Origin of pore water in Kumano mud volcanoes

• TOKI Tomohiro

  Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus

• HIGA Ryosaku

  Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus

• TANAHARA Akira

  Instrument Research Center, University of the Ryukyus

• IJIRI Akira

  Kochi Institute for Core Sample Research, JAMSTEC

• TSUNOGAI Urumu

  Earth and Planetary System Science, Faculty of Science, Hokkaido University Graduate School of Environmental Studies, Nagoya University

• ASHI Juichiro

  Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, The University of Tokyo

Bibliographic Information

Other Title

• 熊野泥火山における間隙水の起源
• クマノ デイカザン ニ オケル カンゲキスイ ノ キゲン

Abstract

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.

Journal

• Chikyukagaku

  Chikyukagaku 47 (4), 221-236, 2013

  The Geochemical Society of Japan

Keywords

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

Details

• CRID: 1390282680718291712
• NII Article ID: 110009767288
• NII Book ID: AN00141280
• DOI: 10.14934/chikyukagaku.47.221
• ISSN: 21885923
• ISSN: 03864073
• HANDLE: 20.500.12000/37686
• NDL BIB ID: 025161720
• Web Site: https://u-ryukyu.repo.nii.ac.jp/records/2008857
• Web Site: http://id.ndl.go.jp/bib/025161720
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I025161720
• Text Lang: ja
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • CiNii Articles
  • KAKEN
  • Crossref
• Abstract License Flag: Disallowed