| 太行山阜平杂岩中麻棚-赤瓦屋岩体的时代、侵位深度及构造意义 |
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| 引用本文： | 李林林,韩宝福,苗国均,舒桂明,陈家富,杨进辉,杨岳衡,张艳斌.太行山阜平杂岩中麻棚-赤瓦屋岩体的时代、侵位深度及构造意义[J].岩石矿物学杂志,2012,31(3):289-306. |
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| 作者姓名： | 李林林 韩宝福 苗国均 舒桂明 陈家富 杨进辉 杨岳衡 张艳斌 |
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| 作者单位： | 1. 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京100871
2. 岩石圈演化国家重点实验室,中国科学院地质与地球物理研究所,北京100029 |
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| 基金项目： | 国家自然科学基金资助项目(90714006);中国地质调查局项目(1212011120135) |
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| 摘 要： | 中生代岩浆活动在太行山北段形成了一系列花岗岩体,其中的麻棚-赤瓦屋岩体侵位于穹窿状的阜平杂岩中,具有贫硅、富碱、高铝的钙碱性I型花岗岩特征。岩体分带明显,由边部向核部可以划分为石英闪长岩、花岗闪长岩、似斑状花岗岩3个相带,它们的锆石LA-ICP-MS U-Pb年龄分别为126.4±2.4 Ma、125.4±2.0 Ma和126.2±2.0 Ma,在误差范围内一致,指示岩体在早白垩世期间快速侵位、结晶。各相带样品的角闪石全铝平均值分别为1.018、0.880和0.871,对应的角闪石平均结晶压力分别为0.183、0.118和0.114 GPa,均值为0.141 GPa,对应的侵位深度约5 km,明显小于区域内元古界至侏罗系的地层厚度,表明在岩体侵位之前,阜平杂岩就已经具有穹窿状构造特征。结合相关资料,估计太行山早白垩世以来的平均隆升速率为0.07~0.08 km/Ma。
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| 关 键 词： | 麻棚-赤瓦屋岩体 锆石U-Pb定年 角闪石全铝压力计 侵位深度 隆升速率 太行山 |
| 收稿时间： | 2011/3/21 0:00:00 |
| 修稿时间： | 2012/1/3 0:00:00 |
Geochronology, emplacement depth and tectonic implications of the Mapeng- Chiwawu granitic pluton in Fuping Complex of the Taihang Mountains |
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| LI Lin-lin,HAN Bao-fu,MIAO Guo-jun,SHU Gui-ming,CHEN Jia-fu,YANG Jin-hui,YANG Yue-heng and ZHANG Yan-bin.Geochronology, emplacement depth and tectonic implications of the Mapeng- Chiwawu granitic pluton in Fuping Complex of the Taihang Mountains[J].Acta Petrologica Et Mineralogica,2012,31(3):289-306. |
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| Authors: | LI Lin-lin HAN Bao-fu MIAO Guo-jun SHU Gui-ming CHEN Jia-fu YANG Jin-hui YANG Yue-heng and ZHANG Yan-bin |
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| Institution: | 1.Ministry of Education Key Laboratory of Orogenic Belts and Crustal Evolution,School of Earth and Space Sciences,Peking University,Beijing 100871,China;2.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China) |
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| Abstract: | It is known that Mesozoic magmatism generated a series of granitic plutons in the northern segment of the Taihang Mountains.Among others,the MapengChiwawu pluton just crops out in the central part of the Neoarchean-Paleoproterozoic Fuping Complex,showing I-type calc-alkaline affinity,with low SiO2 and high Al2O3 and alkali content.The pluton consists of quartz diorite,granodiorite and granite from edge to core,and these intrusions yielded LA-ICP-MS zircon U-Pb ages of 126.4±2.4 Ma,125.4±2.0 Ma and 126.2±2.0 Ma,indicating that the pluton was emplaced in a short time around 126 Ma (Early Cretaceous).The total amount of Al in hornblende is 1.018,0.880 and 0.871 for quartz diorite,granodiorite and granite,and accordingly the crystallization pressure of hornblende is 0.183,0.118 and 0.114 GPa,with an average of 0.141 GPa,indicating a depth of ca.5 km.This is significantly smaller than the thickness of Proterozoic to Jurassic sequences around the Fuping Complex,suggesting a dome-shaped structure for the Fuping Complex before the Early Cretaceous.Combined with other data,an average uplift rate of 0.07～0.08 km/Ma can be obtained for the Taihang Mountains since the Early Cretaceous. |
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| Keywords: | Mapeng-Chiwawu granitic pluton zircon U-Pb age Al-in-hornblende barometer emplacement depth uplift rate Taihang Mountains |
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