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ABSTRACT: Current Research at the Izena Hydrothermal Field in the Okinawa Trough, Pt. 2, Distribution and Character of Sulfide Mounds and Alternation Zones Investigated during the HAKUREI-MARU Cruise,

Author(s): Tetsuro Urabe, Yoshihisa Okuda, Ko-Ichi Nakamura, Katsumi Marumo, Kiyokazu Nishimura, Eiichi Kikawa, Naoki Mita, Tomoyuki Moritani, Masataka Kinoshita, Andreas Marten, Peter Halbach

Izena hydrothermal site (JADE site) was intensely studied employing transponder-GPS navigation system during the GH89-3 cruise conducted by Geological Survey of Japan in the summer of 1989. Detailed sampling by the camera-installed box-corer and 3 to 5 m long gravity corer equipped with heat flow meters combined with deep-towed TV camera surveys revealed that hydrothermal sulfide deposits distribute over an area approximately 250,000 m2 which corresponds to the zone of hydrothermal alteration and extremely high heat flow. Sulfide ores exist either as chimneys, crust, or ore gravels in sediments. Sulfide mounds are partly surrounded by the native sulfur zone. This research will give us a clue to understand the three-dimensional fluid circulation beneath the acti e hydrothermal area.

AAPG Search and Discovery Article #90097©1990 Fifth Circum-Pacific Energy and Mineral Resources Conference, Honolulu, Hawaii, July 29-August 3, 1990