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Geochemical and Mineralogical Investigation on Different Types of Cenozoic Basalts in the Sanshui Basin: Implications for Magma Mixing Processes

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Abstract

Two kinds of basalts with different chemical compositions were obtained in the Sanshui Basin, they share the same eruption period. Although they have significant differences in major and trace element concentrations, their isotopic ratios suggest a similar magma source. Based on mineral geochemical analysis, orthopyroxene with reaction rim and zoned clinopyroxene are observed in Zidong (ZD) basalts, but not found in Wangjiegang (WJG) basalts. Linear scanning of these minerals suggests compositional variation between within-plate tholeiite and within-plate alkali-basalt. Presence of a double-layer magma chamber under the Sanshui Basin, and occurrence of magma mixing between upper and lower chambers is proposed. This magma mixing leads to different chemical composition and mineral constitution of two kinds of basalts, as well as reaction rim and compositional variation of minerals in ZD basalts.

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Acknowledgments

We thank Prof. Qi Li, Drs. Shu-Ying Yang, Ye Jin, and Jun-Jie Hu for helping us to collect samples. We also appreciate many suggestions from anonymous reviewers. This study was financial supported by the National Natural Science Foundation of China (Nos. 41276047, 41030853, 41572207, 41440041) and the Special and Frontier Foundation for the Twelve Five Plan of the China Ocean Mineral Resources Research and Development Association (No. DY125-22-QY-21). The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1208-y.

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Authors and Affiliations

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

    Wei Zhang

  2. School of Ocean Sciences, China University of Geosciences, Beijing, 100083, China

    Nianqiao Fang & Xiaobo Yuan

  3. College of Earth Sciences, East China Institute of Technology, Nanchang, 330013, China

    Lukai Cui

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  1. Wei Zhang
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  2. Nianqiao Fang
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Correspondence to Wei Zhang.

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Zhang, W., Fang, N., Yuan, X. et al. Geochemical and Mineralogical Investigation on Different Types of Cenozoic Basalts in the Sanshui Basin: Implications for Magma Mixing Processes. J. Earth Sci. 30, 754–762 (2019). https://doi.org/10.1007/s12583-019-1208-y

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