Extensional Tectonics

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Extensional Tectonics

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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" button.

CSV
Geothermal
Resource
Area
Geothermal
Region
Control
Structure
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Amedee Geothermal Area Walker-Lane Transition Zone Displacement Transfer Zone Mesozoic granite; granodiorite
Aurora Geothermal Area Walker-Lane Transition Zone Geothermal Region 132 MW132,000 kW
132,000,000 W
132,000,000,000 mW
0.132 GW
1.32e-4 TW
Beowawe Hot Springs Geothermal Area Central Nevada Seismic Zone Geothermal Region Pull-Apart in Strike-Slip Fault Zone Ordovician shale; quartzite 17 MW17,000 kW
17,000,000 W
17,000,000,000 mW
0.017 GW
1.7e-5 TW
483.15 K210 °C
410 °F
869.67 °R
Blue Mountain Geothermal Area Northwest Basin and Range Geothermal Region Intrusion Margins and Associated Fractures
Fault Intersection
Triassic Metasedimentary 49.5 MW49,500 kW
49,500,000 W
49,500,000,000 mW
0.0495 GW
4.95e-5 TW
470.15 K197 °C
386.6 °F
846.27 °R
Brady Hot Springs Geothermal Area Northwest Basin and Range Geothermal Region Accommodation Zone Mesozoic metamorphic rocks 26.1 MW26,100 kW
26,100,000 W
26,100,000,000 mW
0.0261 GW
2.61e-5 TW
455.15 K182 °C
359.6 °F
819.27 °R
Coso Geothermal Area Walker-Lane Transition Zone Pull-Apart in Strike-Slip Fault Zone Mesozoic granitic 300 MW300,000 kW
300,000,000 W
300,000,000,000 mW
0.3 GW
3.0e-4 TW
571.15 K298 °C
568.4 °F
1,028.07 °R
Desert Peak Geothermal Area Northwest Basin and Range Geothermal Region Stepover or Relay Ramp in Normal Fault Zones Mesozoic greenstone 23 MW23,000 kW
23,000,000 W
23,000,000,000 mW
0.023 GW
2.3e-5 TW
481.15 K208 °C
406.4 °F
866.07 °R
Dixie Valley Geothermal Area Central Nevada Seismic Zone Geothermal Region Stepover or Relay Ramp in Normal Fault Zones
Major Normal Fault
Jurassic Basalt 62 MW62,000 kW
62,000,000 W
62,000,000,000 mW
0.062 GW
6.2e-5 TW
504.15 K231 °C
447.8 °F
907.47 °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
Germencik Geothermal Area Aegean-West Anatolian Extensional Region Fault Intersection Marble 73.4 MW73,400 kW
73,400,000 W
73,400,000,000 mW
0.0734 GW
7.34e-5 TW
491.15 K218 °C
424.4 °F
884.07 °R
Gumuskoy Geothermal Area Aegean-West Anatolian Extensional Region Fault Intersection Paleozic Marble 13.2 MW13,200 kW
13,200,000 W
13,200,000,000 mW
0.0132 GW
1.32e-5 TW
413.15 K140 °C
284 °F
743.67 °R
Humboldt House Geothermal Area Northwest Basin and Range Geothermal Region Fault Controlled 0.3 MW300 kW
300,000 W
300,000,000 mW
3.0e-4 GW
3.0e-7 TW
466.15 K193 °C
379.4 °F
839.07 °R
Kawerau Geothermal Area Taupo Volcanic Zone Fault Intersection Quaternary Volcaniclastic; Sandstone; Mudstone 115 MW115,000 kW
115,000,000 W
115,000,000,000 mW
0.115 GW
1.15e-4 TW
543.15 K270 °C
518 °F
977.67 °R
Kizildere Geothermal Area Aegean-West Anatolian Extensional Region Fault Intersection Miocene Limestone 102 MW102,000 kW
102,000,000 W
102,000,000,000 mW
0.102 GW
1.02e-4 TW
459.15 K186 °C
366.8 °F
826.47 °R
Langjiu Geothermal Area Tibet Geothermal Region Fault Controlled 1 MW1,000 kW
1,000,000 W
1,000,000,000 mW
1.0e-3 GW
1.0e-6 TW
377.15 K104 °C
219.2 °F
678.87 °R
Lightning Dock Geothermal Area Southern Basin and Range Geothermal Region Fault Intersection Paleozoic carbonate rocks and late Tertiary volcanic rocks 4.4 MW4,400 kW
4,400,000 W
4,400,000,000 mW
0.0044 GW
4.4e-6 TW
443.15 K170 °C
338 °F
797.67 °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
Mokai Geothermal Area Taupo Volcanic Zone Fault Intersection Quaternary Volcaniclastic 112 MW112,000 kW
112,000,000 W
112,000,000,000 mW
0.112 GW
1.12e-4 TW
568.15 K295 °C
563 °F
1,022.67 °R
Nagqu Geothermal Area Tibet geothermal region 5.8 MW5,800 kW
5,800,000 W
5,800,000,000 mW
0.0058 GW
