摘要
利用二维、三维地震资料,结合多波束水深测量,在南海北部白云凹陷发现大型海底滑坡。白云大型海底滑坡可分为滑坡根部、滑坡主体和滑坡前缘3个主要部分,广泛发育滑坡陡壁、滑塌沟谷、滑移面、滑坡台阶等典型滑坡地貌。地震相特征表现为楔状弱振幅杂乱地震相,块状平行或波状弱振幅中连续地震相,席状亚平行/波状弱振幅连续地震相,谷状水平充填中振幅、中连续地震相和丘状/透镜体状前积地震相等5种典型地震相特征。初步估算白云海底滑坡范围约为13000km2,滑坡分布受地形和海底沉积物岩性控制,晚期活动在中更新世。白云大型海底滑坡位于深水油气和天然气水合物的富集区,对油气和天然气水合物成藏作用和勘探开发具有重要的影响。
Using the recent seismic data and multi-beam bathymetric map, a large-scale landslide is discov- ered in Baiyun depression in the north margin of South China Sea, which is called ＂Baiyun landslide＂. Baiyun landslide is composed of three obvious parts, namely landslide root, landslide body and landslide front. This landslide shows five seismic facies： wedge weak-amplitude disorder facies, massive weak-am- plitude parallel/wavy facies, drape low amplitude parallel/wavy facies, filling medium-amplitude facies and mound/lens foreset facies. According to geography and lithology characters of seafloor sediments, the dis- tribution of Baiyun landslide which is about 13 000 km2 is delineated. Because of the location in the area of deep-water hydrocarbon and gas hydrate, Baiyun landslide is significant to the exploration and development of oil, gas and hydrate.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2008年第6期69-77,共9页
Marine Geology & Quaternary Geology
基金
国家自然科学基金项目(40876032)
国家高技术研究开发计划项目(2006AA09Z349)
关键词
海底滑坡
变形特征
大陆坡
南海北部
submarine landslide
sedimentary deformation
continental slope
South China Sea
