| 襄樊——广济断裂西段三里岗——三阳构造混杂岩带构造变形与演化 |
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| 引用本文： | 董云鹏,张国伟,姚安平,赵霞.襄樊——广济断裂西段三里岗——三阳构造混杂岩带构造变形与演化[J].地质科学,2003,38(4):425-436. |
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| 作者姓名： | 董云鹏 张国伟 姚安平 赵霞 |
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| 作者单位： | 西北大学大陆动力学教育部重点实验室 西安 710069 |
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| 基金项目： | 国家自然科学基金，49732080,40003003， |
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| 摘 要： | 襄樊——广济断裂西段的三里岗——三阳地区出露有构造混杂岩,以含蛇绿岩残块为特征,经历了复杂的构造变形和演化过程。不同区段的构造解析与对比表明,中生代以来该构造混杂岩带主要遭受了4期变形构造的叠加改造:1)高温塑性变形(D1),表现为蛇绿岩残块内部具网状强应变带和透镜状弱应变域相互交织的构造变形样式,强应变带形成以镁铁质糜棱岩为特征的高温韧性剪切带,显示深层次构造变形特征;2)逆冲推覆变形(D2),构造混杂岩带发育叠瓦状逆冲推覆构造和双冲构造,南界韧性剪切带是构造混杂岩带整体运移的主推覆面,发育长英质糜棱岩,形成于中等构造层次,岩石中发育镁铁质糜棱岩糜棱面理的褶皱构造,显示陆内逆冲推覆对先期高温塑性变形构造的叠加改造;3)韧脆性右行平移剪切(D3),形成构造混杂岩带内部浅层次构造变形,构造混杂岩带南侧的花山群钙质片岩揉皱变形,形成枢纽近直立的不对称褶皱,指示右行平移剪切变形;4)伸展正断层(D4),主要发育于构造混杂岩带北侧,呈NW——SE向展布,控制晚白垩世断陷盆地的形成与沉积充填。
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| 关 键 词： | 构造混杂岩带 构造变形 韧性剪切带 襄樊——广济断裂 南秦岭微陆块 |
| 文章编号： | 0563-5020(2003)04-0425-12 |
| 收稿时间： | 2001-03-09 |
| 修稿时间： | 2001年3月9日 |
DEFORMATION AND EVOLUTION OF THE SANLIGANG- SANYANG TECTONIC MELANGE BELT ALONG THE WEST SECTOR OF XIANGFAN-GUANGJI FAULT |
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| Dong Yunpeng,Zhang Guowei,Yao Anping,Zhao Xia.DEFORMATION AND EVOLUTION OF THE SANLIGANG- SANYANG TECTONIC MELANGE BELT ALONG THE WEST SECTOR OF XIANGFAN-GUANGJI FAULT[J].Chinese Journal of Geology,2003,38(4):425-436. |
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| Authors: | Dong Yunpeng Zhang Guowei Yao Anping Zhao Xia |
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| Institution: | Key Laboratory of Continental Dynamics in the Ministry of Education, Northwest University, Xi’an 710069 |
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| Abstract: | A tectonic melange belt was discovered in the Sanligang Sanyang area, Hubeiprovince, along the west sector of Xiangfan Guangji fault, east part of the south boundary of Qinling Orogenic Belt. It was composed of different tectonic blocks with varied lithological features and ages, mainly including ophiolitic blocks, island arc volcanic blocks, pelagic sediments, fore arc volcano sedimentary system, and massives of the basement and covering strata of the Yangtze Block. These massives were emplaced in the west sector of Xiangfan Guangji fault, which was a boundary between the Qinling Orogenic Belt and the Yangtze Block. Based on the detailed structure analysis of deformation of the Sanligang Sanyang tectonic melange belt, and compared with regional geology, it was suggested that the tectonic melange belt evolved four stages of deformation: 1) the high temperature ductile deformation in Middle Triassic, characterized by mafic mylonite which represented the high temperature ductile shear zone formed during the collisional event; 2) the middle temperature overthrust in Late Triassic and Early Jurassic, characterized by duplex in ophiolite, felsic mylonite in the south boundary fault and fold deformation of the foliation of mafic mylonite; 3) the right lateral shearing from Middle Jurassic to Early Cretaceous, featured by asymmetric folds with vertical hinge lines; and 4) the stretch normal faulting in age of Late Cretaceous, bounded on the north side of the tectonic melange and controlled the formation of fault basin and Upper Crataceous depositing. |
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| Keywords: | Tectonic melange belt Deformation Ductile shear zone The Xiangfan Guangji fault The South Qinling micro continent |
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