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位于江苏溧水盆地的观山铜铅金矿是典型的高硫型浅成低温热液矿床,但一直缺少精确的成矿年龄数据。对观山矿床近矿围岩绢云母化粗安斑岩中的2件绢云母样品进行40Ar/39Ar定年,得到的年龄分别为(120.8±1.0)Ma和(116.0±1.3)Ma,显示观山铜铅金矿形成于中国东部中生代大规模成矿作用时期。距今125Ma～115Ma,整个中国东部地区处于伸展背景下,发生了大规模的岩浆活动,并形成了包括溧水火山盆地在内的一系列的断陷盆地。溧水盆地在构造运动的强烈影响下,深部岩浆上涌,形成浅部岩浆房。在热动力的驱动下,富含成矿物质的岩浆水不断与大气降水混合,在近地表形成与粗安斑岩次火山岩有关的浅成低温热液铜多金属矿床。
The Gunshan Cu-Pb-Au deposit, located in Lishui Basin, Jiangsu Province, is a typical high-sulfur epithermal deposit, but accurate data on metallogenic age have been lacking. The 40Ar / 39Ar dating of two sericite samples in the sericite gabbro from the ore-bearing rocks in the Guanshan deposit were (120.8 ± 1.0) Ma and (116.0 ± 1.3) Ma, respectively, Copper-lead-gold deposits formed during the Mesozoic large-scale mineralization in eastern China. Since 125Ma ~ 115Ma, the whole of eastern China is under the background of stretching. Large-scale magmatic activities have taken place and a series of fault-depression basins including Lishui volcanic basin have been formed. Lishui Basin under the strong influence of tectonic movement, the deep magma uprush, the formation of shallow magma chamber. Driven by thermal power, the magmatic water rich in ore-forming materials is continuously mixed with the atmospheric precipitation to form epithermal copper polymetallic deposits in the near-surface associated with the coarse an- porphyry volcanic rocks.