| 唐国龙,黄笑,高天栋,余弘龙,刘庆,杨志亮.二连盆地乌里雅斯太凹陷赛汉组铀矿化特征及找矿前景探讨[J].矿产勘查,2024,15(5):756-766 |
| 二连盆地乌里雅斯太凹陷赛汉组铀矿化特征及找矿前景探讨 |
| Discussion on uranium mineralization characteristics and prospecting prospects of Saihan Formation in Erlian Basin Uriastai Sag |
| 投稿时间：2023-06-04 修订日期：2023-08-04 |
| DOI：10.20008/j.kckc.202405006 |
| 中文关键词: 砂岩型铀矿 成矿条件 找矿前景 赛汉组 乌里雅斯太凹陷 二连盆地 |
| 英文关键词: sandstone-type uranium deposits metallogenic conditions prospecting potential Saihan Formation Uriastai Sag Erlian Basin |
| 基金项目:本文受中国核工业地质局项目“松辽盆地通辽—大庆地区铀矿资源调查评价与勘查”（2022-12）资助。 |
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| 中文摘要: |
| 针对研究区内前期勘查工作铀矿成矿条件研究尚不深入的问题，为实现区内铀矿找矿突破，本文通过对乌里雅斯太凹陷的构造演化特征、蚀源区铀源条件、含矿目的层特征、水文地质条件、后生蚀变特征、铀矿化特征及白垩系沉积建造特征进行系统分析，结合研究区钻孔、连井剖面等资料，综合探讨了乌里雅斯太凹陷砂岩型铀成矿环境及条件，认为盆缘的富铀花岗岩体为沉积盆地提供了丰富的铀源，中生代后期构造反转形成的剥蚀天窗为含铀含氧水的渗入、渗出提供了通道，凹陷北缘陡坡带扇三角洲平原分流河道及前缘水下分支河道微相发育部位是该区砂岩型铀矿找矿的重点方向，下白垩统赛汉组为主要找矿目标层位，找矿类型以层间氧化带型为主，次为潜水氧化带型。研究区各种成矿要素匹配良好，具备形成中型以上的砂岩型铀成矿潜力。 |
| 英文摘要: |
| After several rounds of exploration in the research area， the metallogenic conditions of uranium deposits have not been systematically summarized. To achieve a breakthrough in uranium prospecting in the research area， the article systematically analyzes the structural evolution characteristics， uranium source conditions in erosion source area， ore-bearing horizon features， hydrogeological conditions， epigenetic alteration features， uranium mineralization characteristics， and Cretaceous sedimentary formation characteristics of the Wuliyasitai Sag. Combined with the drilling and well-connection profile data in the research area， the sandstone-type uranium metallogenic environment and conditions in the Wuliyasitai sag are comprehensively discussed. It is believed that the uranium-rich granite bodies at the edge of the basin provide abundant uranium sources for the sedimentary basin. The denudation skylight formed by the structural reversal in the late Mesozoic era provides a channel for the infiltration and exudation of uranium-bearing oxygenated water. The microfacies of fan delta plain distributary channels and frontal underwater branch channels on the steep slope zone in the northern margin of the sag are the key directions for sandstone-type uranium prospecting in this area. The Lower Cretaceous Saihan Formation is the main target horizon for prospecting， and the type of prospecting is mainly interlayer oxidation zone type， followed by phreatic oxidation zone type. The various metallogenic factors in the research area match well， and have the potential to form sandstone-type uranium deposits of medium and large sizes. |
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