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| 米仓山构造带的应变与涡度分析 | |
| 引用本文： | 李金玺,孙东,刘树根,李智武,邓宾,汤聪,万洪程.米仓山构造带的应变与涡度分析[J].矿物岩石,2012,32(1):48-54. |
| 作者姓名： | 李金玺 孙东 刘树根 李智武 邓宾 汤聪 万洪程 |
| 作者单位： | 1. 成都理工大学地球物理学院,四川成都,610059 2. 四川省地矿局成都水文工程地质中心,四川成都,610081 3. 油气藏地质及开发工程重点实验室,四川成都,610059 |
| 摘 要： | 米仓山构造带东西向的断裂逆冲兼左旋走滑,西段的韧性变形较强,东段脆性为主。北东向三个主断裂带由北而南逆冲兼左行剪切,早期可能发生脆韧性变形,后期叠加了脆性变形。前震旦系基底岩系变形特征主要表现为透入性流变,碎斑结构和糜棱结构发育,镶嵌构造、S-C组构、带状构造、眼球构造为主,局部偶见"δ"和"σ"旋转碎斑以及矿物鱼。石英颗粒以亚颗粒旋转动态重结晶为主。显微特征反映岩石变形温度相当于绿片岩相。利用Fry法测定石英颗粒三维应变应变强度集中在1.35～1.60之间,显示出从北到南逐渐增强的趋势。Flinn指数K和Nadei-Hossack图解均表明应变类型为近似平面应变的拉长型。运动学涡度分析表明米仓山应变以简单剪切变形作用为主,具有由南向北递增趋势。 |
| 关 键 词： | 米仓山 显微构造 应变 涡度 |
STRAIN AND VORTICITY ANALYSIS OF MICANG MOUNTAIN BELT |
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| LI Jin-xi , SUN Dong , LIU Shu-gen , LI Zhi-wu , DENG Bin , TANG Cong , WAN Hong-cheng.STRAIN AND VORTICITY ANALYSIS OF MICANG MOUNTAIN BELT[J].Journal of Mineralogy and Petrology,2012,32(1):48-54. | |
| Authors: | LI Jin-xi SUN Dong LIU Shu-gen LI Zhi-wu DENG Bin TANG Cong WAN Hong-cheng |
| Institution: | 1.College of Geophysics,Chengdu University of Technology,Chengdu 610059,China; 2.Chengdu Center of Hydrogeology and Engineering Geology,Sichuan Bureau of Geology and Mineral Exploration and Development,Chengdu 610081,China; 3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;) |
| Abstract: | The east-west strike thrust fault of Micang Mountain with sinistral strike-slip shear sense has undergone ductile deformation in the west and brittle deformation in the east.Early deformation of NE strike faults is characterized by thrusting form north to south combined with sinistral shearing,dominated by ductile-brittle character,which is superimposed later by brittle deformation.Deformation in Pre-Sinian basement rocks is penetrative,evidenced by occurrence of subgrain and dynamic recrystallization in quartz grains.Microstructural features indicate that the deformation condition is at green schist phase.The measurement of 3 dimension strain of the rocks is from 1.35 to 1.60 by using Fry method for quartz grains,increasing from north to south.Strain pattern of Micang Mountian is stretch ellipse with plane strain determined by Flinn and Nadei-Hossack diagrams.Analysis of kinematic vorticity indicates that simple shear plays main roles in deformation process,which increases from south to north. |
| Keywords: | Micang mountain microtectonics strain vorticity |
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