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Welded Tuffs in the Borrowdale Volcanic Series, English Lake District, with a Note on Similar Rocks in Wales

Published online by Cambridge University Press:  01 May 2009

R. L. Oliver
R. L. Oliver
Affiliation:
Department of Mineralogy and Petrology, Cambridge.
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Abstract

Compact “streaky” rocks, from the Borrowdale Volcanic Series, English Lake District, are diagnosed in part as welded tuffs. Original glass is completely replaced, but similarity to welded tuffs elsewhere is shown by the dacitic-rhyodacitic composition, lack of bedding, and development of columnar jointing. The deposition of welded tuffs, as nuée ardentes, or incandescent tuff flows, is discussed.

Type
Articles
Information
Geological Magazine , Volume 91 , Issue 6 , December 1954 , pp. 473 - 483
Copyright
Copyright © Cambridge University Press 1954

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