Quantitative Constraints on Metamorphism in the Variscides of Southern Brittany--a Complementary Pseudosection Approach |
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| Authors: | JOHNSON, TIM BROWN, MICHAEL |
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| Affiliation: | LABORATORY FOR CRUSTAL PETROLOGY, DEPARTMENT OF GEOLOGY, UNIVERSITY OF MARYLAND, COLLEGE PARK, MD 20742-4211, USA |
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| Abstract: | Previous studies of metapelitic rocks from the core of the southernBrittany metamorphic belt suggest a complex clockwise PTevolution. We use pseudosections calculated for an average subaluminousmetapelite composition in the MnNCKFMASH system and averagePT calculations to investigate in more detail the metamorphicevolution of these rocks. For migmatites, sequential occurrenceof kyanite, kyanite + staurolite and sillimanite suggests thata prograde evolution to P > 8 kbar at T |
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| Keywords: | : melting pseudosections P– T path retrograde metamorphism Variscan |
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