鄂尔多斯盆地泊江海子地区直罗组高分辨率层序地层研究  

Study on High Resolution Sequence Stratigraphy of Zhiluo Formation in Bojianghaizi Area,Ordos Basin

作　　者：王龙辉 胡立飞 杨胜富 郭涛 张海云 郭煦劼 WANG Longhui;HU Lifei;YANG Shengfu;GUO Tao;ZHANG Haiyun;GUO Xujie(Geological Party No.208,CNNC,Baotou,Inner Mongolia 014010,China)

机构地区：[1]核工业二〇八大队,内蒙古包头014010

出　　处：《铀矿地质》2021年第6期1057-1068,共12页Uranium Geology

基　　金：鄂尔多斯盆地北部铀矿资源调查评价与勘查项目(编号:201902)资助。

摘　　要：鄂尔多斯盆地泊江海子地区直罗组下段下亚段和上亚段均为含矿层位,而泊江海子地区该层位矿体较窄,矿体相对较为复杂,且矿体受小层序的控制较为明显,不同的小层序控制了本层序的岩石地球化学特征和含矿性,通过高分辨率层序地层的划分,能够对矿体进行更加精确的定位。文章利用高分辨率层序地层的思路,对目的层直罗组进行层序地层的精确划分,发现小层序反应的岩石地球化学特征和沉积相特征与矿体的富集部位具有很好的相关性,能够较好地反应成矿特征,矿体主要富集于小层序的氧化前锋线附近和氧化-还原叠置带内,富集于沉积相变化的附近。这种方法的应用虽然和大层划分成矿机制相似,但是具有很大的差异性,该方法的运用可以更加精确地定位矿层的富集部位,对于生产具有很好的指导性。The lower and upper members of Zhiluo Formation in Bojianghaizi area of Ordos Basin are both ore-bearing layers,while the ore bodies in this layer are relatively narrow and complex,and are obviously controlled by small sequences.Different small sequences control the geochemistry characteristics and ore bearing properties of the sequence,and the ore bodies can be more accurately located through the division of high-resolution sequence stratigraphy.The accurate division of the sequence stratigraphy of the Zhiluo Formation in the target strata showed that the characteristics of the geochemistry and sedimentary facies of the small sequence reaction have a good correlation with the enriched position of the ore body,and can reflect the metallogenic characteristics well,the ore bodies were mainly enriched near the oxidation front and the redox superimposed zone of the small sequence,and the change part of sedimentary facies.Although the application of this method is similar to the ore-forming mechanism of the stratigraphic division,it has significan difference,the application of this method can locate the enrichment position of ore bed more accurately,and has a good guidance for production.

关 键 词：高分辨率 层序地层 铀矿体 直罗组 鄂尔多斯盆地 泊江海子 

分 类 号：P539.2[天文地球—古生物学与地层学] P619.14[天文地球—地质学]