Rift Zone

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Rift Zone

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Rift Zone:
A divergent plate boundary within a continent
Other definitions:Wikipedia Reegle


Tectonic Settings

List of tectonic settings known to host modern geothermal systems:
The Rio Grande Rift exemplifies rift zone tectonics - increased volcanic activity and the formation of graben structures (reference: science-art.com)

Rift valleys occur at divergent plate boundaries, resulting in large graben structures and increased volcanism. The East African Rift is an example of a continental rift zone with increased volcanism, while the Atlantic’s spreading Mid-Ocean Ridge is host to an enormous amount of geothermal activity in Iceland.

Some rift zones, like that of the Gulf of California, exhibit transtensional strains exemplified by strike-slip regions like that of the San Andreas fault. Rift zones may also give way to leaky transform faults that may contribute to increased volcanism as is thought to be the case with Las Tres Virgenes in Baja California, Mexico and the Azores Islands which are located on a triple junction.

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
Aluto-Langano Geothermal Area East African Rift System - Ethiopian Rift Valley Major Normal Fault Basalt 7.5 MW7,500 kW
7,500,000 W
7,500,000,000 mW
0.0075 GW
7.5e-6 TW
561.15 K288 °C
550.4 °F
1,010.07 °R
Bjarnaflag Geothermal Area Mid Atlantic Ridge Basalt 3 MW3,000 kW
3,000,000 W
3,000,000,000 mW
0.003 GW
3.0e-6 TW
573.15 K300 °C
572 °F
1,031.67 °R
Bruchsal Geothermal Area Upper Rhine Valley Major Normal Fault Triassic Sandstone 0.6 MW600 kW
600,000 W
600,000,000 mW
6.0e-4 GW
6.0e-7 TW
413.15 K140 °C
284 °F
743.67 °R
Cerro Prieto Geothermal Area Gulf of California Rift Zone Geothermal Region Sandstone 720 MW720,000 kW
720,000,000 W
720,000,000,000 mW
0.72 GW
7.2e-4 TW
588.15 K315 °C
599 °F
1,058.67 °R
East Mesa Geothermal Area Gulf of California Rift Zone sandstone 115 MW115,000 kW
115,000,000 W
115,000,000,000 mW
0.115 GW
1.15e-4 TW
443.15 K170 °C
338 °F
797.67 °R
Eburru Geothermal Area East African Rift System - Kenya Rift Basalt 2.5 MW2,500 kW
2,500,000 W
2,500,000,000 mW
0.0025 GW
2.5e-6 TW
578.15 K305 °C
581 °F
1,040.67 °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
Heber Geothermal Area Gulf of California Rift Zone Pull-Apart in Strike-Slip Fault Zone sandstone 180 MW180,000 kW
180,000,000 W
180,000,000,000 mW
0.18 GW
1.8e-4 TW
447.15 K174 °C
345.2 °F
804.87 °R
Hellisheidi Geothermal Area South Iceland Seismic Zone - Mid Atlantic Ridge Basalt 303 MW303,000 kW
303,000,000 W
303,000,000,000 mW
0.303 GW
3.03e-4 TW
533.15 K260 °C
500 °F
959.67 °R
Husavik (Hveravellir) Geothermal Area Mid Atlantic Ridge Basalt 2 MW2,000 kW
2,000,000 W
2,000,000,000 mW
0.002 GW
2.0e-6 TW
395.15 K122 °C
251.6 °F
711.27 °R
Krafla Geothermal Area Mid Atlantic Ridge Basalt 60 MW60,000 kW
60,000,000 W
60,000,000,000 mW
0.06 GW
6.0e-5 TW
538.15 K265 °C
509 °F
968.67 °R
Landau Geothermal Area Upper Rhine Valley Major Normal Fault 3.6 MW3,600 kW
3,600,000 W
3,600,000,000 mW
0.0036 GW
3.6e-6 TW
413.15 K140 °C
284 °F
743.67 °R
Las Tres Virgenes Geothermal Area Baja Peninsula Geothermal Region Granodiorite 10 MW10,000 kW
10,000,000 W
10,000,000,000 mW
0.01 GW
1.0e-5 TW
553.15 K280 °C
536 °F
995.67 °R
Nesjavellir Geothermal Area South Iceland Seismic Zone - Mid Atlantic Ridge Basalt 120 MW120,000 kW
120,000,000 W
120,000,000,000 mW
0.12 GW
1.2e-4 TW
568.15 K295 °C
563 °F
1,022.67 °R
Olkaria Geothermal Area East African Rift System - Kenya Rift 602 MW602,000 kW
602,000,000 W
602,000,000,000 mW
0.602 GW
6.02e-4 TW
548.15 K275 °C
527 °F
986.67 °R
Pico Vermelho-Ribeira Grande Geothermal Area Mid Atlantic Ridge Basalt 28.5 MW28,500 kW
28,500,000 W
28,500,000,000 mW
0.0285 GW
2.85e-5 TW
511.15 K238 °C
460.4 °F
920.07 °R
Reykjanes Geothermal Area Mid Atlantic Ridge Basalt 100 MW100,000 kW
100,000,000 W
100,000,000,000 mW
0.1 GW
1.0e-4 TW
583.15 K310 °C
590 °F
1,049.67 °R
Salton Sea Geothermal Area Gulf of California Rift Zone Pull-Apart in Strike-Slip Fault Zone Pleistocene sandstone 437 MW437,000 kW
437,000,000 W
437,000,000,000 mW
0.437 GW
4.37e-4 TW
575.15 K302 °C
575.6 °F
1,035.27 °R
Svartsengi Geothermal Area Mid Atlantic Ridge Fault Intersection Basalt 76 MW76,000 kW
76,000,000 W
76,000,000,000 mW
0.076 GW
7.6e-5 TW
513.15 K240 °C
464 °F
923.67 °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”