铜陵宝山陶铅锌金多金属矿区成矿规律及找矿前景

Metallogenic regularities and prospecting potentials of Baoshantao Pb-Zn-Au polymetallic orefield in Tongling City

通过对安徽铜陵宝山陶矿区成矿规律的分析,提出矿区的成矿母液主要来自燕山期的新屋里岩体后期分异。多次涌动的新屋里岩体在燕山晚期形成成矿热液,这些热液沿着该地区在印支期形成的层间滑脱断层和切割较深的北西向断层通道输送,在科里奥利力的作用下发生右偏,使得矿体多富集在层间滑脱断层和北西向断层交汇处,特别是北西向断层的右侧。矿液在运移过程中逐渐远离新屋里岩体,随着温度的下降,矿液发生分异,形成靠近岩体的宝山陶矽卡岩型铜矿,以及远离岩体的泉水冲、大竹园矿段铅锌铁矿。

By analyzing the metallogenic regularities of Baoshantao orefleld in Tongling of Anhui Province, it is proposed that its oreforming hydrotherm was from late differentiation of Xinwuli granitoids in Yanshanian Stage. Xinwuli granitoids became ore-forming hydrotherm in late Yanshanian Stage after many times of surging. The hydrotherm then flowed along the detachment fault between the layers in Indo-Chinese Epoch and a NW-trending deep-cut fault. Influenced by the Coriolis force, the hydrotherm diverted to the right, which caused the orebodies to gather at the intersection of the two faults, especially on the right of the NW-trending fault. The hydro- therm gradually left Xinwuli granitoids in transporting, differentiating with the lowering of temperature, and finally formed the Baoshantao skarn copper deposit near the granitoids, and the Pb-Zn-Fe deposits in Quanshuichong and Dazhuyuan ore districts away from the granitoids.