江西广丰桃源自然铜类型铜矿化特征及找矿意义

Mineralization Characteristics and Ore-prospecting Significance of Native Copper-type in Taoyuan Deposit, Guangfeng County,Jiangxi Province

江-绍碰撞带上有多种类型铜矿化,其中产于新元古代陆相火山岩带中自然铜类型以江西广丰桃源矿床为代表,矿化产于粗安岩系岩石中,空间上与粗安玢岩多次隐爆形成的角砾岩带(筒)关系密切,伴有大面积的红色铁白云石化、赤铁矿化、硅化、绢云母化,自然铜产于铁白云石化带中,矿化以细脉、网脉为特征,出现自然铜、赤铜矿、黑铜矿、孔雀石矿石组合。

There are various copper mineralizations in Jiang-Shao collision zone, and Taoyuan deposit in Guangfeng is the representation of native copper-type deposits which oeeured in new proterozoic continental volcanic belt. Its mineralization happened in trachyandesite rock series. In space, it is closely related to breccia belts that were engenderred by the cryptoexplosions from andesitie porphyrites and associated with mineralization are large- scale red Fe-dolomitization, hematization, silicification and sericitization. Native copper occurrs in Fe-dolomitization belts and the characteristics of mineralization are cuprite veinlet and cuprite stockwork, and the mineral ores are native coppers, cuprites, tenorites and malachites.