Caldera Rim Margins

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Caldera Rim Margins

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Caldera Rim Margins:
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A conceptual drawing of a caldera derived geothermal system. Hot water from beneath the caldera rises to the surface mainly via faults and fissures that form the caldera rim. Franzson, Hjalti, 2013: General Model of a High-T Reservoir. Iceland Geosurvey (ISOR).

Caldera rims often act as adequate hydrothermal conduits. They are particularly productive when intersected by other faults.

Examples

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CSV
Geothermal
Resource
Area
Geothermal
Region
Tectonic
Setting
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Mori Geothermal Area Kuril-Kamchatka Arc Subduction Zone Pre-Tertiary Limestone 50 MW50,000 kW
50,000,000 W
50,000,000,000 mW
0.05 GW
5.0e-5 TW
513.15 K240 °C
464 °F
923.67 °R
Valles Caldera - Redondo Geothermal Area Rio Grande Rift Rift Zone
Extensional Tectonics
Mississippian-Pennsylvanian; Pleistocene, 1.6 to 1.25 Ma Limestone-Madera Formation “MIPu”; Rhyolitic tuff-Intracaldera Bandelier Tuff (upper Tshirege “Qbt” and lower Otowi “Qbo” members); Caldera Fill Rhyolite (shallow)
Valles Caldera - Sulphur Springs Geothermal Area Rio Grande Rift Rift Zone
Extensional Tectonics
Precambrian; Mississippian-Pennsylvanian; Pleistocene, 1.6 to 1.25 Ma; Pliocene; Miocene Crystalline basement “pCu”; Limestone-Madera Formation “MIPu”; Rhyolitic tuff-Bandelier Tuff (upper Tshirege “Qbt” and lower Otowi “Qbo” members); Caldera Fill Rhyolite (shallow); Dacitic/Andesitic to Rhyolitic lavas and tuffs-Keres Group Volcanics (shallow); Santa Fe Group volcaniclastics “Tsf”

References