Articles | Volume 9, issue 6
https://doi.org/10.5194/se-9-1399-2018
https://doi.org/10.5194/se-9-1399-2018
Research article
 | 
10 Dec 2018
Research article |  | 10 Dec 2018

Myrmekite and strain weakening in granitoid mylonites

Alberto Ceccato, Luca Menegon, Giorgio Pennacchioni, and Luiz Fernando Grafulha Morales

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Latest update: 16 Jun 2024
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Short summary
Metamorphic fine-grained reaction products make continental crust rocks weaker. Microstructural processes related to the transformation of strong K-feldspar into weak aggregates of plagioclase and quartz during crustal deformation have been investigated through electron microscopy. Rheological calculations show that the occurrence of even small amounts of weak aggregates, whose deformation is mainly diffusion-assisted, would lead to a decrease in rock viscosity of several orders of magnitude.