Recharge/discharge interface of a secondary hydrothermal circulation in the Suiyo Seamount of the Izu-Bonin arc, identified by submersible-operated heat flow measurements

M. Kinoshita, Y. Kawada, A. Tanaka, T. Urabe

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Hydrothermal activity within the caldera of Suiyo Seamount was investigated in detail by heat flow measurements using HOV/ROV through five research cruises in 2001-2003. The hydrothermal regime in the Suiyo-seamount is characterized by a geochemically uniform fluid, shallow reservoir depth, very permeable seafloor, and venting without creating big chimneys. Heat flow is highest (> 10 W/m2) within the active venting area. On the western and southern periphery, some heat flow values are lower than 0.3 W/m2, only several tens of meters away from the venting area. To the east, heat flow is 2-4 W/m2, indicating a more uniform reservoir overlain by impermeable layers. High temperature zones below seafloor, with non-linear temperature profiles, are identified within 5 m from isolated vents indicating secondary, probably transient circulations. We believe that we obtained several lines of direct evidence for discharge and recharge activity and their interface near the vents, constrained by the precipitation and permeability structure around the vent. Hydrothermal regime at the Suiyo site consists from a 100-m scale stable circulation to a 1-m scale local transient pattern. This multiple-scale circulation pattern, also identified at other hydrothermal sites, would be constrained by the distribution of heat source and hydrological properties near the seafloor.

Original languageEnglish
Pages (from-to)498-508
Number of pages11
JournalEarth and Planetary Science Letters
Volume245
Issue number3-4
DOIs
Publication statusPublished - 2006 May 30
Externally publishedYes

Keywords

  • Suiyo seamount
  • heat flow
  • hydrothermal system
  • permeability

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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