Textures and Microstructures, Vol. 29, pp. 185-199 Reprints available directly from the publisher Photocopying permitted by license only (C) 1997 OPA (Overseas Publishers Association) Amsterdam B.V. Published inThe Netherlands under license by Gordon and Breach Science Publishers Printed in India TEXTURE ANALYSIS OF QUARTZ IN A GRANITE MYLONITE BY EBSP-ORIENTATION IMAGING MICROSCOPY A. PEARSON, F. HEIDELBACH and H.R. WENK * Department of Geology and Geophysics, University of California, Berkeley, CA 94 720-4 76 7, USA (Received 20 November 1996) The crystallographic preferred orientation (texture) of the quartz phase in a mylonitic leucogranite from the Santa Rosa mylonite zone was investigated using automated analysis of electron backscattering patterns (EBSP) in the scanning electron microscope (SEM). The separation of the quartz diffraction patterns from patterns of other con- stituents (feldspar, mica, etc.) in this polymineralic rock was achieved using an image quality parameter. The quartz phase displays a texture typical for high temperature mylonites (c-axis maximum in the intermediate strain direction). The misorientation distribution between next neighbors is dominated by Dauphin6 twins. Keywords." Quartz; EBSP; Misorientation distribution; Polyphase materials INTRODUCTION The measurement of crystallographic preferred orientation (texture) with bulk diffraction methods is considerably limited for low sym- metry and polyphase materials by the resolution and overlap of dif- fraction peaks. Particularly the texture analysis of polymineralic granitic rocks, which are of great interest to structural geologists, due to their abundance in crystal deformation zones, is complicated by the * Corresponding author. Present address: ESRF, B.P. 220 F-38043 Grenoble, France. 185
TEXTURE ANALYSIS OF QUARTZ IN A GRANITE MYLONITE BY EBSP-ORIENTATION IMAGING MICROSCOPY
Jun 29, 2023
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