Age determination and sedimentology on profile Lz1020 from Lake Hoare, Antarctica ...

• Main Authors: Wagner, Bernd, Ortlepp, Sabrina, Doran, Peter T, Kenig, Fabien, Melles, Martin, Burkemper, Andy
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2012
• Subjects: Composite Core; TaylorValley2002; Sampling/drilling in lake; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Arctic; Antarctic; Victoria Land; Taylor Valley; Fryxell; Hoare; Lake Fryxell; Washburn; Lake Hoare; Antarc*; Antarctica; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.798405; https://doi.pangaea.de/10.1594/PANGAEA.798405

Up to 2.3 m long sediment sequences were recovered from the deepest part of Lake Hoare in Taylor Valley, southern Victoria Land, Antarctica. Sedimentological, biogeochemical, and mineralogical analyses revealed a high spatial variability of these parameters in Lake Hoare. Five distinct lithological units were recognized. Radiocarbon dating of bulk organic carbon samples from the sediment sequences yielded apparently too old ages and significant age reversals, which prevented the establishment of reliable age-depth models. However, cross correlation of the sedimentary characteristics with those of sediment records from neighbouring Lake Fryxell indicates that the lowermost two units of the Lake Hoare sediment sequences were probably deposited during the final phase of proglacial Lake Washburn, which occupied Taylor Valley during the late Pleistocene and early Holocene. High amounts of angular gravel and the absence of fine-grained material imply a complete desiccation with subaerial conditions in the Lake ... : German Research Foundation (DFG) grant no. ME 1169/11 and National Science Foundation (NSF) OPP 0096250, 0126270 ...