Chemical characteristics of newly discovered black smoker fluids and associated hydrothermal plumes at the Rodriguez Triple Junction, Central Indian Ridge

Toshitaka Gamo, Hitoshi Chiba, Toshiro Yamanaka, Takamoto Okudaira, Jun Hashimoto, Shinji Tsuchida, Jun ichiro Ishibashi, Satoshi Kataoka, Urumu Tsunogai, Kei Okamura, Yuji Sano, Ryuichi Shinjo

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114 Citations (Scopus)

Abstract

The chemical characteristics of hydrothermal fluids in the Indian Ocean have been revealed for the first time. A hydrothermal field (called the Kairei field), including active black smoker chimneys, was discovered by ROV Kaiko dives at 25°19.17′S, 70°02.40′E (~ 2450 m depth) on the southwestern flank of an off-axis knoll located ~ 15 miles north of the Rodriguez Triple Junction, Central Indian Ridge, after detailed tow-yo surveys of the hydrothermal plume distribution. The temperature of the fluid expelled from the most active chimney was almost stable (359-360°C) throughout three successive days of fluid sampling. The endmember fluid has a chemical composition similar to the hydrothermal fluids sampled from sediment-starved mid-ocean ridges in the Pacific and the Atlantic oceans, suggesting typical interactions between hot fluid and mid-ocean ridge basalts in the subseafloor reaction zone.

Original languageEnglish
Pages (from-to)371-379
Number of pages9
JournalEarth and Planetary Science Letters
Volume193
Issue number3-4
DOIs
Publication statusPublished - Dec 1 2001

Keywords

  • Black Smokers
  • Central Indian Ridge
  • Geochemistry
  • Hydrothermal vents
  • Plumes
  • Rodriguez Triple Junction

ASJC Scopus subject areas

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

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    Gamo, T., Chiba, H., Yamanaka, T., Okudaira, T., Hashimoto, J., Tsuchida, S., Ishibashi, J. I., Kataoka, S., Tsunogai, U., Okamura, K., Sano, Y., & Shinjo, R. (2001). Chemical characteristics of newly discovered black smoker fluids and associated hydrothermal plumes at the Rodriguez Triple Junction, Central Indian Ridge. Earth and Planetary Science Letters, 193(3-4), 371-379. https://doi.org/10.1016/S0012-821X(01)00511-8