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| 新疆奇台地区双泉金矿床的成矿时代 | |
| 引用本文： | 徐 斌,路彦明,顾雪祥,章文忠.新疆奇台地区双泉金矿床的成矿时代[J].地质通报,2009,28(12):1871-1884. |
| 作者姓名： | 徐 斌 路彦明 顾雪祥 章文忠 |
| 作者单位： | 1. 中国地质大学地球科学与资源学院,北京,100083;武警黄金第一总队,黑龙江,哈尔滨,150086 2. 武警黄金地质研究所,河北,廊坊,065000 3. 中国地质大学地球科学与资源学院,北京,100083 4. 武警黄金第八支队,新疆,乌鲁木齐,830057 |
| 基金项目： | 国家重点基础研究发展计划项目，长江学者和创新团队发展计划项目、高等学校学科创新引智计划项目 |
| 摘 要： | 新疆奇台县双泉金矿床位于东准噶尔地区，成矿带划分属卡拉麦里-达尔布特成矿带（Ⅲ级成矿带）之卡拉麦里-莫钦乌拉成矿带（Ⅳ级成矿带），是新疆重要的金-多金属成矿带。对双泉金矿蚀变矿物绢云母、含金石英脉进行了激光（单颗粒全熔样法）显微探针40Ar/39Ar同位素研究，3个绢云母样品等时线年龄分别为269Ma±9Ma、265Ma±2Ma、260 Ma±4Ma；石英样品等时线年龄为269Ma±8Ma。这些结果表明双泉金矿主成矿期成矿时代为269Ma±9Ma～260Ma±4Ma。东准噶尔地区早石炭世初至晚二叠世大规模陆陆碰撞造山及其后的伸展张弛构造运动期间，发生了2次大规模的构造流体热事件，同位素年龄记录的时间分别约为310Ma和260～270Ma。前者代表早期韧性构造变形期间产生变质流体并初始富集Au元素的时间，地球动力学背景为碰撞造山后期的挤压推覆体系；后者代表本区金矿主成矿期成矿作用发生的时间，是控矿断裂构造脆性变形的时间，地球动力学背景为碰撞造山期后的伸展张弛体系。 |
| 关 键 词： | Ar-Ar同位素年龄 成矿时代 双泉金矿 新疆 |
Metallogenic epoch of the Shuangquan gold deposit in Qitai area, Xinjiang, China. |
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| XU Bin,LU Yan-ming,GU Xue-xiang,ZHANG Wen-zhong.Metallogenic epoch of the Shuangquan gold deposit in Qitai area, Xinjiang, China.[J].Geologcal Bulletin OF China,2009,28(12):1871-1884. | |
| Authors: | XU Bin LU Yan-ming GU Xue-xiang ZHANG Wen-zhong |
| Abstract: | The Shuangquan gold deposit in Qitai County, Xinjiang, is located in east Junggar, which belongs to the Karamaili-Mo-qinwula mineralization belt (Ⅳ-grade metallogenic belt) of the Karamaili-Daerbute gold metallogenic belt (Ⅲ-grade metallogenic belt). In this paper, the laser microprobe ~(40)Ar/~(39)Ar isotopic dating was carried out on the alteration minerals of sericite and gold-bearing quartz veins in the Shuangquan gold deposit. The isochronic ages of three sericite samples are 269Ma±9Ma, 265Ma±2Ma and 260Ma±4Ma. A quartz sample returns an isochron age of 269Ma±8Ma. These results suggest that the main mineralization age of the Shuangquan gold deposit varies between 269Ma±9Ma and 260Ma±4Ma. During the large-scale continent-continent collision and the subsequent extensional tectonic movement in the early Carboniferous to late Permian, the east Junggar area underwent two large-scale fluid-thermal events which were recorded by isotopic ages of 310Ma and 260～270Ma, respectively. The former one represents an early ductile deformation and associated initial accumulation of metamorphic fluids, and its geodynamic background possibly belongs to post-collisional orogenic thrusting system. While the latter represents the main gold mineralization epoch and the formation of orecontrolling faults by brittle deformation, and its geodynamic background possibly belongs to post-collisional extension system. |
| Keywords: | Ar-Ar isotopic age metallogenic epoch Shuangquan gold deposit Xinjiang |
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