Wagner, Bernd; Ortlepp, Sabrina; Doran, Peter T; Kenig, Fabien; Melles, Martin; Burkemper, Andy (2012): Age determination and sedimentology on profile Lz1020 from Lake Hoare, Antarctica [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.798405, Supplement to: Wagner, B et al. (2011): The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores. Antarctic Science, 23(3), 307-319, https://doi.org/10.1017/S0954102011000125
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Abstract:
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 Hoare basin in the middle of the Holocene. The late Holocene (< c. 3300 calendar yr BP) is characterized by the establishment of environmental conditions similar to those existing today. A late Holocene desiccation event, such as proposed in former studies, is not indicated in the sediment sequences recovered.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Latitude: -77.628760 * Longitude: 162.882230
Date/Time Start: 2003-01-01T00:00:00 * Date/Time End: 2003-01-01T00:00:00
Event(s):
Lz1020 * Latitude: -77.628760 * Longitude: 162.882230 * Date/Time: 2003-01-01T00:00:00 * Elevation: 73.0 m * Lake water depth: 32.6 m * Recovery: 2.3 m * Location: Lake Hoare, Taylor Valley, East Antarctica * Campaign: TaylorValley2002 * Basis: Sampling/drilling in lake * Method/Device: Composite Core (COMPCORE)
Comment:
German Research Foundation (DFG) grant no. ME 1169/11 and National Science Foundation (NSF) OPP 0096250, 0126270
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Wagner, B; Ortlepp, S; Doran, PT et al. (2011): Table I. Radiocarbon dates of the humic acid free fraction (HAF), and the humic acid fraction (HA) from bulk sediment samples of cores Lz1020, Lake Hoare. https://doi.org/10.1594/PANGAEA.759992
- Wagner, B; Ortlepp, S; Doran, PT et al. (2012): Fig. 3. Lithology and sedimentology on profile Lz1020. https://doi.org/10.1594/PANGAEA.798404