沈み込んだ炭素と背弧海盆におけるその挙動 Carbon Geodynamic Cycle in a Back-arc Basin Region

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Based on δ <SUP>13</SUP>C values and CO<SUB>2</SUB>/ <SUP>3</SUP>He ratios of North Fiji Back-Arc Basin basalt glasses, wediscuss the carbon geochemical cycle in the subduction zone. Among the North Fiji Back-ArcBasin basalt glasses, there is a close correlation among CO<SUB>2</SUB>/ <SUP>3</SUP>He ratios, δ <SUP>13</SUP>C value, and<SUP>143</SUP>Nd/ <SUP>144</SUP>Nd ratios. The CO<SUB>2</SUB>/ <SUP>3</SUP>He ratios and the δ <SUP>13</SUP>C values of North Fiji Basin basalt maybe attributed to binary mixing between the mantle component (low-CO<SUB>2</SUB>/ <SUP>3</SUP>He, high-δ <SUP>13</SUP>C, andhigh-<SUP>143</SUP>Nd/ <SUP>144</SUP>Nd) and the subducted (recycled) component (high-δO<SUB>2</SUB>/ <SUP>3</SUP>He, low-δ<SUP>13</SUP>C, and low-<SUP>143</SUP>Nd/ <SUP>144</SUP>Nd). From a simple mass balance calculation, it is derived that the subductedend-member (recycled carbon) has 70% carbonate and 30% organic matter in origin.Assuming that complete decomposition of the subducted organic matters has occurred, most (about 90%) carbonates are not decomposed, because the amounts of subducting carbonatesand organic matters throughout the North Fiji subduction zone are estimated in a ratio of20: 1. This suggests that carbonate can be transported into the mantle through the subduction zones.

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  • 地學雜誌  

    地學雜誌 109(4), 636-645, 2000-08-25 

    Tokyo Geographical Society

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各種コード

  • NII論文ID(NAID)
    10004724577
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    0022135X
  • NDL 記事登録ID
    5467563
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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