山西省红土沟铅锌矿床地质特征及找矿潜力分析北大核心CSCD

山西省红土沟铅锌矿位于华北克拉通北缘集宁钼多金属矿田的南部。近年来该矿区发现多条中、小型铅锌矿体,矿体主要赋存在NE向、EW向与NW向断层控制的三角区内,且南部发育环状断裂与热液蚀变。为厘清红土沟铅锌矿床成因与找矿勘查方向,本文通过系统的野外地质调查、显微鉴定、地球物理与地球化学等方法,对区内矿床地质特征、矿物组合、蚀变特征、成矿规律与深部找矿潜力等进行综合分析,认为红土沟铅锌矿床属于与中生代次火山岩有关的热液脉型铅锌矿床。铅锌矿体与围岩片麻岩具有显著的物性差异,激电与大地电磁测量剖面均显示了深部存在高阻高极化的异常体,且ZK1601钻孔验证见到三层铅锌矿体。土壤地球化学测量显示了环状Pb-Zn多金属异常,结合地表的环状断裂与浅部的石英斑岩脉分布推测深部应存在隐伏成矿岩体,深部找矿潜力巨大且有可能发现大型斑岩型矿床。

Geological characteristics and prospecting potential of the Hongtugou Pb-Zn deposit in Shanxi Province

The Hongtugou Pb-Zn deposit is located in the south of Jining Mo polymetallic ore field in northern margin of the North China Craton. In recent years, many medium and small Pb-Zn orebodies have been discovered in this deposit, which are mainly hosted in a triangle area controlled by NE-, EW- and NW-striking faults, with ring faults and hydrothermal alteration developped in the south. In order to determine the genesis and prospecting direction of the Hongtugou lead-zinc deposit, this work analyzed the geological characteristics, mineral assemblages, alteration characteristics, metallogenic regularites and deep prospecting potential in the area through systematic field geological investigation, microscopic identification, and geophysical and geochemical methods. It is considered that Hongtugou lead-zinc deposit belongs to a hydrothermal vein type deposit related to the Mesozoic subvolcanic rocks. The Pb-Zn orebodies and wall-rock gneiss show significant physical differences. The IP and magnetotelluric profiles indicate the presence of some high-resistivity and high-polarization anomalies in the deep, and the drillhole ZK1601 penetrates three layers of Pb-Zn orebodies. Soil geochemical profiles identify a ring Pb-Zn polymetallic anomaly which is consistent with the ring faults and quartz porphyry dykes on the surface, indicative of a concealed pluton. It is inferred that there is a large prospecting potential in this area and a giant porphyry Mo deposit is expected to be discovered in the future.