湖南白竹坪金矿地质特征及找矿标志

Geological Characteristics and Prospecting Marks of Baizhuping Gold Deposit in Hunan Province

白竹坪金矿位于湘中白马山—龙山EW向穹窿构造带西段。矿床赋矿地层主要为高涧群天井组和震旦系江口群长滩组,目前已发现矿脉7条,严格受断裂破碎带控制。矿石中Au元素主要以自然金的形式存在,少量显微金以机械混入物或微包裹体形式赋存在黄铁矿、毒砂和黄铜矿等矿物中。围岩蚀变以硅化和黄铁矿化为主,其次为毒砂化、黄铜矿化、绿泥石化、绢云母化和粘土化等,常具有一定的分带现象。通过研究白竹坪金矿地质特征与矿体空间分布变化规律,提出了在白马山地区寻找类似金矿床的综合找矿标志。

Baizhuping gold deposit is located in the west of Baimashan-Longshan uplift belt in central Hunan Province.Ore formation of the deposits are Gaojian Group Tianjing Formation,Sinian Jiangkou Group Changtan set.7 ore-veins which strictly controlled by the fracture zone has been found in the deposit.Gold elements of gold ore mainly exists in the form of native gold.A small amount of microscopic gold in the form of machinery foreign substance or micro-inclusions existed in minerals such as pyrite,arsenopyrite and chalcopyrite.Wall rock alteration is given priority to with silicification,pyritization,times of arsenopyrite,chalcopyrite,chloritization,and sericitization,clay and so on.Wall rock alteration has the phenomenon of zoning.Based on the studies of Baizhuping gold mine geological characteristics,mineralization enrichment regularity of gold deposits,etc.,the ore-prospecting marks were summarized.