7 research outputs found
各地の深海底に存在する褐色変色域での微生物調査
BE11-P72ポスター要旨 / ブルーアース2011(2011年3月7日~8日, 東京海洋大学品川キャンパス)http://www.godac.jamstec.go.jp/darwin/cruise/natsushima/nt05-18/ehttp://www.godac.jamstec.go.jp/darwin/cruise/natsushima/nt10-06_leg2/ehttp://www.godac.jamstec.go.jp/darwin/cruise/natsushima/nt10-13_leg2/ehttp://www.godac.jamstec.go.jp/darwin/cruise/yokosuka/yk10-10/
Tarama Knoll: Geochemical and biological profiles of hydrothermal activity
Tarama Knoll is located about 60 km north of Tarama Island, Sakishima Islands, southwestern Japan. The knoll has an almost conical shape, with foot and summit depths of 2,000 and 1,490 m (total relief = 510 m) from the sea surface, respectively. This area has been identified as a possible active submerged volcano called “Tarama Knoll” (Otani et al. 2004). However, there are actually two separate knolls in the area. This knoll is located northeast of the other, which is named Tarama Hill. During the KT05-26 cruise on the R/V Tanseimaru, a methane anomaly was detected near the seafloor around the area and was considered to be of possible hydrothermal origin. Based on visual observation of the seafloor and its bathymetry, this knoll is considered a pumice cone. Dense turbid water is often observed around summit of the knoll, and a methane anomaly was detected in the water. These observations suggest that the turbid water is a hydrothermal plume. An iron-rich, red-brown sediment-covered area was discovered at a depth of 1,510–1,540 m on the southwestern slope near the summit. At the red-brown sediment area, a weak shimmering of clear fluid could be observed, and the fluid temperature reached 20 °C. Sampled shimmering fluid showed a high silica concentration (≥1 mM), indicating an interaction between the fluid and the surrounding rock. These chemical data support the occurrence of active hydrothermal circulation at Tarama Knoll
Evaluation of nutrient sources for the sponges inhabited around seafloor hydrothermal fields in the Okinawa Trough.
http://www.godac.jamstec.go.jp/darwin/cruise/natsushima/nt11-18/
The Tarama Knoll: Geochemical and Biological Profiles of Hydrothermal Activity
http://www.godac.jamstec.go.jp/darwin/cruise/natsushima/nt09-10_leg2/ehttp://www.godac.jamstec.go.jp/darwin/cruise/natsushima/nt10-06_leg2/ehttp://www.godac.jamstec.go.jp/darwin/cruise/natsushima/nt11-18/
南部沖縄トラフ多良間海丘に存在する酸化鉄被膜地帯での微生物調査: NT11-18 研究航海概要
http://www.godac.jamstec.go.jp/darwin/cruise/natsushima/nt11-18/