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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: Combining radiometric, geomagnetic and climatic dating
Quaternary Geochronology, Volume 62, Article 101152, Year 2021
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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 10Be/9Be 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. © 2021 Elsevier B.V.
Authors & Co-Authors
Fletcher, Michael Shawn
Australia, Melbourne
University of Melbourne
Jacobs, Zenobia
Australia, Wollongong
Arc Centre of Excellence for Australian Biodiversity and Heritage
Heslop, David
Australia, Canberra
The Australian National University
Herries, Andy I.R.
Australia, Melbourne
La Trobe University
Team, Aster
France, Aix-en-provence
Centre Européen de Recherche et D’enseignement de Géosciences de L’environnement
Statistics
Citations: 2
Authors: 5
Affiliations: 7
Identifiers
Doi:
10.1016/j.quageo.2021.101152
ISSN:
18711014
Research Areas
Environmental