Articles | Volume 7, issue 2
Research article
09 Mar 2016
Research article |  | 09 Mar 2016

Brittle grain-size reduction of feldspar, phase mixing and strain localization in granitoids at mid-crustal conditions (Pernambuco shear zone, NE Brazil)

Gustavo Viegas, Luca Menegon, and Carlos Archanjo


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Short summary
This paper presents microstructural and chemical data of mylonitic granitoids deformed at the brittle-ductile transition in the continental crust. Through a combination of microstructures, chemical analyses and modelling of the strength of constituent phases, we were able to show that strain localisation in shear zones may be triggered primarily by brittle failure, without the need for reaction-softening mechanisms promoted by metamorphic fluids.