云南广南地区老寨湾微细粒浸染型金矿床地质特征与成矿规律

老寨湾金矿区位于滇黔桂"西南金三角",是云南目前发现的最大的低品位微细粒浸染型金矿床。矿床产于加里东古隆起不整合面之上泥盆系下统蚀变细粒石英砂岩中,金矿是由沉积形成的含矿层经后期的构造运动、岩浆活动、淋滤作用等使含矿层中的Au进一步活化、迁移、富集而成的,构造、层位等控矿明显。蚀变是区内的找矿标志之一,金矿的形成与硅化、褐铁矿化、黄铁矿化等蚀变有关。金矿床的成矿与区域大地构造发展、深断裂发育、岩浆活动、成矿热液活动等密切相关。

Geological characteristics and metallogenic regularity of fine disseminated type gold deposit at Laozhaiwan in Guangnan area, Yunnan, China

Laozhaiwan gold deposit, which is currently the largest low-grade fine-granular disseminated type of gold deposits in Yunnan, is located in the junction of Yunnan-Guizhou-Guangxi region. The deposit occurred in altered fine quartz sandstones upon the unconformity of Caledonian ancient uplift. Undergoing the late tectonic activities, magmatism and eluviation, gold in the bearing bed developed gold deposit by the way of migration and enrichment. The development of gold deposit in this area is connected with alteration, such as silicification, ferritization, pyritization. Besides, its formation is also closely related to regional geotectonic development, deep and great rupture developing, magmatism, hydrothermal activity, etc.