激发极化法在下庄铀矿田的应用研究——以竹山下铀矿床为例

下庄矿田是我国花岗岩型铀矿资源的重要产地,铀矿化主要赋存于构造(硅化)破碎带及两侧蚀变花岗岩中且与黄铁矿等金属硫化物关系密切。物性标本测试显示构造蚀变岩石普遍呈低阻、高极化,而正常岩石则呈高阻、低极化,具有显著的物性差异利于激发极化法的开展。通过对已知矿床的激发极化法勘查试验,证实利用激发极化法寻找构造蚀变带型铀矿是有效的。结合区域铀成矿特征及方法有效性试验结果,初步建立了“低阻、高极化”构造蚀变带找矿模式及“高阻、相对高极化”的红、黑色微晶石英脉型找矿模式。

Application of Induced Polarization Methods in Xiazhuang Uranium Ore Field,A Case Study of Zhu Shanxia Uranium Deposit

Xiazhuang ore field is an important production area of the granite-type uranium resource in China.Uranium mineralization mainly occurs in structural(silicified)fracture zones and altered granites on both sides,and is closely related to metal sulfides such as pyrite.Physical properties test shows that structural altered rocks are generally low resistivity and high polarization,while normal rocks are high resistivity and low polarization,with significant differences in physical properties that are conducive to the application of induced polarization.It is proved that using the induced polarization method to search for structural alteration zone type uranium mineralization is effective by the investigation of the known ore deposits.Combined with the regional uranium metallogenic characteristics and the test results of the validity of the method,the prospecting model of"low resistivity and high polarization"structural alteration zone and"high resistivity and relatively high polarization"red and black microcrystalline quartz vein type are preliminarily established.