Extensional Tectonics

From Open Energy Information

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Extensional Tectonics:
A tectonic process associated with the stretching and thinning of the crust or lithosphere
Other definitions:Wikipedia Reegle


Tectonic Settings

List of tectonic settings known to host modern geothermal systems:
Crustal extension results in horst and graben topography (reference: geologycafe.com)

Crustal extension (or lithospheric extension) results in a thinning of the crust, bringing the Earth’s surface closer to the hot mantle which increases heat flow. This high heat flow often results in moderate temperature (190-230°C) geothermal resources. Extensional zones are exemplified by horst and graben structures such as those found in the Basin & Range province of the US.


Examples

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

CSV
Geothermal
Resource
Area
Geothermal
Region
Control
Structure
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Amedee Geothermal AreaWalker-Lane Transition ZoneDisplacement Transfer ZoneMesozoicgranite; granodiorite
Aurora Geothermal AreaWalker-Lane Transition Zone Geothermal Region132 MW
132,000 kW
132,000,000 W
132,000,000,000 mW
0.132 GW
1.32e-4 TW
Beowawe Hot Springs Geothermal AreaCentral Nevada Seismic Zone Geothermal RegionPull-Apart in Strike-Slip Fault ZoneOrdovicianshale; quartzite17 MW
17,000 kW
17,000,000 W
17,000,000,000 mW
0.017 GW
1.7e-5 TW
483.15 K
210 °C
410 °F
869.67 °R
Blue Mountain Geothermal AreaNorthwest Basin and Range Geothermal RegionFault Intersection
Intrusion Margins and Associated Fractures
TriassicMetasedimentary49.5 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
Brady Hot Springs Geothermal AreaNorthwest Basin and Range Geothermal RegionAccommodation ZoneMesozoicmetamorphic rocks26.1 MW
26,100 kW
26,100,000 W
26,100,000,000 mW
0.0261 GW
2.61e-5 TW
455.15 K
182 °C
359.6 °F
819.27 °R
Coso Geothermal AreaWalker-Lane Transition ZonePull-Apart in Strike-Slip Fault ZoneMesozoicgranitic300 MW
300,000 kW
300,000,000 W
300,000,000,000 mW
0.3 GW
3.0e-4 TW
571.15 K
298 °C
568.4 °F
1,028.07 °R
Desert Peak Geothermal AreaNorthwest Basin and Range Geothermal RegionStepover or Relay Ramp in Normal Fault ZonesMesozoicgreenstone23 MW
23,000 kW
23,000,000 W
23,000,000,000 mW
0.023 GW
2.3e-5 TW
481.15 K
208 °C
406.4 °F
866.07 °R
Dixie Valley Geothermal AreaCentral Nevada Seismic Zone Geothermal RegionMajor Normal Fault
Stepover or Relay Ramp in Normal Fault Zones
JurassicBasalt62 MW
62,000 kW
62,000,000 W
62,000,000,000 mW
0.062 GW
6.2e-5 TW
504.15 K
231 °C
447.8 °F
907.47 °R
Fenton Hill HDR Geothermal AreaRio Grande RiftLithologically ControlledPrecambrianCrystalline 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
Germencik Geothermal AreaAegean-West Anatolian Extensional RegionFault IntersectionMarble73.4 MW
73,400 kW
73,400,000 W
73,400,000,000 mW
0.0734 GW
7.34e-5 TW
491.15 K
218 °C
424.4 °F
884.07 °R
