新疆且末县布拉克铜矿床控矿特征研究

Study on Ore-controlling Characteristics of Bulake Copper Deposit in Qiemo County in Xinjiang Uygur Autonomous Region

新疆且末县布拉克铜矿位于吐拉盆地西南缘,矿体呈层状产出于白垩纪红色碎屑岩建造内的浅色砂砾岩层中;矿石由石英、长石等矿物晶屑和安山岩、玄武岩、流纹岩等岩石碎屑及孔雀石、褐铁矿等金属矿物填隙物及碳酸盐、泥质物等胶结物组成。吐拉断陷盆地西南缘白垩系砂砾岩层广布,该矿床的发现及其控矿特征的研究对该地区的地质找矿具有指导意义。文章通过总结矿床地质特征,结合吐拉盆地的演化究其来龙去脉,建立成矿模式。综合分析认为,矿床成矿受岩相、古地理、岩性、大地构造控制,成矿物质来源于剥蚀区古老铜矿床。继此进一步指出了砂砾岩型铜矿的找矿方向。

Bulake copper deposit in Qiemo county in Xinjiang is located in the southwest edge of Tula basin.The ore body occurs as layered form in the light-colored glutenite beds in Cretaceous red clastic rock formation.The ore is composed of mineral crystal fragments of quartz and feldspar,rock fragments of andesite,basalt and rhyolite,metallic interstitial materials of malachite and imonite,and cements of carbonate and mud.The Cretaceous glutenite beds are widely distributed in the southwest margin of Tula basin.The discovery and study of the ore-forming characteristics of the deposit are of guiding significance to the geological prospecting in this area.By summarizing geological characteristics of the deposit,combining with the evolution of Tula basin,metallogenic model has been established.According to comprehensive analysis,the mineralization of the deposit is controlled by lithofacies,palaeogeography,lithology and geotectonics.The ore-forming material comes from the ancient copper deposits in the denudation area.The prospecting direction of sandstone-conglomerate type copper deposit is further pointed out.