Analysis on the Ore-controlling Factors and Genesis of Uranium Mineralization in the Ridalik Area of the Kuqa Depression
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摘要:
塔里木盆地日达里克地区上新统库车组存在较大的砂岩型铀矿成矿潜力。笔者按照水成铀矿基本理论，充分运用和研究野外地质调查、钻孔资料和微观地球化学等第一手资料，系统总结了区内基本地质条件和铀矿化特征，重点分析了与铀成矿相关的岩性岩相、构造、还原介质以及层间氧化带含矿性等控矿要素，并对铀矿成因和成矿类型进行尝试性探讨，初步分析认为日达里克地区上新统库车组铀矿化与层间氧化带密切相关。
Abstract:The Pliocene Kuqa Formation in Ridalik area of Tarim Basin has a great potential for sandstone type uranium mineralization. According to the basic theory of hydrogenic uranium deposits, this paper makes full use of and studies the first-hand data such as field geological survey, borehole data and micro-geochemistry, systematically summarizes the basic geological conditions and characteristics of uranium mineralization in the area, focuses on the analysis of the ore-control factors related to uranium mineralization, such as lithology, lithofacies, structure, reducing medium and interlayer oxidation zone ore-bearing property, and makes a tentative discussion on the genesis and mineralization type of uranium deposits, The preliminary analysis shows that the uranium mineralization of the Pliocene Kuqa Formation is closely related to the interlayer oxidation zone.
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表 1 沥青铀矿化学成分的电子探针分析结果（%）
Table 1. EPMA analysis results of chemical composition of pitchblende （%）
样号 测点 K2O Na2O U ThO2 MgO CaO TiO2 Al2O3 TFe MnO SiO2 PbO 总量 备注 RD-1 ② − 0.204 70.29 − 0.087 0.181 0.973 4.48 1.533 0.084 9.645 − 87.472 沥青铀矿 注：1.样品测试在南京大学内生矿床成矿作用国家重点实騐室完成；仪器型号：日本JXA-8100（JEOL）；2.测试条件：20 kV，2×10−8 A；3.测点②位置见图6中沥青铀矿微粒。 
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表 2 日达里克地区库车组下段层间氧化带各地球化学分带中微量U、Th，C有、TS及Fe含量统计表
Table 2. contents of trace uranium, thorium, organic carbon, total sulfur and iron in each geochemical zoning of the interlayer oxidation zone in the lower member of Kuqa formation in Ridalik area
地化分带 U（10−6） Th（10−6） C有（%） S（%） Fe2+（%） Fe3+（%） Fe3+/Fe2+ Th/U 样品（个） 地表
露头2.91 5.30 0.335 0.130 1.02 1.28 1.33 2.51 71 氧化带 2.46 6.34 0.135 0.016 1.30 0.89 0.77 2.97 550 过渡带 126.72 6.05 0.238 0.261 1.42 1.09 0.80 0.34 420 原生带 6.22 5.77 0.158 0.046 1.36 0.71 0.57 0.97 126 注：样品由核工业地质分析测试研究中心测试。
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表 3 日达里克地区库车组下段价态铀分析统计表
Table 3. Statistical analysis of valence uranium in the lower section of Kuqa formation inRidalik area
样品编号 U+4（10−6） U+6（10−6） 合计（10−6） U+4/ U+6 UY4000-27 963 297 1260 3.24 UY4000-32 755 242 997 3.12 UY4000-33 52.6 28.7 81 1.83 UY2357-01 9.10 3.15 12 2.89 SY1623-1 227 27.8 255 8.17 注：样品由核工业地质分析测试研究中心测试。
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