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Granites and a wet convecting ultramafic planenet

Published online by Cambridge University Press:  03 November 2011

W. S. Fyfe
W. S. Fyfe
Affiliation:
Faculty of Science, The University of Western Ontario, London, Ontario, Canada N6A 5B7.
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Abstract

Granites and their associated extrusive rocks are formed in large volumes whenever the continental crust is heated by rising hot mantle, or thickened by collision processes. The complexity of rocks of the granite family is related to the complexity of the continental crust itself and the complexity of processes which lead to thermal perturbations. The light continental crust acts as a density filter which screens out heavy mantle magmas and leads to complex underplating and magma mixing processes. Perhaps the primary cause of crustal melting is the deep recycling of volatiles which are fixed in the oceanic crust before subduction. Modern studies of subduction and collision processes show the large scale and complexity of processes which modify old continental crust.

Keywords

collisiondensity filtrationfaultsgranitemagma-mixingocean ridgesrecyclingstopingsubductionunderplatingvolatileswater-cooling
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 79 , Issue 2-3: The Origin of Granites , 1988 , pp. 339 - 346
Copyright
Copyright © Royal Society of Edinburgh 1988

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