甘肃小金滩金矿床地质特征及控矿因素

Geological characteristics and ore-controlling factors in Xiaojintan gold deposit,Gansu Province

小金滩金矿床位于南秦岭多金属成矿带的谈家庄—广金坝印支—燕山期金锑汞成矿亚带内。在分析成矿环境的基础上,总结了矿床的地质特征,探讨了矿床的控矿因素。研究表明,金矿床受断裂带中主构造特定部位及次级构造控制,并与火山喷发作用、中酸性岩浆侵入以及深部成矿流体的多期次活动带来的多种热液蚀变的强烈叠加作用关系密切。

Xiaojintan gold deposit sits in Tanjiazhuang-Guangjinba Indosinian-Yanshanian Au-Sb-Hg subzone of South Qinling polymetallic metallogenic belt. The paper analyzed ore-forming background, summarized geological char- acteristics of the deposit and discussed the ore-controlling factors. Research shows that the gold deposit is controlled by a specific part in the main structure of the fracture belt and its secondary structure, and is closely related to the erup- tion of volcanoes, intrusion of medium acidic magmas and addictive effect of various hydrothermal alteration caused by the multi-phase activities of deep metallogenic fluids.