河北三家金矿控矿条件及成矿规律分析

Analysis of ore-controlling conditions and metallogenic regularity of the Sanjia gold deposit in Hebei

青龙三家金矿主要产于太古宇迁西群三屯营组一段片麻岩中,矿脉严格受构造控制,矿石类型以含金石英脉型为主。金属矿物主要有黄铁矿和黄铜矿,矿脉的围岩主要为黑云角闪斜长片麻岩,局部为混合花岗片麻岩,富含铁、镁质,有利于金矿的沉淀与富集。矿化蚀变主要有硅化、黄铁矿化、钾化等。经过野外地质勘查,并结合前人资料对其控矿条件进行分析,认为三家金矿成矿热液以岩浆热液为主,成矿作用与中生代花岗岩密切相关,初步总结了该矿区金矿的成矿规律。

The Sanjia gold deposit occurs mainly in the gneiss of first member of Santunying system of Achaean Qianxi group, the gold lode is strictly controlled by the structure. The gold ore type is dominated by the gold - bearing vein. Main metal minerals are pyrite and chalcopyrite. Main country rock is biotite amphibole plagioclase gneiss, locally mixed by granitic gneiss which are rich in iron and magnesium which are favorable for the deposition and enrichment of the gold element. Main alteration includes silicification, pyritization and potassium etc.. Through the field geological observation in combination with previous geological data analysis, the ore - controlling conditions were discussed. The conclusion is that the hydrothermal fluid of Sanjia gold deposit is dominated with the magmatic fluid. The gold mineralization is closely related to Mesozoic granite intrusive. Finally the metallogenic regularity of the gold deposit area is summerized.