Reforma, La

sopka (bez známé erupce za posledních ~12 000 let), Mexico, Eastern Pacific Volcanic Regions

Kde

Mexico, Eastern Pacific Volcanic Regions

Typ (GVP)

Caldera

Nadmořská výška

1 300 m

Poloha

27,508°, -112,392°

The early Pleistocene La Reforma caldera lies along the Gulf of California immediately east of Tres Vírgenes volcano and SE of the late Pleistocene El Aguajito caldera. The roughly 9-km-wide caldera contains basaltic, andesitic, and dacitic lava flows, and rhyolitic lava domes. A prominent arcuate caldera rim extends from La Reforma along the NW coast to near Punta Las Cuevas on the SE coast. The age of the caldera was determined (K-Ar) to be between 1.6 and 1.4 million years old (Ma). A 1.09 +/- 0.11 Ma age was obtained on a ring-fracture lava dome. Andesitic lava flows were erupted on the flanks of the caldera both before and after caldera formation.

Text: Smithsonian Global Volcanism Program.

Údaje o sopce: Smithsonian Global Volcanism Program. Další sopky a průduchy.