| 豫西小秦岭地区晚古元古代地壳深熔作用及构造意义:岩石学和锆石U-Pb年代学证据 |
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| 引用本文： | 朱越,周汉文,李少林,谢瑜,丁振举,李建威,姚书振.豫西小秦岭地区晚古元古代地壳深熔作用及构造意义:岩石学和锆石U-Pb年代学证据[J].地球科学,2015,40(5):824-839. |
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| 作者姓名： | 朱越 周汉文 李少林 谢瑜 丁振举 李建威 姚书振 |
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| 作者单位： | 1.中国地质大学地球科学学院，湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金重大研究计划重点项目，国土资源部全国危机矿山项目 |
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| 摘 要： | 太华群出露于华北中部造山带南段，是研究华北克拉通南缘演化的关键地区，对其研究不仅有助于深入了解华北克拉通古、中元古代构造演化特征，对于华北克拉通东西陆块碰撞时间的厘定也具有重要意义.通过对豫西小秦岭地区太华群深熔作用形成的3类混合岩开展岩相学研究，发现深熔作用对岩石的改造是不均匀的，明显受到了原岩的物质成分、岩石的结构构等性质的制约.通过对岩浆锆石及深熔锆石进行LA-ICP-MS定年，确定小秦岭地区太华群混合岩原岩年龄为早古元古代，深熔作用发生时间约为1.8 Ga.研究区混合岩形成于华北克拉通东、西陆块碰撞后的伸展阶段，与区域同时期形成的大量基性岩墙群及A型花岗岩共同记录了华北克拉通在1.8 Ga前后发生的大规模伸展拉张事件.
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| 关 键 词： | 太华群 混合岩 深熔作用 地质年代学 华北克拉通南缘 岩石学 构造地质学 |
| 收稿时间： | 2014-09-30 |
Late Paleoproterozoic Crustal Anatexis and Its Tectonic Significance:Evidence from Petrology and Zircon U-Pb Ages of Migmatite from Xiaoqinling Area,West Henan |
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| Zhu Yue,Zhou Hanwen,Li Shaolin,Xie Yu,Ding Zhenju,Li Jianwei,Yao Shuzhen.Late Paleoproterozoic Crustal Anatexis and Its Tectonic Significance:Evidence from Petrology and Zircon U-Pb Ages of Migmatite from Xiaoqinling Area,West Henan[J].Earth Science-Journal of China University of Geosciences,2015,40(5):824-839. |
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| Authors: | Zhu Yue Zhou Hanwen Li Shaolin Xie Yu Ding Zhenju Li Jianwei Yao Shuzhen |
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| Abstract: | The Taihua Group, exposed in the southernmost terminal Trans-North China Orogen (TNCO), is important for deciphering the mysterious evolution processes of the southern margin of the North China Craton during Proterozoic, and determination of the collision time of the eastern and western blocks of the North China Craton. Petrological study on three kinds of migmatites formed by anatexis from the Taihua Group in Xiaoqinling area, West Henan, indicates that the transformation of migmatites caused by anatexis is uneven, which is obviously limited by the composition of protolith, structure of rocks and other properties. LA-ICP-MS U-Pb dating of the anatexis zircons shows that the protolith crystallized in the Paleoproterozoic and the anatexis occurred at about 1.8 Ga. The migmatites and contemporaneous mafic dike swarms and A-type granite in the study area were generated in a post-orogenic, extensional environment following continent-continent collision at 1.85 Ga between the eastern and western blocks of the North China Craton. |
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| Keywords: | Taihua Group migmatite anatexis geochronology southern margin of North China Craton petrology tectonics |
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