| 华北-西伯利亚板块对接带早白垩纪的裂解: 来自西拉木伦断裂带中性岩墙群的锆石U-Pb年龄及地球化学证据 |
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| 引用本文： | 李益龙,周汉文,钟增球,尹淑苹,李福林. 华北-西伯利亚板块对接带早白垩纪的裂解: 来自西拉木伦断裂带中性岩墙群的锆石U-Pb年龄及地球化学证据[J]. 地球科学, 2010, 35(6): 921-932. DOI: 10.3799/dqkx.2010.107 |
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| 作者姓名： | 李益龙 周汉文 钟增球 尹淑苹 李福林 |
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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： | 国家重点基础研究“973”项目(No.2007CB411307); 中国地质调查局项目(No.1212010510507) |
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| 摘 要： | 在内蒙古林西县西拉木伦断裂带内发育规模较大的中性岩墙群, 岩墙多呈NE3°~5°近直立侵入.对岩石进行了锆石LA-ICP-MS U-Pb定年和详细的岩石地球化学特征研究.锆石LA-ICP-MS U-Pb年龄为132.2±2.2Ma, 岩石侵位于早白垩世.岩石地球化学特征显示岩石具有高钾钙碱性系列-钾玄岩系列的过渡特征, 形成于板内拉张环境, 岩浆源区具有壳幔混源的特征, 是早期俯冲洋壳遭受幔源岩浆底侵作用的结果.岩墙的产状受左旋剪切机制控制, 该机制可能主要与太平洋板块相对亚洲板块的向北运动有关.
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| 关 键 词： | 中性岩墙群 锆石LA-ICP-MS U-Pb定年 地球化学 西拉木伦断裂带 内蒙古 |
| 收稿时间： | 2010-05-26 |
Extension of Suture Zone Between North China and Siberia Craton in Early Cretaceous:Insights from Geochronology and Geochemistry of Intermediate Dykes from Xar Moron Fault Belt in Inner Mongolia |
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| LI Yi-long,ZHOU Han-wen,ZHONG Zeng-qiu,YIN Shu-ping,LI Fu-ling .Faculty of Earth Sciences,China University of Geosciences,Wuhan ,China .State Key Laboratory of Geological Processes , Mineral Resources,China. Extension of Suture Zone Between North China and Siberia Craton in Early Cretaceous:Insights from Geochronology and Geochemistry of Intermediate Dykes from Xar Moron Fault Belt in Inner Mongolia[J]. Earth Science-Journal of China University of Geosciences, 2010, 35(6): 921-932. DOI: 10.3799/dqkx.2010.107 |
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| Authors: | LI Yi-long ZHOU Han-wen ZHONG Zeng-qiu YIN Shu-ping LI Fu-ling .Faculty of Earth Sciences China University of Geosciences Wuhan China .State Key Laboratory of Geological Processes Mineral Resources China |
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| Affiliation: | LI Yi-long1,2,ZHOU Han-wen1,ZHONG Zeng-qiu1,YIN Shu-ping3,LI Fu-ling1 1.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China 2.State Key Laboratory of Geological Processes and Mineral Resources,China 3.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China |
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| Abstract: | A large scale of intermediate dykes developed in Xar Moron fault belt in Linxi county, Inner-Mongolia, with NE3° to 5° angle of strike and nearly vertical trend. LA-ICP-MS zircon U-Pb dating method and whole rock geochemistry test were applied. It is indicated that the intermediate dykes emplaced in Lower Cretaceous with LA-ICP-MS zircon U-Pb age of 132.2±2.2Ma. The whole rock geochemistry of the dykes reveals transition characteristics between high potassium calc-alkaline series and shoshonite series. They formed in intraplate extensional background and sourced from crust-mantle magmatic mixing, which result from the mantle magma underplating below the early subducted oceanic crust. The strike of the dykes was chronically controlled by a sinistral shear mechanism in the area, which might be related to the northward movement of Pacific plate to Asian plate. |
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| Keywords: | intermediate dykes LA-ICP-MS zircon U-Pb dating geochemistry Xar Moron fault belt Inner-Mongolia |
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