鄂尔多斯盆地宁东石槽村地区直罗组沉积体系与铀矿化关系  

Sedimentary system of the Zhiluo Formation and its relation with uranium mineralization in Shicao Village area of Ningdong Town,Ordos Basin

作　　者：芮婷 职荣军 王海波 周文生 窦志娟 马杰 赵德才 RUI Ting;ZHI Rongjun;WANG Haibo;ZHOU Wensheng;DOU Zhijuan;MA Jie;ZHAO Decai(Ningxia Nuclear Geological Survey Institute,Yinchuan 750021,Ningxia,China;Ningxia Institute of Geology and Mineral Survey,Yinchuan 750021,Ningxia,China)

机构地区：[1]宁夏回族自治区核地质调查院(宁夏回族自治区放射性地质研究所),宁夏银川750021 [2]宁夏回族自治区矿产地质调查院(自治区矿产地质研究所),宁夏银川750021

出　　处：《矿产与地质》2024年第3期483-491,共9页Mineral Resources and Geology

基　　金：宁夏自然科学基金项目(编号:2022AAC03656);宁夏青年科技人才托举工程(2022年)共同资助。

摘　　要：宁东石槽村地区位于鄂尔多斯盆地西缘断褶带马家滩地段,在直罗组地层中发现一定规模的铀矿化,其中工业矿体具有明显的层控特点。为探讨直罗组沉积体系与铀矿化关系,通过对直罗组地层进行岩石学、测井、沉积物粒度、孢粉化石研究,明确了石槽村地区直罗组沉积相及沉积体系。石槽村地区直罗组早期属于温暖潮湿的亚热带-温带型气候,有逐渐向干旱炎热的气候条件转变的趋势。直罗组为河流沉积体系,直罗组上段及下段上亚段时期为曲流河沉积,直罗组下段下亚段时期为辫状河沉积,铀矿化主要赋存于辫状河河道充填砂体中。Shicao Village area of Ningdong Town is located in the Majiatan section of the fault fold belt on the western edge of the Ordos Basin.A certain scale of uranium mineralization has been discovered in Zhiluo Formation,among which the industrial orebody has obvious stratigraphic characteristics.In order to discuss the relationship between the sedimentary system of Zhiluo Formation and uranium mineralization,the sedimentary facies and sedimentary system of Zhiluo Formation in Shicaocun area have been defined through the study of petrology,logging,sediment grain size and sporopollen fossils of Zhiluo Formation.The early stage of Zhiluo Formation in Shicao Village area belongs to a warm and humid subtropical temperate climate,with a gradual trend towards arid and hot climate condition.Zhiluo Formation is a fluvial sedimentary system.The upper segment and upper subsection of lower segment of Zhiluo Formation are meandering river sedimentary environment,and the lower subsection of lower segment of Zhiluo Formation is braided river sedimentary environment.Uranium mineralization mainly occurs in the braided river channel filling sand bodies.

关 键 词：沉积体系 沉积特征 铀矿化 古气候 直罗组 宁东石槽村地区 

分 类 号：P619.14[天文地球—矿床学]