Mineralogical implications for the Late Pleistocene glaciation in Amery Oasis, East Antarctica, from a lake sediment core

Abstract 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 sedime...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Hultzsch, Nadja, Wagner, Bernd, Diekmann, Bernhard, White, Duanne
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2008
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
East Antarctica
Amery
Nemesis Glacier
Antarc*
Antarctic Science
Antarctica
Online Access:http://dx.doi.org/10.1017/s0954102007000880
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102007000880
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Summary:Abstract 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.

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