鄂尔多斯盆地镇原地区下白垩统环河组砂岩铀矿元素地球化学特征及成矿探讨  

Geochemical characteristics and metallogenic exploration of uranium deposits in sandstones of Lower Cretaceous Huanhe Formation in Zhenyuan area, Ordos Basin

作　　者：毛宁 武正乾 刘坤鹏 于宏伟 王凯 王奇辉 MAO Ning;WU Zhengqian;LIU Kunpeng;YU Hongwei;WANG Kai;WANG Qihui(The 203 Institute of China Nuclear Geology,Xi’an,Shaanxi 710086,China)

机构地区：[1]核工业二〇三研究所,陕西西安710086

出　　处：《中国锰业》2022年第4期41-47,共7页China Manganese Industry

基　　金：中国核工业地质局地质勘查基金鄂尔多斯盆地镇原-盐池地区铀矿资源调查评价(编码202115-2)。

摘　　要：通过分析鄂尔多斯盆地西南缘镇原地区下白垩统环河组含铀砂岩的主、微量元素以及不同地球化学类型岩石环境指标特征,初步探讨了该区砂岩型铀成矿条件及成矿规律。研究结果表明,U与Th、Re、Mo、V元素呈现正相关关系,与Mo元素相关性较明显,可作为研究区环河组砂岩型铀矿富集的指示元素;根据岩石环境指标特征,灰黑色岩石发生了更强的还原蚀变;研究区砂岩型铀矿的形成与深部向上逸散的还原性油气流体作用关系密切,从而形成环河组大面积的铀异常。Based on the analysis of the main and trace elements of the lower Cretaceous Huanhe Formation uranium-bearing sandstones in Zhenyuan area, southwest margin of Ordos Basin, and the characteristics of rock environmental indexes of different geochemical types, the metallogenic conditions and metallogenic regularity of sandstone-type uranium in this area are periluminally discussed. The results show that U has a positive correlation with Th, Re, Mo and V elements, and a significant positive correlation with Mo element, which can be used as an indicator element for the enrichment of sandstone-type uranium deposits in the study area of Huanhe Formation. According to the characteristics of rock environment index, the gray-black rock has more strong reduction alteration. The formation of sandstone type uranium deposit in the study area is closely related to the deep upward escaping action of reducing oil and gas fluid, thus forming a large area of uranium anomaly in Huanhe Formation.

关 键 词：元素地球化学特征 油气流体 镇原地区 鄂尔多斯盆地西南缘 

分 类 号：P619.14[天文地球—矿床学]