Using EBSD data to analyze effect of heat supplied by granite on CPO of quartz in deformed quartzite.

Electron Backscatter Diffraction (EBSD) data of quartz are presented from two quartzite samples of the Lunavada Group (Aravalli Mountain Belt, India). The two samples lie at a distance of 4 km and 30 km from the eastern margin of Godhra granite, which is known to have emplaced syntectonically with late deformation of the Lunavada Group rocks. The sample located away from the granite has weak CPO and fine grain size. Quartz grains in the sample close to the granite are coarse and show strong CPO. It is concluded that heat supplied by the Godhra granite resulted in coarsening of grain size, and dislocation creep was an important deformation mechanism in the sample proximal to the granite. Weak CPO in sample away from granite maybe due to grain boundary sliding, which may have been favoured by the finer grain size of quartz in the sample. [ABSTRACT FROM AUTHOR]