Uranium source analysis and its geological significance to Uranium metallogenic evolution in Dongsheng Uranium Ore Field
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摘要:
笔者以鄂尔多斯盆地东胜铀矿田的典型矿床——纳岭沟铀矿床为主要研究对象，通过铀矿体及围岩岩石地球化学、电子探针及稳定同位素测试等方法，综合分析了东胜砂岩型铀矿田的铀源及其地质意义。结果表明：主要含矿目标层中侏罗统直罗组在同生沉积过程中，铀预富集达212.45×10-6，围岩达41.34×10-6；预富集铀主要来自于盆地北缘蚀源区；铀矿体及围岩REE配分曲线总体具一致性，右倾，个别δEu正异常，富集重稀土，两者铀源具一致性；含铀砂岩δ13CV-PDB=-9.7‰，δ18OSMOW=18.9‰，黄铁矿δ34Sv-CDT=-27.46‰，经历了强烈的有机地质作用；铀石围绕炭屑、星散状黄铁矿产出，被胶状黄铁矿肢解，铀富集于成岩作用后期。由此认为，直罗组同生沉积过程中预富集的铀为主要成矿铀源，东胜铀矿田属直罗组预富铀重新分配的产物。
Abstract:In order to study the uranium source and its geological significance of the Dongsheng uranium orefield, the geochemistry, electron probe and stable isotopes of ore body and country rock from the Nalingou uranium deposit are selected. The results indicate that the original uranium content of orebody and mudstone is separately 212.45×10-6 and 41.34×10-6, showing strong preenrichment in the process of syngenetic sedimentation. The debris mainly comes from the adjacent Yinshan Precambrian basement, a few from late Paleozoic acid magmatic rocks, and the uranium in the process of pre-enrichment are mainly from the erosion source area of the northern basin. The REE distribution patterns of the uranium ore body and country rock is generally the same, with individual δEu positive anomaly, enrichment of LREE, and the same source of uranium. The δ13CV-PDB and δ18OSMOW values of the ore bodies are -9.7‰ and 18.9‰ respectively, and the δ34Sv-CDT value of pyrite is -27.46‰, indicating that they experienced a strong organic geological process. Coffinite occur around the charcoal and scattered pyrite, and were cut through by colloidal pyrite. Uranium is enriched after diagenesis. It is believed that the pre-enrichment of uranium in the process of syngenetic sedimentation is the direct and importont source of uranium mineralization, and Dongsheng uranium ore field is the product of diagenesis of Zhiluo Formation.
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表 1 纳岭沟铀矿床含矿层及围岩铀含量及铀迁移率
Table 1. Uranium content and mobility of uranium ore and country rock from Nalinggou deposit
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表 2 铀矿体及围岩黄铁矿34S同位素特征
Table 2. S isotope characteristics of pyrite from uranium orebody and country rock
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表 3 含矿砂岩及围岩C-O同位素特征
Table 3. C-O isotope characteristic of ore-bearing sandstone and country rock
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表 4 含矿砂岩及围岩REE含量（10-6）特征
Table 4. REE characteristic of ore−bearing sandstone and country rock
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