Abstract: This paper is the result of the sandstone-type uranium deposits.Objective The Erlian Basin, a quintessential Mesozoic-Cenozoic basin in northern China, is renowned for its superimposed and enriched deposits of uranium and other energy resources.The Lu-hai uranium deposit, a recently discovered super-large deposit within the basin, is distinguished by its shallow burial depth, extensive scale, and favorable permeability.Investigating the geochemical characteristics of the ore can elucidate the structure and provenance of the uranium-bearing stratay.Methods This study examines the petrography and trace element geochemistry of conglomeratic sandstone samples from the non-ore-bearing member of the Upper Saihantala Formation, extracted from four boreholes in the Lu-hai deposit.Results The sandstone's detrital composition in the upper member of the Saihantala Formation predominantly consists of quartz (40% to 75%) and feldspar (20%to 30%), indicative of proximal source transportation.The rare earth elements (REEs) exhibit a light REE enrichment and heavy REE depletion, with a slightly negative europium anomaly (δEU).The discrimination diagram of major, minor and rare earth elements suggests that the Upper Saihantala Formation's provenance is associated with a passive continental margin tectonic settingt.Conclusions Based on the regional tectonic evolution, the sandstones of the Upper Saihantala Formation in the Lu-hai mining area are inferred to be sourced from the Bayanbaolige Uplift and Sunite Uplift's rock mass and volcanic strata.