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Encyclopedia > San Francisco volcanic field
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SP Crater in the field is a cinder cone with a basalt lava flow that extends for 4 miles (6 km)
SP Crater in the field is a cinder cone with a basalt lava flow that extends for 4 miles (6 km)

The San Francisco volcanic field is an area of volcanoes in northern Arizona, USA. The field covers 1800 square miles (4700 km2) the southern boundary of the Colorado Plateau. The field contains 600 volcanoes less than 6 million years old, including Sunset Crater, which erupted less than 1000 years ago. The highest peak in the field is San Francisco Mountain, a stratovolcano near Flagstaff, Arizona, that rises to 12,633 feet of elevation. United States Geological Survey photo of SP Crater in the San Francisco volcanic field, Arizona. ... United States Geological Survey photo of SP Crater in the San Francisco volcanic field, Arizona. ... Jump to: navigation, search A volcano is a geological landform (usually a mountain) where magma (rock of the Earths interior made molten or liquid by extremely high temperatures along with a reduction in pressure and/or the introduction of water or other volatiles) erupts through the surface of the... Jump to: navigation, search State nickname: The Grand Canyon State, The Copper State Other U.S. States Capital Phoenix Largest city Phoenix Governor Janet Napolitano (D) Senators John McCain (R) Jon Kyl (R) Official languages English Only State Area 295,254 km² (6th)  - Land 294,312 km²  - Water 942 km... The Colorado Plateau, also called the Colorado Plateaus Province, is a physiographic region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. ... Sunset Crater is a cinder cone located in Arizona in the United States. ... Jump to: navigation, search Humphreys Peak is the highest point in the U.S. state of Arizona and is located in Coconino County. ... Flagstaff, Arizona Territory. ... Elevation has several related meanings: Geography The elevation of a geographic location is its height above mean sea level (or possibly some other fixed point). ...


The volcanic field seems to have formed from a geological hotspot, a hot area in the mantle. As the North American plate moves over the spot, new volcanoes appear. Thus, the newest volcanoes are at the east side of the field. Most of the volcanoes are basalt cinder cones, but there are dacite domes. In geology, a hotspot is a location on the Earths surface that has experienced active volcanism for a long period of time. ... The North American plate is shown in brown on this map The North American Plate is a continental tectonic plate covering the continent of North America, extending eastward to the Mid-Atlantic Ridge and westward to the Cherskiy Range in East Siberia. ... Basalt Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. ... Cinder Cone is a cinder cone volcano in Lassen Volcanic National Park. ... Gray, red, black, altered white/tan, flow-banded pumice dacite Dacite is a high-silica igneous, volcanic rock. ... St Peters Basilica, Rome A dome is a common structural element of architecture that resembles the hollow upper half of a sphere. ...


The volcanic field is not near San Francisco, California and should not be confused with that city. Jump to: navigation, search The downtown San Francisco skyline, looking east from the central part of the city. ...


External link and source

  • USGS fact sheet about the San Francisco volcanic field.

  Results from FactBites:
 
Planetary Geology Group - Guidebook Background (3233 words)
The crater is formed in basalt flows of the Morman volcanic field and is flanked by cones to the east.
Although the Mormon volcanic field consists predominantly of flat-lying basalt flows, presumably erupted from various fissures, punctuated by basaltic cinder cones, the cone northwest of the lake is a rhyodasite dome dated at 3.1 million years old.
The San Francisco Peaks complex is a composite cone of andesitic to rhyolitic compositions.
AZ Volcanos (598 words)
San Francisco Mountain is the only stratovolcano in the San Francisco Volcanic Field and was built by eruptions between about 1 and 0.4 million years ago.
Sugarloaf Mountain, at the entrance to San Francisco Mountain’s Inner Basin, is a rhyolite lava dome.
Elden Mountain is a steep-sided lava dome in the San Francisco Volcanic Field.
  More results at FactBites »

 
 

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