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dynamic metamorphism

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

dynamic metamorphism Fragmentation and recrystallization of rocks in narrow zones such as faults or thrusts where strong deformation has occurred. Rocks are ground to a fine powder in the zone of deformation and, because of their fine grain size, recrystallize efficiently under the extreme directional stress and release of frictional heat during deformation. The fine-ground powder recrystallizes to a flinty rock which often surrounds fragments of uncrushed country rock in the deformation zone to form a mylonite. During extreme deformation all the fragments in the deformation zone are ground down to powder and recrystallize to form a finegrained, banded rock known as an ‘ultramylonite’, and rocks can melt to form pseudotachylyte.

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AILSA ALLABY and MICHAEL ALLABY. "dynamic metamorphism." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 22 Dec. 2009 <http://www.encyclopedia.com>.

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