Geochemical study of the formation process for saline lakes in the dry valleys, south Victoria Land, Antarctica.
A simple model is proposed for the present chemical composition of the saline lakes in the dry valleys. A diluted solution of sea salt whose compositional ratiro was that of sea water was concentrated by evaporation to the present chlorintiy. During the concentration process, solium and potassium ions replaced calcium and magnesium ions in sediments or weathering rock, and part of CaSO4 deposited from the solution. All reactions proceeded under an ionic mass balance. This simple idea can beautifully explain the origin of the chemical composition of Lakes Vanda and Bonney. The salt concentration profiles in these saline lakes can be explained by the molecular diffusion (or ionic diffusion) of dissolved chemical substances from the bottom layer to the surface layer. The age of stratification estimated for the salt diffusion from the bottom layers ranges from 1,000 to 1,250 years.
Nakaya, S.; Nishimura, M. Geochemical study of the formation process for saline lakes in the dry valleys, south Victoria Land, Antarctica. Antarctic Recordno.58:89-92, 1977