Rock geochemistry characteristics and geological significance of sandstone-type uranium deposits in Luhai area, Erlian Basin

LIU Xiaoxue; ZHAO Lijun; YU Reng'an; TANG Chao

2024 Vol. 47, No. 3

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LIU Xiaoxue, ZHAO Lijun, YU Reng'an, TANG Chao. 2024. Rock geochemistry characteristics and geological significance of sandstone-type uranium deposits in Luhai area, Erlian Basin. North China Geology, 47(3): 36-45.

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Rock geochemistry characteristics and geological significance of sandstone-type uranium deposits in Luhai area, Erlian Basin

Tianjin Center, China Geological Survey (North China Center of Geoscience Innovation ), Tianjin 300170, China

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Corresponding author: ZHAO Lijun

Received Date: 14 July 2023

Abstract

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.
- Erlian Basin /
- Saihantala Formation sandstone /
- geochemistry /
- material source /
- tectonic setting

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References

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