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Stable isotope compositions of waters in the Great Basin, United States 3. Comparison of groundwaters with modern precipitation

Journal of Geophysical Research D: Atmospheres

By:
, , , and
DOI: 10.1029/2001JD000567

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Abstract

Groundwater samples from wells and springs, scattered over most of the Great Basin province, were collected and analyzed for their isotopic makeup. They were augmented by previously published isotopic data on groundwaters from southeast California and by several hundred unpublished isotopic analyses. The ratio of 2H (deuterium, D) to 1H, in water samples from valleys in parts of California, Idaho, Nevada, Oregon, and Utah, are here compared with the winter, summer, and annual isotopic compositions of precipitation falling in or near the sampled areas. The main goal of this study was to identify basins where the groundwaters have isotopic compositions that are "lighter" (depleted in the heavier isotope, D) relative to modern winter precipitation. Where these basins do not adjoin substantially higher terrain, we consider those light groundwaters to be of Pleistocene age and thus more than 10,000 years old. Where the groundwater is 10 to 19??? lighter than local winter precipitation, we consider it to be possibly an indication of Pleistocene water; where the ??D makeup is >20??? lighter, we consider it to be probably Pleistocene water. More than 80 sites underlain by waters of possible or probable Pleistocene age were identified.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Stable isotope compositions of waters in the Great Basin, United States 3. Comparison of groundwaters with modern precipitation
Series title:
Journal of Geophysical Research D: Atmospheres
DOI:
10.1029/2001JD000567
Volume
107
Issue:
19
Year Published:
2002
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geophysical Research D: Atmospheres