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    蚀变洋壳和俯冲带变质流体的Fe-Mg同位素组成

    黄建 黄方 肖益林

    黄建, 黄方, 肖益林, 2019. 蚀变洋壳和俯冲带变质流体的Fe-Mg同位素组成. 地球科学, 44(12): 4050-4056. doi: 10.3799/dqkx.2019.234
    引用本文: 黄建, 黄方, 肖益林, 2019. 蚀变洋壳和俯冲带变质流体的Fe-Mg同位素组成. 地球科学, 44(12): 4050-4056. doi: 10.3799/dqkx.2019.234
    Huang Jian, Huang Fang, Xiao Yilin, 2019. Fe-Mg Isotopic Compositions of Altered Oceanic Crust and Subduction-Zone Fluids. Earth Science, 44(12): 4050-4056. doi: 10.3799/dqkx.2019.234
    Citation: Huang Jian, Huang Fang, Xiao Yilin, 2019. Fe-Mg Isotopic Compositions of Altered Oceanic Crust and Subduction-Zone Fluids. Earth Science, 44(12): 4050-4056. doi: 10.3799/dqkx.2019.234

    蚀变洋壳和俯冲带变质流体的Fe-Mg同位素组成

    doi: 10.3799/dqkx.2019.234
    基金项目: 

    国家重点基础研究发展计划项目 2015CB856102

    国家自然科学基金项目 41573018

    详细信息
      作者简介:

      黄建(1984-), 男, 博士, 副研究员, 从事金属稳定同位素和地幔地球化学研究

    • 中图分类号: P581

    Fe-Mg Isotopic Compositions of Altered Oceanic Crust and Subduction-Zone Fluids

    • 摘要: 贫碳酸盐的蚀变洋壳具有与新鲜洋中脊玄武岩一致的Mg同位素组成,说明低温和高温洋壳蚀变不会导致Mg同位素分馏.大别山港河和花凉亭的早期变质脉比榴辉岩具有偏高的δ56Fe-δ26Mg值,而且早期到晚期变质脉的δ56Fe-δ26Mg值逐渐降低.这些结果说明,在流体-岩石反应和流体演化过程中,Fe-Mg同位素发生了显著的分馏,且矿物溶解-再沉淀是同位素分馏的控制因素.相比洋中脊玄武岩,蚀变洋壳和变质脉具有相似或偏高的δ56Fe-δ26Mg值,说明蚀变洋壳脱水产生的流体富集重Fe-Mg同位素,不能解释弧岩浆岩的轻Fe/重Mg同位素组成.因此,弧岩浆岩异常的Fe-Mg同位素组成是熔体提取和富集54Fe-26Mg的蛇纹岩流体交代地幔楔两个过程共同作用的结果.

       

    • 图  1  IODP 1256钻孔洋壳的蚀变温度(a),δ18O(b)和δ26Mg(c)的空间变化

      蚀变温度、O和Mg同位素数据引自Alt et al.(2010)Gao et al.(2012)Huang et al.(2015).灰色条带表示新鲜洋中脊玄武岩的O和Mg同位素组成(Harmon and Hoefs, 1995Teng et al., 2010)

      Fig.  1.  Down-hole variations in alteration temperatures, δ18O, and δ26Mg of oceanic crust from IODP site 1256

      图  2  大别山港河和花凉亭榴辉岩和变质脉的Fe3+/ΣFe、δ26Mg和δ56Fe变化

      Huang et al.(2019).灰色条带表示新鲜洋中脊玄武岩的Fe-Mg同位素组成(Weyer and Ionov, 2007Teng et al., 2010Nebel et al., 2013)

      Fig.  2.  Fe3+/ΣFe、δ26Mg, and δ56Fe in ecoligites and veins at Ganghe and Hualiangting in the Dabie orogen

      图  3  大别山港河和花凉亭超高压榴辉岩和变质脉中矿物的Fe-Mg同位素组成

      Huang et al.(2019).黑色正方形表示新鲜洋中脊玄武岩的Fe-Mg同位素组成(Weyer and Ionov, 2007Teng et al., 2010Nebel et al., 2013)

      Fig.  3.  δ26Mg and δ56Fe of minerals from ecoligites and veins at Ganghe and Hualiangting in the Dabie orogen

      图  4  大别山花凉亭三期变质脉全岩(a, b)和绿帘石(c, d)的Eu/Eu*δ26Mg和δ56Fe协变图解

      Huang et al.(2019)

      Fig.  4.  Eu/Eu*, δ26Mg, and δ56Fe in whole-rocks (a, b) and epidotes (c, d) of multi-stage veins at Hualiangting in the Dabie orogen

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    • 收稿日期:  2019-08-16
    • 刊出日期:  2019-12-15

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