Gumuskoy Geothermal AreaAegean-West Anatolian Extensional RegionFault IntersectionPaleozicMarble13.2 MW
13,200 kW
13,200,000 W
13,200,000,000 mW
0.0132 GW
1.32e-5 TW
413.15 K
140 °C
284 °F
743.67 °R
Humboldt House Geothermal AreaNorthwest Basin and Range Geothermal RegionFault Controlled0.3 MW
300 kW
300,000 W
300,000,000 mW
3.0e-4 GW
3.0e-7 TW
466.15 K
193 °C
379.4 °F
839.07 °R
Kawerau Geothermal AreaTaupo Volcanic ZoneFault IntersectionQuaternaryVolcaniclastic; Sandstone; Mudstone115 MW
115,000 kW
115,000,000 W
115,000,000,000 mW
0.115 GW
1.15e-4 TW
543.15 K
270 °C
518 °F
977.67 °R
Kizildere Geothermal AreaAegean-West Anatolian Extensional RegionFault IntersectionMioceneLimestone102 MW
102,000 kW
102,000,000 W
102,000,000,000 mW
0.102 GW
1.02e-4 TW
459.15 K
186 °C
366.8 °F
826.47 °R
Langjiu Geothermal AreaTibet Geothermal RegionFault Controlled1 MW
1,000 kW
1,000,000 W
1,000,000,000 mW
0.001 GW
1.0e-6 TW
377.15 K
104 °C
219.2 °F
678.87 °R
Lightning Dock Geothermal AreaSouthern Basin and Range Geothermal RegionFault IntersectionPaleozoic carbonate rocks and late Tertiary volcanic rocks4.4 MW
4,400 kW
4,400,000 W
4,400,000,000 mW
0.0044 GW
4.4e-6 TW
443.15 K
170 °C
338 °F
797.67 °R
Long Valley Caldera Geothermal AreaWalker-Lane Transition ZoneDisplacement Transfer ZoneQuaternaryBishop Tuff, Metamorphic Basement38 MW
38,000 kW
38,000,000 W
38,000,000,000 mW
0.038 GW
3.8e-5 TW
513.15 K
240 °C
464 °F
923.67 °R
Mokai Geothermal AreaTaupo Volcanic ZoneFault IntersectionQuaternaryVolcaniclastic112 MW
112,000 kW
112,000,000 W
112,000,000,000 mW
0.112 GW
1.12e-4 TW
568.15 K
295 °C
563 °F
1,022.67 °R
Nagqu Geothermal AreaTibet geothermal region5.8 MW
5,800 kW
5,800,000 W
5,800,000,000 mW
0.0058 GW
5.8e-6 TW
388.15 K
115 °C
239 °F
698.67 °R
Neal Hot Springs Geothermal AreaSnake River PlainPull-Apart in Strike-Slip Fault ZoneMioceneBasalt33 MW
33,000 kW
33,000,000 W
33,000,000,000 mW
0.033 GW
3.3e-5 TW
429.15 K
156 °C
312.8 °F
772.47 °R
Ohaaki Geothermal AreaTaupo Volcanic ZoneFault IntersectionQuaternaryVolcaniclastic122 MW
122,000 kW
122,000,000 W
122,000,000,000 mW
0.122 GW
1.22e-4 TW
538.15 K
265 °C
509 °F
968.67 °R
Raft River Geothermal AreaNorthern Basin and Range Geothermal RegionFault Intersection1- Archean; 2-Proterozoic1- quartz monzonite; 2-schist; quartzite13 MW
13,000 kW
13,000,000 W
13,000,000,000 mW
0.013 GW
1.3e-5 TW
468.15 K
195 °C
383 °F
842.67 °R
Romania Geothermal AreaEurope0.5 MW
500 kW
500,000 W
500,000,000 mW
5.0e-4 GW
5.0e-7 TW
358.15 K
85 °C
185 °F
644.67 °R
Roosevelt Hot Springs Geothermal AreaNorthern Basin and Range Geothermal Region1- Tertiary; 2- Precambrian1- granite; 2- metamorphic34 MW
34,000 kW
34,000,000 W
34,000,000,000 mW
0.034 GW
3.4e-5 TW
533.15 K
260 °C
500 °F
959.67 °R
Rotokawa Geothermal AreaTaupo Volcanic ZoneFault IntersectionQuaternaryVolcaniclastic167 MW
167,000 kW
167,000,000 W
167,000,000,000 mW
0.167 GW
1.67e-4 TW
573.15 K
300 °C
572 °F
1,031.67 °R
