Type C: Caldera Resource

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Type C: Caldera Resource

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Type C: Caldera Resource:
No definition has been provided for this term.


Caldera resources may be found in many tectonic settings but are defined by their caldera structures which control the flow of the fluids in the system.

Examples of caldera resources include those at Medicine Lake, Valles Caldera, Los Humeros, and Yellowstone.

According to Brophy, caldera resources typically have the following properties:

  • Topography – Ring fractures, often rugged, with gentle floor topography
  • Climate – Variable
  • Depth to resource – Moderate to shallow (<2500m)
  • Surface manifestations - Common
  • Permeability – Low fracture permeability – often think tuff units







Examples

Want to add an example to this list? Select a Geothermal Resource Area to edit its "Brophy Model" property using the "Edit with Form" button.

CSV
Geothermal
Resource
Area
Geothermal
Region
Control
Structure
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Amatitlan Geothermal Area Central American Volcanic Arc Chain 25 MW25,000 kW
25,000,000 W
25,000,000,000 mW
0.025 GW
2.5e-5 TW
513.15 K240 °C
464 °F
923.67 °R
Fenton Hill HDR Geothermal Area Rio Grande Rift Lithologically Controlled Precambrian Crystalline basement “pCu” (undifferentiated in map units); Biotite Granodiorite (Phase I Reservoir); Gneiss, Schist, Granodiorite, Granite, Metavolcanic Rocks (Phase II Reservoir) 20 MW20,000 kW
20,000,000 W
20,000,000,000 mW
0.02 GW
2.0e-5 TW
508.15 K235 °C
455 °F
914.67 °R
La Primavera Geothermal Area Transmexican Volcanic Belt Tertiary Andesite 25 MW25,000 kW
25,000,000 W
25,000,000,000 mW
0.025 GW
2.5e-5 TW
527.15 K254 °C
489.2 °F
948.87 °R
Lahendong Geothermal Area Minahasa Volcanic Zone Fault Intersection Miocene Andesite 80 MW80,000 kW
80,000,000 W
80,000,000,000 mW
0.08 GW
8.0e-5 TW
578.15 K305 °C
581 °F
1,040.67 °R
Lihir Geothermal Area Papua New Guinea Geothermal Region Basalt; Breccias; Tuffs 56 MW56,000 kW
56,000,000 W
56,000,000,000 mW
0.056 GW
5.6e-5 TW
548.15 K275 °C
527 °F
986.67 °R
Long Valley Caldera Geothermal Area Walker-Lane Transition Zone Displacement Transfer Zone Quaternary Bishop Tuff, Metamorphic Basement 38 MW38,000 kW
38,000,000 W
38,000,000,000 mW
0.038 GW
3.8e-5 TW
513.15 K240 °C
464 °F
923.67 °R
Sumatra-Sibayak Geothermal Area Sunda Volcanic Arc - Great Sumatra Fault Zone Fault Intersection Tertiary Sandstone; Limestone 12 MW12,000 kW
12,000,000 W
12,000,000,000 mW
0.012 GW
1.2e-5 TW
543.15 K270 °C
518 °F
977.67 °R
Valles Caldera - Redondo Geothermal Area Rio Grande Rift Fault Intersection
Stratigraphic Boundaries
Caldera Rim Margins
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 Fault Intersection
Stratigraphic Boundaries
Caldera Rim Margins
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”
Zunil Geothermal Area Central American Volcanic Arc Chain Granite; Volcanics 28 MW28,000 kW
28,000,000 W
28,000,000,000 mW
0.028 GW
2.8e-5 TW
532.15 K259 °C
498.2 °F
957.87 °R

References

  1. Colin F. Williams, Marshall J. Reed and Arlene F. Anderson. 2011. Updating the Classification of Geothermal Resources - Presentation. In: Thirty-Sixth Workshop on Geothermal Reservoir Engineering; 2011/02/02; Stanford, California. Stanford, California: Stanford University; p. 23