| 燕山东部柳江地区构造属性新解与郯庐断裂系活动 |
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| 引用本文： | 李越,季建清,涂继耀,龚俊峰,王振兰,王金铎.燕山东部柳江地区构造属性新解与郯庐断裂系活动[J].岩石学报,2009,25(3):675-681. |
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| 作者姓名： | 李越 季建清 涂继耀 龚俊峰 王振兰 王金铎 |
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| 作者单位： | 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室,北京,100871 |
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| 基金项目： | 国家大学生创新训练计划 |
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| 摘 要： | 传统意义上的柳江盆地位于燕山东段，完整地出露了从前寒武纪到中生界的华北地台盖层沉积地层，地层序列总体上呈中间新，两侧老的特点。前人认为柳江盆地为一轴向N10°E的不对称向斜。新的野外调查显示，柳江地区西侧陡立的产状是断裂作用形成的构造面理产状，为北北东向断裂构造的一部分，可以清楚识别的原始层面产状实际上与东部地层相似，为250°西倾25°~30°倾角。因此，将柳江地区东侧的原始层面产状与西侧的构造面理产状分别对应同一向斜两翼的传统观点是不恰当的。所谓柳江盆地实际上为单斜构造，是地壳断块在北北东向断裂的作用下西侧上升东侧下降的掀斜作用结果，过去对这一地区关于盆地和向斜构造属性的界定应该予以纠正。柳江地区在古生代和中生代时期是华北盆地的一部分，在新生代以来又同时接受剥蚀，一直不曾是独立的盆地单元。由于柳江断陷的沉降与西侧响山隆起相耦合，在两者边界起调节作用的北北东向断裂系具有左旋走滑兼具垂直运动分量的运动性质，是郯庐断裂系的组成部分，北北东向断裂系活动的时限与响山隆起的时限相对应，根据裂变径迹年龄分析结果，活动时代为白垩世末-古新世。
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| 关 键 词： | 响山岩体 单斜 郯庐断裂系 磷灰石裂变径迹 柳江地区 |
| 收稿时间： | 2008/12/15 0:00:00 |
| 修稿时间： | 2009/2/10 0:00:00 |
Structure of Liujiang terrain and implications for displacement of Tanlu fault system |
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| LI Yue,JI JianQing,TU JiYao,GONG JunFeng,WANG ZhenLan and WANG JinDuo.Structure of Liujiang terrain and implications for displacement of Tanlu fault system[J].Acta Petrologica Sinica,2009,25(3):675-681. |
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| Authors: | LI Yue JI JianQing TU JiYao GONG JunFeng WANG ZhenLan and WANG JinDuo |
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| Institution: | Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China |
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| Abstract: | Liujiang terrain locates in the eastern part of Yanshan with a whole sequence displaying a perfect stratum sequence of Paleozoic and Mesozoic sedimentary cover stratum of the North China Craton. Traditionally, Liujiang terrain is considered as a NS extending asymmetry syncline. The field investigation showed, however, that the foliation different from the occurrence of the strata in western Liujiang terrain is the result of faulting. It is irrational to refer the deformational orientation of western layer as a counterpart to the eastern original layer. Liujiang terrain is actually a monocline because of crustal block tilting. It is concluded that the sinking of Liujiang terrain was correlated to the exhumation of Xiangshan granite to its west side. NNE fault system, left-lateral with vertical displacement, constituted an important role in it. The exhumation of Xiangshan granite is due to NNE fault displacement. The apatite fission track dating is consistent with the cooling age of Xiangshan granite from the Late Cretaceous to Paleocene, which is also the time of the Liujiang terrain depression and the displacement of Tanlu fault system. |
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| Keywords: | Xiangshan granites Monocline Tanlu fault system Apatite fission track dating Liujiang |
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