Volcán El Chichón, Mexico: Pre-1982 S-rich eruptive activity
Mapping and sampling of the interior of El Chichón Volcano was made possible by the exposures of the 1982 explosion crater. The 1-km-diameter, 200-m-deep crater exposes rocks produced during several eruptive episodes: volcanic domes, talus breccias, plinian airfall deposits and pyroclastic-flow deposits of compositionally similar alkalic hornblende-trachyandesites with phenocrysts of anhydrite. All of the rocks, except those leached of anhydrite, have extremely high S contents. El Chichón consists of a volcanic dome complex, airfall debris, and pyroclastic outflow sheets. Prior to 1982, its last major activity was about 650 ± 100 yr B.P.
Journal of Volcanology and Geothermal Research
Rose, William I.; Bornhorst, Theodore J.; Halsort, S. P.; Capaul, William A.; Plumley, Patrick S.; Cruz-Reyna, Servando Dela; Mena, Manuel; and Mota, Reynaldo, "Volcán El Chichón, Mexico: Pre-1982 S-rich eruptive activity" (2003). Department of Geological and Mining Engineering and Sciences Publications. 141.