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Deep permeable fault-controlled helium transport and limited mantle flux in two extensional geothermal systems in the Great Basin, United States

Amlan Banerjee, Mark Person, Albert H. Hofstra, Donald S. Sweetkind, Denis Cohen, Andrew Sabin, Jeff Unruh, George Zyvoloski, Carl W. Gable, Laura J. Crossey and Karl Karlstrom
Deep permeable fault-controlled helium transport and limited mantle flux in two extensional geothermal systems in the Great Basin, United States
Geology (Boulder) (March 2011) 39 (3): 195-198

Abstract

This study assesses the relative importance of deeply circulating meteoric water and direct mantle fluid inputs on near-surface (super 3) He/ (super 4) He anomalies reported at the Coso and Beowawe geothermal fields of the western United States. The depth of meteoric fluid circulation is a critical factor that controls the temperature, extent of fluid-rock isotope exchange, and mixing with deeply sourced fluids containing mantle volatiles. The influence of mantle fluid flux on the reported helium anomalies appears to be negligible in both systems. This study illustrates the importance of deeply penetrating permeable fault zones (10 (super -12) to 10 (super -15) m (super 2) ) in focusing groundwater and mantle volatiles with high (super 3) He/ (super 4) He ratios to shallow crustal levels. These continental geothermal systems are driven by free convection.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 39
Serial Issue: 3
Title: Deep permeable fault-controlled helium transport and limited mantle flux in two extensional geothermal systems in the Great Basin, United States
Affiliation: New Mexico Institute of Mining and Technology, Department of Earth and Environmental Sciences, Socorro, NM, United States
Pages: 195-198
Published: 201103
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 21
Accession Number: 2011-028190
Categories: Economic geology, geology of energy sourcesIsotope geochemistryStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2011081
Illustration Description: illus. incl. sects., geol. sketch map
N36°01'60" - N36°02'60", W117°46'60" - W117°45'00"
N40°30'00" - N40°45'00", W117°00'00" - W116°30'00"
Secondary Affiliation: U. S. Geological Survey, USA, United StatesIowa State University, USA, United StatesU. S. Navy Geothermal Program Office, USA, United StatesWilliam Lettis & Associates, USA, United StatesLos Alamos National Laboratory, USA, United StatesUniversity of New Mexico, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201116
Program Name: USGSOPNon-USGS publications with USGS authors
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