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It has been suggested that mantle plumes underlie the mouth of the Gulf of California and the Mexican volcanic belt (Figure 1). Rifting began in the Gulf around 5.5 Ma with seafloor spreading beginning around 3.5 Ma. The notion of a Gulf Mouth hotspot derives from models that propose plumes to be the cause of continental break-up.
Volcan de las Tres Virgenes (the volcano of the 3 virgins) is a volcano in a strange place for volcanoes. Early missionary reports contain a reference to an eruption in 1746 that was not actually witnessed. Volcan de las Tres Virgenes is the only historically active volcano on the Baja peninsula, and may have developed on a "leaky" transform fault rather than due to subduction. Presently Tres Virgenes is the site of geothermal development.
It is located near the E coast of Baja California, a region not usually noted for being volcanic. Volcan de las 3 Virgenes erupted last in the late 1700's. This photo has been annotated to show you that volcanoes are almost always made up of the products of many different eruptions, and even if they look like nice simple cones, they are actually quite complicated. Volcan de las 3 Virgenes has erupted a remarkable variety of lava types, namely basalt, andesite, and dacite.
Originally posted by Ptolomeo
Could Tres Virgenes be connected with this unnamed volcano?
...So what are the chief characterisics of basalt, andesite and dacite?
Originally posted by Valhall
...would be a precursor to a major quake in San Francisco. These are getting closer!