柴南缘甘森地区新近系狮子沟组铀矿化特征及铀矿成矿潜力分析OA

To investigate the stratigraphic characteristics and uranium mineralization potential of Neogene Shizigou Formation in Gansen area,southern margin of Qaidam Basin,this paper conducted a systematic research through sedimentary facies analysis,petrogeochemical testing,and observation of uranium mineralization features.The results showed that Shizigou Formation in Gansen area developed a braided river-braided river delta-lacustrine depositional system,and the discovered uranium mineralization was all distributed in the transitional zone between braided river plain facies and delta front facies.Petrogeochemical characteristics indicate that with increasing uranium content,SiO₂ content generally decreases,while CaO,Al₂O₃,TFe₂O₃,S²⁻,and V contents show an increasing trend.Rare earth elements exhibit typical characteristics of LREE enrichment,HREE depletion,and negative Eu anomaly.The uranium mineral is predominantly coffinite,whose formation is closely related to pyrite and carbonate cements.Provenance and weathering analysis suggested that the sandstones of Shizigou Formation were derived from felsic igneous source areas under warm and humid climatic conditions.The weathering products were rapidly deposited after short-to medium-distance transport,possibly mixed with some sedimentary recycled materials,and underwent moderate to relatively intense chemical weathering.Comprehensive analysis of uranium mineralization conditions indicates that Neogene Shizigou Formation in Gansen area has considerable uranium mineralization potential.Further prospecting work is expected to make a new breakthrough in uranium exploration in Qaidam Basin.