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    中太平洋富钴结壳不同壳层He, Ar同位素组成

    李江山 方念乔 石学法 任向文 刘季花 崔迎春

    李江山, 方念乔, 石学法, 任向文, 刘季花, 崔迎春, 2012. 中太平洋富钴结壳不同壳层He, Ar同位素组成. 地球科学, 37(S1): 93-100. doi: 10.3799/dqkx.2012.S1.009
    引用本文: 李江山, 方念乔, 石学法, 任向文, 刘季花, 崔迎春, 2012. 中太平洋富钴结壳不同壳层He, Ar同位素组成. 地球科学, 37(S1): 93-100. doi: 10.3799/dqkx.2012.S1.009
    LI Jiang-shan, FANG Nian-qiao, SHI Xue-fa, REN Xiang-wen, LIU Ji-hua, CUI Ying-chun, 2012. Helium and Argon Isotopic Compositions of Various Crustal Layers of a Co-Rich Fe-Mn Crust from Central Pacific. Earth Science, 37(S1): 93-100. doi: 10.3799/dqkx.2012.S1.009
    Citation: LI Jiang-shan, FANG Nian-qiao, SHI Xue-fa, REN Xiang-wen, LIU Ji-hua, CUI Ying-chun, 2012. Helium and Argon Isotopic Compositions of Various Crustal Layers of a Co-Rich Fe-Mn Crust from Central Pacific. Earth Science, 37(S1): 93-100. doi: 10.3799/dqkx.2012.S1.009

    中太平洋富钴结壳不同壳层He, Ar同位素组成

    doi: 10.3799/dqkx.2012.S1.009
    基金项目: 

    国家自然科学基金 40976038

    中国大洋协会"十五"和"十一五"课题 DY105-01-04-14

    中国大洋协会"十五"和"十一五"课题 DY115-01-1-03

    科技部国际科技合作项目 2006DFB21620

    国家海洋局第一海洋研究所基本科研业务专项资金项目 2008T03

    详细信息
      作者简介:

      李江山(1969-), 男, 博士, 从事海洋地质研究.E-mail: lyjshan@163.com

    • 中图分类号: P736;P597

    Helium and Argon Isotopic Compositions of Various Crustal Layers of a Co-Rich Fe-Mn Crust from Central Pacific

    • 摘要: 对中太平洋MH海山富钴结壳不同壳层样品的稀有气体同位素丰度与组成测定结果表明: 富钴结壳中He同位素组成类似于深海沉积物, 主要来源于宇宙尘, 其3He含量由老到新呈现基本稳定的特征, 但在8 Ma时3He含量明显增加, 是其他样品的4~5倍, 与深海沉积物中3He含量在8 Ma达到最大值相吻合.在未磷酸盐化壳层中, D4、D5、D7的3He/4He比值也与深海沉积物的3He/4He比值(n×102 Ra)相当.磷酸盐化壳层中3He/4He比值相对较低, 是由于磷酸盐化过程中生成的碳氟磷灰石中富集4He而贫3He, 从而引起磷酸盐化壳层中4He含量明显增加, 导致磷酸盐化壳层3He/4He比值降低.结壳中结构相对疏松的壳层有利于对Ar的吸附, 大部分Ar可能是在结壳生长过程中从周围海水中直接吸附到结壳中的.

       

    • 图  1  富钴结壳MHD79分层取样位置

      Fig.  1.  Co-rich crust MHD79 stratified sampling position

      图  2  富钴结壳MHD79 He含量及3He/4He比值

      Fig.  2.  Co-rich crust MHD79 He contents and 3He/4He values

      图  3  富钴结壳MHD79 Ar含量

      Fig.  3.  Co-rich crust MHD79 Ar contents

      图  4  富钴结壳MHD79 3He/4He-He图解

      Fig.  4.  Co-rich crust MHD79 3He/4He-He diagram

      图  5  深海沉积物中3He通量与富钴结壳MHD79的3He含量关系图解

      Fig.  5.  3He flux of the abyssal sediments and 3He contents of Co-rich crust MHD79 relation diagram

      图  6  富钴结壳MHD79 3He-4He图解

      Fig.  6.  Co-rich crust MHD79 3He-4He diagram

      表  1  富钴结壳MHD79 He、Ar同位素组成

      Table  1.   Co-rich crust MHD79 He, Ar isotopes composition

      编号 层位 年代(Ma) 3He/4He(10-6) R/Ra He(10-8 cm3/g) 3He(10-16 cm3/g) 40Ar/36Ar 38Ar/36Ar Ar(10-6 cm3/g)
      D1 71 26.08±0.24 18.63 215.91 5.63 263.90 0.143 4 2.53
      D2 66 12.17±0.33 8.69 167.82 2.04 249.77 0.139 7 1.70
      D3 57 13.52±0.16 9.66 355.80 4.81 295.45 0.187 2 222.79
      D4 41 429.90±6.53 307.07 7.77 3.34 291.38 0.186 7 1 393.64
      D5 29 314.92±3.87 224.94 10.44 3.29 292.24 0.188 2 715.48
      D6 8 5 112.09±92.02 3 651.49 2.89 14.70 270.41 0.164 1 2.55
      D7 0 704.13±11.62 502.95 3.65 2.57 288.67 0.151 7 1.30
      注:年代数据依据Li et al.(2008),并利用Co通量定年法内插得出;R为样品的3He/4He实测值;文中数据在标准大气压条件下测得,下同.
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