马鞍山任村铜矿成矿特征及找矿远景分析

Metallogenic Characteristics and Prospecting Prospect Analysis of Rencun Copper Mine in Ma’anshan

结合任村铜矿矿区地质工作现有成果,讨论了矿区及矿床地质特征、成矿模式,并进一步研究了矿床成因、控矿因素等,提出了区域内新的找矿远景区。该矿床属岩浆期后热液脉状铜矿床,矿体主要有3种赋存状态:一是赋存在大王山组二段安山岩层中的一组北北西向近于相互平行的节理裂隙带、破碎带中;二是产于正长斑岩与安山岩接触带附近安山岩、正长斑岩脉体内的节理裂隙带中;三是产于花岗岩与大王山组一段凝灰岩层接触带的凝灰岩层中;矿体受接触带、凝灰岩层内层间节理裂隙带、破碎带控制,一般呈脉状、透镜状、似层状产出。圈定了矿床北、北东侧铜山—大泉塘—吴村铜金异常作为找矿远景区,对于该区域下一步找矿勘查具有一定的指导意义。

Based on the existing results of geological work in Rencun Copper Mine,the geological characteristics and metallogenic model of the mining area and deposit are discussed,and the genesis and ore-controlling factors of the deposit are further studied,and a new prospecting area in the region is proposed. The deposit is a post-magmatic hydrothermal vein copper deposit,and the ore body mainly has three occurrence states. The first is a set of nearly parallel joint fissure zones and fracture zones in the north-north-west direction in the andesite layer of the second member of the Dawangshan Formation. The second is produced in the joint fissure zone of andesite and syenite porphyry vein near the contact zone between syenite porphyry and andesite. The third is produced in the tuff layer of the contact zone between the granite and the tuff layer of the Dawangshan Formation. The ore body is controlled by the contact zone,the interlayer joint fissure zone and the fracture zone in the tuff layer,which is generally veined,lenticular and layered. The Tongshan-Daquantang-Wucun copper-gold anomaly on the north and northeast side of the deposit is delineated as a prospecting area,which has certain guiding significance for the next prospecting and exploration in this area.