Recrystallization and peristerite formation in albite |
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| Authors: | D B Marshall C J L Wilson |
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| Institution: | (1) Department of Physics, Monash University, 3168 Clayton, Victoria, Australia;(2) School of Earth Sciences, University of Melbourne, 3052 Parkville, Victoria, Australia;(3) Present address: School of Physics, University of New South Wales, 2033 Kensington, N.S.W., Australia |
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| Abstract: | Plagioclase in the range An2-An10 in a relatively undeformed Quartz—feldspar pegmatite is compared with similar material in a strongly deformed and recrystallized shear zone. Optical and transmission electron microscope observations and chemical data are discussed in terms of established mechanisms of strain induced recrystallization.Recrystallization occurs by the formation of subgrains from recovery, and their subsequent growth by boundary migration or coalescence by rotation. It is suggested that the recrystallization and grain growth are enhanced by a small increase in the anorthite content. Peristerite formation in the recrystallized grains is associated with the migration of high angle boundaries under upper greenschist facies conditions. |
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