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首页> 外文期刊>Journal of Asian earth sciences >The lithium isotopic composition and geochemical implication of ultrahigh-pressure marbles from the Dabie-Sulu orogen, China
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The lithium isotopic composition and geochemical implication of ultrahigh-pressure marbles from the Dabie-Sulu orogen, China

机译：来自Dabie-Sulu Orogen的锂同位素组成和地球化学含义来自Dabie-Sulu Orogen，China

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摘要

Subduction zones are important in materials' cycling between Earth's surface and mantle. We report lithium (Li) contents and isotopic compositions (delta Li-7) of ultrahigh-pressure (UHP) marbles of the Dabie-Sulu orogen, with the aim of elucidating the geochemical behavior of Li isotopes during deep subduction of surficial carbonates and exploring the application of Li isotopes in tracing subduction and material-cycling. Pure UHP marbles (with delta Li-7 values up to 21.5 parts per thousand) show significantly heavier isotopic compositions than those of the mantle (2.0 parts per thousand-5.7 parts per thousand; average 3.7 parts per thousand), while impure marbles containing some silicates have delta Li-7 values as low as 1.3 parts per thousand. Weathering, fluid infiltration, and isotopic fractionation have negligible effects on the Li isotopic compositions of UHP marbles. Exhumed UHP marbles might be good samples to study those residual carbonates entering into the deep mantle. When subducted carbonates transport heavy Li isotopic signatures to mantle depths, they may result in local Li isotopic heterogeneity. As Li is a trace element and UHP marbles have significantly different delta Li-7 signatures to the mantle, Li isotopic geochemistry might be useful in tracing deep carbon cycling.
机译：俯冲区域在地球表面和地幔之间的材料循环中很重要。我们报告锂（Li）含量和同位素组合物（Delta Li-7）的大虾苏尔orgen的超高压（UHP）大理石（Delta Li-7），目的是在深层俯卧面上进行表面碳酸盐和探索期间阐明李同位素的地球化学行为锂同位素在追踪俯冲和材料循环中的应用。纯净的UHP大理石（ΔLI-7值高达21.5份）显示出比地幔的同位素组成显着较高（每千份每千份千分之一千分之一;平均3.7份千分之一），而含有一些含有一些的大理石硅酸盐使Delta Li-7值低至1.3份每千份。风化，液体渗透和同位素分级对UHP大理石的锂同位素组成具有可忽略的影响。挖掘的UHP大理石可能是良好的样本，以研究进入深层地幔的那些残留的碳酸盐。当碳酸化碳酸盐转运重锂同位素差异到地幔深度时，它们可能导致局部锂同位素异质性。由于李是一种微量元素，并且UHP大理石对地幔具有显着不同的Delta Li-7签名，Li同位素地球化学可能可用于追踪深碳循环。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第15期|104376.1-104376.12|共12页
  • 作者

    Wan Hongqiong; Xiao Yilin; Sun He; Liu Haiyang; Wang Yangyang; Li Dongyong; Li Wang-ye;

  • 作者单位

    Univ Sci & Technol China CAS Key Lab Crust Mantle Mat & Environm Sch Earth & Space Sci Hefei 230026 Peoples R China;

    Univ Sci & Technol China CAS Key Lab Crust Mantle Mat & Environm Sch Earth & Space Sci Hefei 230026 Peoples R China|CAS Ctr Excellence Comparat Planetol Hefei Anhui Peoples R China;

    Univ Sci & Technol China CAS Key Lab Crust Mantle Mat & Environm Sch Earth & Space Sci Hefei 230026 Peoples R China|Hefei Univ Technol Sch Resources & Environm Engn Hefei 230009 Peoples R China;

    Univ Sci & Technol China CAS Key Lab Crust Mantle Mat & Environm Sch Earth & Space Sci Hefei 230026 Peoples R China|Chinese Acad Sci Ctr Deep Sea Res Inst Oceanol Qingdao 266071 Peoples R China;

    Univ Sci & Technol China CAS Key Lab Crust Mantle Mat & Environm Sch Earth & Space Sci Hefei 230026 Peoples R China;

    Univ Sci & Technol China CAS Key Lab Crust Mantle Mat & Environm Sch Earth & Space Sci Hefei 230026 Peoples R China;

    Univ Sci & Technol China CAS Key Lab Crust Mantle Mat & Environm Sch Earth & Space Sci Hefei 230026 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Lithium isotopes; Deep carbon cycling; UHP marble; Dabie-Sulu orogen; Subduction;

    机译：锂同位素;深碳循环;UHP大理石;大别苏尔orgen;俯冲;

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