Dynamic Metamorphism

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This isn't in the notes and I don't even know if we need to know this. In another class we discussed Dynamic Metamorphism and I was just wondering what it was and if we needed it for our class?

-- Amanda Fields (fields@oswego.edu), April 03, 2001


You are responsible for dynamic metamorphism and all the other kinds of metamorphism in your notes. Read Eric's answer to your question below.

-- Sharon Gabel (gabel@oswego.edu), April 03, 2001.

Dynamic metamorphism is metamorphism of rock masses caused primarily by stresses that yield relatively high strain (deformation) rates. More simply, it is metamorphism resulting from deformation. The deformation may be dominantly brittle, in which case rock and mineral grains are broken and crushed, or it may be dominantly ductile, in which case plastic behavior and flow occur via structural changes within and between grains.' Temperatures during dynamic metamorphism are typically elevated and may be caused by the deformation process. Fluids commonly contribute to the metamorphic process, both by altering chemistry and by aiding recrystallization.

Both local and regional dynamic metamorphism are recognized. At the local scale, in narrow zones from less than 1 cm to several meters wide, brittle or ductile deformation along faults and fold limbs causes rock to break, recrystallize, and even to melt. Similarly, both brittle and ductile deformation, as well as melting, occur during impacts of extraterrestrial bodies. Brittle and ductile deformation processes also operate at the regional scale.

The rocks produced at all scales by dynamic metamorphism are rocks composed of fragments of preexisting material (porphyroclasts), surrounded by a deformed matrix, the texture or mineral composition of which was produced by metamorphic processes. Such rocks, which fit into the broad category of clastic rocks, referred to as dynamoblastic rocks

Taken from: http://geology.csupomona.edu/alert/metamorphic/dynamic.htm

I am not sure if we are resposible this information. You would have to ask Dr. Gabel

-- Eric Breindel (breindel@oswego.edu), April 03, 2001.

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