| 北京地区中元古界下马岭组页岩地球化学特征及其地质意义 |
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| 引用本文： | 刘清俊,刘雨鑫,冯辉,孙小华,孟美杉,曹磊.北京地区中元古界下马岭组页岩地球化学特征及其地质意义[J].岩石矿物学杂志,2018,37(2):230-240. |
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| 作者姓名： | 刘清俊 刘雨鑫 冯辉 孙小华 孟美杉 曹磊 |
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| 作者单位： | 北京市地质勘察技术院;首都师范大学地球空间信息科学与技术国际化示范学院;北京市地质矿产勘查开发局;北京市地热研究院; |
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| 基金项目： | 北京市土壤地质环境监测网运行资助项目（PXM2017-158307-000001） |
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| 摘 要： | 对采自北京地区中元古界下马岭组的页岩样品,进行了地球化学研究,结果表明:主量元素Al2O3、Ca O和Na2O含量明显偏低,K2O和Mn O含量稍微偏低,Si O2、Ti O2及Fe2O3T含量同上地壳基本一致。微量元素及其比值特征显示源岩为混合源岩。稀土元素总量较高,轻稀土富集、重稀土平坦,铕明显负异常、铈弱负异常,各样品稀土元素配分模式与大陆上地壳一致,显示了沉积物具有同源性。源岩为来自于内蒙古隆起的花岗岩类、闪长岩类及基性岩的混合。微量元素比值及铈弱负异常的特征表明中元古界下马岭组页岩为覆水较深的还原环境沉积,源区构造背景为大陆岛弧。
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| 关 键 词： | 北京 中元古界 下马岭组 页岩 地球化学特征 意义 |
| 收稿时间： | 2017/5/8 0:00:00 |
Geochemical characteristics of Mesoproterozoic Xiamaling Formation shales in Beijing and their geological significance |
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| LIU Qing-jun,LIU Yu-xin,FENG Hui,SUN Xiao-hu,MENG Mei-shan and CAO Lei.Geochemical characteristics of Mesoproterozoic Xiamaling Formation shales in Beijing and their geological significance[J].Acta Petrologica Et Mineralogica,2018,37(2):230-240. |
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| Authors: | LIU Qing-jun LIU Yu-xin FENG Hui SUN Xiao-hu MENG Mei-shan and CAO Lei |
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| Institution: | Beijing Institute of Geo-exploration Technology, Beijing 100039, China,College of Geospatial Information Science and Technology, Capital Normal University, Beijing 100048, China,Beijing Institute of Geo-exploration Technology, Beijing 100039, China,Beijing Bureau of Geology and Mineral Resources Exploration and De-velopment, Beijing 100195, China,Beijing Institute of Geo-exploration Technology, Beijing 100039, China and Beijing Geothermal Research Institute, Beijing 102218, China |
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| Abstract: | Based on analyses of the sampled shales of field outcrops and well cuttings, the authors studied the geochemical characteristics of the shales of Mesoproterozoic Xiamaling Formation in Beijing. Al2O3, Na2O and K2O are depleted whereas SiO2, TiO2 and Fe2O3T are relatively enriched. The shales show homogeneous REE content, relatively enrichment of LREE and depletion of HREE,obvious negative Eu anomaly, and slightly negative Ce anomaly. The REE distribution patterns from different shale samples showing an affinity reveal that they have the same source rocks including granitic, dioritoid and mafic rocks from the upper continental crust of Inner Mongolia uplift, and the ratios of trace elements show these features too. They were deposited in a reducing environment with relatively deep water. The tectonic setting of the source area seems to have been a continental island arc. |
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| Keywords: | Beijing Mesoproterozoic Xiamaling Formation shale geochemical characteristics significance |
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