苏皖下扬子区震旦纪—中三叠世海相层序地层

笔者运用板块构造和层序地层学的理论和方法,从露头区精细研究开始,寻找层序地层单元的识别标志和沉积相标志,拟建立起研究区综合层序地层格架。在此基础上结合区域构造资料和沉积背景分析,对苏皖下扬子区的震旦纪-中三叠世的层序地层进行划分,共认识别出11个二级层序,64个三级层序。

Sequence stratigraphic division of the Sinian -Middle Triassic marine strata in the Lower Yangtze area of the Jiangsu-Anhui zone

Influenced by the Pacific plate tectonic movement during the Mesozoic, the Lower Yangtze area of the Jiangsu Anhui zone is conspicuous by post collisional compression, NNE trending faulting and magmatism. These structural processes have controlled the formation of sedimentary basins and second order sequence boundaries, and resulted in heavily destruction of the original prolific sedimentary basins. The generalized sequence stratigraphic framework has been constructed for the study area with the aid of the theories and methods of plate tectonics and sequence stratigraphy. The Sinian-Middle Triassic strata in the Lower Yangtze area of the Jiangsu Anhui zone have been divided, on the basis of sequence stratigraphic markers and sedimentary facies indicators in integration with regional tectonic settings and sedimentary background, into 11 second order sequences and 64 third order sequences.