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The origin of scoriaceous rock associated with dacitic ignimbrite in the Mirannie-Mount-Rivers district, New South Wales, Australia

Published online by Cambridge University Press:  05 July 2018

Beryl Nashar  and
Noel C. White
Beryl Nashar
Affiliation:
Department of Geology, The University of Newcastle, N.S.W., and Broken Hill Proprietary Co. Ltd., Australia
Noel C. White
Affiliation:
Department of Geology, The University of Newcastle, N.S.W., and Broken Hill Proprietary Co. Ltd., Australia
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Summary

From field and petrographic evidence, some scoriaceous rock from the upper ignimbrite horizon of the Mount Rivers Volcanic Member of the Carboniferous Dyrring Formation in the Mirannie-Mount-Rivers District, New South Wales, Australia, is believed to have a recent origin.

By heating unaltered dacitic ignimbrite in a furnace it was possible to produce in the temperature range 600-1230°C changes in the rock similar to those observed in specimens of scoria collected in the field. Thus a temperature range for the alterations was established. Two possible sources of heat axe suggested as being responsible for the production of the scoriaceous rock, namely a bush fire and a lightning strike, with a preference for the former.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 315 , September 1976 , pp. 781 - 786
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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References

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