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Messico · Campo vulcanico

Comondu-La Purisima

Tipo
Campo vulcanico
Altitudine
780 m
Ultima eruzione
Sconosciuto
A young scoria cone rises above cactus-covered terrain NE of the town of La Purísima. The Comondú-La Purísima volcanic field, located in southern Baja California, west of the Sierra de la Giganta, has been active from the Miocene to the Quaternary. The youngest lava flows are mostly located in the area between the Comondú and La Purísima rivers.
A young scoria cone rises above cactus-covered terrain NE of the town of La Purísima. The Comondú-La Purísima volcanic field, located in southern Baja California, west of the Sierra de la Giganta, has been active from the Miocene to the Quaternary. The youngest lava flows are mostly located in the area between the Comondú and La Purísima rivers. · Foto: Photo by Brian Hausback, 1983 (California State University, Sacramento).
Tipo
Campo vulcanico
Paese
Messico
Regione
Pacifico orientale / Gulf of California Rift Volcanic Province
Altitudine
780 m
Coordinate
26.000, -111.920
Ultima eruzione
Sconosciuto
Contesto tettonico
Zona di rift / Crosta continentale (> 25 km)
Forma vulcanica
Gruppo vulcanico
Roccia principale
Trachiandesite / Trachiandesite basaltica
Sintesi geologica

The Comondú-La Purísima volcanic field, located in southern Baja California, west of the Sierra de la Giganta, dates back to the Miocene. However, the youthful morphology of some cinder cones suggested possible Holocene ages (Sawlan, 1991). The youngest lavas form blocky flows with flow ridges and are mostly located in the area between Comondú and the La Purísima river. Vents usually occur along NNW-trending faults, and many lava flows are offset, sometimes repeatedly, along grabens. Both basaltic and andesitic lava flows are present. The former are typically 5-10 m thick, and the latter are up to 60-80 m thick and form dense, glassy flows with subhorizontal fractures.

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