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The document summarizes volcanic evidence from two volcanoes, Sumaco and El Reventador, in the Ecuadorian Subandean Zone. Sumaco volcano features alkaline shoshonitic lavas enriched in incompatible elements, suggesting low degrees of partial melting. El Reventador features adakitic andesites and dacites indicating melting of subducted oceanic lithosphere. Trace element data shows Sumaco lavas have the highest incompatible element concentrations. The volcanoes mark a tectonic boundary, with El Reventador abo

Author

Roberto Pulupa

Language

EN