南海珠江口盆地新构造运动特征
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摘要
通过对珠江口盆地海洋工程地质调查所发现的浅断层、海底滑坡、底辟、地震活动等地质灾害因素的特征分析,作者认为本区第四纪以来的断层有较强的活动性,其分布以北西西向占主导,在陆架边缘和上陆坡区最发育;盆地主体与相邻的东沙和神狐隆起区的差异升降显著,这就导致在现今的陆架-陆坡转折部位受重力作用而形成的滑动构造发育。盆地内所发现的底辟构造除泥丘外,还有火山岩墙存在;地震活动与活动断层发育有关,盆地北部和南部隆起区边缘是近代地震危险地带。因而认为本区新构造运动较为活跃。
After comprehensively analysing the geological hazards making use of marine engineering geologi- cal investigation at the Pearl River Mouth Basin in South China Sea, we find out that among the shallow fault, submarine landslide, diapir, earthquake, etc, faults are more active in this area since Quaternary. They mainly extend in north-west direction, and develop at the shelf edge and continental upslope. The notable differential elevation and subsidence in the main part of the basin and Dongsha-Shenhu uplift enable to the development of gliding structure which results from gravity at the pressent turning part of continental shelf and continental slope. Besides of the mudlump,there are many volcanic dikes (diapiric structure) developed in this basin; Earthquakes, often related to active fault and located at the the northern and southern borders of tectonic rises in the basin, are dangerous for marine engieering. From these we can say that the neotectonic of this area is more active.
After comprehensively analysing the geological hazards making use of marine engineering geologi- cal investigation at the Pearl River Mouth Basin in South China Sea, we find out that among the shallow fault, submarine landslide, diapir, earthquake, etc, faults are more active in this area since Quaternary. They mainly extend in north-west direction, and develop at the shelf edge and continental upslope. The notable differential elevation and subsidence in the main part of the basin and Dongsha-Shenhu uplift enable to the development of gliding structure which results from gravity at the pressent turning part of continental shelf and continental slope. Besides of the mudlump,there are many volcanic dikes (diapiric structure) developed in this basin; Earthquakes, often related to active fault and located at the the northern and southern borders of tectonic rises in the basin, are dangerous for marine engieering. From these we can say that the neotectonic of this area is more active.
引文
① 刘宗惠等,1992;南海珠江口盆地地质灾害因素、类型及特征分析;第二海洋地质调查大队。
① 冯志强等,1993;南海珠江口盆地海洋工程地质调查项目总报告;广州海洋地质调查局。
① 薛万俊、刘宗惠等,1988;南海珠江口盆地海洋工程地质调查报告(北尖岛幅);第二海洋地质调查大队。
① 、冯志强等,1993;南海珠江口盆地海洋工程地质调查项目总结报告;广州海洋地质调查局。
① 卢广智等,1988;珠江口盆地东沙隆起构造、沉积演化及油气藏形成条件;《珠江口盆地(东部)石油地质科研报告第二集》;南海东部石油公司研究所。
② 秦国权,1988;东沙群岛东北海底晚第三纪海相地层露头的发现及其地质意义,《珠江口盆地(东部)石油地质科研报告第二集》;南海东部石油公司研究所。
① 李平鲁,1992;珠江口盆地新生代构造运动讨论;广东石油,no.16。
[1] 丁原章等,巴士系构造的地震危险性;华南地震,12卷2期。
[2] 张虎男等,1990;华南沿海新构造运动与地质环境;地震出版社。
[3] D.B.Prior and J.M.Coleman 1990;海底斜坡的不稳定性;海洋出版社。
[4] (?)叶米里扬娃,1984;滑坡作用的基本规律;重庆出版社。
① 冯志强等,1993;南海珠江口盆地海洋工程地质调查项目总报告;广州海洋地质调查局。
① 薛万俊、刘宗惠等,1988;南海珠江口盆地海洋工程地质调查报告(北尖岛幅);第二海洋地质调查大队。
① 、冯志强等,1993;南海珠江口盆地海洋工程地质调查项目总结报告;广州海洋地质调查局。
① 卢广智等,1988;珠江口盆地东沙隆起构造、沉积演化及油气藏形成条件;《珠江口盆地(东部)石油地质科研报告第二集》;南海东部石油公司研究所。
② 秦国权,1988;东沙群岛东北海底晚第三纪海相地层露头的发现及其地质意义,《珠江口盆地(东部)石油地质科研报告第二集》;南海东部石油公司研究所。
① 李平鲁,1992;珠江口盆地新生代构造运动讨论;广东石油,no.16。
[1] 丁原章等,巴士系构造的地震危险性;华南地震,12卷2期。
[2] 张虎男等,1990;华南沿海新构造运动与地质环境;地震出版社。
[3] D.B.Prior and J.M.Coleman 1990;海底斜坡的不稳定性;海洋出版社。
[4] (?)叶米里扬娃,1984;滑坡作用的基本规律;重庆出版社。
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