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Journal of the Geological Society; 1993; v. 150; issue.5; p. 897-902;
DOI: 10.1144/gsjgs.150.5.0897
© 1993 Geological Society of London

Papers

Welded breccias in andesite lavas

R. S. J. SPARKS1, M. V. STASIUK1, M. GARDEWEG2 & D. A. SWANSON3

1 Department of Geology, University of Bristol, Bristol BS8 1RJ, UK
2 Servicio Nacional de Geologia y Mineria Chile, Avda. Santa Maria 0104, Casilla 1347, Santiago, Chile
3 US Geological Survey, Department of Geological Sciences, University of Washington, Seattle, Washington, USA

Flow breccias, formed at the margins of blocky andesite lavas, can be reheated, welded and sometimes deformed to form rocks reminiscent of welded pyroclastic rocks. Reheating occurs due to advection of heat from the flow to the basal breccias. Surface breccias also infill extensional crevasses which are later closed and compressed. Strongly deformed welded breccia bands form within the flow levees. The angular breccia clasts can be deformed into fiamme.





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