  1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China

    Xiaohui Li, Zhigang Zeng, Shuai Chen, Yao Ma, Huixin Yang, Yuxiang Zhang & Zuxing Chen

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Xiaohui Li, Yuxiang Zhang & Zuxing Chen

  3. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China

    Zhigang Zeng

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Foundation item: The National Basic Research Program (973 Program) of China under contract No. 2013CB429700; the National Natural Science Foundation of China under contract Nos 41325021 and 41706052; the National Program on Global Change and Air- Sea Interaction under contract No. GASI-GEOGE-02; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11030302; the Special Fund for the Taishan Scholar Program of Shandong Province under contract No. ts201511061; the AoShan Talents Program supported by Qingdao National Laboratory for Marine Science and Technology under contract No. 2015ASTP-0S17; the Innovative Talent Promotion Program under contract No. 2012RA2191; the Science and Technology Development Program of Shandong Province under contract No. 2013GRC31502; the Scientific and Technological Innovation Project Financially supported by Qingdao National Laboratory for Marine Science and Technology under contract Nos 2015ASKJ03 and 2016ASKJ13; the National High Level Talent Special Support Program, the CAS/SAFEA International Partnership Program for Creative Research Teams, and Qingdao Collaborative Innovation Center of Marine Science and Technology.

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Li, X., Zeng, Z., Chen, S. 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 Oceanol. Sin. 37, 73–88 (2018). https://doi.org/10.1007/s13131-017-1118-8

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