Abstract：Researches on paleogene of MengYin Basin were mainly concentrated in stratigraphic division and correlation, and few in a sedimentary environment. The sedimentary characteristics and environments of paleogene are studied using the methods of sedimentology and geochemistry. The results show that: ChangLu formation in Mengyin basin ( E12 + 3-E21ch) is developed with the fluvial and shore-shallow lacustrine facies, and Chang-1 member is mainly developed with fluvial deposits; member Chang-2 is with shore-shallow lacustrine facies with swamping coal-bearing clay deposits and Chang-3 member is with flooding lakeshore deposit. The geochemical indicators such as w ( V) / w ( V + Ni) , w ( Sr) / w ( Ba) , w ( Mg) / w ( Ca) show that the deposits of ChangLu formation was mainly under a humid climate and a freshwater environment, existing small fluctuations. There was a significant negative correlation between paleosalinity and water depth, as Mengyin basin was a closed intermountain basin during Paleogene. The Zhujiagou formation ( E21zh) belongs to the sediments of piedmont alluvial fan with orographic uplift after ChangLu period. The evolution of Mengyin basin during Paleogene was controlled by the dextral strike-slip of the Yishu fault and Lanliao fault, with the subduction of the Pacific plate.

Keyword：sedimentary environment;geochemical;Mengyin basin;Paleogene;