吉林省桦甸市冰湖沟隐爆角砾岩型金矿床地质特征及找矿标志

Geological features and prospecting criteria of Binghugou cryptoexplosive breccia type gold deposit,Huadian City of Jilin Province

冰湖沟金矿床位于我国著名的夹皮沟金矿田南东缘,出露岩石主要为太古宙—显生宙高级变质的花岗岩类,其次是三道溜河TTG岩组、长英质片麻岩和变质表壳岩。冰湖沟金矿床赋存于二长花岗岩与NE向韧性剪切带NW向压性断裂控制的隐爆角砾岩筒中。金以金银矿和银金矿为主,呈显微粒状分布于石英、黄铁矿、褐铁矿等矿物颗粒中或晶面上。成矿期大致可分为内生热液期和表生氧化期,其中内生热液期为主成矿期。隐爆角砾岩为主要的找矿标志,硅化、黄铁矿化、褐铁矿化是主要的矿化蚀变标志。

Binghugou gold deposit is located in well-known Jiapigou gold-field SE fringe in our country, exposed rocks are principally Archean - Phanerozoic high metamorphic granitoid,and then are Sandaolliuhe TTG petrofabrics and felsic gneiss and metamorphic crustose. Binghugou gold deposit occurred in adamellite and cryptoexplosive breccia pipe controlled by NE ductile shear zone and NW compresional fault.Gold is mainly in gold-silver ores and silver-gold ores, showing micro granulate and distributing over quartz and pyrite and limonite mineral grains or crystal face. Metallogenic epoch is approximately divided into endogenous hydrothermal stage and supergene oxidation stage, among them, endogenous hydrothermal stage is the main ore – forming stage. Cryptoexplosive breccia is main prospecting criteria, silication, pyritization and limonitization are main mineralized alteration indicator.