| 蒙古戈壁阿尔泰巴音陶勒盖地区二长花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 付超,李俊建,唐文龙,党智财,Orolmaa Demberel.蒙古戈壁阿尔泰巴音陶勒盖地区二长花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2016,35(4):565-571. |
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| 作者姓名： | 付超 李俊建 唐文龙 党智财 Orolmaa Demberel |
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| 作者单位： | 1. 中国地质调查局天津地质调查中心, 天津 300170;2. 蒙古地质科学院, 蒙古 乌兰巴托 211238 |
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| 基金项目： | 中国地质调查局项目(编号:1212010561510、1212010811061、1212011120330、12120114001201、1212010781028、1212011085488)、国土资源公益性行业科研专项(编号:200811010)和国家国际科技合作项目(编号:2012DFB20220) |
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| 摘 要： | 蒙古戈壁阿尔泰省巴音陶勒盖地区地处南戈壁-阿尔泰构造带南缘,区内构造活动活跃,中酸性侵入岩比较发育。采用LA-ICP-MS锆石U-Pb测年技术,对区内二长花岗岩中的锆石进行同位素年龄研究。阴极发光图像显示,锆石颗粒多为自形-半自形,且有明显的初始岩浆振荡环带,少见蚀变微区,结合较高的Th/U值(0.65~1.79),断定其为典型的岩浆成因锆石;30颗锆石的~(206)Pb/~(238)U年龄加权平均值为300.2±0.9Ma,显示二长花岗岩成岩时代为晚石炭世,代表了华力西中期的一次构造-岩浆事件,为约束南戈壁-阿尔泰构造带晚石炭世深成岩浆活动时限提供了新证据。
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| 关 键 词： | 二长花岗岩 LA-ICP-MS锆石U-Pb年龄 南戈壁-阿尔泰 蒙古 |
| 修稿时间： | 3/7/2016 12:00:00 AM |
LA-ICP-MS zircon U-Pb dating of monzogranite in Bayintolgoi, Gobi-Altay, Mongolia, and its geological implications |
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| FU Chao,LI Junjian,TANG Wenlong,DANG Zhicai and OROLMAA Demberel.LA-ICP-MS zircon U-Pb dating of monzogranite in Bayintolgoi, Gobi-Altay, Mongolia, and its geological implications[J].Geologcal Bulletin OF China,2016,35(4):565-571. |
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| Authors: | FU Chao LI Junjian TANG Wenlong DANG Zhicai and OROLMAA Demberel |
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| Institution: | 1. Tianjin Center, China Geological Survey, Tianjin 300170, China;2. Mongolian Academy of Geological Sciences, Ulaanbaatar 211238, Mongolia |
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| Abstract: | Bayintolgoi region in Mongolia is located in the southern South-Gobi-Altay tectonic zone. In this region, tectonic move-ment is active and intermediate-acidic intrusive rocks are well developed. Analysis of LA-ICP-MS zircon U-Pb ages was conduct-ed for zircons from monzogranite in Bayintolgoi, Mongolia. As revealed by the cathodoluminescence images, all the zircons from monzogranite are euhedral-subhedral and have oscillatory zoning, with almost all the zircons having high Th/U ratios. These charac-teristics suggest a magmatic genesis of the analyzed zircons. 30 zircons yielded a weighted mean 206Pb/238U age of 300.2±0.9Ma. The results show that the monzogranite was formed in Upper Carboniferous and there existed a tectonic-magmatic event in the Middle Variscan. These data provide new evidence for the Upper Carboniferous orogeny in South-Gobi-Altay tectonic zone. |
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| Keywords: | monzogranite LA-ICP-MS zircon U-Pb ages South-Gobi-Altay Mongolia |
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