Diversity of fluid geochemistry affected by processes during fluid upwelling in active hydrothermal fields in the Izena Hole, the middle Okinawa Trough back-arc basin

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概要

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• Two active hydrothermal fields, Jade and Hakurei fields have been discovered within the Izena Hole, a rectangular 6 km × 3 km shape depression located in the middle Okinawa Trough back arc basin. In both fields, intense hydrothermal activity is represented by venting of high-temperature fluid (>300°C) and occurrence of sulfide/sulfate ore deposits. We collected hydrothermal fluids during dive expeditions of ROV Hyper Dolphin conducted in 2003, 2010 and 2011, in order to analyze both elemental and gas species. The geochemistry of high temperature hydrothermal fluids collected from the Jade and Hakurei fields is very similar to each other with exceptions in minor gas composition. Little temporal variation was observed in geochemistry of the high-temperature hydrothermal fluid of the Jade field over two decades, since a previous study carried out in 1989. These results suggest that these fluids are derived from a common fluid reservoir where fluid chemistry is basically controlled by fluid-mineral equilibria and gas species are dominantly contributed from the same magma. Venting of low temperature fluid (about 104°C) was discovered in the distal part of the Jade field, which was named as the Biwako vent. Chemical composition of the Biwako vent fluid was distinctive from that of the high temperature fluid in the proximal part of the Jade field, and could not be explained by simple dilution or cooling. This intra-field chemical diversity could be caused by phase separation and segregation during fluid upwelling, based on relationships in concentrations of Cl and major cations. On the other hand, the chemical diversity recognized in minor gas composition between the Jade and Hakurei fields is in accordance with results from previous plume survey. Difference in concentrations of minor gases such as H2 is attributed to contribution from thermal degradation of organic matter in the sediment, during fluid upwelling.

• 日本地球化学会の論文

著者

• Inagaki Fumio

  Kochi Jamstec

• Ishibashi Jun-ichiro

  Department Of Earth And Planetary Science Kyushu University

• Yamanaka Toshiro

  Graduate School Of Natural Science And Technology Okayama University

• Shibuya Takazo

  Precambrian Ecosystem Laboratory Japan Agency For Marine-earth Science And Technology (jamstec)

• Takahashi Yoshio

  Graduate School Of Science Hiroshima University

• Takai Ken

  Precambrian Ecosystem Laboratory (pel) Japan Agency For Marine-earth Science And Technology (jamstec

• Yokoyama Yuka

  Graduate School Of Science Hiroshima University

• Toki Tomohiro

  Faculty Of Science University Of The Ryukyus

• NAKAGUCHI YUZURU

  School of Science and Engineering, Kinki University

• MIYABE SHUNSUKE

  Graduate School of Natural Science and Technology, Okayama University

• KONNO UTA

  Institute of Biogeosciences (Biogeos), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

• NOGUCHI TAKUROH

  Faculty of Science, University of the Ryukyus

• YAMAGAMI SHOSEI

  Graduate School of Natural Science and Technology, Okayama University

• ONISHI YUJI

  Graduate School of Natural Science and Technology, Okayama University

• OMORI ERIKO

  Graduate School of Science, Hiroshima University

• HATADA KENTA

  School of Science and Engineering, Kinki University

• YOSHIZAKI MOTOKO

  Graduate School of Science and Engineering, Tokyo Institute for Technology

• KAWAGUCCI SHINSUKE

  Precambrian Ecosystem Laboratory (PEL), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

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• Diversity of fluid geochemistry affected by processes during fluid upwelling in active hydrothermal fields in the Izena Hole, the middle Okinawa Trough back-arc basin

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