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Zonal schemes in ancient ignimbrites

Published online by Cambridge University Press:  01 May 2009

Brian E. Lock
Brian E. Lock
Affiliation:
Department of Geology, Rhodes University, P.O. Box 94, Grahamstown, S. Africa
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Summary

Zonal arrangements in ancient ignimbrites have usually been interpreted as a reflection of variations in welding. Detailed study of two Lower Palaeozoic ignimbrites from Newfoundland demonstrates that crystallization zones can also be recognized and that in some cases it is these zones which are responsible for the gross features of the cooling unit.

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Articles
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Geological Magazine , Volume 108 , Issue 2 , May 1971, pp. 103 - 109
Copyright
Copyright © Cambridge University Press 1971

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