摘要
东海位于亚洲大陆东部滨太平洋构造域。根据刘光鼎院士的意见,中国东部大陆边缘海构造演化过程可归纳为陆核形成阶段(Ar-Pt1-2)—古全球构造阶段(Pt1-C)—中间构造变动阶段(P-T2)—新全球构造发展阶段(T3-Q)。最后的发展阶段主要表现为3次变革运动,即:T3-K1的挤压、改造;K2-E32的拉张、聚敛;E32-Q的俯冲、沉降,从而塑造出现今中国海、陆的大地构造面貌。东部大陆边缘海,以东海陆架盆地为代表,主要形成于晚白垩世至中新世,经历了断陷—拗陷—区域沉降3个演化阶段。东海一个特殊的地质构造即冲绳海槽,关于它的成因说法不一。但从它具有高热流、强地震、多火山、活断层等现代构造活动的显著特征,可以认为它是一个典型的发育在大陆边缘,由陆壳扩张而成,尚处于扩张早期的弧后活动盆地。
The East China Sea is located along the continental margin of east China's Mainland and in the junction of the Eurasian plate and the Pacific plate. Its evolutionary history could be summarized into four stages:stage of formation of the continental nuclei from Ar to Pt12,stage of ancient global tectonics from Pt1 to C,stage of tectonic deformation from P to T2,and stage of new global tectonics from T3 to Q.The last stage saw three deformations,namely,compression and reformation from T3 to K1,extension and convergence from K2 to E23,and subduction and subsidence from E33 to Q.These deformations resulted in the final formation of the tectonic framework of the China continent and its adjacent seas.A representative marginal sea to the east of China's Mainland,the East China Sea,began to form in late Cretaceous and completed the formation in mid Miocene,experiencing rifting,depression and regional subsidence stages.The Okinawa Trough is a specific geological phenomenon.There are arguments concerning origin of the sea.Based upon the evidence of high heat flow,intensive earthquake,frequent volcanic activities and active faults,it is inferred as a typical backarc basin.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2002年第4期1-6,共6页
Marine Geology & Quaternary Geology
关键词
构造格局
东海
构造活动
地质构造
中国
冲绳海槽
tectonic framework
tectonic tract
geological evolution
west circumPacific
the East China Sea
