| 内蒙古达茂旗花岗岩类LA—ICP—MS锆石U—Pb年龄及其地质意义 |
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| 引用本文： | 冯丽霞,张志诚,韩宝福,任荣,李建锋,苏犁.内蒙古达茂旗花岗岩类LA—ICP—MS锆石U—Pb年龄及其地质意义[J].中国区域地质,2013(11):1737-1748. |
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| 作者姓名： | 冯丽霞 张志诚 韩宝福 任荣 李建锋 苏犁 |
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| 作者单位： | [1]北京大学造山带与地壳演化教育部重点实验室／北京大学地球与空间科学学院,北京100871 [2]中国地质大学北京地学实验中心．北京100083,北京100871 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）（编号：2013CB429806）和中国地质调查局项目（编号：1212011085474、1212011085476） |
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| 摘 要： | 对内蒙古达茂旗北部构造单元的巴特敖包岛弧带2个花岗闪长岩岩体样品和南部构造单元一个花岗岩岩体的2件样品进行了LA—ICP-MS锆石u—Pb定年。北部构造单元采自2个花岗闪长岩岩体的样品锆石^206Pb／^238U年龄分别为468Ma±2Ma和452Ma±2Ma，代表了这2个岩体的侵位时间，表明古亚洲洋向华北克拉通之下俯冲不晚于468Ma±2Ma；南部构造单元采自同一花岗岩岩体的2件样品获得的锆石~pb／z38U年龄分别为268Ma±2Ma和264Ma±2Ma，和该单元西部岩体已有的锆石年龄相符。这为华北克拉通北缘岩浆作用研究提供了新的年代学证据。
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| 关 键 词： | 达茂旗 奥陶纪 中二叠世 花岗岩类 LA—IcP—MS锆石U—Pb年龄 |
LA-ICP-MS zircon U-Pb ages of granitoids in Darhan Muminggan Joint Banner,Inner Mongolia,and their geological significance. |
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| FENG Li-xia,ZHANG Zhi-cheng,HAN Bao-fu,REN Rong,LI Jian-feng,SU Li.LA-ICP-MS zircon U-Pb ages of granitoids in Darhan Muminggan Joint Banner,Inner Mongolia,and their geological significance.[J].Regional Geology of China,2013(11):1737-1748. |
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| Authors: | FENG Li-xia ZHANG Zhi-cheng HAN Bao-fu REN Rong LI Jian-feng SU Li |
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| Institution: | 1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education/School of Earth and Space Sciences,Peking University, Beijing 100871, China; 2. Geological Lab Center, China University of Geosciences, Beijing 100083, China) |
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| Abstract: | This paper reports four zircon U-Pb ages of granitoids in Darhan Muminggan Joint Banner, Inner Mongolia. Two gran- odiorite samples from Bater magmatic arc in the northern part and two granite samples from a single pluton in the southern part were dated by LA-ICP-MS zircon U-Pb method so as to define their emplacement ages and provide constraints on the subduction and collisional events of the Paleo-Asian Ocean in the central part of Inner Mongolia. The two granodiorite samples yielded zircon U-Pb ages of 468Ma±2Ma and 452Ma±3Ma, respectively, indicating that the southward subduction of the paleo-Asian ocean beneath the North China Craton started at least at 468Ma, which resulted in the formation of Bater Obo magmatic arc, and the two granite samples gave zircon U-Pb ages of 268Ma±2Ma and 264Ma±2Ma, respectively, which are within the range of prexisting age data from the western pluton, although the tectonic setting of the Middle Permian plutonism in the southern part is still uncertain. |
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| Keywords: | Darhan Muminggan Joint Banner of Inner Mongolia Ordovician mid-Permian LA-ICP-MS zircon U-Pb ages |
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