南海东北部的断裂分布及其构造格局研究

A STUDY ON FAULT DISTRIBUTION AND TECTONIC FRAMEWORK IN NORTHEASTERN SOUTH CHINA SEA

通过对南海东北部重磁异常的分析和处理,结合珠江口盆地、潮汕坳陷等地区的综合地质地球物理研究成果,根据研究区的重磁异常特征划分了4 个异常区。应用地球物理数据处理方法,推断了该区的主要断裂35条,其主要走向为NW、NE、NEE向及S N向4组。综合各方面研究成果在该区划分了7个构造单元。依据地震剖面、物性资料和重磁资料的分析,对南海东北部地区中生界的地层标定、构造与结构特征有了新的认识,研究了该地区前第三系基底和中生界的分布,并对南海东北部构造演化进行了探讨。

Based on processing and analyzing of gravity and magnetic anomaly data from the northeastern South China Sea, four anomaly zones were divided in the studied area combining integrated geological and geophysical interpretation results of the Zhujiang River Mouth Basin and Chaoshan sag. Up to 35 major faults, with 4 strike directions in NW, NE, NEE, and S-N, were deduced using geophysical data processing methods, and 7 tectonic units were determined on the base of all sorts of research results. Furthermore, a new cognition about stratum calibration and tectonic features of mesozoic erathem in the northeastern South China Sea was obtained by analyzing the data of seismic profiles, physical properties and gravity & magnetic material. The Pre-Tertiary basement and the distribution of Mesozoic erathem were studied, and the tectonic evolution was also discussed in the northeastern South China Sea.