Hydrothermal fluid flow system around the Iheya North Knoll in the mid-Okinawa trough based on seismic reflection data

Takeshi Tsuji, Ken Takai, Hisashi Oiwane, Yasuyuki Nakamura, Yuka Masaki, Hidenori Kumagai, Masataka Kinoshita, Fujio Yamamoto, Tadashi Okano, Shin'ichi Kuramoto

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

Seismic reflection data around the Iheya North Knoll hydrothermal field provide insights into geological structures that control subseafloor hydrothermal fluid flow in the sediment-covered continental backarc basin of the mid-Okinawa Trough. We identified the seismic expression of widespread porous volcaniclastic pumiceous deposits and intrusions as a result of silicic arc volcanism. The porous and permeable volcanic deposits are distributed in an area extending updip from the thick succession of the deep trough to the seafloor at the hydrothermal field. Their regional structure focuses the flow of hydrothermal fluids derived from the surrounding trough-fill sediments and directs them to the vents of the hydrothermal field. The high concentrations of CH 4 and NH 4 in the fluids of the hydrothermal field are likely derived from the interaction of migrating fluids with trough-fill sediments.

Original languageEnglish
Pages (from-to)41-50
Number of pages10
JournalJournal of Volcanology and Geothermal Research
Volume213-214
DOIs
Publication statusPublished - Feb 1 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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