| 萍乐坳陷带西段伸展构造体系浅析 |
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| 引用本文： | 游正义,曾书明,刘金元.萍乐坳陷带西段伸展构造体系浅析[J].华东地质学院学报,2009,32(2):123-129. |
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| 作者姓名： | 游正义 曾书明 刘金元 |
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| 作者单位： | 江西省地质矿产勘查开发局赣西地质调查大队,江西,南昌,330201
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| 基金项目： | 致谢：本文在成文过程中得到覃兆松教授级高工的指导帮助,在此深表谢意. |
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| 摘 要： | 通过野外调研和资料分析，发现萍乐坳陷带西段存在一伸展构造体系，它由变质核杂岩、固态流变构造群落、浅层次的顺层正滑拆离断层以及晚期的重力滑脱构造体系组成。变质核杂岩外缘由以多条大环状分布外倾的花岗质糜棱岩带为代表的韧性剪切带组成，带中的矿物拉伸线理显示韧性剪切作用是沿隆起两翼近南北向进行的。顺层固态流变群落最突出的表现为浅变质岩中近水平的韧性剪切带。部分泥盆系-二叠系亦卷入顺层固态流变群落，表现为带内动力片岩及碳酸岩糜棱岩带。浅层次顺层正滑拆离断层多沿已存界面或岩性软弱面由南向北多层次滑移，并可分为后缘拉张、中部递进滑脱及前缘挤压三个构造分带。晚期重力滑脱体系主要发育于武功山北麓，由众多滑块组成。依据法国奥尔良大学所获变质核杂岩中糜棱岩同位素年龄可知，该伸展构造体系始于华力西晚期-印支期；依据卷入的地层，至少是燕山末期、甚至喜山期才结束.
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| 关 键 词： | 萍乐坳陷西段 伸展构造体系 顺层正滑断层 |
Analysis on Extensional Tectonics System in the West of Pingle Downwarping Region |
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| YOU Zheng-yi,ZENG Shu-ming,LIU Jin-yuan.Analysis on Extensional Tectonics System in the West of Pingle Downwarping Region[J].Journal of East China Geological Institute,2009,32(2):123-129. |
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| Authors: | YOU Zheng-yi ZENG Shu-ming LIU Jin-yuan |
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| Institution: | West Jiangxi Geological Surveying Party;Bureau of Exploration & Development of Geology & Mineral Resources of Jiangxi Province;Nanchang;JX 330201;China |
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| Abstract: | Studying on micro-disseminated gold deposits structure in the west in Pingle downwarping region,surveying in the field and analyzing the correlative data,the author found the existence of a stretching structure system,which formed by the metamorphic core complex,the solid-state rheological structure community,the superficial bedding sliding and decoupling normal fault,the late gravity slip structure system.Around the metamorphic core complex is a ductile shear zone composed by many orbicular tilted outside ... |
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| Keywords: | Pingle downwarping region extensional tectonics system bedding normal decoupling fault |
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