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黄羊山西金矿位于东准噶尔卡拉麦里成矿带的中段,它由4条含金矿脉组成,矿化发生在富钾、偏碱性花岗斑岩中。为了限定成矿时代,采用LA-MC-ICP-MS U-Pb同位素定年法对含矿花岗斑岩中的锆石进行了系统的年代学测试;3件样品的锆石CL阴极图像和测试结果揭示花岗斑岩成岩时间为318.4~310.3Ma,年龄分别为(318.4±1.1)Ma(MSWD=1.3)、(310.3±2.6)Ma(MSWD=2.1)、(315.9±2.2)Ma(MSWD=2.1)。结合区域地壳演化特征,初步厘定卡拉麦里地区在晚古生代发生两期金成矿作用:早期与偏碱性岩浆活动有关,晚期与韧-脆性构造变形有关;二者均发生在晚古生代碰撞造山期后的伸展环境。
The Huangyang Shanxi gold deposit is located in the middle of the Kalamaili metallogenic belt in eastern Junggar. It consists of 4 gold-bearing ore veins, and mineralization takes place in potassium-rich and alkaline-alkaline granite porphyries. In order to define the metallogenic epoch, systematically chronological testing of zircons in ore-bearing granite porphyries was performed using the LA-MC-ICP-MS U-Pb isotope dating method. Three samples of zircon CL images and tests The results showed that the granitic porphyry diagenesis time was 318.4 ~ 310.3Ma, the ages were (318.4 ± 1.1) Ma (MSWD = 1.3), 310.3 ± 2.6 Ma (MSWD = 2.1) and (315.9 ± 2.2) Ma 2.1). Based on the regional crustal evolution characteristics, two gold mineralization events occurred in the Late Paleozoic in the Kalamaili region: the early stage was related to the alkaline magmatic activity and the late stage was related to the ductile-brittle structural deformation; both occurred during the Late Paleozoic collision orogeny After stretching the environment.