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    Li同位素组成对太古宙海水相关的表生环境过程的初步限定

    付露露 肖益林 张兴亮 王洋洋 谭东波

    付露露, 肖益林, 张兴亮, 王洋洋, 谭东波, 2021. Li同位素组成对太古宙海水相关的表生环境过程的初步限定. 地球科学, 46(6): 2073-2082. doi: 10.3799/dqkx.2020.108
    引用本文: 付露露, 肖益林, 张兴亮, 王洋洋, 谭东波, 2021. Li同位素组成对太古宙海水相关的表生环境过程的初步限定. 地球科学, 46(6): 2073-2082. doi: 10.3799/dqkx.2020.108
    Fu Lulu, Xiao Yilin, Zhang Xingliang, Wang Yangyang, Tan Dongbo, 2021. Preliminary Definition of Li Isotope Compositions on Surficial Environmental Processes Associated with Archean Seawater. Earth Science, 46(6): 2073-2082. doi: 10.3799/dqkx.2020.108
    Citation: Fu Lulu, Xiao Yilin, Zhang Xingliang, Wang Yangyang, Tan Dongbo, 2021. Preliminary Definition of Li Isotope Compositions on Surficial Environmental Processes Associated with Archean Seawater. Earth Science, 46(6): 2073-2082. doi: 10.3799/dqkx.2020.108

    Li同位素组成对太古宙海水相关的表生环境过程的初步限定

    doi: 10.3799/dqkx.2020.108
    基金项目: 

    国家自然科学基金项目 41673031

    详细信息
      作者简介:

      付露露(1995-), 女, 硕士研究生, 从事海相碳酸盐的Li同位素研究.ORCID: 0000-0002-1220-484X.E-mail: full17@mail.ustc.edu.cn

      通讯作者:

      肖益林, E-mail: ylxiao@ustc.edu.cn

    • 中图分类号: P597

    Preliminary Definition of Li Isotope Compositions on Surficial Environmental Processes Associated with Archean Seawater

    • 摘要: 研究试图利用Li同位素地球化学对太古代海水相关的表生环境过程进行初步的限定.通过对来自南非Kaapvaal克拉通的海相碳酸盐岩样品进行Li同位素分析,发现在3.0~2.9 Ga期间形成的碳酸盐岩δ7Li值为~+1‰,而在2.6~2.5 Ga期间,碳酸盐岩δ7Li值达到7‰~10‰.经过反演计算得到对应时代的海水Li同位素组成分别为~+12‰和~+20‰,均明显低于现代海水值(~+31‰),但是2.6~2.5 Ga期间的海水δ7Li值要比3.0~2.9 Ga时高出8‰.作为大陆硅酸岩风化的有效示踪剂,太古代海水较低的Li同位素组成表明当时的地表风化以源岩溶解为主,次生矿物形成极少,在3.0~2.5 Ga期间,海水整体温度下降以及次生矿物形成增加可能共同导致了海水δ7Li值的升高.通过对太古代碳酸盐岩的Li同位素研究能够有效反演古海水的Li同位素组成,并为了解太古代表生风化过程对海水的影响提供了新的信息.

       

    • 图  1  Kaapvaal克拉通简图与样品位置(改自Frimmel et al., 2005)

      Fig.  1.  Simplified map of Kaapvaal craton and sample regions (modified from Frimmel et al., 2005)

      图  2  样品照片及采样示意图

      a.Nsuze-1(3.0~2.9 Ga)来自Pongola Supergroup;b.Transvaal-1(2.6~2.5 Ga)来自Transvaal Supergroup;c.Transvaal-2(2.6~2.5 Ga)来自Transvaal Supergroup

      Fig.  2.  Photos of carbonate samples and sampling position

      图  3  不同温度下海水与碳酸盐岩间的分馏值(a)和太古代海水的Li同位素组成(b)

      Fig.  3.  Fractionation values between seawater and carbonate at different temperatures (a), Li isotope composition of Archean seawater (b)

      图  4  现代海水和太古代海水的Li同位素组成模型

      a图改自Li and West(2014)

      Fig.  4.  Li isotope composition models of modern and archean seawater

      图  5  海水δ7Li值的变化趋势

      Misra and Froelich(2012)von Strandmann et al.(2013, 2017);Sun et al.(2018)

      Fig.  5.  Variation trend of δ7Li in seawater

      表  1  碳酸盐中Li同位素和元素含量分析结果

      Table  1.   Analysis results of Li isotope and elemental contents in carbonate

      样品号 Li/Ca (μmol/mol) Ca/Mg (mol/mol) Fe/Ca (mmol/mol) Mn/Ca (mmol/mol) Al/(Ca+Mg) (μmol/mol) Li含量(10-6) δ7Li (‰) 2SD
      Nsuze-1
      Ns-1 2.54 2.04 73.99 11.14 0.93 0.6 1.1 0.1
      Ns-2 3.19 1.79 88.16 11.77 1.74 0.8 0.4 0.3
      Ns-3 2.93 1.85 74.66 9.82 1.01 0.7 0.9 0.1
      Ns-4 2.79 1.88 73.25 9.48 1.10 0.7 0.9 0.0
      Ns-4’ 2.92 1.87 74.28 9.59 1.09 0.7 1.1 0.1
      Ns-5 2.00 1.93 70.88 9.38 0.72 0.5 0.6 0.2
      Ns-6 2.03 1.97 60.08 8.01 0.52 0.5 1.0 0.0
      Ns-7 2.08 1.96 64.99 8.78 0.71 0.5 0.5 0.0
      Ns-8 4.19 1.89 79.31 10.69 2.27 1.0 1.5 0.1
      Ns-9 2.86 1.87 81.17 11.42 1.30 0.8 0.8 0.3
      Transvaal-1
      Tr-1-1 1.14 1.89 34.51 33.68 0.08 0.3 7.3 0.1
      Tr-1-2 1.23 1.95 30.07 33.13 0.14 0.4 7.7 0.0
      Tr-1-3 1.30 1.96 32.25 33.56 0.12 0.3 6.7 0.1
      Tr-1-4 1.13 1.90 24.49 32.52 0.19 0.4 7.3 0.6
      Tr-1-4 1.67 1.86 23.72 32.25 0.05 0.4 7.4 0.2
      Tr-1-5 1.03 1.91 33.40 34.37 0.02 0.3 7.3 0.2
      Tr-1-6 1.35 1.88 32.96 34.81 0.05 0.4 7.0 0.3
      Tr-1-7 1.24 1.88 34.02 34.56 0.02 0.4 6.9 0.1
      Tr-1-8 1.46 1.91 31.95 34.56 0.06 0.4 7.0 0.0
      Tr-1-9 1.42 1.98 50.46 35.93 0.09 0.4 6.6 0.3
      Tr-1-10 1.32 1.86 32.40 33.44 0.07 0.4 7.0 0.2
      Transvaal-2
      Tr-2-1 2.40 1.91 35.92 44.03 0.18 0.6 10.2 0.2
      Tr-2-2 2.82 1.90 31.17 42.10 0.11 0.7 10.0 0.1
      Tr-2-3 2.29 1.86 33.40 42.81 0.09 0.7 9.1 0.1
      Tr-2-4 3.23 1.92 28.51 41.78 0.08 0.8 9.5 0.0
      Tr-2-4 3.45 1.94 28.52 41.46 0.09 1.0 9.2 0.2
      Tr-2-5 3.18 1.94 45.53 49.54 0.22 0.9 9.8 0.0
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