Intrusion Margins and Associated Fractures

GEOTHERMAL ENERGY

Intrusion Margins and Associated Fractures

Intrusion Margins and Associated Fractures:

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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

Fractures caused by igneous activity creates permeability, allowing water to circulate deep beneath the surface thus becoming heated in the process. http://www.indiana.edu/~sierra/papers/2007/burnham.html

Hydrothermal circulation often occurs at the lithologic boundaries of igneous intrusions and along the fractures they induce in the country rock.

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
Blue Mountain Geothermal Area	Northwest Basin and Range Geothermal Region	Extensional Tectonics	Triassic	Metasedimentary	49.5 MW 49,500 kW 49,500,000 W 49,500,000,000 mW 0.0495 GW 4.95e-5 TW	470.15 K 197 °C 386.6 °F 846.27 °R
Chena Geothermal Area	Alaska Geothermal Region	Non-Tectonic	90 Ma	Granitic Pluton	0.4 MW 400 kW 400,000 W 400,000,000 mW 4.0e-4 GW 4.0e-7 TW	371.15 K 98 °C 208.4 °F 668.07 °R
Kilauea East Rift Geothermal Area	Hawaii Geothermal Region	Hot Spot	Quaternary	Tholeiitic Basalt	47 MW 47,000 kW 47,000,000 W 47,000,000,000 mW 0.047 GW 4.7e-5 TW	575.15 K 302 °C 575.6 °F 1,035.27 °R
Waunita Hot Springs Geothermal Area	Rio Grande Rift