The influence of crystallographic orientation and grain boundary migration on microstructural and textural evolution in an S-C mylonite

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doi: 10.1016/0040-1951(87)90158-2
Authors:Knipe, R. J.; Law, R. D.
Author Affiliations:Primary:
Univ. Leeds, Dep. Earth Sci., Leeds, United Kingdom
Volume Title:Tectonic and structural processes on a macro-, meso- and micro-scale
Volume Authors:Zwart, H. J., editor; Martens, Magda; van der Molen, I.; Passchier, C. W.; Spiers, C.; Vissers, R. L. M.
Source:Tectonophysics, 135(1-3), p.155-169; International conference on Tectonic and structural processes on a macro-, meso- and micro-scale, Utrecht, Netherlands, April 10-12, 1985, edited by H. J. Zwart, Magda Martens, I. van der Molen, C. W. Passchier, C. Spiers and R. L. M. Vissers. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951
Publication Date:1987
Note:In English. 30 refs.; illus.
Summary:The analysis of the subgrain and dislocation sub-structure present in grains in different crystallographic orientations within a domainal S-C mylonite is reported. The study reveals a range in subgrain size and development which is related to the crystal orientation of the host grain in the mylonite. Subgrains in grains with easy slip orientations contain large subgrains while grains in more complex slip orientations contain small subgrains. The dislocation densities preserved in the mylonite are extremely variable, even within individual subgrains and may be the result of a late stress pulse. The analysis indicates that grain boundary migration was an important process in the microstructural evolution, initiating the selective removal of some orientations and thus influencing the final crystallographic preferred orientation present in different domains. The data collected are also used to assess the potential stability and preservation of microstructures during the non steady-state deformation expected at the end of a deformation event. (Authors' abstract) [A.W.H.]
Subjects:Boundary conditions; Deformation; Effects; Faults; Grains; Metamorphic rocks; Microstructure; Moinian; Mylonites; Neoproterozoic; Precambrian; Preferred orientation; Proterozoic; Structural analysis; Structural geology; Textures; Upper Precambrian; Europe; Great Britain; Moine thrust zone; Northern Highlands; Scotland; United Kingdom; Western Europe; Northwestern Scotland
Abstract Numbers:88M/1465
Record ID:1987062378
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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