Rye Patch Geothermal AreaNorthwest Basin and Range Geothermal Region12.5 MW
12,500 kW
12,500,000 W
12,500,000,000 mW
0.0125 GW
1.25e-5 TW
486.15 K
213 °C
415.4 °F
875.07 °R
Salavatli Geothermal AreaAegean-West Anatolian Extensional RegionMajor Normal Fault58 MW
58,000 kW
58,000,000 W
58,000,000,000 mW
0.058 GW
5.8e-5 TW
444.15 K
171 °C
339.8 °F
799.47 °R
Salt Wells Geothermal AreaNorthwest Basin and Range Geothermal Region23.6 MW
23,600 kW
23,600,000 W
23,600,000,000 mW
0.0236 GW
2.36e-5 TW
466.15 K
193 °C
379.4 °F
839.07 °R
San Emidio Desert Geothermal AreaNorthwest Basin and Range Geothermal Region14.22 MW
14,220 kW
14,220,000 W
14,220,000,000 mW
0.0142 GW
1.422e-5 TW
426.15 K
153 °C
307.4 °F
767.07 °R
Soda Lake Geothermal AreaNorthwest Basin and Range Geothermal RegionMiocenepumice tuff26.1 MW
26,100 kW
26,100,000 W
26,100,000,000 mW
0.0261 GW
2.61e-5 TW
452.15 K
179 °C
354.2 °F
813.87 °R
Steamboat Springs Geothermal AreaWalker-Lane Transition ZoneFault Intersection1- Cretaceous; 2- Pliocene-Pleistocene1- granodiorite; 2- basaltic andesite147 MW
147,000 kW
147,000,000 W
147,000,000,000 mW
0.147 GW
1.47e-4 TW
483.15 K
210 °C
410 °F
869.67 °R
Stillwater Geothermal AreaNorthwest Basin and Range Geothermal RegionAccommodation ZoneQuaternarysandstone47.2 MW
47,200 kW
47,200,000 W
47,200,000,000 mW
0.0472 GW
4.72e-5 TW
447.15 K
174 °C
345.2 °F
804.87 °R
Takigami Geothermal AreaRyuku ArcFault ControlledTertiaryAndesite28 MW
28,000 kW
28,000,000 W
28,000,000,000 mW
0.028 GW
2.8e-5 TW
478.15 K
205 °C
401 °F
860.67 °R
Tuzla Geothermal AreaAegean-West Anatolian Extensional RegionFault Intersection8 MW
8,000 kW
8,000,000 W
8,000,000,000 mW
0.008 GW
8.0e-6 TW
405.15 K
132 °C
269.6 °F
729.27 °R
Valles Caldera - Redondo Geothermal AreaRio Grande RiftCaldera Rim Margins
Fault Intersection
Stratigraphic Boundaries
Mississippian-Pennsylvanian; Pleistocene, 1.6 to 1.25 MaLimestone-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 AreaRio Grande RiftCaldera Rim Margins
Fault Intersection
Stratigraphic Boundaries
Precambrian; Mississippian-Pennsylvanian; Pleistocene, 1.6 to 1.25 Ma; Pliocene; MioceneCrystalline 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”
Wabuska Hot Springs Geothermal AreaWalker-Lane Transition Zone Geothermal RegionQuaternarygravels; sands2.4 MW
2,400 kW
2,400,000 W
2,400,000,000 mW
0.0024 GW
2.4e-6 TW
403.15 K
130 °C
266 °F
725.67 °R
Wairakei-Poihipi Geothermal AreaTaupo Volcanic ZoneFault IntersectionQuaternaryVolcaniclastic352 MW
352,000 kW
352,000,000 W
352,000,000,000 mW
0.352 GW
3.52e-4 TW
483.15 K
210 °C
410 °F
869.67 °R
Wendel Geothermal AreaWalker-Lane Transition Zone Geothermal RegionDisplacement Transfer ZoneMesozoicGranite, Granodiorite3.8 MW
3,800 kW
3,800,000 W
3,800,000,000 mW
0.0038 GW
3.8e-6 TW
413.15 K
140 °C
284 °F
743.67 °R
Wild Rose Geothermal AreaWalker-Lane Transition Zone Geothermal RegionFault Controlled16 MW
16,000 kW
16,000,000 W
16,000,000,000 mW
0.016 GW
1.6e-5 TW
412.15 K
139 °C
282.2 °F
741.87 °R