鄂尔多斯盆地西缘惠安堡铀矿成矿特征及控矿因素

Metallogenic Characteristics and Ore-controlling Factors of Huianbu Uranium Deposit in West Margin of Ordos Basin

为查明惠安堡铀矿床成矿特征及控矿因素,文章阐述了鄂尔多斯西缘构造特征,塑造了西缘褶断带以挤压和压扭为特征的基本构造形式,其后期为断裂、褶皱保持不变的差异抬升。应用地浸砂岩型铀成矿理论对研究区构造、含矿地层、层间氧化带、矿物特征进行分析,认为该地区砂岩型铀成矿特点为多种因素综合控制的结果,构造为主要控矿因素。构造控制目的层与地下水动力、层间氧化带及岩性岩相控制成矿部位、最后成矿与碳质、有机质、油气及热液改造有较大关系,为鄂尔多斯盆地西缘地浸砂岩型铀成矿研究提供了佐证。

In order to identify the metallogenic characteristics and ore-controlling facters.this paper expounds the tectonic characteristics of the west margin of Ordos basin and shapes a basic structural form characterized by extrusion and torsion for the fault-fold belt of western margin which later shows a differential uplift on condition that the fault and fold can remain unchanged.Applied the metallogenic theory of the in-situ leaching sandstone-type uranium.Analysis on the structure,lithology and lithofacies of ore-bearing stratum,characteristics of interlayer oxidation zone and the mineral composition characteristics,this paper argues that the uranium mineralization characteristics are influenced by multi-factors,which characteristics is main fact0r.Three main characteristics are as follows:1)The structure controls the prospecting target layer and the underground hydrodynamics;2)The interlayer oxidation zone and its lithology and lithofacies decides the metallogenic position;3)The carbon,organic material,oil gas and the hydrothermal solution can improve the mineralization.And an evidence is provided for the in-stiu leaching sandstone-type uranium in west margin of Ordos basin