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| 北京地区中生代侵入岩的时间序列及其地质意义 | |
| 引用本文： | 孙志明,汪洋,邓晋福,姬广义,夏希凡,苏尚国.北京地区中生代侵入岩的时间序列及其地质意义[J].矿物岩石地球化学通报,2007,26(3):258-262. |
| 作者姓名： | 孙志明 汪洋 邓晋福 姬广义 夏希凡 苏尚国 |
| 作者单位： | 1. 中国地质大学(北京),北京,100083 2. 中国地质大学(北京),北京,100083;中国科学院,广州地球化学研究所,同位素年代学和地球化学重点实验室,广州,510640 3. 北京市地质研究所,北京,100011 |
| 基金项目： | 国家自然科学基金资助项目（40572128,40376013,40104003） |
| 摘 要： | 为更好地理解燕山西段晚中生代岩浆活动的时空演化规律,根据近年来取得的高精度锆石U-Pb测年数据,本文研究北京地区中生代侵入岩的时间序列。北京地区中生代侵入活动发生在晚三叠世末-早侏罗世初、晚侏罗世-早白垩世两个阶段。现有资料尚无法确证北京地区有中侏罗世时期的深成岩浆活动,这表明前人厘定的八达岭杂岩带和北京地区中生代侵入岩岩石谱系问题甚多,未能反映北京地区中生代岩浆侵入事件的真实序列。根据侵入岩岩石组合和地球化学特征,燕山西段侏罗-白垩纪地壳发生减薄、进入后造山阶段的时限应该在130~125 Ma之后。建立完整的燕山西段晚中生代侵入活动时空分布格局,还需更多的野外工作和高精度锆石U-Pb年龄数据。 |
| 关 键 词： | 侵入岩 侵入序列 高精度锆石U-Pb年龄 中生代 北京 |
| 文章编号： | 1007-2802（2007）03-0258-05 |
| 修稿时间： | 2006-03-29 |
Temporal Sequence of Mesozoic Intrusive Bodies in the Beijing Area and Its Geological Significance |
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| SUN Zhi-ming,WANG Yang,DENG Jin-fu,JI Guang-yi,XIA Xi-fan,SU Shang-guo.Temporal Sequence of Mesozoic Intrusive Bodies in the Beijing Area and Its Geological Significance[J].Bulletin of Mineralogy Petrology and Geochemistry,2007,26(3):258-262. | |
| Authors: | SUN Zhi-ming WANG Yang DENG Jin-fu JI Guang-yi XIA Xi-fan SU Shang-guo |
| Institution: | 1. China University of Geosciences, Beijing 100083, China; 2. Key Laboratory of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guang zhou 510640, China; 3. Geological Institute of Beijing Municipality, Beijing 100011, China |
| Abstract: | In order to better understand the spatial-temporal evolution regularity of Late Mesozoic magmatism in the western part of the Yanshan mountain,the high precision Zircon U-Pb dating ages from recent studies have been compiled for summarizing the temporal sequence of the Mesozoic intrusive bodies exposed in the Beijing area.The result shows that two stages of Mesozoic intrusive events occurred from the end of Late Triassic to the beginning of Early Jurassic and from Late Jurassic to Early Cretaceous respectively.No evidence at present has been given to confirm that the Middle Jurassic plutonism is existed in the Beijing area.These results mean that there are lots of problems in the previous hierarchical structure of the previously delineated Badaling Complex and the Mesozoic intrusive rocks in the Beijing area because the previous hierarchical structure does not properly represent the actual sequence of the Mesozoic intrusive events.According to the intrusive rock assemblage and their geochemical features,it is inferred that,the Jurassic-Cretaceous crustal thinning and the post-orogenic stage should be occurred later than 130~125 Ma in the western part of the Yanshan mountain.It is believed that more field observations should be undertaken and more high-precision zircon U-Pb dating ages should be obtained for establishing the complete spatial-temporal pattern of Late Mesozoic intrusive activities in the western part of the Yanshan mountain. |
| Keywords: | pluton intrusive sequence high-precision zircon U-Pb dating age Mesozoic Beijing |
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