| 柴北缘锡铁山地区滩间山群构造变形分析 |
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| 引用本文： | 郭进京.柴北缘锡铁山地区滩间山群构造变形分析[J].地质调查与研究,2000(3). |
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| 作者姓名： | 郭进京 |
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| 作者单位： | 天津城市建设学院土木工程系!天津300381 |
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| 基金项目： | 中国地质调查局攻关项目!( 950 2 0 11) |
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| 摘 要： | 初步构造变形分析表明 ,柴北缘锡铁山地区的早古生代变质火山岩系 -滩间山群在加里东期碰撞造山过程中经历了两期构造变形 :第一期为垂直造山带的挤压缩短变形 ,形成一系列紧闭褶皱、区域片理和大型韧性剪切带 ;第二期为平行造山带的挤压缩短变形 ,形成区域透入性共轭破劈理或膝折带。这两期变形是柴北缘加里东期碰撞造山带的斜向碰撞造山过程中不同阶段变形特征的体现。这种构造型式可能对于认识斜向碰撞造山带的构造动力学的转换过程具有重要意义。
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| 关 键 词： | 柴北缘 锡铁山 滩间山群 构造变形分析 斜向碰撞造山 |
Structural Analysis of the Tanjianshan Group in the North Margin of Qaidam Block, China and Its Implication |
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| GUO Jin,jing.Structural Analysis of the Tanjianshan Group in the North Margin of Qaidam Block, China and Its Implication[J].Geological Survey and Research,2000(3). |
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| Authors: | GUO Jin jing |
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| Abstract: | The Tanjianshan Group, exposed in the north margin of Qaidam block, is a suit of Lower Paleozonic greenschist facies metamorphosed volcanic rocks. Structural analysis shows that it underwent two episodes of deformation during Caledonian collisional orogenesis. The first episode is characterized by NE-SW direction compression-shortening deformation, forming tight folds, penetrative schistosity and large scale ductile shear zone. The second episode is characterized by NW-SE direction compression-shortening deformation with formation of two conjugate fracture cleavages or kink bands. Analysis of kinematics of the deformation indicates that Early Palaeozoic collissional belt in the north margin of Qaidam block is an oblique collissional belt. Two episodes of deformation documented in the Tanjianshan Group are interpreted as the results of different stages of collissional orogenesis. |
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| Keywords: | Tanjianshan Group Structural analysis Oblique collision orogenesis Xitieshan aera North margin of Qaidam Block China |
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