PALEOGENE AND NEOGENE PALEOCLIMATIC CHANGES IN THE TURPAN BASIN,NORTHWEST CHINA

The Paleogene and Neogene at the Lamjin section in the Turpan basin, Xinjiang, have a sedimentary thickness of~1779 m.This section is a good carrier for the study of the paleoclimate in this period in the basin.Major element geochemical analysis of the sediments in the section indicates the following:in the late Paleocene, the climate was warm and wet;in the late Eocene, it was also warm, but dry and wet alternately;in the Oligocene, it was warm and dry;in the Miocene, the climate was divided into two phases, being warm and wet in the early phase and cold and dry in the late phase;in the Pliocene, it was obviously dry.