The clay mineralogical composition of a 552 cm long sediment core from Lake Terrasovoje in Amery Oasis, East Antarctica, was analysed and compared with that in surface sediments from other locations in the vicinity. The lower part of the sediment core is formed by sub- and proglacial sediments with a dominance of smectite and illite, and lower amounts of kaolinite and chlorite. The upper part of the core is deposited after 12 500 cal yr bp and mainly composed of illite and kaolinite, with low amounts of smectite and chlorite, such as found in samples from rock outcrops and covering sediments throughout Amery Oasis. The clay composition in the lower section of core Lz1005 suggest that the basin of Lake Terrasovoje was filled by a 150-200 m thickened Nemesis Glacier prior to 12 500 cal yr bp rather than by local ice caps.
Cremer, Holger; Heiri, Oliver; Wagner, Bernd; Wagner-Cremer, F (2007): Abrupt climate warming in East Antarctica during the early Holocene. Quaternary Science Reviews, 26(15-16), 2012-2018, doi:10.1016/j.quascirev.2006.09.011
Hultzsch, Nadja (2007): Lakustrine Sedimente als Archive des spätquartären Umweltwandels in der Amery-Oase, Ostantarktis (The Late Quaternary climatic and environmental history of Amery Oasis, East Antarctica). Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 545, 168 pp, doi:10.2312/BzPM_0545_2007
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Fonte
Supplement to: Hultzsch, Nadja; Wagner, Bernd; Diekmann, Bernhard; White, Duanne A (2008): Mineralogical implications for the Late Pleistocene glaciation in Amery Oasis, East Antarctica, from a lake sediment core. Antarctic Science, 20(02), 169-172, doi:10.1017/S0954102007000880
