青海果洛龙洼金矿床同位素特征及成因

Isotope Characteristic and Ore Genesis of Guoluolongwa Gold Deposit in Qinghai Province

果洛龙洼金矿产于东昆仑造山带万保沟群韧性剪切带中,矿化围岩为绿泥石千枚岩和硅质板岩等,各种脉岩较发育。矿化类型有石英脉型、蚀变千枚岩型、构造破碎带型和脉岩型等。矿石矿物组成简单,属少硫化物型。硫、铅同位素组成表明,果洛龙洼金矿床与东昆仑成矿区大多数金矿床相似,属于比较典型的造山带型金矿,是一个与华力西—印支期中酸性岩浆活动有关的中温热液型金矿床。

Guoluolongwa gold deposit is located Wangbaogou Group of the east Kunlun orogenetic belt.It is controlled by a ductile shear zone.Mineralized rocks are chlorite phyllite,siliceous slate,and so on.There are plenty of vein rocks in the metallogenic region.Mineralize type includes quartz vein,altered phyllite,fracture zone,vein-like mass.The ore is low content of sulfide,mineral composition is simple in the ores.The study results of sulphur and lead isotopes show that Guoluolongwa gold deposit is very like the others gold deposit of the east Kunlun minerogenetic region.It is a typical type of orogenic gold deposit.It is related to intermediate-acid magma intruded in Varisian-Indian-China periods and it belongs to medium-temperature hydrothermal type.