Abstract:For the northeast songliao basin sandstone type uranium deposit prospecting work,The provenance of uranium - bearing sand body is its key factor, Quantou formation is one of the important purpose of ore layer, identify the petrological and geochemical characteristics of the prospecting in northern songliao basin is of great significance, Through the petrology studytrace elements and rare earth elements of the Quantou formation in this study area ,its known that quantou formation clastic rocks are mainly composed of feldspathic lithic sandstone, the clastic rock compositional maturity and textural maturity are low, with nearly the sedimentary characteristics of the source,which are characterized by relatived poor total REE contents(ΣREE=103.80×10?6~194.31×10?6), significant fractionation of HREE and REE[(La /Yb)]N =3.57~4.12 and moderate Eu negative anomalies(δEu=0.57~0.96)The rhyolites are enriched Rb,Th, U, K and LREE, and strong loss of Ba, Sr and HFSE (e.g., Nb, Ta, P and Ti), relative loss of Nb, Ta.Moreover, it falls into the source area and the active continental margin area respectively in the source area and the structural discriminant diagram, indicating that the sedimentary environment of the mother rocks of the quantou formation is a sedimentary basin related to the active continental margin.