Geochemistry, grain sizes and radiocarbon age of sediment core Lz1005 from Amery Oasis, East Antarctica

• Main Authors: Hultzsch, Nadja, Wagner, Bernd, Diekmann, Bernhard, White, Duanne A
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 2008
• Subjects: AmeryOasis2001/2002; AWI_PerDyn; COMPCORE; Composite Core; Lake Terrasovoje; East Antarctica; Lz1005; Permafrost Research (Periglacial Dynamics) @ AWI; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; Sampling/drilling in lake; SPP1158; Antarc*; Antarctic; Antarctic Science; Antarctica; Berichte zur Polar- und Meeresforschung; Ice; permafrost; Reports on Polar and Marine Research; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.847418; https://doi.org/10.1594/PANGAEA.847418

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.