Tres Vírgenes
Tres Vírgenes is a complex of volcanoes located in the Mulegé Municipality in the state of Baja California Sur, on the Baja California Peninsula in northwestern Mexico. This Volcano is part of a volcanic ridge that extends from Baja California towards the Guaymas Basin. It is composed of three volcanoes, aligned northeast–southwest, with El Viejo, the oldest, to the northeast, El Azufre in the middle, and the youngest, El Vírgen, to the southwest. El Vírgen, being by far the most conspicuous of the three, is commonly known as "Las Tres Vírgenes". Geological Background Volcán Las Tres Vírgenes is part of a cluster that includes the central vent structure of El Azufre and El Viejo. The off-shore volcanic ridges extend from Tres Vírgenes–Aguajito–La Reforma towards sea-floor spreading centers in the Guayamas basin. It is located within the Gulf of California rift zone. It is a part of a volcanic ridge that extends from the eastern coast of Baja California towards active sea floor spreading in the Guaymas basin. Geologic Structure The ground floor of Las Tres Vírgenes volcano holds the oldest rock in the region which is a granitic rock of the Cretaceous era. Above this intrusive rock layer is a