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Reconsideration of ‘soda-minettes’

Published online by Cambridge University Press:  05 July 2018

Sharon W. Bachinski
Sharon W. Bachinski*
Affiliation:
Department of Geology, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada
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Abstract

It is shown here that dyke rocks of type localities for ‘soda-minettes’ are not minettes (= lamprophyres dominated by phlogopite and K-rich feldspar). It has long been suggested that ‘soda-minette’ also be applied to otherwise normal minettes from elsewhere that carry modally variable amounts of groundmass aegirine and/or, more commonly, arfvedsonitic to riebeckitic amphibole. Despite the presence of sodic pyriboles, these rocks are poorer in Na2O then minettes lacking these phases. ‘Soda-minette’ is thus misleading and self-contradictory to the many petrologists to whom ‘soda-’ legitimately connotes that the rock in question either has K/Na < 1 and/or is rich in albitic feldspar. To eliminate this ambiguity it is recommended, with the approval of twenty-six other petrologists, that ‘soda-minette’ no longer be used as a rock name. As minettes with Na-pyribole(s) are markedly K-rich and most are both ultrapotassic and peralkaline, independent of the modal abundance of the Na-pyrobile, it is suggested that one of these three chemical characteristics be utilized adjectivally in naming these minettes.

Keywords

minettesoda-minettelamprophyre
Type
Petrology
Information
Mineralogical Magazine , Volume 50 , Issue 356 , June 1986 , pp. 199 - 204
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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Footnotes

*

The editors regret to report the death of Sharon Bachinski on 14 March 1986.

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