河北省丰宁县牛圈子银金矿床地质特征及控矿因素

牛圈子银金矿区位于上黄旗岩浆岩亚带的西侧。在系统资料收集和二次分析的基础上,通过开展野外实地工作,系统地总结区内深部主要铅锌银多金属矿床地质特征,分析岩浆岩及构造对区内铅锌银多金属矿成矿的控制,以及探讨矿床成因类型。研究表明,本区银金矿体、铅锌多金属矿体主要赋存于沿F 1断裂破碎带贯入的隐爆角砾岩体及其上下盘的蚀变碎裂花岗岩中,NE向F 1断裂带及其控制的隐爆角砾岩是主要的控矿因素,成矿流体属深源混合岩浆水,矿床成因类型属于中低温热液矿床。研究结果可为本区及外围进一步开展地质找矿工作提供参考。

Geological characteristics and ore-controlling factors of Niuquanzi silver-gold deposit in Fengning County,Hebei

The Niujuanzi silver-gold deposit is located in the west of Shanghuangqi magmatic subzone.On the basis of systematic data collection and comprehensive analysis,and the field work,the paper has systematically summarized the geological characteristics of the lead-zinc-silver polymetallic deposit in the deep area,and has analyzed the controlling influence of magmatic rocks and structures on the formation of lead-zinc-silver polymetallic deposit,the deposit genesis is also discussed.The study result has shown that the silver-gold ore bodies and lead-zinc polymetallic ore bodies in this area are mainly hosted in the cryptoexplosive breccia body penetrating along F 1 fault zone and the altered and fragmented granite in the upper and lower walls.F 1 fault zone of NE direction and the cryptoexplosive breccia are the main ore-controlling factors.The ore-forming fluid is the deep mixed magmatic water,and the deposit genesis type belongs to the medium-low temperature hydrothermal deposit.The research result can provide a reference for the geological prospecting work in the future in this area and its periphery.