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Gas pipes in Eocambrian volcanic breccias

Published online by Cambridge University Press:  01 May 2009

H. J. Duyverman  and
M. J. Roobol
H. J. Duyverman
Affiliation:
Department of Earth Sciences, The Open University, Walton Hall Milton Keynes MK7 6AA, U.K.
M. J. Roobol
Affiliation:
Faculty of Earth Sciences, King Abdul Aziz University, P.O. Box 1744 Jeddah, Saudi Arabia
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Summary

Eocambrian volcanic breccias of angular dacite and andesite clasts at Wadi Fatima, Kingdom of Saudi Arabia, contain perfectly preserved gas pipe structures. Only the latter identify them as lithic-rich, pyroclastic flow breccias of Pelean type. Without the gas pipes it would not be possible to identify them as pyroclastic and different from epiclastic breccias originating as mudflows, lahars or avalanches. The pyroclastic flow breccias constitute a minor component of the volcanic Fatima Group dominated by pumiceous water deposited sediments and subaerial welded tuffs.

Type
Articles
Information
Geological Magazine , Volume 118 , Issue 3 , May 1981 , pp. 265 - 270
Copyright
Copyright © Cambridge University Press 1981

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