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The Delaney Dome Formation, Connemara, W. Ireland, and the geochemical distinction of ortho- and para-quartzofeldspathic rocks

Published online by Cambridge University Press:  05 July 2018

Bernard Elgey Leake  and
Dharm Singh
Bernard Elgey Leake
Affiliation:
Department of Geology, University of Glasgow, Glasgow G12 8QQ; also Department of Geology, University of Western Australia, Nedlands, WA 6009
Dharm Singh
Affiliation:
Department of Geology, University of Glasgow, Glasgow G12 8QQ
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Abstract

A number of geochemical plots are suggested by means of which metamorphosed quartzofeldspathic sedimentary rocks (meta-sandstones, meta-arkoses, quartzites, etc.) can be distinguished from their metamorphosed igneous mineralogical analogues (metarhyolite, meta-granite, etc.). These plots are applied to an enigmatic, partly mylonitized, quartzofeldspathic series, the Delaney Dome Formation, which is involved in a major thrust zone. The formation is shown to be igneous and is probably a meta-rhyolite. The plots proposed should have general application in identifying the precursors of both high-grade and low-grade quartzofeldspathic rocks of unknown origin.

Keywords

meta-rhyolitequartzofeldspathic rocksDelaney Dome FormationIreland
Type
Petrology
Information
Mineralogical Magazine , Volume 50 , Issue 356 , June 1986 , pp. 205 - 215
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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