陕南紫阳—平利地区碳硅泥岩型铀矿床成矿条件分析

Metallogenic conditions analysis of carbonaceous-siliceous-argillaceous type uranium deposits in Ziyang-Pingli region of south Shanxi

陕南紫阳—平利地区位于南秦岭碳硅泥岩型成矿带石泉—安康成矿集中区,铀成矿地质条件较为有利。已发现有碳硅泥岩型铀矿床(点)、矿化点及分布广泛的异常点。铀矿化受寒武系鲁家坪组(∈1l)、箭竹坝组(∈1j)和奥陶—志留系斑鸠关组((O3+S1)b)中碳硅泥岩地层控制。按含矿围岩将铀矿化分为3种类型,即含炭质硅岩型、石炭及炭质板岩型和煌斑岩脉型。褶皱构造和构造破碎带控制着铀矿化分布空间。

Located in Shiquan-Ankang metallogenic clusters of south Qinling metallogenic belt of carbonaceous-siliceous-argillaceous rock type mineralization, Ziyang-Pingli region of south Shanxi is of favorable uranium mineralization geological conditions. The carbonaceous-siliceous-argillaceous rock type uranium deposit （oecurenees）, mineralization points, abnormal points have been found in Ziyang-Pingli region, uranium mineralization is controlled by carbonaceous-siliceous-argillaceous formation of Cambrian Lujiaping Group（ ∈1l）, Jianzhuba Group （ ∈ l j） and Ordovician-Silurian system Banjiuguan Group （（O3＋S1）b）. According to the host rock, uranium mineralization is classified as three types： carbon-containing siliceous rocks, carboniferous and carbonaceous slate and lamprophyre vein type. Fold structure and tectonic fracture zone controlled the distribution of uranium mineralization space.