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

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...

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Bibliographic Details
Main Authors: Wagner, Bernd, Ortlepp, Sabrina, Doran, Peter T, Kenig, Fabien, Melles, Martin, Burkemper, Andy
Format: Dataset
Language:English
Published: PANGAEA 2012
Subjects:
COMPCORE
Composite Core
Lake Hoare
Taylor Valley
East Antarctica
Lz1020
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Sampling/drilling in lake
SPP1158
TaylorValley2002
Antarctic
Arctic
Fryxell
Hoare
Lake Fryxell
Victoria Land
Washburn
Antarc*
Antarctic Science
Antarctica
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.798405
https://doi.org/10.1594/PANGAEA.798405
Description
Summary: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.

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