The development of grain boundary orientation distribution in quartz.
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2013
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Resumo
The fabric of high-angle boundaries in recrystallized quartz aggregates deformed under distinct strain and metamorphic
conditions has been investigated in samples from iron formations recrystallized under lower greenschist to lower amphibolite facies
conditions. Orientation of grain boundaries was measured using U-stage, while crystallographic fabric and misorientation between
grains were measured using EBSD. In domains where grains were recrystallized under lower greenschist facies conditions, grain
boundaries are sutured, composed of several small straight segments, whose traces can be parallel to traces of any crystallographic
plane. In contrast, in domains of upper-greenschist–lower-amphibolite facies, grain boundaries are predominantly composed of long
straight segments and belong to girdle of rhombohedral planes, while segments within girdle of basal or prism planes are rare. The
longest segments (larger than 270 mm) are commonly within girdle of rhombohedral planes for the two grains that share a boundary
surface, possibly representing Dauphine´ twin boundaries. Under higher temperature condition of the lower amphibolite facies
(500–550 C), boundary segments are longer and tend to represent coincident crystallographic orientations for the two grains that
share a boundary.
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High-angle boundary, Dauphine twinning, Quartz crystallographic orientation, Universal stage
Citação
GONÇALVES, C. P. de C.; LAGOEIRO, L. E. The development of grain boundary orientation distribution in quartz. European Journal of Mineralogy, v. 25, p. 385-404, 2013. Disponível em: <https://www.schweizerbart.de/papers/ejm/detail/25/80861/The_development_of_grain_boundary_orientation_distribution_in_quartz>. Acesso em: 20 de jun. 2017.