Marine shallow-water hydrothermal activity and mineralization at the Wakamiko crater in Kagoshima bay, south Kyushu, Japan

Junichiro Ishibashi, Miwako Nakaseama, Mariko Seguchi, Toru Yamashita, Shinsuke Doi, Takeaki Sakamoto, Kazuhiko Shimada, Nobutaka Shimada, Takuroh Noguchi, Tamotsu Oomori, Minoru Kusakabe, Toshiro Yamanaka

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Submarine hydrothermal fluid emanation from a small sediment mound associated with bubbling gas was observed in the Wakamiko crater that is located 5 km offshore at 200 m depth in Kagoshima bay, southern Kyushu, Japan. In 2003 and 2005, surface sediments (up to 30 cm) from inside and outside of the hydrothermal mound were sampled using the submersible ROV Hyper-Dolphine (JAMSTEC). Chemistry of pore fluids inside the mound showed a clear difference from those collected from outside the mound, which is explained by mixing of the ascending hydrothermal component and seawater. Estimated chemical composition of the hydrothermal end member suggests that the fluid experienced hydrothermal interaction at a temperature range of about 175 to 200 °C. This is consistent with the observed mound temperature of 137 °C. Hydrothermal minerals such as barite, stibnite, and realgar were identified in the mound sediment, suggesting their precipitation due to mixing of the ascending hydrothermal fluid with seawater. Isotopic composition of the hydrothermal endmember can be explained by mixing product of seawater, magmatic water and meteoric water. The marine shallow-water hydrothermal system in the Wakamiko crater is considered to be driven by a magmatic heat source beneath the crater, which also contributes elements such as arsenic, antimony, mercury and magmatic water to the hydrothermal fluid.

Original languageEnglish
Pages (from-to)84-98
Number of pages15
JournalJournal of Volcanology and Geothermal Research
Volume173
Issue number1-2
DOIs
Publication statusPublished - Jun 1 2008

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hydrothermal activity
shallow water
hydrothermal fluid
craters
crater
Japan
mineralization
Seawater
Fluids
Water
fluids
seawater
Sediments
sediments
realgar
sediment
stibnite
remotely operated vehicle
Barium Sulfate
water

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Marine shallow-water hydrothermal activity and mineralization at the Wakamiko crater in Kagoshima bay, south Kyushu, Japan. / Ishibashi, Junichiro; Nakaseama, Miwako; Seguchi, Mariko; Yamashita, Toru; Doi, Shinsuke; Sakamoto, Takeaki; Shimada, Kazuhiko; Shimada, Nobutaka; Noguchi, Takuroh; Oomori, Tamotsu; Kusakabe, Minoru; Yamanaka, Toshiro.

In: Journal of Volcanology and Geothermal Research, Vol. 173, No. 1-2, 01.06.2008, p. 84-98.

Research output: Contribution to journalArticle

Ishibashi, J, Nakaseama, M, Seguchi, M, Yamashita, T, Doi, S, Sakamoto, T, Shimada, K, Shimada, N, Noguchi, T, Oomori, T, Kusakabe, M & Yamanaka, T 2008, 'Marine shallow-water hydrothermal activity and mineralization at the Wakamiko crater in Kagoshima bay, south Kyushu, Japan', Journal of Volcanology and Geothermal Research, vol. 173, no. 1-2, pp. 84-98. https://doi.org/10.1016/j.jvolgeores.2007.12.041
Ishibashi, Junichiro ; Nakaseama, Miwako ; Seguchi, Mariko ; Yamashita, Toru ; Doi, Shinsuke ; Sakamoto, Takeaki ; Shimada, Kazuhiko ; Shimada, Nobutaka ; Noguchi, Takuroh ; Oomori, Tamotsu ; Kusakabe, Minoru ; Yamanaka, Toshiro. / Marine shallow-water hydrothermal activity and mineralization at the Wakamiko crater in Kagoshima bay, south Kyushu, Japan. In: Journal of Volcanology and Geothermal Research. 2008 ; Vol. 173, No. 1-2. pp. 84-98.
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