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Myrmekite and muscovite developed by retrograde metamorphism at Broken Hill, New South Wales

Published online by Cambridge University Press:  05 July 2018

Evan R. Phillips ,
D. M. Ransom  and
R. H. Vernon
Evan R. Phillips
Affiliation:
Department of Geology, Wollongong University College, Wollongong, N.S.W.
D. M. Ransom
Affiliation:
Central Pacific Minerals N.L., Sydney, N.S.W.
R. H. Vernon
Affiliation:
School of Earth Sciences, Macquarie University, Sydney, N.S.W.
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Summary

Retrograde metamorphism of gneisses and pegmatites leads in part to the destruction of feldspar and its replacement by late-stage lobate myrmekite and muscovite. Reactions promoted by retrogression suggest a range in volume of quartz production that may supplement that developed by exsolution and lead to deviations from the strict proportionality relationship suggested by previous workers. There is no need, however, to propose that quartz in myrmekite originates by constriction of pre-existing quartz within exsolved albite.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 297 , March 1972 , pp. 570 - 578
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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