安徽省池州市大石门铅锌矿地质特征及矿床成因

大石门铅锌矿是安徽省南部地区近年来新发现的、具有较高经济价值的中—低温岩浆热液型铅锌多金属硫化物矿床。矿体主要赋存于震旦系蓝田组上部的角岩化碳硅质板岩、大理岩化条带灰岩及灰质白云岩地层中,其次赋存于北东向构造破碎带中;矿体呈层状、透镜状产出,主要受北东向断裂构造、燕山期花岗闪长斑岩及蓝田组地层控制。矿区围岩蚀变类型主要包括黄铁矿化、硅化、绢英岩化和绿泥石化。本文在分析矿床具体特征的基础上对该矿的成因和控矿因素进行了研究,提出在研究区寻找此类矿床的几条建议。

Geological features and genesis of lead-zinc deposit in the Dashimen mining area, Chizhou City, Anhui Province

The Dashimen lead-zinc deposit is a newly discovered middle-low temperature magmatic hydrothermal lead-zinc polymetallic sulfide deposit with high economic value in the southern Anhui Province. The ore bodies in the deposit mainly occur in the hornfelsed carbonaceous-siliceous slates, marbleization banded limestone, and calcareous dolomite in the upper part of the Sinian Lantian Formation, and secondly in the NE-trending structural fractured zone. The ore bodies are layered and lenticular in shape, and are mainly controlled by the NE-trending fracture, Yanshanian granodiorite porphyry, and Lantian Formation. The main types of wall rock alteration are pyrite mineralization, silicification, sericitization, and chloritization. Based on the analysis of the specific characteristics of the deposit, this paper studies the genesis and ore-controlling factors of the deposit, and puts forward several suggestions for finding such deposits in the study area.