Sedimentary facies analysis of the Oligocene-Miocene Kangtuo Formation in Gerze Basin, Tibet

The Gerze basin located in the Qiangtang stratigraphic area of the Tibetan Plateau has been very insufficiently studied. According to the sedimentary characteristics of the Oligocene-Neogene Kangtuo Formation, three sedimentary facies have been recognized in the Gerze basin. i.e., fan delta facies, lacustrine delta facies and lacustrine facies. In combination with regional geological characteristics and paleocurrent analysis, the Oligocene-Neogene sedimentary evolution in the study area is divided into two stages, which in the chronological order are the initial rift-sagging stage and the steady depositional stage. The facies analysis of the Kangtuo section has obviously shed light on the understanding of the Oligocene-Neogene sedimentary evolution in the study area.