Were the Larsemann Hills ice-free through the Last Glacial Maximum?
Lake sediments in the Larsemann Hills contain a great diversity ofbiological and physical markers from which past environments can be inferred. In order to determine the timing of environmental changes it is essential to have accurate dating of sediments. We used radiometric (*loPb and I3'Cs),...
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Cambridge University Press
2001
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Online Access: | http://nora.nerc.ac.uk/id/eprint/19759/ http://journals.cambridge.org/abstract_S0954102001000608 |
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ftnerc:oai:nora.nerc.ac.uk:19759 2023-05-15T13:45:12+02:00 Were the Larsemann Hills ice-free through the Last Glacial Maximum? Hodgson, D.A. Noon, P.E. Vyverman, W. Bryant, C.L. Gore, D.B. Appleby, P. Gilmour, M. Verleyen, E. Sabbe, K. Jones, V.J. Ellis-Evans, J.C. Wood, P.B. 2001 http://nora.nerc.ac.uk/id/eprint/19759/ http://journals.cambridge.org/abstract_S0954102001000608 unknown Cambridge University Press Hodgson, D.A. orcid:0000-0002-3841-3746 Noon, P.E.; Vyverman, W.; Bryant, C.L.; Gore, D.B.; Appleby, P.; Gilmour, M.; Verleyen, E.; Sabbe, K.; Jones, V.J.; Ellis-Evans, J.C.; Wood, P.B. 2001 Were the Larsemann Hills ice-free through the Last Glacial Maximum? Antarctic Science, 13 (4). 440-454. https://doi.org/10.1017/S0954102001000608 <https://doi.org/10.1017/S0954102001000608> Publication - Article PeerReviewed 2001 ftnerc 2023-02-04T19:32:30Z Lake sediments in the Larsemann Hills contain a great diversity ofbiological and physical markers from which past environments can be inferred. In order to determine the timing of environmental changes it is essential to have accurate dating of sediments. We used radiometric (*loPb and I3'Cs), radiocarbon (AMS "C) and uranium series (2'*U) methods to date cores from eleven lakes. These were sampled on coastal to inland transects across the two mainpeninsulas, Broknes and Stornes, together with a single sample from the Bolingen Islands. Radiometric dating of recent sediments yielded *"Pb levels below acceptable detection limits. However, a relatively well-defined peak in I3'Cs gave a date marker which corresponds to the fallout maximum from the atmospheric testing of atomic weapons in 1964/65. Radiocarbon (AMS I4C) measurements showed stratigraphical consistency in the age-depth sequences and undisturbed laminae in some cores provides evidence that the sediments have remained undisturbed by glacial action. In addition, freshwater surface sediments were found to be in near-equilibrium with modern I4CO, and not influenced by radiocarbon contaminationprocesses. This dating program, together with geomorphological records of ice flow directions and glacial sediments, indicates that parts of Broknes were ice-free throughout the Last Glacial Maximum and that some lakes have existed continuously since at least 44 ka BP. Attempts to date sediments older than44 ka BP usingZ3*Ud ating were inconclusive. However, supporting evidence for Broknes being ice-free is provided by an Optically Stimulated Luminescence date from a glaciofluvial deposit. In contrast, Stornes only became ice-free in the mid to late Holocene. This contrasting glacial history results from the D%lk Glacier which diverts ice around Broknes. Lakes onBroknes and some offshore islands therefore contain the oldest known lacustrine sediment records from eastern Antarctica, with the area providing an ice-free oasis and refuge for plants and animals throughoutthe ... Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Natural Environment Research Council: NERC Open Research Archive Larsemann Hills ENVELOPE(76.217,76.217,-69.400,-69.400) Broknes ENVELOPE(76.346,76.346,-69.391,-69.391) Stornes ENVELOPE(76.099,76.099,-69.429,-69.429) Bolingen Islands ENVELOPE(75.696,75.696,-69.532,-69.532) Antarctic Science 13 4 440 454 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Lake sediments in the Larsemann Hills contain a great diversity ofbiological and physical markers from which past environments can be inferred. In order to determine the timing of environmental changes it is essential to have accurate dating of sediments. We used radiometric (*loPb and I3'Cs), radiocarbon (AMS "C) and uranium series (2'*U) methods to date cores from eleven lakes. These were sampled on coastal to inland transects across the two mainpeninsulas, Broknes and Stornes, together with a single sample from the Bolingen Islands. Radiometric dating of recent sediments yielded *"Pb levels below acceptable detection limits. However, a relatively well-defined peak in I3'Cs gave a date marker which corresponds to the fallout maximum from the atmospheric testing of atomic weapons in 1964/65. Radiocarbon (AMS I4C) measurements showed stratigraphical consistency in the age-depth sequences and undisturbed laminae in some cores provides evidence that the sediments have remained undisturbed by glacial action. In addition, freshwater surface sediments were found to be in near-equilibrium with modern I4CO, and not influenced by radiocarbon contaminationprocesses. This dating program, together with geomorphological records of ice flow directions and glacial sediments, indicates that parts of Broknes were ice-free throughout the Last Glacial Maximum and that some lakes have existed continuously since at least 44 ka BP. Attempts to date sediments older than44 ka BP usingZ3*Ud ating were inconclusive. However, supporting evidence for Broknes being ice-free is provided by an Optically Stimulated Luminescence date from a glaciofluvial deposit. In contrast, Stornes only became ice-free in the mid to late Holocene. This contrasting glacial history results from the D%lk Glacier which diverts ice around Broknes. Lakes onBroknes and some offshore islands therefore contain the oldest known lacustrine sediment records from eastern Antarctica, with the area providing an ice-free oasis and refuge for plants and animals throughoutthe ... |
format |
Article in Journal/Newspaper |
author |
Hodgson, D.A. Noon, P.E. Vyverman, W. Bryant, C.L. Gore, D.B. Appleby, P. Gilmour, M. Verleyen, E. Sabbe, K. Jones, V.J. Ellis-Evans, J.C. Wood, P.B. |
spellingShingle |
Hodgson, D.A. Noon, P.E. Vyverman, W. Bryant, C.L. Gore, D.B. Appleby, P. Gilmour, M. Verleyen, E. Sabbe, K. Jones, V.J. Ellis-Evans, J.C. Wood, P.B. Were the Larsemann Hills ice-free through the Last Glacial Maximum? |
author_facet |
Hodgson, D.A. Noon, P.E. Vyverman, W. Bryant, C.L. Gore, D.B. Appleby, P. Gilmour, M. Verleyen, E. Sabbe, K. Jones, V.J. Ellis-Evans, J.C. Wood, P.B. |
author_sort |
Hodgson, D.A. |
title |
Were the Larsemann Hills ice-free through the Last Glacial Maximum? |
title_short |
Were the Larsemann Hills ice-free through the Last Glacial Maximum? |
title_full |
Were the Larsemann Hills ice-free through the Last Glacial Maximum? |
title_fullStr |
Were the Larsemann Hills ice-free through the Last Glacial Maximum? |
title_full_unstemmed |
Were the Larsemann Hills ice-free through the Last Glacial Maximum? |
title_sort |
were the larsemann hills ice-free through the last glacial maximum? |
publisher |
Cambridge University Press |
publishDate |
2001 |
url |
http://nora.nerc.ac.uk/id/eprint/19759/ http://journals.cambridge.org/abstract_S0954102001000608 |
long_lat |
ENVELOPE(76.217,76.217,-69.400,-69.400) ENVELOPE(76.346,76.346,-69.391,-69.391) ENVELOPE(76.099,76.099,-69.429,-69.429) ENVELOPE(75.696,75.696,-69.532,-69.532) |
geographic |
Larsemann Hills Broknes Stornes Bolingen Islands |
geographic_facet |
Larsemann Hills Broknes Stornes Bolingen Islands |
genre |
Antarc* Antarctic Science Antarctica |
genre_facet |
Antarc* Antarctic Science Antarctica |
op_relation |
Hodgson, D.A. orcid:0000-0002-3841-3746 Noon, P.E.; Vyverman, W.; Bryant, C.L.; Gore, D.B.; Appleby, P.; Gilmour, M.; Verleyen, E.; Sabbe, K.; Jones, V.J.; Ellis-Evans, J.C.; Wood, P.B. 2001 Were the Larsemann Hills ice-free through the Last Glacial Maximum? Antarctic Science, 13 (4). 440-454. https://doi.org/10.1017/S0954102001000608 <https://doi.org/10.1017/S0954102001000608> |
container_title |
Antarctic Science |
container_volume |
13 |
container_issue |
4 |
container_start_page |
440 |
op_container_end_page |
454 |
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1766216863842304000 |