| 内蒙古白云鄂博地区晚古生代闪长质-花岗质岩石年代学框架及其地质意义 |
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| 引用本文： | 范宏瑞,胡芳芳,杨奎锋,王凯怡,刘勇胜.内蒙古白云鄂博地区晚古生代闪长质-花岗质岩石年代学框架及其地质意义[J].岩石学报,2009,25(11):2933-2938. |
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| 作者姓名： | 范宏瑞 胡芳芳 杨奎锋 王凯怡 刘勇胜 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所,矿产资源研究重点实验室,北京,100029
2. 中国地质大学,地质过程与矿产资源国家重点实验室,武汉,430074 |
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| 基金项目： | 国家重点基础研究发展规划项目，国家自然科学基金项目 |
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| 摘 要： | 华北克拉通北缘的内蒙古白云鄂博地区分布着由辉长岩、辉长闪长岩、花岗闪长岩、二长花岗岩、黑云母花岗岩及钾长花岗岩等基性-中酸性-碱性花岗岩组成的闪长质-花岗质杂岩体,它们曾被认为是泥盆纪至侏罗纪多期次侵位的产物,而新的年代学资料揭示这些侵入体都是在晚古生代形成的.白云鄂博地区15件不同岩性的锆石LA-ICP-MS U-Pb测年表明,其侵位年龄具有很好的一致性,仅发生在263～281Ma狭窄时间段内,峰期年龄269Ma.这表明白云鄂博矿床的形成与这些闪长质-花岗质岩石的侵入活动没有直接的成因联系,也为重新认识华北克拉通北缘晚古生代构造环境及演化史提供了新的年代学资料.
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| 关 键 词： | 锆石年代学 闪长质-花岗质侵入体 晚古生代 地质意义 白云鄂博 |
Geochronology framework of late Paleozoic dioritic-granitic plutons in the Bayan Obo area,Inner Mongolia, and tectonic significance |
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| FAN HongRui,HU FangFang,YANG KuiFeng,WANG KaiYi,LIU YongSheng.Geochronology framework of late Paleozoic dioritic-granitic plutons in the Bayan Obo area,Inner Mongolia, and tectonic significance[J].Acta Petrologica Sinica,2009,25(11):2933-2938. |
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| Authors: | FAN HongRui HU FangFang YANG KuiFeng WANG KaiYi LIU YongSheng |
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| Abstract: | Dioritic-granitic plutons,composed of gabbro,gabbroic diorite,granitic diorite,adamellite,biotite granite and moyite,are distributed at Bayan Obo,Inner Mongolia in the north margin of North China Craton.These plutons were once regarded as intruding from Devonian to Jurassic.New geochronology data reveal that these plutons were formed in late Paleozoic.15 zircon LA-ICP-MS U-Pb ages from different dioritic-granitic plutons show that these plutons intruded at a narrow time of 263～281 Ma with peak age of 269 Ma.These new ages indicate no relationship between REE-Nb-Fe mineralization and dioritic-granitic plutons,and also provide evidence to re-recognize tectonic environment and evolution of the North China Craton in the late Paleozoic. |
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| Keywords: | Zircon geochronology Dioritic-granitie pluton Late Paleozoic Geological significance Bayan Obo |
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