舟曲羊里尾沟金矿地质矿化特征及找矿标志

GEOLOGICAL MINERALIZATION AND PROSPECTING INDICATIONS OF YANGLIWEIGOU GOLD DEPOSIT IN ZHOUQU

羊里尾沟金矿是2007~2014年以来在迭部—武都砷汞锑金多金属成矿带上发现评价的一处中型金矿床。矿体主要赋存于下石炭统炭（硅）质板岩,局部赋存于炭（硅）质板岩夹灰岩,两组NW向断裂控制金矿带及矿体的产出,主矿体局部表现为厚度大、品位较富、倾向延伸80m左右、赋矿岩性以炭质板岩为主的大透镜体。金属矿物以黄铁矿为主,次为毒砂、辉锑矿,金矿物为自然金、银金矿,属粒径大部分在0.01~0.037mm之间的微细粒金。下石炭统炭质板岩,NW向断裂破碎带,硅化、黄铁矿化、毒砂化、碳酸盐化围岩蚀变,Au、As、Hg、Sb、W地球化学组合异常等是矿区的主要找矿标志。

Yangliweigou gold deposit is located in Diebu-Wudu As-Hg-Sb-Au polymetallic metallogenic belt which was found and evaluated as a medium sized gold deposit since 2007 to 2014. Ore bodies mainly occurred in Lower Carboniferous carbonaceous（siliceous） slate, part of it occurred in carbonaceous（siliceous）slate with limestone. The two group faults of NW direction control the occurrence of gold ore belt and ore bodies.The main ore body output in NWW direction fault belt as a big lenticle and characterized by great thickness, high grade, the dip extending about 80 m and the host rock of carbonaceous slate. The main metallic mineral is iron,arsenopyrite and stibnite are secondary. Gold minerals are native gold and electrum, the grain size are mostly ranged between 0.01 and 0.037 mm. The prospecting indicators of mine area are. the Lower Carboniferous carbonaceous slate, NW direction fault fracture zone, the wall rock alteration of siliconization, pyritization,arsenopyritization, carbonatation and geochemical assemblage anomalies of Au, As, Hg, Sb and W.