| 秦岭商丹断裂带的构造样式与变形分析 |
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| 引用本文： | 李加好,宋传中,任升莲,涂文传,张欢,张浩然.秦岭商丹断裂带的构造样式与变形分析[J].地学前缘,2010,17(4):197. |
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| 作者姓名： | 李加好 宋传中 任升莲 涂文传 张欢 张浩然 |
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| 作者单位： | 合肥工业大学资源与环境工程学院,安徽,合肥,230009 |
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| 基金项目： | 国家自然科学基金项目，中国石油化工股份有限公司基础研究项目 |
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| 摘 要： | 商丹断裂带作为扬子板块与华北板块的缝合带,在秦岭造山带中占据重要的地位。对其进行精细的构造研究,是了解扬子板块与华北板块相互作用过程的关键。研究工作在商丹断裂带东段展开,对该带进行了详细的野外观察、显微构造观察、糜棱岩化过程中温度的估算、有限应变测量、差异应力的计算以及糜棱岩化过程中运动学涡度的计算。变形温压条件指示糜棱岩形成于中-高绿片岩相到低角闪岩相变质条件。差异应力计算结果指示商丹带具备大型构造动力特征。涡度分析表明该断裂带的变形以纯剪切作用占据主导作用,但包含有简单剪切的分量,从而证明了扬子板块与华北板块之间具有以碰撞挤压为主的斜向汇聚方式。
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| 关 键 词： | 秦岭造山带 商丹断裂带 板块碰撞带 花状构造 涡度分析 |
Tectonic style and deformation analysis of Shangdan fault belt in Qinling Orogen |
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| Li Jiahao,Song Chuanzhong,Ren Shenglian,Tu Wenchuan,Zhang Huan,Zhang Haoran.Tectonic style and deformation analysis of Shangdan fault belt in Qinling Orogen[J].Earth Science Frontiers,2010,17(4):197. |
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| Authors: | Li Jiahao Song Chuanzhong Ren Shenglian Tu Wenchuan Zhang Huan Zhang Haoran |
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| Abstract: | The Shangdan fault belt as the suture zone of the Yangtze Plate and the North China Plate occupies a significant position in the Qinling Orogen. To study the fine-structure of the Shangdan fault belt is a key step in understanding the interaction process of the Yangtze Plate and the North China Plate. The study was implemented at the eastern section of the Shangdan fault belt,in which we carried out the detailed field survey,microstructure analysis,the estimation of temperature of deformed rocks,the finite strain measurement,the calculation of differential stress and the calculation of kinematic vorticity during the mylonitization. The temperature and pressure of the deformation suggested that the mylonites formed in the middle-high greenschist facies to low amphibolite facies metamorphic conditions. The differential stress indicated that the Shangdan fault belt is a structure belt with large-scale dynamic characteristics. The kinematic vorticity suggested that the deformation was mainly the pure shear with the component of simple shear,which proved the boundary between the Yangtze Plate and the North China Plate was an oblique convergence boundary mainly characterized by compression. |
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| Keywords: | Qinling orogenic belt Shangdan fault belt suture zone flower structure kinematic vorticity analysis |
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