1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Museum of Geology, Jilin University, Changchun 130026, China

The studies on LA-ICP-MS U-Pb geochronology of detrital zircons from sedimentary rocks within the Yingzuilazi Formation and Hekou member of Mantou Formation in the Yalu River Basin indicate that tuffaceous siltstone(sample HD1-3) collected from the Yingzuilazi Formatioin yielded ages ranging from 3 259 to 123 Ma, which can be subdivided into six age populations with peaks at 2 500(33%),1 807(11%),282(11%),235(5%),150(7%)and 126 Ma(5%).The group of youngest weighted mean age of 126 Ma indicates that the lower limit of the deposition age of Yingzuilazi Formation is Early Cretaceous. Its sedimentary provenances mainly source from the detrital material produced by Paleoproterozoic, Paleozoic and Mesozoic magmatism exposed in the sedimentary basin and adjacent area. Lithic feldspar sandstone(sample SD2-1)collected from the Hekou member of the Mantou Formation yielded ages ranging from 2 350 to 503 Ma, which can be subdivided into four age populations with peaks at 1 553(13%), 1 396(13%), 1 086(17%) and 787 Ma(30%). The youngest zircon age of 503 Ma indicates that the lower limit of the deposition age of Mantou Formation is Late Cambrain. Its sedimentary provenances mainly source from the detrital material produced by Mesoproterozoic and Neoproterozoic magmatism exposed in the sedimentary basin and adjacent area.