Geochemical and isotopic constraints on the interaction between saline lakes and groundwater in southeast Australia

Cartwright, Ian, Hall, Sharon, Tweed, Sarah, and LeBlanc, Marc (2009) Geochemical and isotopic constraints on the interaction between saline lakes and groundwater in southeast Australia. Hydrogeology Journal, 17 (8). pp. 1991-2004.

[img] PDF (Published Version)
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1007/s10040-009-049...

Abstract

Major ion and stable isotope geochemistry allow groundwater/surface-water interaction associated with saline to hypersaline lakes from the Willaura region of Australia to be understood. Ephemeral lakes lie above the water table and locally contain saline water (total dissolved solids, TDS, contents up to 119,000 mg/L). Saline lakes that lack halite crusts and which have Cl/Br ratios similar to local surface water and groundwater are throughflow lakes with high relative rates of groundwater outflows. Permanent hypersaline lakes contain brines with TDS contents of up to 280,000 mg/L and low Cl/Br ratios due to the formation of halite in evaporite crusts. These lakes are throughflow lakes with relatively low throughflow rates relative to evaporation or terminal discharge lakes. Variations in stable isotope and major ion geochemistry show that the hypersaline lakes undergo seasonal cycles of mineral dissolution and precipitation driven by the influx of surface water and evaporation. Despite the generation of highly saline brines in these lakes, leakage from the adjacent ephemeral lakes or saline throughflow lakes that lack evaporite crusts is mainly responsible for the high salinity of shallow groundwater in this region.

Item ID: 4913
Item Type: Article (Refereed Research - C1)
Keywords: groundwater/surface-water relations, stable isotopes, hydrochemistry, salinisation, Australia
ISSN: 1435-0157
Date Deposited: 25 Aug 2009 03:11
FoR Codes: 04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology @ 50%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040608 Surfacewater Hydrology @ 50%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961103 Physical and Chemical Conditions of Water in Fresh, Ground and Surface Water Environments (excl. Urban and @ 100%
Citation Count from Web of Science Web of Science 14
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page