内蒙古察右后旗三道沟一带韧性剪切带磁组构特征及其构造意义  

Magnetic fabric features of the ductile shear zone in Sandaogou area of Inner Mongolia and their tectonic significance

作　　者：黄俊[1] 鲁如魁[1,2] 褚志安 张永强[4] 

机构地区：[1]安徽省地质调查院,安徽合肥230001 [2]西北大学地质学系大陆动力学国家重点实验室,陕西西安710069 [3]陕西地勘局第六地质队,陕西临潼710060 [4]中国黄金集团公司李子金矿有限公司,甘肃天水741005

出　　处：《中国地质》2011年第3期544-552,共9页Geology in China

基　　金：内蒙古自治区地质勘查项目"1:5万内蒙古自治区察右后旗袁家房子等四幅矿产地质调查"资助

摘　　要：变形岩石的磁组构参数K1、K2、K3、P、T、F、L、E等可以用来定量地分析和了解构造变形的性状。笔者对分布于察哈尔右翼后旗三道沟一带的构造岩进行磁组构特征研究发现:E值多大于1,或接近于1;T值大于0的明显多于小于0的;P值均大于1,而以F和L的对数值为轴所作的变型弗林图解中数据主要集中在剪切区和压扁区。上述结果表明磁化率椭球体主要表现为磁面理较磁线理发育的压扁型椭球体,三道沟一带韧性剪切带的构造岩石经历了力学机制为挤压剪切的强烈构造活动。这种由磁组构揭示的应力应变特征得到了野外露头及显微构造的佐证。The parameters of magnetic fabrics of deformed rocks such as Kmax,Kint,Kmin,P,T,F,L and E can be used to quantitatively display the behaviors of tectonic deformation.Characteristics of magnetic fabrics of the ductile shear zone in Sandaogou area of Inner Mongolia were analyzed in this study.The results show that most E values are larger than or close to 1;T values larger than 0 are more than those smaller than 0;P values are larger than 1,and the data in graphic variant Flinn of the L-F parameters of magnetic fabrics are concentrated in the shear zone and the compression zone.It is indicated that the magnetic susceptibility ellipsoid mainly finds expression in flatted ball ellipsoid whose foliation is more developed than lineation.The rocks in Sandaogou ductile shear zone experienced a strong tectonic activity of extrusion shear mechanical mechanism.The stress,strain and deformation characteristics are consistent with field features and microstructure.

关 键 词：磁组构 三道沟韧性剪切带 临河-集宁断裂 

分 类 号：P584[天文地球—岩石学]