The geochemistry of antarctic streams and their role in the evolution of four lakes of the McMurdo dry valleys

Details The geochemistry of antarctic streams and their role in the evolution of four lakes of the McMurdo dry valleys The geochemistry of antarctic streams and their role in the evolution of four lakes of the McMurdo dry valleys

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1265g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 5, pp.1265-1274

Mathematics

Logic

8

Scientific paper

Major ion concentrations are reported for nineteen meltwater streams in the McMurdo dry valleys, Antarctica, and for the four lakes fed by these streams. The most important solute acquisition processes for these flowing waters are dissolution of marine-derived salts, dissolution of calcite coatings derived from chemical weathering of parent rock, and direct weathering of silicates. Although Lakes Joyce, Hoare, and Fryxell have undergone significant evaporative concentration, the only simple salt which is predicted to form at present is calcite. The shallow waters of all four lakes were supersaturated with respect to this mineral, but were undersaturated with respect to other simple salts. Geochemical budgets, however, indicate that SO 4 , K, and Mg, in addition to Ca and HCO 3 , have been removed from some of these lakes over recent geological time. Bacterial sulfate reduction followed by precipitation of metal sulfides is likely to be a sink for sulfate. Sinks for Mg and K are more problematic, but may include formation of Mgcalcites and, in the case of K, reverse weathering reactions. The ages of the contemporary water columns, as indicated by chloride budgets, are relatively young, and these lakes could have evolved their chemical compositions over a few thousand years of present stream flows. It is not necessary to invoke trapped seawater or other salt sources to explain their evolution.

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