[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.
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