Fault Intersection

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Fault Intersection

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Fault Intersection:
Fault intersections are junctions between normal faults and either transversely oriented strike-slip or oblique-slip faults. Subsurface fluid flow in these areas is enhanced by multiple minor faults that connect the major intersecting structures, forming highly fractured zones or dilational quadrants with increased permeability.
Other definitions:Wikipedia Reegle


There are numerous configurations fault intersections can make, this figure illustrates a simplified fault intersection with an initial fault that get crossed by a later fault at a 90 degree angle. http://homepage.ufp.pt/biblioteca/WebBasPrinTectonics/BasPrincTectonics/Page5.htm

Faulds uses these terms (fault intersection and a subset classification - displacement transfer zone) as structural controls found in the Basin and Range province of the US.

Fault intersections between normal faults and transversely oriented strike-slip or oblique-slip faults account for 22% of the Basin & Range structures known to host geothermal systems as of 2011. Multiple minor faults in these areas create connections between major structures, allowing fluids to flow through highly fractured dilational quadrants.[1]

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" button.

CSV
Geothermal
Resource
Area
Geothermal
Region
Tectonic
Setting
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Bac-Man Laguna Geothermal Area Philippine Island Arc Subduction Zone Volcanic 150 MW150,000 kW
150,000,000 W
150,000,000,000 mW
0.15 GW
1.5e-4 TW
543.15 K270 °C
518 °F
977.67 °R
Blue Mountain Geothermal Area Northwest Basin and Range Geothermal Region Extensional Tectonics 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
Bouillante Geothermal Area Lesser Antilles Volcanic Arc Subduction Zone Chlorite 15 MW15,000 kW
15,000,000 W
15,000,000,000 mW
0.015 GW
1.5e-5 TW
528.15 K255 °C
491 °F
950.67 °R
Chena Geothermal Area Alaska Geothermal Region Non-Tectonic 90 Ma Granitic Pluton 0.4 MW400 kW
400,000 W
400,000,000 mW
4.0e-4 GW
4.0e-7 TW
371.15 K98 °C
208.4 °F
668.07 °R
Germencik Geothermal Area Aegean-West Anatolian Extensional Region Extensional Tectonics 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 Extensional Tectonics
Strike-Slip
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
Kagoshima Geothermal Area Ryuku Arc Subduction Zone Neogene to recent Volcanic Rocks, Andesite 0.1 MW100 kW
100,000 W
100,000,000 mW
1.0e-4 GW
1.0e-7 TW
512.15 K239 °C
462.2 °F
921.87 °R
Kawerau Geothermal Area Taupo Volcanic Zone Extensional Tectonics
Subduction Zone
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 Extensional Tectonics 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
Lahendong Geothermal Area Minahasa Volcanic Zone Subduction Zone Miocene Andesite 80 MW80,000 kW
80,000,000 W
80,000,000,000 mW
0.08 GW
8.0e-5 TW
578.15 K305 °C
581 °F
1,040.67 °R
Lightning Dock Geothermal Area Southern Basin and Range Geothermal Region Extensional Tectonics 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
Mokai Geothermal Area Taupo Volcanic Zone Extensional Tectonics
Subduction Zone
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
Mutnovskaya Geothermal Area Kuril-Kamchatka Arc Subduction Zone Oligocene 62 MW62,000 kW
62,000,000 W
62,000,000,000 mW
0.062 GW
6.2e-5 TW
507.15 K234 °C
453.2 °F
912.87 °R
North Brawley Geothermal Area Gulf of California Rift Zone Strike-Slip Arkosic and quartz dominated sandstones 50 MW50,000 kW
50,000,000 W
50,000,000,000 mW
0.05 GW
5.0e-5 TW
539.15 K266 °C
510.8 °F
970.47 °R
Ohaaki Geothermal Area Taupo Volcanic Zone Extensional Tectonics
Subduction Zone
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 Extensional Tectonics 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
Rotokawa Geothermal Area Taupo Volcanic Zone Extensional Tectonics
Subduction Zone
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
Steamboat Springs Geothermal Area Walker-Lane Transition Zone Extensional Tectonics 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
Sumatra-Sibayak Geothermal Area Sunda Volcanic Arc - Great Sumatra Fault Zone Subduction Zone Tertiary Sandstone; Limestone 12 MW12,000 kW
12,000,000 W
12,000,000,000 mW
0.012 GW
1.2e-5 TW
543.15 K270 °C
518 °F
977.67 °R
Svartsengi Geothermal Area Mid Atlantic Ridge Rift Zone 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
Tuzla Geothermal Area Aegean-West Anatolian Extensional Region Extensional Tectonics 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 Rift Zone
Extensional Tectonics
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 Rift Zone
Extensional Tectonics
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”
Wairakei-Poihipi Geothermal Area Taupo Volcanic Zone Extensional Tectonics
Subduction Zone
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
Yangbajain Geothermal Area Himalayan Mountain Range 24 MW24,000 kW
24,000,000 W
24,000,000,000 mW
0.024 GW
2.4e-5 TW
478.15 K205 °C
401 °F
860.67 °R

References

  1. James E. Faulds,Nicholas H. Hinz,Mark F. Coolbaugh,Patricia H. Cashman,Christopher Kratt,Gregory Dering,Joel Edwards,Brett Mayhew,Holly McLachlan. 2011. Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA. In: Transactions. GRC Anual Meeting; 2011/10/23; San Diego, CA. Davis, CA: Geothermal Resources Council; p. 777–783