Rock geochemistry characteristics and geological significance of sandstone-type uranium deposits in Luhai area, Erlian Basin
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摘要: 【研究目的】二连盆地是中国北方典型的铀等多能源叠合富集的中新生代盆地。陆海铀矿作为该盆地近几年新发现的特大型铀矿产地，矿体具有埋藏浅、规模大、渗透性好等特点，通过研究矿石地球化学特征能够研究含铀地层的构造背景和物源区特征。【研究方法】选取陆海矿区4 个钻孔赛汉塔拉组上段非矿段含砾砂岩样品进行岩石学和主微量元素地球化学研究。【研究结果】赛汉塔拉组上段砂岩碎屑组分为石英含量（40%～75%），长石含量（20%～30%），显示了近物源搬运特征；岩石稀土元素以轻稀土元素富集，重稀土元素亏损，δEu表现为微负异常，主量、微量和稀土元素的构造背景判别图解综合表明赛汉塔拉组上段物源区为被动大陆边缘构造环境。【结论】结合区域构造演化，认为陆海矿区赋矿层赛汉塔拉组上段砂岩物源为巴音宝力格隆起和苏尼特隆起的岩体和火山岩地层。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.
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Key words:
- Erlian Basin /
- Saihantala Formation sandstone /
- geochemistry /
- material source /
- tectonic setting
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