选择多龙矿集区美日切错组地层中的玄武岩-玄武安山岩-安山岩样品进行常量元素、稀土元素和痕量元素测试.通过分析,认为多不杂铜矿床碱性玄武岩形成于板内洋岛环境,钙碱性玄武岩类形成于大陆弧环境;拿若铜矿床安山岩形成于大陆弧环境;尕尔勤铜矿床钙碱性玄武岩形成于后碰撞弧环境.初步揭示出多龙矿集区板块俯冲作用引发地幔流体作用的成矿机制,地幔交代作用及其产物是洋岛玄武岩富集的主要原因,板块俯冲作用及其产物是岛弧玄武岩富集的主要原因.
The basalt, basaltic andesite and andesite samples in the Meiriqiecuo formation of the Duolong ore deposit area were selected for the determination of major elements, rare earth elements and trace elements.Through the analysis, that the Duobuza copper deposit of alkaline basalts formed in intraplate oceanic island environment, calc alkaline basalts formed in continental arc environment;the Naruo copper deposit of andesite formed in continental arc environment;the Gaerqin copper deposit of calc alkaline basalt formed in the post collision arc environment.Th is study reveals that the mineralization mechanism of Duolong ore district subduction caused by mantle fluid metasomatism, mantle metasomatism and its products is the main reason of ocean island basalt enrichment.In addition,subduction and its products is the main reason for the enrichment of island arc basalt.
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