5.8e-6 TW
388.15 K115 °C
239 °F
698.67 °R
Neal Hot Springs Geothermal Area Snake River Plain Pull-Apart in Strike-Slip Fault Zone Miocene Basalt 33 MW33,000 kW
33,000,000 W
33,000,000,000 mW
0.033 GW
3.3e-5 TW
429.15 K156 °C
312.8 °F
772.47 °R
Ohaaki Geothermal Area Taupo Volcanic Zone Fault Intersection Quaternary Volcaniclastic 122 MW122,000 kW
122,000,000 W
122,000,000,000 mW
0.122 GW
1.22e-4 TW
538.15 K265 °C
509 °F
968.67 °R
Raft River Geothermal Area Northern Basin and Range Geothermal Region Fault Intersection 1- Archean; 2-Proterozoic 1- quartz monzonite; 2-schist; quartzite 13 MW13,000 kW
13,000,000 W
13,000,000,000 mW
0.013 GW
1.3e-5 TW
468.15 K195 °C
383 °F
842.67 °R
Romania Geothermal Area Europe 0.5 MW500 kW
500,000 W
500,000,000 mW
5.0e-4 GW
5.0e-7 TW
358.15 K85 °C
185 °F
644.67 °R
Roosevelt Hot Springs Geothermal Area Northern Basin and Range Geothermal Region 1- Tertiary; 2- Precambrian 1- granite; 2- metamorphic 34 MW34,000 kW
34,000,000 W
34,000,000,000 mW
0.034 GW
3.4e-5 TW
533.15 K260 °C
500 °F
959.67 °R
Rotokawa Geothermal Area Taupo Volcanic Zone Fault Intersection Quaternary Volcaniclastic 167 MW167,000 kW
167,000,000 W
167,000,000,000 mW
0.167 GW
1.67e-4 TW
573.15 K300 °C
572 °F
1,031.67 °R
Rye Patch Geothermal Area Northwest Basin and Range Geothermal Region 12.5 MW12,500 kW
12,500,000 W
12,500,000,000 mW
0.0125 GW
1.25e-5 TW
486.15 K213 °C
415.4 °F
875.07 °R
Salavatli Geothermal Area Aegean-West Anatolian Extensional Region Major Normal Fault 58 MW58,000 kW
58,000,000 W
58,000,000,000 mW
0.058 GW
5.8e-5 TW
444.15 K171 °C
339.8 °F
799.47 °R
Salt Wells Geothermal Area Northwest Basin and Range Geothermal Region 23.6 MW23,600 kW
23,600,000 W
23,600,000,000 mW
0.0236 GW
2.36e-5 TW
466.15 K193 °C
379.4 °F
839.07 °R
San Emidio Desert Geothermal Area Northwest Basin and Range Geothermal Region 14.22 MW14,220 kW
14,220,000 W
14,220,000,000 mW
0.0142 GW
1.422e-5 TW
426.15 K153 °C
307.4 °F
767.07 °R
Soda Lake Geothermal Area Northwest Basin and Range Geothermal Region Miocene pumice tuff 26.1 MW26,100 kW
26,100,000 W
26,100,000,000 mW
0.0261 GW
2.61e-5 TW
452.15 K179 °C
354.2 °F
813.87 °R
Steamboat Springs Geothermal Area Walker-Lane Transition Zone Fault Intersection 1- Cretaceous; 2- Pliocene-Pleistocene 1- granodiorite; 2- basaltic andesite 147 MW147,000 kW
147,000,000 W
147,000,000,000 mW
0.147 GW
1.47e-4 TW
483.15 K210 °C
410 °F
869.67 °R
Stillwater Geothermal Area Northwest Basin and Range Geothermal Region Accommodation Zone Quaternary sandstone 47.2 MW47,200 kW
47,200,000 W
47,200,000,000 mW
0.0472 GW
4.72e-5 TW
447.15 K174 °C
345.2 °F
804.87 °R
Takigami Geothermal Area Ryuku Arc Fault Controlled Tertiary Andesite 28 MW28,000 kW
28,000,000 W
28,000,000,000 mW
0.028 GW
2.8e-5 TW
478.15 K205 °C
401 °F
860.67 °R
Tuzla Geothermal Area Aegean-West Anatolian Extensional Region Fault Intersection 8 MW8,000 kW
8,000,000 W
8,000,000,000 mW
0.008 GW
8.0e-6 TW
405.15 K132 °C
269.6 °F
729.27 °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”
Wabuska Hot Springs Geothermal Area Walker-Lane Transition Zone Geothermal Region Quaternary gravels; sands 2.4 MW2,400 kW
2,400,000 W
2,400,000,000 mW
0.0024 GW
2.4e-6 TW
403.15 K130 °C
266 °F
725.67 °R
Wairakei-Poihipi Geothermal Area Taupo Volcanic Zone Fault Intersection Quaternary Volcaniclastic 352 MW352,000 kW
352,000,000 W
352,000,000,000 mW
0.352 GW
3.52e-4 TW
483.15 K210 °C
410 °F
869.67 °R
Wendel Geothermal Area Walker-Lane Transition Zone Geothermal Region Displacement Transfer Zone Mesozoic Granite, Granodiorite 3.8 MW3,800 kW
3,800,000 W
3,800,000,000 mW
0.0038 GW
3.8e-6 TW
413.15 K140 °C
284 °F
743.67 °R
Wild Rose Geothermal Area Walker-Lane Transition Zone Geothermal Region Fault Controlled 16 MW16,000 kW
16,000,000 W
16,000,000,000 mW
0.016 GW
1.6e-5 TW
412.15 K139 °C
282.2 °F
741.87 °R