Analysis Of Sedimentary Facies And Sedimentary Environment Of Qinghai Province Xiangpi Mountain Carbon And Triassic Strata Of Rocks

The study area is located in the rubber Mountain Region in Qinghai province,which belongs to Zongwulong Rock tectonic belt located between the North Qaidam tectonic belt and southern Qilian structural zone.It has undergone complex geological processes.Based on field geological investigation,sedimentology basic idea as the guide,a comprehensive analysis of the rock characteristics,primary sedimentary structural features and paleontological features,etc,we found in the study area is mainly exposed Ganjia Formation in Carboniferous to Permian Formation and Longwuher Formation in the Early Triassic.Ganjiahu group can be divided into three lithologic: A lithologic of some thick layer to the thick layer of limestone,B lithologic of limestone rock plywood,C lithologic of sand slate limestone,and Ganjia group showed an overall steepening distal ramp carbonate platform sedimentary.Longwuhe bottom-up group is divided into three lithologic between the three sections in order to stabilize the layered limestone for the sector,bottom-up formation presented granularity thinner,darker,shale content increases the characteristics,and Longwuhe Formation is a typical shelf turbidite deposits.According to "today on the ancient" the guiding principle,characterized by sedimentary facies analysis,the rubber Mountain area occurs in the Carboniferous rifting formed Zongwulong Rock tectonic belt.Ganjia Formation sedimentary this point,Permian closure,tectonic evolution from the deposition phase to denuded phase,Triassic this region again experienced tension effect,the end of the short fold orogenic,study area again into a sedimentary basin,by erosion phase to the deposition phase,formed in Longwuhe formation,Triassic advanced closed again,depositing complete end.Because after the formation since the Pleistocene due to the compression of the Indian plate continues to be affected,Formation of rotation occured in large-scale dextral strike-slip effect while also having a counter-clockwise motion,and resulting in the formation between Ganjia Formation "on top" phenomenon,the achievements of today's distribution pattern of sedimentary rocks.