科研之友
微信
新浪微博
Facebook
分享链接
摘要
The study area of this article covers the continental shelf of the East China Sea and the Okinawa Trough. Tectonically, the area is the seaward extension of the eastern China mainland, consisting of the East China Sea shelf basin, the Diaoyudao islands uplift-fold zone, and the Okinawa Trough Basin developed in Cenozoic. Lying at the conjunction between the Eurasian and Philippine plates, the neotectonic movement since Miocene and resultant geologic structure of this area are complicated and peculiar. Based on pervious data and studies, this paper makes a systematic and in-deep analysis to the features of the neotectonic movement in this region, involving geomorphology, geological structure, magma activity and earthquakes. Then, the dynamic conditions for the neotectonic movement of the study area are discussed. Neotectonic movement of East China Sea started from middle Miocene and the mechanism of the tectonic stress field changed from sinistral transtension to sinistral transpression. The neotectonic movement in this area is inhomogeneous, with the continental shelf basin inclining and subsiding slightly to the southeast, the Okinawa trough dominated mainly by crustal active rifting, and the Diaoyu Islands fold belt characterized by lateral compressive bending uplift. The active faults, mainly trending NNE and NE, are dominantly distributed in the continental shelf basin, especially in the Okinawa trough. Magmatism and earthquake activity are also mainly distributed in the east of the continental shelf basin, especially in the Okinawa trough. The neotectonic movement in East China Sea is co-influenced by the back arc mantle uplift which is caused by the subduction of the Philippine plate beneath the continental shelf of East China Sea and results in the NW-SE rifting of Okinawa trough, and the southeastward movement of South China block which is pushed by the lateral extrusion of eastern Tibet.
- 出版日期2014
- 单位中国地震局
