南海西北陆坡天然气水合物调查区滑坡带特征及成因探讨

doi:10.11978/j.issn.1009-5470.2012.05.004

Abstract

Abstract: Several cruises of gas hydrate resource survey have been carried out at Qiongdongnan continental slope, Xisha trough as well as Shenhu area since 1999. The geological data revealed that sub-marine slides were developed in the northwestern continental slope of the South China Sea. Three landslide zones were identified based on high-resolution single-channel seismic profiles and multi-beam echo sounding data. This paper discusses in detail the characters and formation mechanism of these landslide zones. Shenhu landslide zone is about 100 km long, 25km wide, and is oriented along the NE-SW direction at a water depth of 400?600m. It has close relationship with gas hydrate dissociation and stable geological engineering condition. Xisha trough northern slope landslide zone is about 90 km long, 15?20km wide, and has an EW trending at a water depth of 2000?3100m. It was formed by huge thickness sediment movement under process of gravity. Xisha trough slide has a better geological engineering condition, but its slide fan still can be seen in some unstable segments. Qiongdongnan continental slope landslide zone is about 150 km long, 5?10km wide, and is oriented in a NE-SW direction at a water depth of 250?850m. It was affected by active faults and bottom current erosion, and has an unstable geological condition. The results of this study can be a scientific base for gas hydrate survey and exploration.

Key words: South China Sea, continental slope, gas hydrate, landslide zones, characteristics

CLC Number:

X43: P618.13

CHEN Hong-jun,HUANG Lei,PENG Xue-chao,WU Jiao-qi,LI Wen-cheng,WANG Ying-min. Discussion of characteristics and formation of landslide zones in the gas hydrate survey area of northwest continental slope, the South China Sea[J].Journal of Tropical Oceanography, 2012, 31(5): 18-25.

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Discussion of characteristics and formation of landslide zones in the gas hydrate survey area of northwest continental slope, the South China Sea

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