Flow of mantle fluids through the ductile lower crust: Heliumisotope trends

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Heat and mass are injected into the shallow crust when mantle fluids are able to flow through the ductile lower crust. Minimum 3He/4He ratios in surface fluids from the northern Basin and Range province, western North America increase systematically from low, crustal values in the east to high, mantle values in the west, a regional trend that correlates with the rates of active crustal deformation. The highest ratios occur where the extension and shear strain rates are greatest. The correspondence of helium isotope ratios and active trans-tensional deformation indicates a deformation enhanced permeability and that mantle fluids can penetrate the ... continued below

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Kennedy, B. Mack & van Soest, Matthijs C. October 7, 2007.

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Heat and mass are injected into the shallow crust when mantle fluids are able to flow through the ductile lower crust. Minimum 3He/4He ratios in surface fluids from the northern Basin and Range province, western North America increase systematically from low, crustal values in the east to high, mantle values in the west, a regional trend that correlates with the rates of active crustal deformation. The highest ratios occur where the extension and shear strain rates are greatest. The correspondence of helium isotope ratios and active trans-tensional deformation indicates a deformation enhanced permeability and that mantle fluids can penetrate the ductile lithosphere in regions even where there is no significant magmatism. Superimposed on the regional trend are local, high-{sup 3}He/{sup 4}He anomalies signifying hidden magmatic activity and/or deep fluid production with locally enhanced permeability, identifying zones with high resource potential, particularly for geothermal energy development.

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  • Journal Name: Science; Journal Volume: 318; Journal Issue: 5855; Related Information: Journal Publication Date: 11/30/2007

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  • Report No.: LBNL--63575
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1126/science.1147537 | External Link
  • Office of Scientific & Technical Information Report Number: 927196
  • Archival Resource Key: ark:/67531/metadc896306

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  • October 7, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 11:44 a.m.

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Kennedy, B. Mack & van Soest, Matthijs C. Flow of mantle fluids through the ductile lower crust: Heliumisotope trends, article, October 7, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc896306/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.