瓜州钨铍多金属矿床矿体特征及成因浅析

瓜州钨铍多金属矿床位于甘肃省瓜州县境内,大地构造位于哈萨克斯坦板块马鬃山中间地块南缘与花牛山地体的接触带上。构造线以近东西向为主,断裂构造主要有近东西向、北西向、南北向。通过对本区矿床地质特征、矿体特征、矿石特征等的阐述及矿床成因的浅要分析,认为矿床属接触交代(矽卡岩)型。钨铍矿受背斜枢纽和平行于大断裂的次级断裂所控制,断裂带内节理裂隙发育处矿化增强,受背斜枢纽及断裂构造控制,钨铍矿化主要分布于背斜南翼的矽卡岩化大理岩和石英岩中,矿化对围岩具有选择性交代,围岩(碳酸盐岩)对成矿有利。

Characteristics and Genesis of Tungsten-Beryllium Polymetallic Ore Deposit in Guazhou County

Guazhou county tungsten-beryllium polymetallic ore deposit is located at Guazhou county of Gansu Province,its geotectonic located at contact strip of the south rim of Kazakhstan tectonic plate Mazongshan middle land massif and Huaniushan terrain.The lineation is mainly east-west trend,and the fault structure mainly north-south.Through analysis of ore deposit geological feature,the ore body characteristics,the ore characteristics and the ore deposit origin,it showed that the ore deposit is the contact metasomatism（skarns）.The tungsten-beryllium ores are controlled by the anticline hinge and secondary faults breaks in the big fault zone.Mmineralization strengthens where vein cracks developed in the fault zone.The tungsten mineralization is mainly distributed in marble and quartz rock south of the wing＇s skarns in anticline,which has selectively metasomatism to the wall rocks.Wall rocks are advantageous to the mineralization.