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Lookup NU author(s): David Banks
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The Shira region of Khakassia in southern Siberia exhibits many features governing the evolution of groundwater and surface-water chemistry that are common to other cold, semi-arid areas of the world: (1) a continental climate, (2) location in a rain shadow, (3) low density of surface-water drainage, (4) occurrence of saline lakes, and (5) occurrence of palaeo- and modern evaporite mineralisation. In lowland areas of Shira, the more saline groundwaters and lake waters have a sodium-sulphate (-chloride) composition. Results of thermodynamic modelling suggest that these evolve by a combination of silicate weathering and gypsum and halite dissolution, coupled with carbonate precipitation to remove calcium and bicarbonate ions. An approximately 1:1 sodium:sulphate ratio occurs even in groundwaters from non-evaporite-bearing aquifers. This may indicate the formation of secondary sodium sulphate evaporites (in or near saline lakes or in soil profiles where the water table is shallow), which are subsequently distributed throughout the study area by atmospheric transport. Several urban groundwaters are characterised by very high nitrate concentrations, conceivably derived from sewage/latrine leakage.
Author(s): Banks D; Parnachev VP; Berezovsky AY; Garbe-Schönberg D
Publication type: Article
Publication status: Published
Journal: Hydrogeology Journal
Year: 1999
Volume: 7
Issue: 6
Pages: 546-560
Print publication date: 10/12/1999
ISSN (print): 1431-2174
ISSN (electronic): 1435-0157
Publisher: Springer
URL: http://dx.doi.org/10.1007/s100400050228
DOI: 10.1007/s100400050228
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