吉林省和龙市百里坪银矿床成矿特征及成因探讨

Mineralization characteristics and genesis of Bailiping silver deposit in Helong City, Jilin Province

百里坪银矿床位华北东部陆块北缘,古洞河深大断裂的南西侧和龙地块内,二叠纪岩浆弧与中生代火山盆地群叠合部位,为银及多金属的重要成矿区。本文通过对矿床成矿地质条件、控矿因素、矿石物质成分、矿石类型、矿石矿物组合、蚀变类型、微量元素、稀土特征等方面的分析研究,总结了矿床成矿物质来源及成矿时代,探讨了矿床的成因及就位演化机制,指出该区多期次的构造岩浆活动对成矿起着重要作用,百里坪银矿床的成因为中低温岩浆热液型。

Located at the northern margin of the eastern North China Craton, Bailiping silver deposit, which is situated at the Southwest side of Gudonghe deep fault in Helong Block, superimposition part of both Permian magmatic arc and Mesozoic volcanic basin groups is an important metallogenic area of silver and polymetallic ore. Through the analysis and study of ore-forming geological conditions, ore-controlling factors, ore material composition, ore type, ore mineral assemblage, alteration types, trace elements, and rare earth elements features, the article investigated mineral deposit sources, metallogenic epoch, genesis and evolutionary mechanisms of the deposit. At the same time, the article also pointed out that the multiperiodic tectonic and magmatic activity played an important role in the process of ore forming. In the end, Bailiping silver deposit is the type of low to moderate temperature magmatic hydrothermal.