RIFTING OF PASSIVE MARGINS AND THE TECTONIC BEHAVIOR OF THE NORTHERN MARGIN OF SOUTH CHINA SEA
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摘要: 大陆边缘研究是板块构造运动史重建、地球环境演变研究与矿产资源开发的关键。火山型(volcanic passive margins)与非火山型(magma-poor passive margins)大陆边缘作为被动大陆边缘的2种基本类型,在结构特征、演化过程、洋陆过渡带等方面存在一定的相似之处,但二者在形成机制、构造过程、沉积特征等方面显著不同。向海倾斜的基底反射层(SDRS)以及其下高速异常体是火山型被动大陆边缘的典型标志,而非火山型被动大陆边缘以低角度拆离断层(S反射面)为主要标志。我国南海地处三大板块与两大构造域的结合部,构造特征复杂,北部大陆边缘构造属性一直备受争议。以国外典型被动大陆边缘研究成果为基础,开展多尺度构造综合研究与数值模拟分析,是行之有效的研究手段。
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关键词:
- 火山型被动大陆边缘 /
- 非火山型被动大陆边缘 /
- 南海北部陆缘 /
- 构造属性
Abstract: The study of continental margins is the key to the reconstruction of plate tectonic movement, the investigation of Earth's environment and the development of mineral resources. The volcanic passive margin and magma-poor passive margin are the two basic types of passive margins. Although there are similarities in structure, evolution and ocean-continent transitional zone, the mechanism, tectonic processes and sedimentary characteristics are significantly different in the two types of passive margins. The Seaward Dipping Reflectors Sequences (SDRS) and the high-speed abnormal body below are the typical signs of the volcanic passive margin, while a low angle detachment fault (S reflector surface) is the main indicator of the magma-poor passive margin. The tectonics of the South China Sea is very complicated because it is located in the juncture of the Tethyan and ancient Pacific Ocean tectonic domains. The tectonic behavior of the northern margin of South China Sea has remained as the focus of hot debate among scholars. Based on the researches of typical passive margins abroad, comprehensive multi-scale tectonic research and numerical simulation were suggested as effective means to better understand the tectonics of the northern margin of the South China Sea. -
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[1] Basic Geology
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