Abstract
Sources of large-volume ignimbrites in the Central Andes are difficult to identify by conventional means. MSS band 7 LANDSAT imagery of the region was obtained with the specific objective of using the synoptic view to identify large ignimbrites and their sources. Two are described. The Guataquina ignimbrite covers some 2300 km 2 and probably has a volume of some 70 km 3. It appears to have a source in Cerro Guacha, a complex caldera-graben structure 25 km across. The Cerro Galan ignimbrite covers an area of some 2000 km' on the flanks of a major resurgent caldera some 30 km by 20 km across. Younger volcanic rocks have been erupted from two points on the caldera wall, and the structure appears to have had a geological history broadly similar to that of the Valles caldera.
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