Factors controlling As and U in shallow ground water, southern Carson Desert, Nevada

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doi: 10.1016/S0883-2927(97)00083-8
Authors:Welch, Alan H.; Lico, Michael S.
Author Affiliations:Primary:
U. S. Geological Survey, Carson City, NV, United States
Volume Title:Applied Geochemistry
Source:Applied Geochemistry, 13(4), p.521-539. Publisher: Pergamon, Oxford-New York-Beijing, International. ISSN: 0883-2927
Publication Date:1998
Note:In English. 66 refs.; illus., incl. sects., 6 tables, sketch maps
Summary:Unusually high concentrations (> 100 µg/litre) of As and U are widespread in shallow ground water used for domestic supply beneath the S Carson Desert. These As and U concentrations are affected by evaporative concentration and redox reactions involving metal oxides and sedimentary-organic matter. Arsenic in Fe-oxide was confirmed by chemical extraction and is consistent with laboratory adsorption studies. Although As concentrations in the ground water and chemical extracts of aquifer sediments are broadly consistent with adsorption as a control on some dissolved As concentrations evidence for adsorption should be viewed with caution because the adsorption model used values for the adsorbent that have not been shown to be valid for the aquifer sediments throughout the Carson Desert. Hydrological and geochemical condition in the Carson Desert are similar to other areas with high groundwater concentrations of U and As. The Carson Desert may be a modern analogue for sandstone-type U-ore deposits such as those in the non-marine, closed-basin sediments of the Morrison formation near Grants, New Mexico.
Subjects:Actinides; Adsorption; Aquifers; Arsenic; Controls; Eh; Evaporation; Geochemistry; Ground water; Hydrochemistry; Jurassic; Medical geology; Mesozoic; Metals; Mineral deposits, genesis; Modern analogs; Morrison Formation; Pollutants; Pollution; Sampling; Sandstone-type deposits; Sediments; Shallow aquifers; Solutes; Thermodynamic properties; Upper Jurassic; Uranium; California; Grants New Mexico; Nevada; New Mexico; Salton Sea; San Joaquin Valley; United States; Valencia County New Mexico; Western U.S.; Carson Desert; Carson Lake; Fallon Lake; Lead Lake
Record ID:1998045056
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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