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Quantification Sedimentology Features and Evolution in East North segment of Chang Ping Continetal Deposit Red Basin

Zhang Zejun (China University of Geosciences,Wuhan 430074)  
The Chang Ping continental deposit red basin consists of five alluvial fans forming different three stages. The different stages fans were separated by special bounding surfaces respectively. The fan roots were located at the north of the basin. The palaeoflow direction was fan shaped distribution. The average volume of the big gravels and mixing coefficient were biggest in the fan root, and were decreased nonlinear progessively from fan root to fringe. The material source area contyolled the composition of gravels. According to quantification sedimentology features and forming setting, it successively underwent orlginal pregnancy, denude and strong fill, three stages in the course of the Basin evolution. The proluvial events started in late Cretaceous Period and finished in Eogene Period Eocene Oligocene Epoch.
【CateGory Index】: P512.2,P53
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