Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: combining radiometric, geomagnetic and climatic dating

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dc.contributor.authorLisé-Pronovost, Aen_AU
dc.contributor.authorFletcher, MSen_AU
dc.contributor.authorSimon, Qen_AU
dc.contributor.authorJacobs, Zen_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorHeslop, Den_AU
dc.contributor.authorHerries, AIRen_AU
dc.contributor.authorYokayama, Yen_AU
dc.date.accessioned2021-06-10T02:08:30Zen_AU
dc.date.available2021-06-10T02:08:30Zen_AU
dc.date.issued2021-03-01en_AU
dc.date.statistics2021-06-04en_AU
dc.description.abstractLake 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.en_AU
dc.identifier.articlenumber101152en_AU
dc.identifier.citationLisé-Pronovost, A., Fletcher, M.-S., Simon, Q., Jacobs, Z., Gadd, P. S., Heslop, D., Herries, A. I. R. & Yokoyama, Y. (2021). Chronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: combining radiometric, geomagnetic and climatic dating. Quaternary Geochronology, 62, 101152. doi:10.1016/j.quageo.2021.101152en_AU
dc.identifier.issn1871-1014en_AU
dc.identifier.journaltitleQuaternary Geochronologyen_AU
dc.identifier.urihttps://doi.org/10.1016/j.quageo.2021.101152en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10845en_AU
dc.identifier.volume62en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectPaleomagnetismen_AU
dc.subjectLuminescenceen_AU
dc.subjectCarbon 14en_AU
dc.subjectPleistocene epochen_AU
dc.subjectLakesen_AU
dc.subjectSedimentsen_AU
dc.subjectAustraliaen_AU
dc.titleChronostratigraphy of a 270-ka sediment record from Lake Selina, Tasmania: combining radiometric, geomagnetic and climatic datingen_AU
dc.typeJournal Articleen_AU
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