| 阿尔泰克因布拉克铜锌矿区二云母正长花岗岩成岩时代及地质意义 |
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| 引用本文： | 李香仁,刘锋,杨富全.阿尔泰克因布拉克铜锌矿区二云母正长花岗岩成岩时代及地质意义[J].新疆地质,2012,30(1):5-11. |
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| 作者姓名： | 李香仁 刘锋 杨富全 |
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| 作者单位： | 1. 新疆维吾尔自治区地质矿产勘查开发局第四地质大队,新疆阿勒泰,836500
2. 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点开放实验室,北京 100037 |
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| 基金项目： | “十一五”国家科技支撑计划重点项目(2006BAB07B02-01,2007BAB25B01);国土资源大调查项目(1212010786006)联合资助 |
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| 摘 要： | 克因布拉克铜锌矿床矿区二云母正长花岗岩产于阿尔泰南缘额尔齐斯构造带北侧冲乎尔火山沉积盆地中,铜锌矿的形成与该花岗质岩浆期后热液活动有密切关系.LA-MC-ICP-MS U-Pb法测定其成岩时代为(278.6±3.5)Ma(MSDW=2.8),是海西晚期岩浆活动产物.结合矿区石英脉中黑云母Ar-Ar坪年龄(245 Ma)和阿尔泰南缘二叠纪晚期—三叠纪时期区域变形、变质作用特征限定铜锌矿成矿时代为早—中二叠世.综合前人研究成果认为,二云母正长花岗岩形成于后碰撞造山环境,与大规模区域性剪切作用有关,可能在地壳伸展拉张作用晚期,由于幔源岩浆的底侵作用,导致康布铁堡组中变质沉积岩发生部分熔融,后经结晶形成.
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| 关 键 词： | 阿尔泰 克因布拉克 花岗岩 LA-MC-ICP-MSU-Pb定年 后碰撞 |
Geological Times and its Signification of the Two Mica Syenogranite in the Keyinblak Cu-Zn Deposit Area in Altay,Xinjiang |
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| LI Xiang-ren
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LIU Feng
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YANG Fu-quan.Geological Times and its Signification of the Two Mica Syenogranite in the Keyinblak Cu-Zn Deposit Area in Altay,Xinjiang[J].Xinjiang Geology,2012,30(1):5-11. |
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| Authors: | LI Xiang-ren LIU Feng YANG Fu-quan |
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| Institution: | 1.No.4 geological party,Xinjiang Bureaμ of Geology and Mineral Resources,Altay,Xinjiang,836500,China;2.MRL Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources, Chinese Academy of Geological Sciences,Beijing,100037,China) |
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| Abstract: | The two-Mica syenogranite in the Keyinblak Cu-Zn deposit area is located in Chonghuer sedimentary volcanic basin near the north of Erqis tectonic belt in the southern margin of Altay.The postmagmatic hydrothermalism are closely related to the deposit.The age of(278.6±3.5) Ma(MSDW=2.8)for the pluton by LA-MC-ICP-MS attributes to late Hercynian.Adding to the Ar-Ar age of 245Ma for biotite in quartz vein in the deposit area and the regional deformation and metamorphism in the southern margin of Altay from late Permian to Trias,the deposit is definite to formed in the early-middle Permian.Synthesizing the former study,we suggest that The two-Mica granite has formed in post-collisional processes and may be related to the local large scale shear event,probably as a result of part melting of metasedimentary rocks in Kangbutiebao formation due to the underplating of magma from mantle source during the late period of crustal extension. |
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| Keywords: | Altay Keyinbulake Granite LA-MC-ICP-MS U-Pb dating Post-collision |
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