San Juan volcanic field
| San Juan volcanic field | |
|---|---|
 San Juan volcanic field
Location in Colorado
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| Highest point | |
| Coordinates | Lua error in package.lua at line 80: module 'strict' not found. |
| Geography | |
| Location | Colorado, United States |
| Geology | |
| Mountain type | Volcanic field |
The San Juan volcanic field, in southwestern Colorado, contains two 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. It probably was related to subduction along the western margin of North America.
The later volcanism is Miocene–Pliocene in age, and is basaltic in composition. It 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) Lua error in package.lua at line 80: module 'strict' not found.
- La Garita, Central Caldera Lua error in package.lua at line 80: module 'strict' not found.
- La Garita, South Caldera Lua error in package.lua at line 80: module 'strict' not found.
| Name | Elevation | Coordinates | Age |
| Cochetopa Caldera | - | Lua error in package.lua at line 80: module 'strict' not found.[2] | |
| Nelson Mountain Caldera | - | Lua error in package.lua at line 80: module 'strict' not found.[2] | |
| Bachelor Caldera | - | Lua error in package.lua at line 80: module 'strict' not found.[2] | |
| Creede Caldera | - | Lua error in package.lua at line 80: module 'strict' not found.[2] | |
| Lake City calderas | - | Lua error in package.lua at line 80: module 'strict' not found.[1] | |
| Platoro calderas | - | Lua error in package.lua at line 80: module 'strict' not found.[1] |
See also
References
- ↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 Lua error in package.lua at line 80: module 'strict' not found.
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