Datil-Mogollon Volcanic Field


Location: 32° 00' to 34° 30' N, 106° 30' to 109° 00' W, Socorro County
Type: Field of ash-flow calderas and associated volcanic rocks
Age: Mid-Tertiary; 36 Ma to 24 Ma
Significance:

A collection of giant calderas ("super volcanoes") from the beginning of New Mexico's "Age of Volcanoes".


Composition:

Rhyolite, quartz latite



 

These are older volcanoes and volcanic rocks dating from the Neogene.  They represent part of the great ignimbrite flare-up that occurred throughout the Southwest at this time.  Many of these eruptions resulted in large calderas similar to the modern Vallis Caldera.  However, 20 to 35 million years of erosion and faulting have erased most of the morphology of large calderas.  Today this area is dominated by masssive cliffs of ash flow tuffs and exposures of shallow batholiths consisting of granitic and intermediate volcanic rocks.°

Map showing the principal super volcanoes (large calderas) in relation to modern relief in southwestern New Mexico. Note that the Gila Wilderness is probably a wildernes because the underlying geology is so "wild."

 

Cross section and state of preservation of an idealized Datil-Mogollon supervolcano

-Concept: a Valles Caldera chopped up by Basin and Range like faulting

 

 

 


View Datl-Mogollon Volcanic Field in a larger map

  


All text and photo credit due to Dr. Larry Crumpler, New Mexico Museum of Natural History and Science


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