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Controls on the distribution and isotopic composition of helium in deep ground-water flows

Geology

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, , , , and

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Abstract

The distribution and isotopic composition of helium in sedimentary basins can be used to interpret the ages of very old ground waters. The piston-flow model commonly used in such interpretation, how ever, does not account for several important factors and as such works well only in very simple flow regimes. In this study of helium transport in a hypothetical sedimentary basin, we develop a numerical model that accounts for the magnitude and distribution of the basal helium flux, hydrodynamic dispersion, and complexities in flow regimes such as subregional flow cells. The modeling shows that these factors exert strong controls on the helium distribution and isotopic composition. The simulations may provide a basis for more accurate interpretations of observed helium concentrations and isotopic ratios in sedimentary basins.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Controls on the distribution and isotopic composition of helium in deep ground-water flows
Series title:
Geology
Volume
26
Issue:
4
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geology
First page:
291
Last page:
294
Number of Pages:
4