CAJ | 학술논문

为了精确厘定莲花山铜矿的成矿时代，在前人研究的基础上，开展了与成矿关系密切的花岗闪长斑岩锆石U-Pb定年测定。实验结果共获得4组年龄数据，第1组有1个锆石，206Pb/238U年龄为343Ma±2Ma；第2组1个锆石，206Pb/238U年龄为264Ma±2Ma；第3组有1个锆石，206Pb/238U年龄为256Ma±2Ma；第4组有17个锆石，206Pb/238U年龄在240～249Ma之间，206Pb/238U年龄加权平均值为246.4Ma±1.2Ma（N=17）。结合所测锆石的CL图像特征，确定花岗闪长斑岩就位发生在晚二叠世-早三叠世。
위료정학전정연화산동광적성광시대，재전인연구적기출상，개전료여성광관계밀절적화강섬장반암고석U-Pb정년측정。실험결과공획득4조년령수거，제1조유1개고석，206Pb/238U년령위343Ma±2Ma；제2조1개고석，206Pb/238U년령위264Ma±2Ma；제3조유1개고석，206Pb/238U년령위256Ma±2Ma；제4조유17개고석，206Pb/238U년령재240～249Ma지간，206Pb/238U년령가권평균치위246.4Ma±1.2Ma（N=17）。결합소측고석적CL도상특정，학정화강섬장반암취위발생재만이첩세-조삼첩세。
On the basis of previous studies, this paper carried out zircon U-Pb dating for mineralization-associated granodiorite por-phyry to further study its metallogenic epoch. Four groups of ages were obtained. The first group contains one zircon with 206Pb/238U age of 343Ma±2Ma;the second group contains one zircon with 206Pb/238U age of 264Ma±2Ma;the third group contains one zircon with 206Pb/238U age of 256Ma±2Ma;the fourth group comprises 17 zircons, whose 206Pb/238U ages vary from 240Ma to 249Ma, with a weighted mean 206Pb/238U age of 246.4Ma ± 1.2Ma (N=17). In conjunction with characteristics of CL imaging, the authors hold that the emplacement of granodiorite porphyry occurred between the Late Permian and Early Triassic.