甘南地区杂恰勒布金矿地质特征及找矿标志

GEOLOGICAL CHARACTERISTICS AND PROSPECTING SIGNS OF ZAQIALEBU GOLD DEPOSIT IN GANNAN AREA, GANSU PROVINCE

杂恰勒布金矿隶属甘肃省夏河县拉卜楞镇管辖。大地构造位置属于中秦岭陆缘盆地,属崖湾—合作金锑成矿带扎油梁—枣子沟金成矿亚带。勘查区位于枣子沟超大型金矿床的西延地段,是甘南整装勘查区内新发现金矿。金矿赋存于下三叠统江里沟组,受NW向断裂带构造控制,与石英闪长玢岩密切相关,金矿体主要呈似层状、透镜状赋存于层间构造破碎带中,金矿主要蚀变为硅化、褐铁矿化、黄铁矿化、毒砂化、辉锑矿化等。通过区域对比,甘南地区金矿床赋矿地层主要以二叠系、三叠系为主,次为石炭系;区域性NW向断裂带及其次级断裂发育,金矿选择断裂破碎带或岩性界面富集成矿。主要找矿标志以中酸性小岩枝、岩脉及接触蚀变带;硅化、褐铁矿化、黄铁矿化、碳酸盐化蚀变发育地段,特别是土壤测量Au、As、Sb异常成为直接找矿标志。

The Zaqialebu gold deposit is located at the Bora Corrugated Town of Xiahe county, Gansu Province, which is in the Aiwan-Hezuo Au-Sb metallogenic belt and the tectonic position belonging to Middle- Qinling orogenic belt. The deposit is a new discovery of gold deposit in Gannan area located in the west extension lot of Zaozigou super large gold mine. The gold bodies are in the Jiangligou Group in the Early Triassic, extended by the NW fault zones, and related with quartz diorite. The gold ore body morphologies are main like layered and lens-shaped, with the staple alteration of silicidation, limonite mineralization, pyrite mineralization, venomized and brilliant mineralization. According to collect the regional data, the mining stratum of gold mines are Permian and Triassic in Gannan area with the NW fault zones and secondary fractures developing. Therefore, the gold enriched on the fault and lithological interface. The prime prospecting signs are middle and acid rock branches and veins. The direct prospecting signs are alteration area and geochemical anomalies of gold, arsenic and antimony.