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塔里木盆地喀什凹陷乌帕尔地段上新统阿图什组下段是砂岩型铀矿的主要赋矿层位，研究其沉积特征及铀成矿对指导该区砂岩型铀矿勘查工作至关重要。通过野外踏勘、岩心观察及钻孔资料综合分析，编制了该地段阿图什组下段地层厚度、砂体厚度等值线图等系列图件，并结合钻孔、地表露头揭露的氧化、矿化信息，综合分析了该地段阿图什组下段沉积相及成矿作用。结果表明：乌帕尔地段阿图什组下段砂岩类型主要为细-中粒长石砂岩-长石岩屑砂岩，含矿主岩内可见钒钾铀矿、角铅矿及黄铁矿；研究区主要发育冲积扇相与三角洲相沉积，其中冲积扇相可细分为扇中与扇根亚相；三角洲相可细分为三角洲平原分流河道、平原分流间洼地、前缘水下分流河道以及前缘分流间湾微相；其中三角洲平原分流河道与三角洲前缘水下分流河道的相变部位有利于铀成矿；铀矿化明显受层间氧化带与区域构造共同控制，总体经历初始铀富集、潜水转层间氧化、层间氧化带及铀矿化持续发育与差异化发育等阶段；研究区向斜北翼塔什达兰以西-约德尔-夏纳扎尔-膘尔阔依村以东南一带是铀成矿有利区域，可以作为阿图什组砂岩型铀矿下一步勘查的重点目标区。
Abstract：The lower member of the Upper Series Artux formation in the Wupaer area, Kashgar sag, Tarim basin, serves as the main host horizon for sandstone-type uranium deposits. Investigating its sedimentary characteristics and uranium mineralization is of great significance for guiding uranium exploration in this region. Based on comprehensive analysis of field reconnaissance, core observation, and borehole data, a series of maps including isopach maps of the lower Artux formation and sand body thickness were compiled. Combined with oxidation and mineralization information revealed by boreholes and surface outcrops, the sedimentary facies and mineralization processes of the lower Artux formation were systematically analyzed.The results indicate that the sandstones in the lower Artux formation of the Wupaer area are mainly fine-to medium-grained feldspathic sandstone and feldspathic lithic sandstone. The ore-bearing host rocks contain carnotite, phosgenite, and pyrite. The study area is primarily characterized by alluvial fan and deltaic deposits. The alluvial fan facies can be subdivided into middle fan and inner fan subfacies,while the deltaic facies can be subdivided into microfacies such as deltaic plain distributary channels, deltaic plain interdistributary depressions, deltaic front subaqueous distributary channels, and deltaic front interdistributary bays. The facies transition zones between the deltaic plain distributary channels and the deltaic front subaqueous distributary channels are favorable for uranium mineralization. The uranium mineralization is evidently controlled by the interlayer oxidation zone and regional tectonics. It generally experienced stages of initial uranium enrichment, phreatic-to-interlayer oxidation transition, continuous development of the interlayer oxidation zone and uranium mineralization, and differential development. The area extending from the west of Tashdalan to Yoder, Xianazar, and southeast of Biaoerkuoyi village on the north limb of the syncline in the study area is a favorable zone for uranium mineralization, and can serve as a key target area for the next phase of sandstone-type uranium exploration in the Artux formation.
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基本信息:
中图分类号:P619.14
引用信息:
[1]孙飞,王守玉,杨文龙,等.塔里木盆地喀什凹陷乌帕尔地段阿图什组下段沉积特征与铀成矿[J].世界核地质科学,2026,43(04):673-689.
基金信息:
中国核工业地质局铀矿地质项目“新疆塔里木盆地乌恰-尉犁地区铀矿资源调查评价与勘查”（编号：202207和202607-X）资助~~
2026-06-22
2026-06-22
2026-06-22