Abstract
Abstract Mechanisms of carbonate deposition in Lake Fryxeli, Taylor Valley, Antarctica (75° 35′S, 163° 35′E) have been investigated. The lake lies within an area once covered by Ross Sea 1 ice (c. 20 000 years ago) and its proglacial lake. Lake sediments consist of five units, unit A being the lowermost deposit cored and unit E the uppermost. Three phases of carbonate deposition are evident in these sediments and result from climate changes associated with ice advances and retreat. 1. About 20 000 years ago, a calcareous mud (unit B) was deposited in a deep proglacial Lake Washburn. The carbonate is of biogenic origin, and mixed calcite/ aragonite mineralogy. Aragonite is the dominant phase. 2. About 10 000 years ago the ice had retreated beyond the basin margins and the large volume of water then covered areas once under ice. This spreading of lake waters increased the ablation surface, resulting in evaporative concentration of lake waters, and a reduction in lake levels. Brine concentration caused the p...
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