甘肃大口子铜金矿床地质特征、控矿因素及找矿前景探讨

Geological Characteristics and Prospect of Ore Exploration in the Dakouzi Cu-Au Deposit,Gansu Province

甘肃大口子铜金矿床位于塔里木板块东北缘马鬃山古生代岩浆弧单元,是公婆泉加里东期-华力西期铜铁成矿带上新发现的矿床。通过对该矿床地质特征研究和物探化探异常综合分析,阐述了大口子铜金矿床的成矿特征、控矿因素和成矿前景。大口子铜金矿床具有东矿段以金矿化为主、西矿段以铜矿化为主的特征,其中铜矿化与区内早期岩浆活动关系显著,金矿化与构造-热液活动作用密切相关,显示不同期次叠加成矿的特征。孔雀石化是良好的地表找矿标志,构造控矿特征和岩体成矿专属性研究是下一步工作重点。

The newly found Dakouzi Cu-Au depositis is located in the in the Gongpoquan Caledonian-Hercynian copper and iron metallogenic belt,the Mazongshan Paleozoic magmatic arc of the northeastern Tarim plate.In this paper we analyze the geological characteristics and geophysical and geochemical anomalies of this deposit,and elucidate its mineralization rule,ore-controlling conditions and exploration prospect.In this place the Au mineralization occurred primarily in eastern section while Cu mineralization is dominant in the western section.Cu mineralization is closely related with early magmatic activity and Au mineralization was resulted from tectonic activity and hydrothermal alteration,which indicate that metallogeneses did not occur coevaly.Malachite mineralization on the surface is an important indicator for ore exploration.Besides,more attention should also be paid to the ore-controlling structure and metallogenic attributes of rocks in the future work.