Analysis of sedimentary characteristics and tectonic environment for Late Triassic Liushan Basin
Cao Gaoshe1 Yang Qihao1 Gao Lixiang1 Lin Yuxiang2 XingNana1 Zu Xinxu1 Xu Guangming1
1.School of Resource and Environment, Henan Polytechnic University, Jiaozuo, Henan 454003;2.A Brief Introduction to the College of Information Science and Engineering, Shandong University of Science and Technology,Qingdao,Shandong 266510
Based on measured geological profile and experiments including thinsection，grain size analysis and cathodeluminescence in Liushan Basin，the characteristics of sedimention and tectonic environment are investigated，by studying sedimentary facies firstly and combining sedimentary processes with tectonism 〖STBZ〗tightly. The studies indicated that the sedimentary facies of Upper Triassic series in Liushan Basin was mainly fan delta，retrogradational fan deltas at first and then progradational fan deltas. Evolution of sedimentary facies and analysis of provenance indicate synthetically that Liushan Basin is an isolated basin，the sediments mainly come from the orogenic belt surrounded the basin. The evolution of basin contains four stages：basin formation，subsidence smoothly，subsidence quickly and filling quickly，corresponding to the tectonic dynamics. The type of Liushan Basin may be the compressional，and it can be presumed further that Liushan Basin was a piggy basin companying the North China Block in collision with Yangzi Block during the Late Triassic.