下扬子盆地的地壳深部构造与盆地演化的研究

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INFRASTRUCTURES OF LOWER YANGTZE BASIN AND THEIR RELATION TO EVOLUTION OF THE BASIN

摘要: 本文综合了1978—1981年江西永平爆破和湖北随县爆破的人工地震资料,结合区域布格重力异常特征,求得区域地壳厚度的空间展布,并对盆地的演化从深部地质出发作一初步探讨。

Abstract: Data of seismic sounding from two profiles shot in Yougping county, Jiangxi Province and Shui county, Hubei Province, which have been coupled with characteristics of regional Bouguer gravity anomalies, are digitized and processed to prepare a crustal isopachous map. It is concluded that, in general, the neotectonic movement were taken place in an overall tensional setting. Through tectonic cycles of Yanshan orogeny, Himalayan orogeny, Nworiented compressional movement of Pacific plate against Ryukyu region and the subduction of the Pacific Plate at the Ryukyu trench, the Ryukyu arc was separated from the Asian continent and, parallelling to the arc,the Nw-trending Okinawa trough and the East China Sea basin occured simultaneously in back arc area, resulting in a tectonic pattern of intersection of the present East China Sea basin with the NW-trending North Jiangsu-Southern Yellow Sea basin.

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