珠江口盆地中部浅地层结构特征与海底不稳定因素研究  

STUDIES ON UNSTABLE SEABED FACTORS AND SHALLOW STRATUM STRUCTURAL FEATURES IN THE MIDDLE PART OF PEARL RIVER MOUTH BASIN

作　　者：柳枞阳 范时清[1] 袁友仁[1] 

机构地区：[1]中国科学院南海海洋研究所,广州510301

出　　处：《热带海洋》1991年第2期65-70,共6页

摘　　要：通过对“Sonne”号调查船第50航次的地震剖面资料分析,结合一些钻井资料,认为珠江口盆地中部第四纪以来的沉积可分为四套,其中层Ⅰ是浅海相沉积,属全新世;层Ⅱ,Ⅲ,Ⅳ是海陆相交替沉积,属更新世。在陆架区第四纪沉积厚220—400m,其中全新世沉积厚约29m。作者认为珠江口盆地的不稳定地质因素有:浅层断裂,埋藏古河道,浅层气,泥底辟,活动沙波,海底滑移,活动断裂与地震。Based on data of seismic profiles from SO 50 and several wells, the Quarternary sediments of the central part of Pearl River Mouth Basin can be divided into four layers. Stratum I is of Holocene neritic deposit and strata I , III and IV are of Pleistocene transitional sediments. The Quarternary is 220-400m thick in the shelf (Holocene, 29m). According to analyses of seismic data, the types of unstable geological factors in Pearl River Mouth Basin are: 1. surface and nearsurface faults, 2. buried channels; 3. nearsurface gas; 4. mud diapire; 5. sand waves; 6. submarine landslides; 7. active faults and earthquake, active faults trending NE-NNE, NW, and NEE-EW. These potential hazards and engineering constraints have also been analysed in this paper.

关 键 词：地层结构 海底 稳定性 珠江口 盆地 

分 类 号：P736[天文地球—海洋地质]