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San Juan volcanic field

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Title: San Juan volcanic field  
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Subject: San Luis Valley, San Juan Mountains, Rio Grande rift, Basin and Range Province, Green River Formation, Volcanic field, David A. Johnston, La Garita Caldera, List of largest volcanic eruptions
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San Juan volcanic field

San Juan volcanic field
San Juan volcanic field
Colorado, USA
Location
Coordinates

37°53′36″N 106°46′28″W / 37.89333°N 106.77444°W / 37.89333; -106.77444Coordinates: 37°53′36″N 106°46′28″W / 37.89333°N 106.77444°W / 37.89333; -106.77444

Geology
Type Volcanic field

The San Juan volcanic field, located in southwestern Colorado, contains two distinct phases of volcanism. The earlier volcanism is Oligocene in age, and consists of largely intermediate composition lavas and breccias. A few ash flow tuffs also constitute this phase of volcanism. Later volcanism is MiocenePliocene in age, and is basaltic in composition. The Oligocene volcanism probably was related to subduction along the western margin of North America, and the Miocene-Pliocene volcanism is best interpreted as a partial melt of the lower crust that was erupted onto the surface.[1]

Notable calderas

  • La Garita Caldera, size: 35 x 75 km.[2]
    • La Garita, North Caldera (Saguache) 37°57′N 106°48′W / 37.95°N 106.8°W / 37.95; -106.8

        • La Garita, Central Caldera 37°45′34″N 106°56′20″W / 37.759316°N 106.938858°W / 37.759316; -106.938858

            • La Garita, South Caldera 37°34′N 107°00′W / 37.56°N 107°W / 37.56; -107

              Name Elevation Coordinates Age
              Cochetopa Caldera - -106.75|region:US_type:mountain name=

              }}[2] ||

              Nelson Mountain Caldera - -106.93|region:US_type:mountain name=

              }}[2] ||

              Bachelor Caldera - -106.912766|region:US_type:mountain name=

              }}[2] ||

              Creede Caldera - -106.938858|region:US_type:mountain name=

              }}[2] ||

              Lake City calderas - -107.384491|region:US_type:mountain name=

              }}[1] ||

              Platoro calderas - -106.530991|region:US_type:mountain name=

              }}[1] ||

              See also

              References

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