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扬子西南缘康滇铜成矿带是我国重要的铁铜金矿产资源产区,分布许多小-大型铁氧化物-铜-金(IOCG)矿床,而本次研究的大红山矿床属康滇铜成矿带内最大的IOCG矿床之一。由石英脉中黄铜矿测年结果可以看出,Re-Os等时线年龄为1115±28 Ma,加权平均年龄为1113±14 Ma。因此,石英脉中黄铜矿矿化年龄为1115 Ma,结合扬子西南缘成岩成矿关系、背景研究,表明该黄铜矿为Grenvillian造山运动期碰撞后板内伸展环境产物。Re-Os同位素体系中高187Re/187Os比值、低含量的普通Os和高射性成因187Os的组成,指示成矿物质可能主要为壳源。
The Kangdian copper metallogenic belt in the southwest margin of Yangtze River is an important iron-copper-gold mineral resource producing area in China with many small-large iron oxide-copper-gold (IOCG) deposits. However, the Dahongshan deposit in this study belongs to Kang Dian One of the largest IOCG deposits in the copper metallogenic belt. According to the dating results of chalcopyrite in quartz vein, the Re-Os isochron age is 1115 ± 28 Ma and the weighted average age is 1113 ± 14 Ma. Therefore, the chalcopyrite mineralization age in quartz vein is 1115 Ma. Combined with the diagenetic and mineralization relationship and the background of the southwestern margin of the Yangtze River, the chalcopyrite is the product of the extensional environment within the Grenvillian orogeny after collision. The high 187Re / 187Os ratio in the Re-Os isotope system, the low abundance of common Os, and the high radiogenic 187Os composition indicate that the ore-forming material may be primarily a source of crust.