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华北克拉通南缘中条山_嵩山地区1_省略_性岩墙群的地球化学特征及构造环境_胡国辉.pdf

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1000-0569 / 2010 /026 ( 05) -1563-76 Acta Petrologica Sinica 岩石学报 - 1. 78Ga 华北克拉通南缘 中条 山 嵩 山地区 基性岩墙群 * 的地球化 学特征及构造环境 1 ,2 1 ,3 1 ,2 1** 胡国辉 胡俊 良 陈伟 赵太平 HU GuoHui1 ,2 ,HU JunLiang1 ,3 ,CHEN Wei1 ,2 and ZHAO TaiPing1 ** 1. , 510640 中国科学院广州地球化学研究所 广州 2. , 100039 中国科学院研究生院 北京 3. , 443003 宜昌地质矿产研究所 宜昌 1. Guangzhou Institute of Geochemistry ,Chinese Academy of Sciences ,Guangzhou 510640 ,China 2. Graduate School of Chinese Academy of Sciences ,Beij ing 100039 ,China 3. Yichang Institute of Geology and Minerals Resources ,Yichang 443003 ,China 2009-11-30 收稿 ,20 10-03-17 改回 . Hu GH ,Hu JL ,Chen W and Zhao TP. 2010. Geochemistry and tectonic setting of the 1. 78 Ga mafic dyke swarms in the Mt. Zhongtiao and Mt. Song areas ,the southern margin of the North China Craton. Acta Petrologica Sinica ,26( 5) : 1563 - 1576 Abstract Emplacement of the mafic dykes from mantle magmas represents the extension and rift event of crust. Many Mesoproterozoic mafic dyke swarms occur in Mt. Zhongtiao and Mt. Song areas ,southern margin of North China Craton ( NCC) . They are mainly diabase with minor gabbroic diabase and algovite ,which consist of plagioclase and chinopyroxene with minor hornblende , Fe-Ti oxides ,apatite ,biotite ,alkali feldspar and quartz. Zircon SHRIMP U-Pb dating indicates that the crystallization age of the dykes is 1785 ± 18Ma. These dykes ,similar to the Xiong ’er Group volcanic rocks ,belong to tholeiitic series. They are characterized by enrichment in large ion lithophile elements ( LILEs ,e. g
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