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GSA Memoirs
Proterozoic Geology: Selected Papers from an International Proterozoic Symposium
Author(s)
Copyright:
© 1983 Geological Society of America
Geological Society of America
Geological Society of America

Volume
161
ISBN print:
9780813711614
Publication date:
January 01, 1983
Book Chapter
Metamorphism and thermal gradients in the Proterozoic continental crust
Author(s)
-
Published:January 01, 1983
There is no simple relationship between a PT point derived for a metamorphic complex from mineral assemblage and composition data and the equilibrium geotherm which may be calculated for the crust. Transient or complex geotherms of various slopes may be generated by magmatic intrusion, rapid burial, rapid uplift or tectonic thickening, or almost any combination of these processes. Proterozoic metamorphic complexes yield PT conditions ranging from about 6 kb, 600° in the Wakeham Bay area to 3-5 kb, 750° in the Bear Province and 10 kb, 980° in the Musgrave Ranges. The lowest apparent geotherms lie in linear metamorphic belts,...
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