秦岭地区首次发现含放射性成因异常铅的铜矿床

Copper deposit with high radioactive lead anomaly discovered first in Qinling area

具有高放射性异常铅的穆家庄铜矿床位于南秦岭造山带柞(水)山(阳)地区的泥盆系中。该矿床距柞水县城40余km,距西安100余km。矿体产于红岩寺-黑山复式向斜南翼金井河-胡家沟次级背斜南翼近轴部断裂中,赋矿岩石为泥盆系青石垭组中上部白云质岩,其空间展布明显受背斜的陡倾南翼(倒转翼)近轴部的层间断裂-裂隙带的控制,矿石构造主要为团块状和网脉状。铅同位素结果研究表明,穆家庄铜矿矿石铅和近矿围岩岩石铅具有富含放射性成因铅的特点。这是在秦岭地区首次发现的放射性成因铅——异常铅的铜矿床,它的发现具有很高的科学价值。

The Mujiazhuang copper deposit with high radioactive lead isotope compositions is located in Zhashan area of the South Qinling Orogenic Belt. The deposit is located 40 km away from Zhashui town and more than 100 km from Xi＇an. The orebodies occur in fracture near axial plane of Jinjinghe-hujiagou secondary anticline which is in the south limb of Hongyansi-heishan composite syncline. The host rock is dolomitic rock in middle to upper part of Qingshiya group in Devonian System, the special extension of which is controlled by inter layer fracture-fissure zone near the sharp south wing （inverted wing） of the anticline. Its ore types are massive or network. Lead isotope research shows that lead in ores of Mujiazhuang copper deposit and near ore country rocks is characterized by being rich in radioactive lead. It is a copper deposit rich in radioactive lead and anomaly lead to have been found in Qinling area. Its discovery is very important in many science researching fields.