Abstract: Changes of tectonic setting and climate are two important controlling factors for basin filling and evolution. They control the types and the distributions of the sediments. In the view of mineralogy and geochemistry of sediments, some dominating parameters are used to study the evolution of the basin tectonic setting and climate in the geological history, including δ¹³C and δ¹⁸O of carbonates, quartz/feldspar, kaolinite/clay and illite/clay. The low value of the quarter/feldspar occurred in Quan Ⅲ and Quan Ⅳ sequences indicates that there were tectonic activities happened at that time. The analyses of illite/clay and kaolinite/clay show that the climate had undergone the changes from aridity in the Quan Ⅲ period to humidity in the Qingshankou period, quickly to aridity in the Yaojia period, to humidity in the NenⅠperiod, and to hot humidity in the Nen Ⅲ and Ⅳ period during the Middle Cretaceous in Songliao Basin. The analysis of the stable isotope of carbon and oxygen from the carbonates shows that there was a transgression event at 83.3 Ma and a regression event at 82.8 Ma in Songliao Basin.

Key words: tectonic setting, paleoclimate, mineral, geochemistry, Songliao Basin