辽宁东平金矿床地质特征及找矿方向

东平金矿位于辽西凌源-阜新金成矿带上,金矿(化)体主要赋存在硅化构造角砾岩、硅化流纹岩和硅化流纹质角砾熔岩中.矿石以自然金和银金矿为主,其中自然金约占80%,银金矿约占20%.激电中梯及钻探结果显示矿体主要受北北西向构造控制,金矿(化)体主要位于高阻低极化率的F2构造蚀变带内.土壤地球化学测量圈定综合异常22处,Ⅰ-4异常区经钻探验证发现多个隐伏金矿(化)体.在详细研究矿床地质特征的基础上,通过对比邻区赵家沟金矿,初步推断其成因类型为低温热液型金矿.同时认为区内北北西向构造蚀变带内具有的黄铁矿化、强硅化和碳酸盐化是主要的矿化蚀变信息,高阻低极化率及Au土壤地球化学综合异常带是重要的找矿方向.

GEOLOGICAL CHARACTERISTICS AND PROSPECTING DIRECTIONS OF DONGPING GOLD DEPOSIT IN LIAONING PROVINCE

The Dongping gold deposit is located in the Lingyuan-Fuxin gold metallogenic belt of western Liaoning Province, with gold ore/mineralized bodies mainly occurred in the silicified tectonic breccia, silicified rhyolite and silicified rhyolitic breccia lava. The ores are dominated by native gold and electrum, among which the former accounts for 80% and the latter 20%. The IP intermediate gradient and drilling results show that the ore bodies are mainly controlled by the NNW-trending structure with the gold ore/mineralized bodies constrained in the F2 structure altered zone of high resistance-low polarizability. By soil geochemical survey, 22 comprehensive anomalies are delineated and several concealed gold ore/mineralized bodies are found in the I-4 anomaly area by drilling verification. Based on a detailed study of the geological characteristics, through comparison with the adjacent Zhaojiagou gold deposit, the preliminary conclusion is that the Dongping gold deposit is genetically epithermal type. It is also believed that the pyritization, strong silicification and carbonatization in the NNW-trending structure altered zone are significant mineralization and alteration, and the high resistance-low polarizability and Au soil geochemical comprehensive anomaly zone are key prospecting directions.