| 新疆西天山吐拉苏—也里莫墩火山岩带年代学: 对加曼特金矿成矿时代的约束 |
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| 引用本文：白建科,李智佩,徐学义,茹艳娇,李婷.2011.新疆西天山吐拉苏—也里莫墩火山岩带年代学: 对加曼特金矿成矿时代的约束[J].地球学报,32(3):322-330. |
| DOI：10.3975/cagsb.2011.03.07 |
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| 基金项目:中国地质调查局项目“西北地区重要成矿带基础地质综合研究”(编号: 1212010610319); “天山—兴蒙成矿带火山岩浆作用对成矿制约的综合研究”(编号: 1212010050503) |
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| 中文摘要:吐拉苏—也里莫墩火山岩带是西天山北段晚古生代构造一岩浆成矿带的重要组成部分, 它严格控制着矿带内金矿床的时空分布。在充分研究前人资料的基础上, 本文实测了也里莫墩地区加曼特金矿围岩大哈拉军山组火山岩剖面, 发现火山岩地层与矿化关系密切。利用LA-ICP-MS锆石U-Pb方法测定了金矿赋矿围岩(英安岩)的形成时代, 其206Pb/238U谐和年龄为354.0±1.3 Ma(MSWD=1.4), 表明加曼特金矿赋矿围岩大哈拉军山组火山岩形成于早石炭世, 金矿成矿时代被约束在354.0±1.3 Ma至早石炭世维宪期之间; 区域对比表明, 吐拉苏—也里莫墩火山岩带中分布着大规模的中酸性火山岩-火山碎屑岩, 受构造控制影响, 东西段火山岩的喷发时间存在一定的差异。 |
| 中文关键词:加曼特金矿 早石炭世 锆石U-Pb年龄 吐拉苏—也里莫墩火山岩带 西天山 |
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| The Chronology of Tulasu-Yelimodun Volcanic Belt: Constraints on the Metallogenic Epoch of the Jiamante Gold Deposit, Western Tianshan Mountains of Xinjiang |
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| Abstract:The Tulasu-Yelimodun volcanic belt is a key component part of the Late Paleozoic tectonic-magmatic metallogenic belt in the northern part of western Tianshan Mountains and strictly controls the temporal and spatial distribution of gold deposits within the ore belt. Based on geological data available, the authors measured the section of Dahalajunshan Formation volcanic host rocks of the Jiamante gold deposit in Yelimodun area, and the result shows that the volcanic strata are closely related to mineralization. LA-ICP-MS dating of zircons separated from dacite (the host rock of the gold deposit) yields a concordant 206Pb/238U age of 354.0±1.3 Ma(MSWD=1.4), suggesting that volcanic host rocks were formed in the Early Carboniferous, and the metallogenic epoch of the Jiamante gold deposit is constrained between 354.0±1.3 Ma and the Visean period of the Early Carboniferous. Regional correlation shows that there exist extensive intermediate-acidic volcanic-volcaniclastic rocks. Meanwhile, due to tectonic controls, there are differences in eruption time between the eastern and the western Tulasu-Yelimodun volcanic belt. |
| keywords:Jiamante gold deposit Early Carboniferous zircons U-Pb dating Tulasu-Yelimodun volcanic belt western Tianshan Mountains |
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