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Tectono-Lithofacies-Palaeogeography of China in the Early Sinian
详细信息   
摘要
In the early Sinian,marine sediments began to prevail on all main plates of China,and the earliest effective marine hydrocarbon source rocks began to develop;it is the time of the beginning of a new cycle of ocean spreading,plate disperse and marine transgression,and the main plates of China had an overall tectonosedimentary framework of archipelagic ocean.The concretion age,scale and stability of blocks controlled the lithofacies-palaeogeographical characteristics of the three main paraplatforms and their peripheral areas to a great extent.The North China paraplatform had the earliest concretion age,the largest scale and the highest stability,so during the early Sinian,a large area of old land was developed with clastic rocks of shoreland facies on the edge of the platform,while both shallow carbonate platform facies and deep slope facies were not developed.The Tarim paraplatform was characterized by coexistence of continental and marine facies,and there were two eroded old land areas:the North Tarim and the Middle Tarim,from which outwards it is characterized by epicontinental onshore facies clastic rocks and mixed sediments of clinothem with basin facies developed successively around the two old land eroded areas.The Yangtze paraplatform was almost all submerged and developed a complete facies sequence from platform,clinothem to basin deposits,except that old land existed in the Kang-Dian(i.e.,Xikang-Yunnan)area.The tectono-sedimentary framework had longterm inheritant effects,which manifested in two main aspects:(1)during the cycle of ocean spreading and marine transgression from the early Sinian to the early period of the Early Paleozoic,the Yangtze paraplatform and Tarim paraplatform were more tended to develop marine hydrocarbon source rocks of passive continental margin clinothem-basin facies than the North Chinaparaplatform;(2)during the cycle of ocean closing and marine regression in the late period of the Early Paleozoic,the North China paraplatform was subjected to the marine regression earlier,the Yangtze paraplatform and Tarim paraplatform retained marine sedimentary environment during a relatively long period,and,moreover,hydrocarbon source rocks of deep water depression facies were developed better in these two paraplatforms than in the North China paraplatform.

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