Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating
Lake sediment archives covering several glacial cycles are scarce in the Southern Hemisphere and they are challenging to date. Here we present the chronostratigraphy of the oldest continuous lake sediment archive in Tasmania, Australia; a 5.5 m and 270 ka (Marine Isotope Stage 8) sediment core from...
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ftunivwollongong:oai:ro.uow.edu.au:test2021-1409 2023-05-15T13:57:48+02:00 Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating Lisé-Pronovost, Agathe Fletcher, Michael Shawn Simon, Quentin Jacobs, Zenobia Gadd, Patricia S. Heslop, David Herries, Andy I.R. Yokoyama, Yusuke team, Aster 2021-03-01T08:00:00Z https://ro.uow.edu.au/test2021/400 https://doi.org/10.1016/j.quageo.2021.101152 unknown Research Online https://ro.uow.edu.au/test2021/400 https://doi.org/10.1016/j.quageo.2021.101152 Test Series for Scopus Harvesting 2021 Australia Authigenic 10Be/9Be ratio Lake sediment Optically stimulated luminescence Paleomagnetism Pleistocene Radiocarbon text 2021 ftunivwollongong https://doi.org/10.1016/j.quageo.2021.101152 2021-04-19T22:23:48Z Lake sediment archives covering several glacial cycles are scarce in the Southern Hemisphere and they are challenging to date. Here we present the chronostratigraphy of the oldest continuous lake sediment archive in Tasmania, Australia; a 5.5 m and 270 ka (Marine Isotope Stage 8) sediment core from Lake Selina. We employ radiometric dating (radiocarbon and optically stimulated luminescence) and relative dating (geomagnetic and climate comparisons). Bayesian modeling of the radiometric ages reaches back to 80 ka (1.7 m) and relative dating using a dynamic programing algorithm allows dating of the full sequence. Elemental data, magnetic properties and beryllium isotopes from Lake Selina reveal a close fit to Antarctic ice core climate proxies. Weaker correlation during the Last Glacial Period (MIS 2–4) is attributed to additional local factors impacting Lake Selina proxies at a time of climate changes and human arrival into Tasmania. Over that period, full vector paleomagnetic records and authigenic Be/ Be ratios are combined to identify the Laschamp geomagnetic excursion for the first time in Australia and constrain the chronology. The multi-method approach provides two preferred age models, indiscernible within their uncertainties, which allows the use of a geomagnetic dipole-independent (full archive) or a climate-independent (111 ka to present) age model. 10 9 Text Antarc* Antarctic ice core University of Wollongong, Australia: Research Online Antarctic Quaternary Geochronology 62 101152 |
institution |
Open Polar |
collection |
University of Wollongong, Australia: Research Online |
op_collection_id |
ftunivwollongong |
language |
unknown |
topic |
Australia Authigenic 10Be/9Be ratio Lake sediment Optically stimulated luminescence Paleomagnetism Pleistocene Radiocarbon |
spellingShingle |
Australia Authigenic 10Be/9Be ratio Lake sediment Optically stimulated luminescence Paleomagnetism Pleistocene Radiocarbon Lisé-Pronovost, Agathe Fletcher, Michael Shawn Simon, Quentin Jacobs, Zenobia Gadd, Patricia S. Heslop, David Herries, Andy I.R. Yokoyama, Yusuke team, Aster Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating |
topic_facet |
Australia Authigenic 10Be/9Be ratio Lake sediment Optically stimulated luminescence Paleomagnetism Pleistocene Radiocarbon |
description |
Lake sediment archives covering several glacial cycles are scarce in the Southern Hemisphere and they are challenging to date. Here we present the chronostratigraphy of the oldest continuous lake sediment archive in Tasmania, Australia; a 5.5 m and 270 ka (Marine Isotope Stage 8) sediment core from Lake Selina. We employ radiometric dating (radiocarbon and optically stimulated luminescence) and relative dating (geomagnetic and climate comparisons). Bayesian modeling of the radiometric ages reaches back to 80 ka (1.7 m) and relative dating using a dynamic programing algorithm allows dating of the full sequence. Elemental data, magnetic properties and beryllium isotopes from Lake Selina reveal a close fit to Antarctic ice core climate proxies. Weaker correlation during the Last Glacial Period (MIS 2–4) is attributed to additional local factors impacting Lake Selina proxies at a time of climate changes and human arrival into Tasmania. Over that period, full vector paleomagnetic records and authigenic Be/ Be ratios are combined to identify the Laschamp geomagnetic excursion for the first time in Australia and constrain the chronology. The multi-method approach provides two preferred age models, indiscernible within their uncertainties, which allows the use of a geomagnetic dipole-independent (full archive) or a climate-independent (111 ka to present) age model. 10 9 |
format |
Text |
author |
Lisé-Pronovost, Agathe Fletcher, Michael Shawn Simon, Quentin Jacobs, Zenobia Gadd, Patricia S. Heslop, David Herries, Andy I.R. Yokoyama, Yusuke team, Aster |
author_facet |
Lisé-Pronovost, Agathe Fletcher, Michael Shawn Simon, Quentin Jacobs, Zenobia Gadd, Patricia S. Heslop, David Herries, Andy I.R. Yokoyama, Yusuke team, Aster |
author_sort |
Lisé-Pronovost, Agathe |
title |
Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating |
title_short |
Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating |
title_full |
Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating |
title_fullStr |
Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating |
title_full_unstemmed |
Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating |
title_sort |
chronostratigraphy of a 270-ka sediment record from lake selina, tasmania: combining radiometric, geomagnetic and climatic dating |
publisher |
Research Online |
publishDate |
2021 |
url |
https://ro.uow.edu.au/test2021/400 https://doi.org/10.1016/j.quageo.2021.101152 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_source |
Test Series for Scopus Harvesting 2021 |
op_relation |
https://ro.uow.edu.au/test2021/400 https://doi.org/10.1016/j.quageo.2021.101152 |
op_doi |
https://doi.org/10.1016/j.quageo.2021.101152 |
container_title |
Quaternary Geochronology |
container_volume |
62 |
container_start_page |
101152 |
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1766265688502042624 |