Tarama Knoll: Geochemical and Biological Profiles of Hydrothermal Activity.
Tarama Knoll: Geochemical and Biological Profiles of Hydrothermal Activity.
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Tarama Knoll：热液活动的地球化学和生物剖面。
DOI：
10.1007/978-4-431-54865-2_40
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and M. Sunamura
中科院分区：
文献类型：
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作者：
Yamanaka;T.;H. Nagashio;R. Nishio;K. Kondo;T. Noguchi;K. Okamura;T. Nunoura;H. Makita;K. Nakamura;H. Watanabe;K. Inoue;T. Toki;K. Iguchi;U. Tsunogai;R. Nakada;S. Ohshima;S. Toyoda;J. Kawai;N. Yoshida;A. Ijiri;and M. Sunamura
Tarama Knoll位于日本西南部咲岛群岛Tarama岛以北约60公里处。小丘几乎呈圆锥形，山脚和峰顶分别距海面2000米和1490米（总起伏= 510米）。该地区已被确定为一个可能活跃的水下火山，称为“Tarama Knoll”（Otani et al. 2004）。然而，该地区实际上有两个独立的小丘。这座小山位于另一座山的东北部，那座山被命名为塔拉玛山。在R/VTanseimaru上的KT05-26巡航期间，在该地区附近的海底附近检测到甲烷异常，并被认为可能是热液起源。根据对海底的目视观察及其水深测量，这个小丘被认为是一个浮石锥。小丘峰顶附近常观测到致密浑浊水体，水体中检测到甲烷异常。这些观测结果表明，浑浊的水是热液羽流。在山顶附近的西南坡1510 - 1540米深处发现了一个富含铁的红棕色沉积物覆盖区域。在红棕色沉积区，可观察到微弱的透明流体闪烁，流体温度达到20℃。闪烁流体样品显示出较高的二氧化硅浓度（≥1 mM），表明流体与围岩相互作用。这些化学数据支持在塔拉玛丘陵地区存在活跃的热液循环。
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/VTanseimaru, 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.