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Granite: Some Tectonic, Petrological, and Physico-Chemical Aspects

Published online by Cambridge University Press:  01 May 2009

Doris L. Reynolds
Doris L. Reynolds
Affiliation:
Grant Institute of Geology, West Mains Road, Edinburgh, 9.
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Abstract

Granites of the main movement-phase of an orogenic zone form an integral part of the tectonic pattern being characteristically located at the intersection of cross- and main-folds. Here, an older granitic core pierces upwards through the anticlinal vault to form a diapir-fold in which migmatization, synchronous with movement, leads to the evolution of granodiorite. At higher structural levels where pressure is lower K-granites occur. Only at sub-volcanic levels has evidence of melting been found.

Recent hydrothermal investigations, by Bowen and Tuttle, show that synthetic haplo-pitchstones which begin to crystallize at minimum temperatures become richer in K as pressure decreases. These results are closely comparable with evidence provided by the sub-volcanic K-microgranites (migmatized Caledonian granodiorite) of Slieve Gullion, but have no application to the granodiorites.

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Geological Magazine , Volume 95 , Issue 5 , October 1958, pp. 378 - 396
Copyright
Copyright © Cambridge University Press 1958

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