Development of quartz ribbons in quartzofeldspathic granulites |
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Authors: | Nibir Manual Kiyoshi Fujino Susanta K Samanta |
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Institution: | (1) Department of Geological Sciences, Jadavpur University, 700 032 Calcutta, India;(2) Department of Earth and Planetary Sciences, Hokkaido University, 060 Sapporo, Japan |
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Abstract: | In high-grade (granulite facies) quartzofeldspathic rocks the progressive development of a fabric records contrasting deformation
behaviour of quartz and feldspar. Feldspar has undergone deformation mainly by recrystallization-accommodated dislocation
creep and produced smaller recrystallized grains progressively in the course of deformation. Quartz has not deformed solely
by dislocation creep but also by a diffusion-controlled mechanism. Dislocation climb is important in the dislocation creep
of quartz. In contrast to feldspar, quartz grains have not recrystallized into smaller grains at any stage of deformation.
Rather, they have transformed initially to short monocrystalline ribbons and ultimately to long polycrystalline ribbons. This
textural change of quartz is a continuous process and has taken place in the course of bulk textural change of the rocks during
the deformation. |
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Keywords: | Quartz ribbons deformation dislocations recrystallization |
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