河南八里桥金矿地质特征及成矿规律研究

Geological characteristics and metallogenic regularity of Baliqiao gold deposit,Henan Province

八里桥金矿区位于北秦岭造山带的北缘,处在栾川—维摩寺和乔端—瓦穴子断裂所夹持的中元古代褶皱带中,矿体产于次级构造秦老庄—苇园断裂的北侧。通过对区内地层、构造、花岗岩体的物质组分的分析,并结合金矿体产出特征、围岩蚀变特征,提出宽坪群是金矿体的"矿源层",与岩性、构造、岩浆活动等关系密切,确定了矿床类型为构造蚀变岩型金矿,从而为在该区域找寻同类型金矿提供借鉴。

The Baliqiao gold deposit is located at the Middle Proterozoic fold zone constrained by Luanchuan - Weimosi fracturc zone and Waxuezi - Qiaoduan fracture zone in the northern margin of Qinling orogenic belt. The gold ore bodies are located at the north side of the secondary Qinlaozhuang - Weiyuan fracture zone. Through the integrated analysis of strata, structures and the composition analysis of granite body,in combination of the characteristics gold ore bodies and wall rock alteration, the authors propose that the Kuanping group is the mineralization source layer. The formation of gold deposit is closely related to lithology, structure, magmatic activ- ity, and the gold deposit type is a structure - altered type which provide the referential experience to explore the same type of gold de-posit in the region.