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 Xiaohui; ZENG Zhigang; CHEN Shuai; MA Yao; YANG Huixin; ZHANG Yuxiang

doi:10.1007/s13131-017-1118-8

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Article Navigation > Acta Oceanologica Sinica > 2018 > 37(1): 73-88

LI Xiaohui, ZENG Zhigang, CHEN Shuai, MA Yao, YANG Huixin, ZHANG Yuxiang. 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. doi: 10.1007/s13131-017-1118-8

Citation:

LI Xiaohui, ZENG Zhigang, CHEN Shuai, MA Yao, YANG Huixin, ZHANG Yuxiang. 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. doi: 10.1007/s13131-017-1118-8

Citation:

LI Xiaohui, ZENG Zhigang, CHEN Shuai, MA Yao, YANG Huixin, ZHANG Yuxiang. 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. doi: 10.1007/s13131-017-1118-8

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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

doi: 10.1007/s13131-017-1118-8

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
3.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2017-06-19

Abstract

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% mantle-derived melts.
- basic to intermediate-acid rocks,
- fractional crystallization,
- subduction sediment components,
- Iheya Ridge,
- Okinawa Trough

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References(94)

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