珠江口盆地中新生代主要断裂特征和动力背景分析  

MESO-CENOZOIC FAULTS IN ZHUJIANG RIVER MOUTH BASIN AND THEIR GEODYNAMIC BACKGROUND

作　　者：陈汉宗[1] 吴湘杰[1] 周蒂[1] 王万银[2] 郝沪军[3] 

机构地区：[1]中国科学院南海海洋研究所与广州地球化学研究所边缘海地质重点实验室,广东广州510301 [2]长安大学地质工程与测绘工程学院,陕西西安710054 [3]中国海洋石油有限公司深圳分公司,广东深圳518067

出　　处：《热带海洋学报》2005年第2期52-61,共10页Journal of Tropical Oceanography

基　　金：国家自然科学基金重点项目(40238060);国家重点基础研究发展规划项目(G20000467 02);中国科学院重点方向项目(KZCX2 SW 117)

摘　　要：对新处理及新采集的地质地球物理资料进行综合分析,结合前人研究成果,编制了中生代和新生代珠江口盆地主要断裂图,讨论了主要断裂的存在证据、展布形态、活动性质以及它们与盆地各级构造发育的关系等基本特征,并初步分析了它们形成演化的地球动力学背景。珠江口盆地断裂主要由NEE向和NW向断裂组组成,其次为NWW向断裂组和NE向断裂组。中生代西太平洋俯冲带呈NE SW向穿过南海东北部,相伴的有NE向火山弧、弧前盆地等压性构造和NW向左行走滑断裂,构成左行压扭体系。晚白垩纪至新生代NEE及NWW向断裂带控制了大规模张裂和沉积盆地的形成,又被NW向断裂带错切,形成了南北分带、东西分块的构造格局,显示了右行张扭应力场特征。Maps of Mesozoic and Cenozoic major faults in the Zhujiang River Mouth Basin are compiled. Evidence, layout, nature, relation with basin development, and geodynamics of these faults are discussed. Faults in the Zhujiang River Mouth Basin are mainly in NEE, NWW, NW and less in NE orientations. In Mesozoic era the subduction belt of the West Pacific passed through the northeastern South China Sea, accompanied by NE-running volcanic arc, forearc basins and NW-running left-lateral strike-slip faults, indicating a left-lateral trans-compressional stress field. From Late Cretaceous to Cenozoic era, NEE and NWW extensional faults controlled the formation of large sedimentary basins, which was offset by NW strike-slip faults. This resulted in a structural pattern of 'N-S zonation and E-W blocking' of the area, indicating a right-lateral trans-tensional stress field.

关 键 词：断裂 地质构造 地球物理 珠江口盆地 南海 

分 类 号：P542.3[天文地球—构造地质学]