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巴尔喀什成矿带是世界著名的中亚成矿域斑岩型铜钼成矿带,产出许多斑岩型铜钼矿床和一些石英脉-云英岩型钨钼矿床。中亚成矿域可能是一个多核成矿系统,具有以走滑断裂为边界构成的断裂构造体系并受之控制。本文对巴尔喀什成矿带巴尔喀什—阿克沙套地区11件辉钼矿样品进行了Re-Os同位素分析,得到博尔雷大型斑岩型铜(钼)矿床和东科翁腊德、扎涅特、阿克沙套石英脉-云英岩型钨钼矿床的辉钼矿模式年龄(平均值)分别为315.9Ma、298.0Ma、295.0Ma和289.3Ma;其中,东科温腊德、阿克沙套和扎涅特等3个矿床的Re-Os等时线年龄为297.9-+30..949Ma,MSWD值为0.97。辉钼矿Re-Os年龄说明巴尔喀什成矿带Cu-Mo-W成矿作用发生在315.9～289.3Ma期间,Cu-Mo-W矿床的形成可分为两期:一期为斑岩型铜钼矿床,约形成于315.9Ma;另一期为石英脉-云英岩型钨钼矿床,约形成于297.9Ma。根据辉钼矿模式年龄和等时线年龄,推测该地区花岗斑岩和伟晶岩的形成时代与相应的矿床基本同时,均为晚石炭世,属海西期构造岩浆活动的产物。通过与我国境内西、东准噶尔和东天山斑岩铜矿带的对比表明,巴尔喀什成矿带铜钼成矿作用的年龄介于东天山土屋—延东斑岩铜矿与西准噶尔包古图斑岩铜矿之间。分析表明,中亚成矿域大规模斑岩型铜钼成矿作用集中在晚石炭世,属海西晚期构造-岩浆活动的产物。
The Balkhash metallogenic belt is a world-renowned porphyry copper-molybdenum metallogenic belt in the Central Asian metallogenic domain. Many porphyry copper-molybdenum deposits and some quartz vein-dolostone tungsten-molybdenum deposits have been produced. The Central Asian metallogenic domain may be a multi-nuclear metallogenic system with fault structures controlled by strike-slip faults. In this paper, 11 molybdenite samples in the Balkhash-Aksa area of the Balkhash metallogenic belt were analyzed by Re-Os isotope analysis, and the Bollei large porphyry copper (molybdenum) deposit and East Kozhichen, The molybdenite ages (average values) of the Neoter and Akshachuang quartz veins and the Yunyingyan tungsten-molybdenum deposit are 315.9Ma, 298.0Ma, 295.0Ma and 289.3Ma, respectively, of which, The Re-Os isochron ages of Keshatao and Zaniete are 297.9- + 30..949Ma and the MSWD is 0.97. The Re-Os age of molybdenite shows that the Cu-Mo-W mineralization in the Balkhash metallogenic belt occurred between 315.9 and 289.3 Ma. The formation of the Cu-Mo-W deposit can be divided into two phases. The first phase is porphyry copper The molybdenum deposit was formed about 315.9Ma and the other was quartz vein-dolostone type tungsten-molybdenum deposit, forming about 297.9Ma. According to the molybdenite model age and isochron age, it is speculated that the formation age of granite porphyry and pegmatite in the area is basically the same as that of the corresponding deposit at the same time, both of which are Late Carboniferous, which belongs to the product of Hercynian tectonic magmatism. The comparison with the porphyry copper belt in the west, east Junggar and East Tianshan shows that the age of copper-molybdenum mineralization in Balkhash metallogenic belt lies between the Tuwu-Yandong porphyry copper deposit in the East Tianshan Mountains and the paleo- Porphyry copper between. The analysis shows that the large-scale porphyry copper-molybdenum mineralization in the Central Asia metallogenic domain is concentrated in the Late Carboniferous, which is a product of tectonic-magmatic activity in the late Hercynian.