MESOZOIC TECTONIC EVOLUTION AND PROTOTYPE BASIN CHARACTERS IN THE SOUTHERN EAST CHINA SEA SHELF BASIN
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摘要: 东海陆架盆地南部夹持于欧亚板块、太平洋板块与印度板块之间,是发育在前中生代基础之上的中、新生代叠合盆地。其构造演化受古太平洋板块俯冲及特提斯-喜马拉雅构造域的联合影响,经历了印支末期基隆运动、燕山期渔山和雁荡运动的叠加改造。结合浙闽隆起带中生代火成岩事件、盆地构造变形、沉积学的一些证据,通过海陆对比研究,认为东海陆架盆地南部早-中三叠世可能为面向古太平洋的被动大陆边缘盆地;晚三叠世-侏罗纪古太平洋板块已对中国大陆有较强的俯冲作用,东海陆架盆地及南部原型盆地为活动大陆边缘弧前盆地;白垩纪受控于滨海断裂表现为活动大陆边缘走滑拉分盆地;古新世-始新世火山岛弧向东移动,东海陆架变为弧后裂谷盆地。Abstract: The Southern East China Sea Shelf Basin is a Mesozoic-Cenozoic superimposed basin developed on the pre-Mesozoic basement at the junction of the Eurasian, Pacific and Indian plates. It has experienced the superimposed deformations of the Jilong, Yushan and Yandang movements and the tectonic evolution is obviously influenced by both the subduction of the Paleo-Pacific plate and the Thethys-Himalayas Tectonic Domain. Studies of Mesozoic igneous events, basin tectonic deformation, sedimentology and comparative study between land and sea have been carried out in this region. Results suggest that the Southern East China Sea Shelf Basin might be a passive continental margin basin facing the Paleo-Pacific in Early-Middle Triassic; a fore-arc basin along the active ocean margin while the Paleo-Pacific Plate intensely subducted under the East Asia continent in Late-Triassic and Jurassic; a strike-slip pull apart basin controlled by the offshore Fault in the Cretaceous and a backarc rift basin in Palaeocene-Eocene when volcanic arc migrated eastwards.
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Key words:
- tectonic evolution /
- prototype basin /
- Mesozoic /
- East China Sea Shelf Basin
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