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

Viegas, Gustavo; Menegon, Luca; Archanjo, Carlos

doi:https://doi.org/10.5194/se-7-375-2016

Articles | Volume 7, issue 2

https://doi.org/10.5194/se-7-375-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue:

Deformation mechanisms and ductile strain localization in...

https://doi.org/10.5194/se-7-375-2016

© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

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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Final revised paper (published on 09 Mar 2016)
Preprint (discussion started on 30 Oct 2015)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC C1339: 'Referee comment', Anonymous Referee #1, 12 Nov 2015
RC C1427: 'Referee comment on the manuscript "Brittle grain size reduction of feldspar, phase mixing and strain localization in granitoids at mid-crustal conditions (Pernambuco shear zone, NE Brazil)"', Anonymous Referee #2, 28 Nov 2015
AC C1763: 'Authors' final response', Luca Menegon, 04 Jan 2016

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.