湖南水口山老鸦巢金矿床地质特征及成因分析

Geological Characteristics and Genetic Analysis of Laoyachao Gold Deposit in Shuikoushan, Hunan Province

老鸦巢金矿床位于衡阳盆地南缘,水口山铅锌金银矿田的中部,属于隐爆角砾岩型金矿床。金矿体主要赋存于隐爆角砾岩系统及接触破碎带中,受构造、岩浆岩及地层联合控制。笔者基于金矿床的区域地质背景、矿床地质特征、微量元素特征、S−Pb−O同位素特征、成矿温压及盐度特征,以矿体特征、矿石特征、围岩蚀变和自然金成色特征为基础,结合分析成矿地质条件,厘定矿床成因类型为隐爆−中低温热液复成因金矿床。

Laoyachao gold deposit is located in the south margin of Hengyang basin and the middle part of Shuikoushan lead−zinc gold deposit.Gold ore bodies mainly occur in cryptoexplosive breccia system and contact fracture zone,which are controlled by structure,magmatic rock and stratum.Based on the regional geological background of gold deposits,ore deposit geological features,trace elements,S−Pb−O isotope characteristics,metallogenic temperature,pressure and salinity characteristics,orebody characteristics,ore characteristics,characteristics of wall rock alteration and assaying the fineness of native gold,as the basis,combining with the analysis of ore−forming geological conditions,deposit genetic type is determined as cryptoexplosion−liquid compound genesis of gold deposits(medium to low temperature).