准噶尔盆地南缘楼庄子地区头屯河组水文地质条件与铀成矿的关系

前人在准噶尔盆地南缘楼庄子地区发现头屯河组砂岩型铀矿化,针对该地区铀成矿前景及找矿方向进行了论述,但铀控矿因素尚不明朗。砂岩型铀矿作为一种水成矿产,研究水文地质条件与铀成矿关系对铀成矿规律和找矿靶区的预测至关重要。本文利用铀矿勘探和煤田钻孔资料,分析了楼庄子地区头屯河组含水层特征并对其进行了划分;通过分析研究区地下水演化特征,推断出铀成矿地质时期;通过分析含水层发育特征（砂岩含水层厚度、沉积特征、砂泥比,连通性、渗透性等）、“天窗”特征,揭示了不同区域水循环交替强度、铀成矿水文地质条件的差异;综合有利成矿信息,预测头屯河组有利成矿的区域和含水层,经过钻孔验证,楼庄子地区中部铀矿化较好,东部次之,西部较差,仅Ⅲ含水层见工业铀矿化,取得了良好的勘探效果。

The relationship between hydrogeological conditions and uranium mineralization of the Toutunhe Formation in the Louzhuangzi area, southern margin of Junggar Basin

The sandstone-type uranium mineralization of the Toutunhe Formation was found in the Louzhuangzi area on the southern margin of the Junggar Basin. Although the metallogenic prospect and prospecting direction of uranium have been discussed previously, the ore-controlling factors of uranium are still unclear. Sandstone-type uranium deposit is a type of hydrogenetic mineral, and it is crucial to study the relationship between hydrogeological conditions and uranium mineralization for the discovery of uranium mineralization law and the prediction of prospecting target area. Based on the data of uranium and coalfield boreholes, the aquifers of Toutunhe Formation were divided and their characteristics were analyzed. According to the groundwater evolution characteristics in the survey region, the main uranium metallogenic geological period was deduced, Combined with the development characteristics of aquifers (thickness of sandstone aquifers, sedimentary characteristics, sand-mud ratio, connectivity, permeability, etc), as well as the characteristics of '' skylight '', this work revealed the differences of alternating intensity of hydrologic cycle and uranium metallogenic hydrogeological conditions in different regions. Favorable areas and aquifers of the Toutunhe Formation for uranium mineralization were predicted through comprehensive analysis of favorable metallogenic information. Drillings indicate that uranium mineralization is most promising in the central part of the Louzhuangzi area, followed by the eastern part, and least promising in the western part. Industrial uranium mineralization has only been observed in aquifer III, where excellent exploration results have been obtained.