| 北京门头沟地区棋盘岩铁辉长岩的发现及其地质意义 |
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| 引用本文： | 刘翠,邓晋福,苏尚国,赵国春,李芳凝,赵兴国.北京门头沟地区棋盘岩铁辉长岩的发现及其地质意义[J].现代地质,2007,21(2):327-331. |
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| 作者姓名： | 刘翠 邓晋福 苏尚国 赵国春 李芳凝 赵兴国 |
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| 作者单位： | 中国地质大学,地质过程与矿产资源国家重点实验室,北京,100083;中国地质大学,地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;国土资源部国土资源大调查项目 |
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| 摘 要： | 根据北京门头沟地区棋盘岩岩体的主元素分析结果,按Middlemost提出的TAS分类,有4个样品可以归属为橄榄辉长岩(Peridotgabbro)和似长石辉长岩(Foid Gabbro),属于辉长岩类,并且样品具有高铁(w(FeO*)>14%),贫硅(w(SiO2)<45%)的特征,因此属于铁辉长岩类。这是迄今为止燕山造山带存在铁辉长岩类岩石的首次报道。关于铁辉长岩类的成因目前还有争论,棋盘岩岩体在w(SiO2)-w(FeO*)/w(MgO)图解上显示有Fenner趋势,但是具体的成因还有待于进一步研究。铁辉长岩及其成因的研究将对揭示燕山期北京地区的构造环境和动力学背景、深部过程具有重要的启示意义。
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| 关 键 词： | 棋盘岩岩体 铁辉长岩 高铁贫硅 燕山造山带 |
| 文章编号： | 1000-8527（2007）02-0327-05 |
| 收稿时间： | 2007-03-01 |
| 修稿时间： | 2007-03-012007-05-08 |
The First Report of Qipanyan Ferrogabbro of Mentougou,Beijing,and Its Implications |
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| LIU Cui,DENG Jin-fu,SU Shang-guo,ZHAO Guo-chun,LI Fang-ning,ZHAO Xing-guo.The First Report of Qipanyan Ferrogabbro of Mentougou,Beijing,and Its Implications[J].Geoscience——Journal of Graduate School,China University of Geosciences,2007,21(2):327-331. |
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| Authors: | LIU Cui DENG Jin-fu SU Shang-guo ZHAO Guo-chun LI Fang-ning ZHAO Xing-guo |
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| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China; 2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | Based on the major element analyses of Qipanyan gabbro of the Mentougou area,Beijing and TAS classification diagram proposed by Middlemost,4 samples can be classified into peridotgabbro and foid gabbro.And the 4 samples are characterized by high Fe(total FeO*>14%)and low silica contents(SiO2<45%),thus belonging to ferrogabbro.This is the first report of ferrogabbros in the Yanshan orogenic belt.The petrogenesis of Qipanyan ferrogabbro will need to be studied detailedly though the SiO2-FeO*/MgO diagram of Qipanyan ferrogabbro shows the Fenner trend,because there are different opinions about the petrogenesis of ferrogabbro.The study of ferrogabbro and its petrogenesis will play an important role in studying tectonic setting and dynamic background,deep process of the Beijing area during Yanshanian Movement. |
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| Keywords: | Qipanyan pluton ferrogabbro high-Fe and low Si Yanshan orogenic belt |
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