辽西贺吉沟金矿地质特征

Geological characters of Hejigou gold deposit in western Liaoning

在贺吉沟首次发现受燕山期隐爆角砾岩控制的金矿 ,主要产于呈港湾状分布的γ5内外接触带。按矿体产出位置可划分出地瓜梁、南山、北山、老沟口等几个矿段 ,每个矿段由一至几条矿体组成 ,但每个矿体规模较小。主要金属矿物为强烈破碎的黄铁矿 ,具强硅化、高岭土化等 ,以角砾状、细脉、浸染状矿石Au含量最高。成矿元素具有一定的水平和垂直分带 ,从矿体上部到下部呈现Au、Cu、Bi→Au、Mo、Ni、Co的分布特征。富矿段主要产于断裂在走向和倾向上的波状弯曲处以及NW与NE向断裂交汇部位。

A kind of cryptoexplosive breccias type gold deposits were firstly found in Hejigou area. The deposit located in the endo exocontact of magmatic rock of Yanshan cycle. The mining district could be divided into four ore blocks according to the location of ore bodies.Each ore block had one to several small ore bodies. High crashed pyrite that had been instensely silicated and kaolinizated is the major metallic mineral. Gold mainly enriched in breccias type, thread ve in type and impregenation type ore. Vertical zoning model of metallogentic eleme nt is Au Mo Ni Co in deep to Au Cu Ag Bi in shallow part. High grade ore block often located in winding part of fault in strike and dip or intersection part of faults of NW and NE strike.