What is the proto-lithology of this metamorphic rock?

Reply Mon 20 Apr, 2015 09:03 pm
I have a metamorphic rock that is mylonitic in texture and constists of what I believe to be sanidine and muscovite. How can I tell the proto-lithology of this rock?
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Reply Tue 21 Apr, 2015 05:15 am
. Do you have the outcrop availablle? I think seeing this in the field may show you whether its a ontct metamorphic or igneous country rock

Usually that admix of sanidine and mucovite is a blueschist facies rock, so Id be looking for associates in thin section,(look for magnetite or other heavy) They usually lie along the pre metamorphic fbric.

So Id be looking at the microfabric in hand and under the scope. Then, Id do an oriented thin section.
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