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On polygenetic myrmekite

Published online by Cambridge University Press:  01 May 2009

Evan R. Phillips
Evan R. Phillips
Affiliation:
Department of Geology, University of Wollongong, P.O. Box 1144, Wollongong N.S.W. 2500, Australia
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Summary

A brief review of Becke's (1908) replacement and Schwantke's (1909) exsolution models for myrmekite genesis and further consideration of the morphology and spatial distribution of myrmekite as outlined by Phillips (1974) lead to the conclusion that both hypotheses have a place in explaining the origin of myrmekite. The Schwantke model is generallybest applied, for example, to high-level undeformed massive granitoids and the Becke model to deformed metamorphic rocks. The latter hypothesis and a third model involving interaction between exsolution and replacement (Ashworth, 1972) may be used especially to explain the association of muscovite and myrmekite in rocks whose mineral assemblages have undergone retrograde modification, involving either redistribution of Na, Ca and K by local metasomatic reactions among the mineral grains, or metasomatic change of bulk rock composition.

Type
Articles
Information
Geological Magazine , Volume 117 , Issue 1 , January 1980 , pp. 29 - 36
Copyright
Copyright © Cambridge University Press 1980

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