滇西澜沧江左旋走滑挤压带应变分解的应变和运动学涡度证据

被引:15
作者
张波 [1 ]
张进江 [2 ]
钟大赉 [1 ]
郭磊 [2 ]
机构
[1] 中国科学院地质与地球物理研究所,岩石圈演化国家重点实验室
[2] 北京大学地质系,造山带与地壳演化教育部重点实验室
关键词
应变; 运动学涡度; 走滑挤压应变; 应变分解; 澜沧江剪切带;
D O I
暂无
中图分类号
P542 [构造运动];
学科分类号
摘要
集中于青藏高原东南缘澜沧江走滑挤压带应变路径与应变分解关系的探讨,该剪切带出露各类型韧性变形岩石,为有限应变、运动学涡度值和单剪-纯剪组分比率的定量化分析提供地质条件.平均运动学涡度值的估算基于3种传统方法,即Rs-θ法、碎斑双曲线分布法和极摩尔圆法;计算结果表明低级片岩带内的糜棱岩化变质沉积岩平均运动学涡度为0.19~0.54,高级片麻岩带的初糜棱岩、糜棱岩和超糜棱岩的运动学涡度值分别为0.19~0.73,0.11~0.8和0.84~0.95(甚至高达0.99).利用经典应变分析方法和运动学涡度值估算结果一致暗示澜沧江剪切带总体为单斜对称应变.结合运动学路径,该剪切带可以被厘定为典型的走滑挤压应变带、且发生了应变分解.根据区域构造背景,青藏高原东南缘展布的这些新生代陡立而狭窄的大型韧性剪切带是调节陆内变形过程中简单剪切组分的重要地质载体,而纯剪切组分则分解在构造带外侧更宽阔的地体上.
引用
收藏
页码:1268 / 1283
页数:16
相关论文
共 16 条
[1]   造山带岩石层多向层架构造及其对新生代岩浆活动制约──以三江及邻区为例 [J].
钟大赉 ;
丁林 ;
刘福田 ;
刘建华 ;
张进江 ;
季建清 ;
陈辉 .
中国科学:地球科学, 2000, (S1) :1-8
[2]   Testing the utility of the porphyroclast hyperbolic distribution method of kinematic vorticity analysis [J].
Forte, Adam M. ;
Bailey, Christopher M. .
JOURNAL OF STRUCTURAL GEOLOGY, 2007, 29 (06) :983-1001
[3]   Importance of differentiating ductile slickenside striations from stretching lineations and variation of shear direction across a high-strain zone [J].
Lin, Shoufa ;
Jiang, Dazhi ;
Williams, Paul F. .
JOURNAL OF STRUCTURAL GEOLOGY, 2007, 29 (05) :850-862
[4]  
Yuejun Wang,Weiming Fan,Yanhua Zhang,Touping Peng,Xinyue Chen,Yigang Xu.Kinematics and 40 Ar/ 39 Ar geochronology of the Gaoligong and Chongshan shear systems, western Yunnan, China: Implications for early Oligocene tectonic extrusion of SE Asia[J].Tectonophysics,2006(3)
[5]   Reference frame, angular momentum, and porphyroblast rotation [J].
Jiang, DZ ;
Williams, PF .
JOURNAL OF STRUCTURAL GEOLOGY, 2004, 26 (12) :2211-2224
[6]  
Guillaume Bertrand,Claude Rangin.Tectonics of the western margin of the Shan plateau (central Myanmar): implication for the India–Indochina oblique convergence since the Oligocene[J].Journal of Asian Earth Sciences,2003(10)
[7]  
Christopher M Bailey,Eleanor L Eyster.General shear deformation in the Pinale?o Mountains metamorphic core complex, Arizona[J].Journal of Structural Geology,2003(11)
[8]   Kinematic vorticity and strain rate patterns associated with ductile extrusion in the Chelmos Shear Zone (External Hellenides, Greece) [J].
Xypolias, P ;
Koukouvelas, IK .
TECTONOPHYSICS, 2001, 338 (01) :59-77
[9]   An estimate of kinematic vorticity from rotated elongate porphyroblasts [J].
Beam, EC ;
Fisher, DM .
JOURNAL OF STRUCTURAL GEOLOGY, 1999, 21 (11) :1553-1559
[10]   Monoclinic model shear zones [J].
Passchier, CW .
JOURNAL OF STRUCTURAL GEOLOGY, 1998, 20 (08) :1121-1137