| 库鲁克塔格赛马山一带中元古界构造变形研究 |
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| 引用本文： | 李伟,王新昆.库鲁克塔格赛马山一带中元古界构造变形研究[J].新疆地质,2002,20(1):16-22. |
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| 作者姓名： | 李伟 王新昆 |
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| 作者单位： | 1. 新疆维吾尔自治区地质矿产勘查开发局,新疆,乌鲁木齐,830000
2. 新疆维吾尔自治区国土资源厅,新疆,乌鲁木齐,830011 |
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| 摘 要： | 通过构造解析的研究，确定赛马山地区中元古代所发生的阿尔金运动共有三幕变形，第一幕发生在长城纪早期，为EW向伸展机制下中部构造相的大规模顺层滑脱韧性变形，形成了赛马西山顺层滑脱韧性变形带，具超塑性流动变形特征和多层结构样式，第二幕发生在长城纪末，为主期变形，在NS向挤压机制下，在浅部构造相形成了EW向紧闭褶皱（局部倒转褶皱），并卷入早期的顺层滑脱韧性变形带，褶皱后期，由于应力的集聚，在浅表层次下，沿兴地塔格群内岩层软弱面发生剪切而形成了滑脱面，产生由南向北的逆冲，形成了具叠瓦扇结构的永红山飞来峰构，第三幕，蓟县纪末由于SN向强烈挤压后出现“松驰”引张而产生EW向挤压应力，形成NS向开阔褶皱，叠加于主期褶皱之上，形成了赛马西山－永红山穹盆构造。
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| 关 键 词： | 新疆 库鲁克塔格 赛马山 韧性变形带 顺层滑脱 飞来峰 穹盆构造 中元古界 |
| 文章编号： | 1000-8845(2002)01-0016-07 |
| 修稿时间： | 2001年3月30日 |
STRUCTURAL DEFORMATION OF THE PROTEROZOIC ALONG HORSE RACING MOUNTAINS, KURUKTAG |
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| LI Wei,WANG Xin-kun.STRUCTURAL DEFORMATION OF THE PROTEROZOIC ALONG HORSE RACING MOUNTAINS, KURUKTAG[J].Xinjiang Geology,2002,20(1):16-22. |
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| Authors: | LI Wei WANG Xin-kun |
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| Institution: | LI Wei1,WANG Xin-kun2 |
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| Abstract: | The study area is located at the northeastern margin of Tarim basin. Structural analysis reveals that the complex structural deformation formed at different phases. The present structural framework is mainly composed of a western Horse Racing Mountains (HRM) along-bedding detachment ductile deformation zone, Yonghong Mountains nappe and western HRM-Yonghong Mountains dome-basin. The detachment zone occurs within the Xinditag Group of the Paleo-Proterozoic and the Changcheng System of the Middle Proterozoic. The nappe is composed of the Xinditag Group and thrust over a structural basin composed of the Changcheng System. The dome-basin structure influences not only the Changcheng era but also the underlying Xinditage Group. The three structural elements have a close temporal and dimensional relationship. The ductile deformation zone is involved into the dome-basin structure thrust over by the nappe which has the same folding and overlapping structures as the ductile zone and syncline structures corresponding with the main phase of folding structure of the dome-basin structure. Three phases of tectonic movements are thus determined during the Middle Proterozoic. The first phase happened at the early Middle Proterozoic during which large scale along-bedding detachment ductile deformation developed at central depth due to EW-trending extension. The deformation of this phase has features of plastic deformation and multi-layer structures. The second phase occurred at the end of Changcheng Era during which EW-trending tight folds (locally overturned) were developed at shallow depth due to N-S compression. The deformation of this phase influences the earlier ductile deformation. The Yonghong Mountains nappe with overlapping structures formed at shallow depth during the latest phase of folding due to northward thrusting along weak zone of the Xinditage Group. The third phase took place at the end of the Jixian Era during which NS-trending open folds formed by EW-trending compression caused by relaxation of NS-trending intense compression. The HRM-Yonghong Mountains dome-basin formed in a framework of multiphase deformation and resulted from overlapping of earlier structures. |
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| Keywords: | Xinjiang Kuruktag Horse Racing Mountains ductile deformation zone along-bedding detachment nappe dome-basin structure |
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