黑龙江省陡沟子金矿特征及成因分析

CHARACTERISTICS AND GENESIS OF THE DOUGOUZI GOLD DEPOSIT IN HEILONGJIANG PROVINCE

黑龙江陡沟子金矿位于小兴安岭西段,成矿带属于大兴安岭成矿带北段小兴安岭-张广才岭成矿带塔溪CuZn-Au-Mo成矿亚带。通过1：1万土壤地球化学测量工作,圈定了组合异常共圈定12处,其中16陡Ht-8号组合异常最具找矿意义。经过异常查证,初步圈定金工业品位矿体＋低品位矿体宽度为19m,平均品位2.75g/t。对区内土壤地球化学及构造特征认为,该金矿（1）具有较好的金矿原生晕,附近土壤样品中Au和Ag元素,Pb和Zn元素,W和Mo、Bi元素异常套合较好,元素异常分带性较明显,金、银矿伴生以金矿为主,具有深部找矿意义;（2）区域上的格根敖包组变火山岩非成矿系统,矿体受近EW向断裂控制,断裂带附近的糜棱岩化流纹岩充当了容矿体,具有受早白垩期构造活动控制,形成于早白垩期的低温热液型成因;（3）矿体外围西部格根敖包组与侵入岩北东东向断裂构造接触带附近也具金矿找矿潜力。

The Dougouzi gold deposit in western Heilongjiang is located in the western part of the Xiaoxing＇anling metaUogenic belt, which belongs to the Cu-Zn-Au-Mo metaUogenic sub-zone of the Taxi in the Xiaoxing＇anling- Zhangguangcailing metallogenic belt in the north of the Daxing＇anling metallogenic belt. Through the 1： 1 000 soil geochemical survey work, 12 anomalies are delineated, of which 16 steep Ht-8 combination anomalies are the most prospecting significance. After the anomaly verification, the initial dehneation of gold grade grade ore body ore body width of 19m, the average grade 2.75g / t. The geochemical and tectonic characteristics of the soils suggest that the gold deposits （1） have good gold halo, and the Au, Ag, Pb, Zn, W, Mo and Bi anomalies in the soil samples （2） The Gergen-Aobao-group variable volcanic non- metaUogenic system in the area, and the ore bodies are controlled by the near-EW-to-EW direction, and the ore-bodies are closely associated with gold deposits. Fauh control, and mylonitic rhyolites near the fauh zone acted as ore-hosting bodies with low-temperature hydrothermal genesis controlled by early Cretaceous tectonic activity and formed in the Early Cretaceous; （3） The potential of gold deposits is also found near the contact zone between the Aobao Formation and the NE- trending fault structure of the intrusive rocks.