新疆北部陆相火山岩型金矿床的主要特征

Features of continental volcanic rock-type gold deposits,northern Xinjiang

陆相火山岩型金矿目前是新疆最为重要也最富有特色和发展前景的金矿新类型。与金矿有关的火山岩 ,主要是一套以玄武岩 安山岩 流纹岩及其相应火山碎屑岩组合为特征的陆相火山岩。新疆北部存在两期 (华力西中期和中晚期—晚期 )陆相火山岩 ,相应发育两期金矿化。矿床地质和地球化学的一系列特征表明 ,该类金矿是与陆相火山岩密切相关 ,形成于岛弧或活动大陆边缘型挤压造山环境及近地表条件下的浅成低温热液金矿床。

The continental volcanic rock type gold deposits are the most important,particular and prospective new type of gold deposit in Xinjiang.Volcanic rocks related to the gold deposits are mainly composed of a series of basalt andesite rhyolite and relevent the pryoclastic rock assemblage.There are two stages of continental volcanic rocks (middle stage and middle late and late stage of Hualixi)and two corresponding stages of gold mineralization in the northern Xinjiang. The geology and geochemistry features of deposit show that this type of gold deposits belong to the epithermal gold deposits near the surface which are closly related to the continental volcanic rocks,form in island arc or active continental margin type conpressive orogenic setting.Diagenetic and mineralizing materials came from the upper mantle or the lower crust.