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Sedimentary processes and development of the Zenisu deep-sea channel, philippine Sea

Chinese Science bulletin 2003年第B6期48卷 92-97页

作者： WU Shiguo~(1,2) & Sakamoto Izumi~3 1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China 2. kiy Laboratory of Marine Sedimentology and Environmental Geology, State Oceanic Administration. Qingdao 266061, China 3. Japan Marinc Science & Technology Center. Yokosuka 2370061. Japan Institute of Oceanology Chinese Academy of Sciences Qingdao China Key Laboratory of Marine Sedimentology and Environmental Geology State Oceanic Administration Qingdao China Japan Marine Science & Technology Center Yokosuka Japan

Zenisu deep-sea channel originated from a volcanic arc region, Izu-Ogasawara Island Arc, and vanished in the Shikoku basin of the philippine Sea. According to the swath bathymetry, the deep-sea channel can be divided into three segments. They are Zenisu canyon, E-W fan channel and trough-axis channel. A lot of volcanic detritus were deposited in the Zenisu Trough via the deep-sea channel because it originated from volcanic arc settings. On the basis of the swath bathymetry, submersible and seismic reflection data, the deposits are characterized by turbidite and debrite deposits as those in the other major deep-sea channels. Erosion or few sediments were observed in the Zenisu canyon,whereas a lot of turbidites and debrites occurred in the E-W channel and trough axis channel. Cold seep communities,active fault and fluid flow were discovered along the lower slope of the Zenisu Ridge. Vertical sedimentary sequences in the Zenisu Trough consist of the four post-rift sequence units of the Shikoku basin, among which Units A and b are two turbidite units. The development of Zenisu canyon is controlled by the N-S shear fault, the E-W fan channel is related to the E-W shear fault, and the trough-axis channel is related to the subsidence of central basin.

关键词：沉积过程菲律宾海海沟海洋沉积学四国盆地海洋深测术火山碎石地震数据浊流岩

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