Pull-Apart in Strike-Slip Fault Zone

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Pull-Apart in Strike-Slip Fault Zone

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Pull-Apart in Strike-Slip Fault Zone:
Pull-aparts are dilatational features that form along offset fault segments in strike-slip fault zones. Pull-aparts form at right-stepping offsets of dextral fault systems or at left-stepping offsets of sinistral fault systems, resulting in localized crustal extension and enhanced permeability.
Other definitions:Wikipedia Reegle


Pull-aparts form in strike-slip fault zones. Arrows indicate direction of slip. (reference: http://myweb.cwpost.liu.edu/vdivener/notes/cont_transform.htm)

Faulds uses this term as a structural control found in the Basin and Range province of the US.

Pull-aparts are dilatational features that form along accommodation bends in strike-slip fault zones. 4% of all known Great Basin geothermal systems are located in pull-aparts, but are more abundant within or along the margins of the Walker Lane.[1]

Examples

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CSV
Geothermal
Resource
Area
Geothermal
Region
Tectonic
Setting
Host
Rock
Age
Host
Rock
Lithology
Mean
Capacity
Mean
Reservoir
Temp
Beowawe Hot Springs Geothermal Area Central Nevada Seismic Zone Geothermal Region Extensional Tectonics 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
Coso Geothermal Area Walker-Lane Transition Zone Extensional Tectonics 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
Geysers Geothermal Area Holocene Magmatic Mesozoic metamorphosed sandstone 1,585 MW1,585,000 kW
1,585,000,000 W
1,585,000,000,000 mW
1.585 GW
0.00159 TW
551.15 K278 °C
532.4 °F
992.07 °R
Heber Geothermal Area Gulf of California Rift Zone Rift 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
Neal Hot Springs Geothermal Area Snake River Plain Extensional Tectonics 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
Salton Sea Geothermal Area Gulf of California Rift Zone Rift 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

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