Lithologically Controlled

GEOTHERMAL ENERGY

Lithologically Controlled:

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Controlling Structures

List of controlling structures typically associated with geothermal systems:

• Major Normal Fault
• Termination of a Major Normal Fault
• Stepover or Relay Ramp in Normal Fault Zones
• Apex or Salient of Normal Fault
• Fault Intersection

• Accommodation Zone
• Displacement Transfer Zone

• Pull-Apart in Strike-Slip Fault Zone
• Intrusion Margins and Associated Fractures
• Stratigraphic Boundaries
• Fissure Swarms
• Caldera Rim Margins
• Lithologically Controlled

Impermeable lithological layers allow for fluids beneath the surface to be geothermally heated. http://www.energybc.ca/profiles/hightempgeo.html

Hydrothermal fluids may be lithologically controlled as is the case in the Salton Trough region where sandstones often lack cement (due to certain properties of the local hydrothermal fluid) allowing for increased permeability, capped by less porous shales.

Examples

Want to add an example to this list? Select a Geothermal Resource Area to edit its "Controlling Structures" property using the "Edit with Form" option.

CSV

Geothermal Resource Area	Geothermal Region	Tectonic Setting	Host Rock Age	Host Rock Lithology	Mean Capacity	Mean Reservoir Temp
Fenton Hill HDR Geothermal Area	Rio Grande Rift	Extensional Tectonics Rift Zone	Precambrian	Crystalline basement “pCu” (undifferentiated in map units); Biotite Granodiorite (Phase I Reservoir); Gneiss, Schist, Granodiorite, Granite, Metavolcanic Rocks (Phase II Reservoir)	20 MW 20,000 kW 20,000,000 W 20,000,000,000 mW 0.02 GW 2.0e-5 TW	508.15 K 235 °C 455 °F 914.67 °R