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Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA
Abstract We have undertaken a thorough inventory of
We have undertaken a thorough inventory of the structural settings of known geothermal systems (>400 total) in the extensional to transtensional terrane of the Great Basin in the western USA. Of the more than 200 geothermal fields catalogued to date, we found that step-overs or relay ramps in normal fault zones served as the most favorable structural setting, hosting ~32% of the systems. Such areas are characterized by multiple, commonly overlapping fault strands, increased fracture density, and thus enhanced permeability. Other common settings include a) intersections between normal faults and either transversely oriented strike-slip or oblique-slip faults (22%), where multiple minor faults typically connect major structures and fluids can flow readily through highly fractured, dilational quadrants, and b) normal fault terminations or tip-lines (22%), where horse-tailing generates a myriad of closely-spaced faults and thus increased permeability. A major subset of fault intersections includes displacement transfer zones (5%) between strike-slip faults in the Walker Lane and N- to NNE-striking normal faults, with geothermal systems commonly focused along the normal faults proximal to their dilational intersections with nearby dextral faults. Other notable structural settings for geothermal systems in the Great Basin include accommodation zones (i.e., belts of intermeshing, oppositely dipping normal faults; 8%), major range-front faults (3%), salients or apices of major normal faults (3%), and pull-aparts in strike-slip fault systems (4%). Pull aparts and displacement transfer zones are more abundant within or along the margins of the Walker Lane, whereas step-overs and accommodation zones in normal fault systems are more prevalent within the extensional terrane that characterizes much of the Great Basin northeast of the Walker Lane. In addition, Quaternary faults typically lie within or near most of the geothermal systems. However, geothermal systems appear to be rare along the displacement-maxima zones or mid-segments of major normal faults (i.e., major range-front faults), possibly due to both reduced permeability in thick zones of clay gouge and periodic release of stress in major earthquakes. Step-overs, terminations, intersections, and accommodation zones in normal fault systems would tend to correspond to long-term, critically stressed areas, where fluid pathways would more likely remain open in networks of closely-spaced, breccia-dominated fractures. It is also important to note that many of the higher enthalpy systems are characterized by more than one type of favorable setting at a single locality (e.g., Steamboat, Brady’s, and Salt Wells).
e.g., Steamboat, Brady’s, and Salt Wells).  +
Author James E. Faulds  + , Nicholas H. Hinz  + , Mark F. Coolbaugh  + , Patricia H. Cashman  + , Christopher Kratt  + , Gregory Dering  + , Joel Edwards  + , Brett Mayhew  + , Holly McLachlan  +
Citation James E. Faulds,Nicholas H. Hinz,Mark F. C
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
Geothermal Resources Council; p. 777–783  +
Conference GRC Anual Meeting  +
Document type Conference Paper  +
Foaf/Page https://www.geothermal-library.org/index.php?mode=pubs&action=view&record=1029329  +
Link https://www.geothermal-library.org/index.php?mode=pubs&action=view&record=1029329  +
Name Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA  +
Place San Diego, CA +
PublicationDate 2011  +
Publisher Geothermal Resources Council  +
ReferenceGenre Geothermal  +
Has query
"Has query" is a predefined property that represents meta information (in form of a subobject) about individual queries and is provided by Semantic MediaWiki.
Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA + , Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA + , Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA + , Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA + , Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA +
Categories References , Reference Materials , Geothermal References
Modification date
"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
17:01:43, 16 September 2013  +
hide properties that link here 
Amedee Geothermal Area + , Blue Mountain Geothermal Area + , Coso Geothermal Area + , Dixie Valley Geothermal Area + , Raft River Geothermal Area + , Salt Wells Geothermal Area + ReferenceForControlStructure
Accommodation Zone + , Apex or Salient of Normal Fault + , Controlling Structures + , Definition: Accommodation Zone + , Definition: Apex or Salient of Normal Fault + , Definition: Displacement Transfer Zone + , Definition: Fault Intersection + , Definition: Major Normal Fault + , Definition: Pull-Apart in Strike-Slip Fault Zone + , Definition: Stepover or Relay Ramp in Normal Fault Zones + , Definition: Termination of a Major Normal Fault + , Displacement Transfer Zone + , Fault Intersection + , Major Normal Fault + , Pull-Apart in Strike-Slip Fault Zone + , Salt Wells Geothermal Area + , Stepover or Relay Ramp in Normal Fault Zones + , Termination of a Major Normal Fault + ReferenceForFauldsHinzCoolbaughCashmanKrattDeringEdwardsMayhewMcLachlan2011
Conceptual Model At Salt Wells Area (Faulds, Et Al., 2011) + , Geothermal Literature Review At Salt Wells Area (Faulds, Et Al., 2011) + Reference material
 
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