洋壳蚀变过程中锂同位素行为研究进展

刘红玲, 田丽艳, 吴涛, 陈凌轩, 沈晨曦. 洋壳蚀变过程中锂同位素行为研究进展[J]. 海洋地质与第四纪地质, 2023, 43(3): 93-106. doi: 10.16562/j.cnki.0256-1492.2022112001
引用本文: 刘红玲, 田丽艳, 吴涛, 陈凌轩, 沈晨曦. 洋壳蚀变过程中锂同位素行为研究进展[J]. 海洋地质与第四纪地质, 2023, 43(3): 93-106. doi: 10.16562/j.cnki.0256-1492.2022112001
LIU Hongling, TIAN Liyan, WU Tao, CHEN Lingxuan, SHEN Chenxi. Behavior of Li isotopes during the alteration of oceanic crust: A review[J]. Marine Geology & Quaternary Geology, 2023, 43(3): 93-106. doi: 10.16562/j.cnki.0256-1492.2022112001
Citation: LIU Hongling, TIAN Liyan, WU Tao, CHEN Lingxuan, SHEN Chenxi. Behavior of Li isotopes during the alteration of oceanic crust: A review[J]. Marine Geology & Quaternary Geology, 2023, 43(3): 93-106. doi: 10.16562/j.cnki.0256-1492.2022112001

洋壳蚀变过程中锂同位素行为研究进展

  • 基金项目: 国家自然科学基金“南海初始洋壳(IODP1502B 钻孔)的 Li-Mg-O 同位素组成:对洋壳蚀变过程中同位素组成和分馏行为的初步研究”(41876044)
详细信息
    作者简介: 刘红玲(1996—),女,硕士研究生,主要从事海底岩石学及地球化学研究,E-mail:liuhl@idsse.ac.cn
    通讯作者: 田丽艳(1979—),女,博士,研究员,主要从事海底岩石学及地球化学研究,E-mail:lytian@idsse.ac.cn
  • 中图分类号: P734.4

Behavior of Li isotopes during the alteration of oceanic crust: A review

More Information
  • 洋壳自洋中脊形成到俯冲进入地幔之前,与流体(如海水和热液流体)在海底表面及洋壳内部可以发生广泛的水-岩相互作用,通过对洋壳蚀变过程中元素迁移和同位素分馏行为的研究,可以帮助我们认识海底热液循环系统,探究地球表层和深部的物质及能量流通。锂(Li)元素对流体活动敏感,在很多地质过程中(如风化作用、海水及热液蚀变等)同位素分馏显著,因此其含量和同位素比值变化可以记录洋壳蚀变过程中的重要信息。但由于蚀变洋壳的直接测试数据仍很匮乏,已有的Li元素和同位素数据解释存在较大争议,导致关于洋壳蚀变过程中Li元素迁移和同位素分馏的机制尚未达成共识。本文主要汇总了近年来针对大洋钻探获取的基岩岩芯Li同位素行为研究资料,探讨了在玄武岩蚀变和深海橄榄岩蛇纹石化过程中影响Li元素迁移和同位素分馏的主要因素(如蚀变温度、蚀变流体的化学组成、水-岩比值、次生矿物沉淀等),并进一步提出近期工作可以在以下方面加强:①继续完善Li储库和提高分析测试精度;②进行不同空间尺度下的Li同位素研究;③关注动力学分馏对高温蚀变过程中Li同位素行为的影响;④开展Li同位素与其他同位素体系的联用。

  • 加载中
  • 图 1  不同环境下的Li同位素组成示意图[14]

    Figure 1. 

    图 2  自然界不同地质储库的Li同位素组成

    Figure 2. 

    图 3  不同钻孔岩芯的低温蚀变玄武岩Li含量(a)与δ7Li值(b)随深度变化散点图

    Figure 3. 

    图 4  不同钻孔岩芯的低温蚀变玄武岩Li含量(a)、δ7Li值(b)随蚀变程度变化散点图

    Figure 4. 

    图 5  不同钻孔岩芯的高温蚀变玄武岩Li含量(a)与δ7Li(b)随深度变化散点图

    Figure 5. 

    图 6  不同钻孔岩芯高温蚀变玄武岩Li含量(a)与δ7Li(b)随蚀变程度变化散点图

    Figure 6. 

    图 7  ODP 1272A、1274A钻孔岩芯蛇纹石化橄榄岩Li含量(a)与δ7Li(b)随深度变化散点图

    Figure 7. 

    图 8  西南印度洋脊(SWIR)蛇纹石化橄榄岩Li含量(a)与δ7Li(b)随蛇纹石化程度变化散点图

    Figure 8. 

    表 1  大洋钻探钻孔岩芯中低温蚀变玄武岩的Li含量和δ7Li值汇总

    Table 1.  Compilation of Li content and δ7Li values of low-temperature-altered basalts from ocean drilling cores

    钻孔编号Li含量
    /10-6
    平均Li含量
    /10-6
    δ7Li值
    /‰
    平均δ7Li值
    /‰
    数据来源
    ODP504B5.62~8.795.904.80~11.806.75Chan等[1]
    ODP896A4.00~7.96.314.40~12.608.17Chan等[1]
    IODP1256C2.87~9.256.001.06~5.283.02Gao等[18]
    IODP1256D4.17~13.15.582.24~6.134.57Gao等[18]
    DSDP417A12.10~71.4030.840.80~9.005.37Seyedali等[17]
    DSDP417D7.50~18.6011.94−0.80~7.103.73Seyedali等[17]
    DSDP418A5.80~18.3012.53−1.70~12.901.85Seyedali等[17]
    下载: 导出CSV

    表 2  大洋钻探钻孔岩芯中高温蚀变玄武岩的Li含量和δ7Li值汇总

    Table 2.  Compilation of Li contents and δ7Li values of high-temperature-altered basalts from ocean drilling cores

    钻孔编号Li含量
    /10-6
    平均Li含量
    /10-6
    δ7Li值
    /‰
    平均δ7Li值
    /‰
    数据来源
    IODP 1256D0.86 ~ 21.44.56−2.29 ~ 13.065.12Gao等[18]
    ODP 504B0.60 ~ 9.132.45−1.70 ~ 7.902.50Chan等[1]
    ODP 735B1.18 ~ 38.005.61Bach等[5]
    下载: 导出CSV
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出版历程
收稿日期:  2022-11-20
修回日期:  2023-01-09
刊出日期:  2023-06-28

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