Geochemistry of K-rich alkaline lakes, Western Sandhills, Nebraska, USA

Details Geochemistry of K-rich alkaline lakes, Western Sandhills, Nebraska, USA Geochemistry of K-rich alkaline lakes, Western Sandhills, Nebraska, USA

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.1403g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 5, pp.1403-1418

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Scientific paper

The Alkali Lakes region of the western Sandhills, Nebraska, has lakes that range in composition from freshwater to brine with TDS exceeding 250,000 mg/1. An unusual geochemical feature of these lakes is the conservative behavior of K with concentrations exceeding 1,900 mmoles/kg (86,000 mg/1). The lakes are dominantly Na-K-CO 3 -(SO 4 )-(Cl) and Na-K-SO 4 -CO 3 -(Cl) waters. Lakes occupy interdunal areas where there is little or no surface runoff. Groundwater primarily from locally derived precipitation is the principle source of water and solutes. This origin for the source water contrasts with closed-basin saline lake complexes, where surface water from the adjacent areas flows directly into the lakes or recharges the groundwater system. The principle geochemical process controlling lake chemistry is evaporative concentration. Other processes are operating, but to a lesser extent; these include mineral precipitation and dissolution and organically mediated sulfate reduction. Geochemical mass-balance modeling indicates distinct differences in the amount of water that is required to be evaporated to produce the observed lake compositions. These differences are related to the groundwater inflow to outflow ratio for individual lakes. This emphasizes that, although evaporation and related processes control the geochemical evolution, the local hydrology of individual lakes regulates the extent to which these processes will proceed.

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