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Deep-tow survey in the KAIKO-Nankai cold seepage areas

1992; Elsevier BV; Volume: 109; Issue: 3-4 Linguagem: Inglês

10.1016/0012-821x(92)90097-f

1385-013X

K. Kobayashi, Juichiro Ashi, Jacques Boulègue, H. Cambray, Nicolas Chamot‐Rooke, Hiromi Fujimoto, Toshio Furuta, Jean Toshimichi Iiyama, Tomomi Koizumi, K. Mitsuzawa, Hiroyasu Monma, Masafumi Murayama, Jiro Naka, Masao Nakanishi, Yasuo Ogawa, Kiyoshi Otsuka, Makoto Okada, Atsushi Oshida, N. Shima, Wonn Soh, Akira Takeuchi, Machiko Watanabe, Toshio Yamagata,

Methane Hydrates and Related Phenomena

Deep-sea biological communities associated with cold venting were located within the eastern portion of the Nankai Trough using a deep-towed TV system. Five continuous lines (approximately 200 km long) were observed. Bivalve communities were found both in the Tenryu Canyon outlet region and at the outcrop of the frontal thrusts of the accretionary wedge off Cape Omaezaki. The former is a site at which biological communities had been found during the KAIKO dives in 1985. However, the second site appears to be associated with larger scale venting and was chosen for the 1989 KAIKO-Nankai submersible cruise. Three small mud volcanoes with diameters of several hundred meters and heights of several tens of meters are found in the Seabeam topography map, but the present survey showed neither evidence of recent venting nor biological communities.