The Terrane Boundary Shear Zones provide important information regarding tectonics of juxtaposition between different terranes. In this paper, we have studied the Lakhna shear zone, between the Eastern Ghats Mobile Belt and the Bastar Craton. Detailed structural study, sampling and strain analysis through measurement of size and orientation of dynamically recrystallized quartz grains indicate: (i) the Lakhna shear zone is developed on granitic protolith of the Bastar Craton, (ii) mylonites are quartzofeldspathic in composition, marked by SE dipping mylonitic foliation and down dip stretching lineation defined by biotite and quartz grains, (iii) S-C fabric and rotated porphyroclasts indicate a NW vergence thrust kinematics, (iv) recrystallization of quartz grains occurred by climb-assisted dislocation creep through BLG near craton boundary, SGR in the central part of the shear zone, GBM towards the Eastern Ghats margin, (v) temperature of deformation increases towards mobile belt (380–560°C) that suggests thrusting of granulitic hot slab over cold craton and (vi) W_m estimates of 0.9 suggest simple shear deformation. The juxtaposition between the EGMB and the Bastar Craton occurred by simple shear thrusting when the granulitic slab was hot enough to create a difference in temperature and mechanism of dynamic recrystallization across the shear zone.

地形边界剪切带提供了有关不同地形之间并列构造的重要信息。在本文中，我们研究了东高止山脉活动带和Bastar Craton之间的Lakhna剪切带。通过测量动态再结晶石英晶粒的尺寸和方向进行的详细结构研究，采样和应变分析表明：（i）Lakhna剪切带是在Bastar Craton的花岗岩原生岩上发育的；（ii）镍铁矿的成分为石英长石，标为SE由黑云母和石英颗粒定义的浸入性丝状体叶状构造和向下浸入伸展线，（iii）SC织物和旋转的卟啉体表明是西北偏冲运动学，（iv）爬升辅助的位错蠕变通过克拉通边界附近的BLG引起了石英晶粒的重结晶，W _m估计为0.9表明简单的剪切变形。EGMB和Bastar Craton之间的并置是通过简单的剪切推力实现的，当颗粒平板温度足够高时，会在剪切区内产生温度差异和动态重结晶机制。