SEDIMENTARY FACIES AND TECTONIC EVOLUTION IN THE TONGZIYAN FORMATION OF THE LOWER PERMIAN IN THE SOUTHWEST OF FUJIAN PROVINCE

The Permian Tongziyan Formation in the southwest of Fujian Province can be divided into 3 members.There are 3 types of sedimentary facies:Liancheng,Longyan and Tianhushan.This formation is generally composed of coal-bearing clastic rock sediments of marine and continental facies,700-800 m thick,reducing from east,south to west,north.Having experienced tectonic evolution,magmatism and weathering degradation in the Indosinian and Yanshan epochs,part of the sedimentary basin of the Permian Tongziyan Formation is preserved.The Indosinian epoch has the largest influence,and the Yanshan epoch the second.