Shenyang Center of Geological Survey, China Geological Survey, Shenyang 110034, China

Eighteen sandstone and mudstone samples collected from the Cretaceous Jiufotang Formation in Well Xiu D1 were analyzed for major elements and trace elements by means of X-ray fluorescence and IC-MS to investigate the paleoclimate, paleoenvironment and tectonic setting of the provenance. The characteristic values and ratios of elements B,Sr/Ba,B/Ga,U/Th,V/Cr,V/(V+Ni) and Cu/Zn indicate that Jiufotang Formation was deposited in fresh water and reducing environment, which was mainly open-lake. The geochemical indexes from Sr,Cu,Rb/Sr and Sr/Cu indicate that the paleoclimate was arid and there was once a fluctuating warming event with a low-high-low temperature trend in the period of Jiufotang Formation. The indexes of CIA and ICV show a relatively stable tectonic background for the provenance that underwent medium-strong chemical weathering.