San Borja Volcanic Field (Mexico)

Status Unknown Eruption Unknown 1360m
Pyroclastic cone(s) (Rift zone / Continental crust (> 25 km))

The San Borja volcanic field, also known as the El Rosarito volcanic field, is located in central Baja California NE of the Vizcaino Peninsula. Holocene lava flows occur at Rosarito and Morro San Domingo at the western end of the San Borja volcanic field along the coast north of the Vizcaino Peninsula. Some lava flows of the San Borja volcanic field are less vegetated than flows of the San Quintín volcanic field to the north that overlie 5000-6000 year-old midden deposits (Rogers et al., 1985). The Holocene lava flows in the western part of this alkalic volcanic field are of basaltic-andesite and andesitic composition.

The orange-brown ridge in the background is a thick, blocky basaltic-andesite lava flow of probable Holocene age that is part of the San Borja volcanic field. The flow is seen here from state highway 1 in central Baja California. The sparsely vegetated flow is one of many youthful lava flows of the San Borja volcanic field. Holocene lava flows of the San Borja field occur near Rosarito and Morrow San Domingo, at the western end of the San Borja region north of the Vizcaino peninsula.

Photo by Andy Saunders, 1984 (University of Leichester).

Last updated 2019-08-04 00:28:03