陕西铧厂沟金矿床地质特征及成矿规律

Geological Characteristics and Metallogenic Regularity of Huachanggou Gold Deposit,Shaanxi Province

铧厂沟金矿床位于秦岭褶皱系南部,北距康县—略阳—勉县深大断裂4 km。金矿化严格受地层、岩性及韧性剪切带控制,主要控矿层位为蚀变细碧岩及灰岩与粉砂质千枚岩之间的过渡部位,控矿构造多为压扭性断裂。金矿体呈脉状和透镜状产出,矿化带类型以蚀变细碧岩型及蚀变碳酸盐岩型为主,黄铁矿是矿石中最主要的载金矿物。矿石中金的赋存状态主要为包裹金和裂隙金,粒间金次之,围岩蚀变主要有黄铁矿化、硅化、碳酸盐化、钠长石化和绢云母化等。黄铁矿热电系数和原生晕地球化学研究显示,本区金矿体向深部有一定的延伸,应重点加强细碧岩型矿带和砂岩矿带的地质找矿与探矿工作。

The Huachanggou gold deposit is located in the south of the Qinling Mountain fold system,4 km north of Kangxian-Lueyang-Mianxian deep fault.The gold mineralization zone is controlled strictly by strata,lithology and ductile shear zone.Altered spilite and the transition parts between limestone and silty phyllite are the main ore-controlling strata.Compression shear fracture is the main ore-controlling structure.The gold orebody is occmTed as veins and lenticle.Altered spilite and altered carbonatite are the main mineralized types.Pyrite is the main gold- carrying mineral.Occurrence of natural gold in the ore is observed included-gold and fissure-filled gold,the secondary type is intergranular gold.Wall-rock alternation are mainly pyrite, silicification, carbonatization, albitization, sericitization,etc.By studying the pyroelectric coefficient and primary halo of pyrite studies,the result shows that the gold ore body is extending to the deep part.It is advisable to strengthen the work of geological prospecting and ore exploitation between spilite ore belt and sandstone ore belt.