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《Acta Sedimentologica Sinica》 2018-03
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Sedimentary Characteristics and Stratigraphic Age of the Thick-Bedded Coarse Clastic Rocks in the Yingen-Ejin Banner Basin,Northern China

CHEN ZhiJun;LIU Duo;LIU HuChuang;REN LaiYi;HAN Wei;GAO YiWen;ZHAO ChunChen;LI KeShe;Reseach Institute of Yanchang Petroleum (Group) Co.Ltd.;Natural Gas Storage Management,Changqing Oilfield Company,Petro China;Xi'an Center of Geological Survey,CGS;  
The thick-bedded coarse clastic rocks at the bottom of the Mesozoic erathem were widely developed in the Yingen-Ejin Banner Basin,northern China,whose age was determined in combination with their sedimentary characteristics in this study. The coarse clastic rocks deposited in a fan sedimentary environment developed at the initial stage of the sags,and the sedimentary facies were fan delta and underwater fan etc.. The coarse clastic rocks were characterized by " extensive development and locally increased thickness" and deposited during the stable and continuous subsidence of the basin with stable depositional rate. The deposition time of the coarse clastic rocks was 115.6-137.0 Ma determined by zircon U-Pb chronology,corresponding to the age of early Cretaceous period. The sporopollen assemblages of these rocks were in a combination of Classopollis-Protoconiferus-Perinopollenites,and the Ostracod fossils were mainly composited of single rib Actress,Metacypris,Lycopterocypris,etc.. The fossil characteristics were similar to that of the Early Cretaceous established by predecessors in the Yingen-Ejin Banner and peripheral basins.Thus,the age of the coarse clastic rocks should be early Cretaceous period,and their bottom boundary could be defined as the regional marker layer of the early Cretaceous strata. These results do not only solve the problems including the lack of evidence on stratigraphic division,shortage of unified stratigraphic classification scheme but also provide information about the Mesozoic sags forming era and potential tectonic evolution of the Triassic to Jurassic period without other stratigraphic records.
【Fund】: 国家自然科学基金项目(41202104 41072159);; 陕西延长石油(集团)有限责任公司科技攻关项目(ycsy2016ky-A-09)~~
【CateGory Index】: P535;P588.21
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