Hello,

In the presence of deformation during syn-kinematic metamorphic reactions, grain size definitely does not always increase. We have studied several examples of this phenomena in granulites of the Athabasca granulite terrane in Saskatchewan that equilibrated at temperatures >750 C and at pressures > 0.9 GPa. I can send you some references as PDFs, if you are interested.

With best regards,

Greg

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Gregory Dumond
Assistant Professor
Department of Geosciences
University of Arkansas
Fayetteville, AR 72701, USA
Email: [log in to unmask]
Web: http://fulbright.uark.edu/departments/geosciences/people/dumond.php

"There is not enough darkness in all the world to put out the light of even one small candle."

--- Robert Alden

From: Metamorphic Studies Group <[log in to unmask]> on behalf of souad guernina <[log in to unmask]>
Sent: Friday, December 4, 2015 8:21 PM
To: [log in to unmask]
Subject: [geo-metamorphism] A simple question

Hello Everyone,

Does grain size always increases with increasing metamorphic grade?

Thank you