熊野泥火山における間隙水の起源

• 土岐 知弘

  琉球大学理学部海洋自然科学科

• 比嘉 良作

  琉球大学理学部海洋自然科学科

• 棚原 朗

  琉球大学機器分析支援センター

• 井尻 暁

  海洋研究開発機構高知コア研究所

• 角皆 潤

  北海道大学大学院理学研究院自然史科学部門地球惑星システム科学分野 名古屋大学大学院環境学研究科地球環境科学専攻大気水圏科学系

• 芦 寿一郎

  東京大学大気海洋研究所海洋底科学部門

書誌事項

タイトル別名

• Origin of pore water in Kumano mud volcanoes
• クマノ デイカザン ニ オケル カンゲキスイ ノ キゲン

抄録

We used push corers during manned submersible dives to take sediment samples to depths up to 40cm from the third and eighth Kumano Knolls. Boron (B) concentrations in pore water extracted from the sediment samples from the cold seep site were higher than would be explained by organic matter decomposition, suggesting that the pore water at the site was influenced by B derived from smectite-illite alteration. Additionally, the pore water at the cold seep site on the Kumano mud volcano showed high Li concentrations and positive oxygen isotope of pore water. These facts suggest the origin of the pore water would be clay mineral dehydration occurring between 150-160℃. The end-member concentration of B and Li is estimated to be 23±8mmol/kg and 0.8±0.3mmol/kg, respectively. The B/Li ratio of the end-member is evaluated to be 29±14, suggesting these elements would be released from sediment below 200℃. Given the geothermal gradient in this area, this finding suggests that the supplied fluid originates from environment deeper than 3.5km below the seafloor.

収録刊行物

• 地球化学

  地球化学 47 (4), 221-236, 2013

  一般社団法人日本地球化学会

キーワード

• Origin
• Pore water
• Kumano
• Mud volcano
• Boron
• Lithium
• Oxygen isotope
• Clay mineral dehydration

詳細情報

• CRID: 1390282680718291712
• NII論文ID: 110009767288
• NII書誌ID: AN00141280
• DOI: 10.14934/chikyukagaku.47.221
• ISSN: 21885923
• ISSN: 03864073
• HANDLE: 20.500.12000/37686
• NDL書誌ID: 025161720
• Web Site: https://u-ryukyu.repo.nii.ac.jp/records/2008857
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025161720
• 本文言語コード: ja
• データソース種別:
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  • NDL
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