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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Bibliographic Details
Main Authors: Lisé-Pronovost, Agathe, Fletcher, Michael-Shawn, Simon, Quentin, Jacobs, Zenobia, Gadd, Patricia S, Heslop, David, Herries, Andy IR, Yokoyama, Yusuke
Format: Dataset
Language:English
Published: PANGAEA 2021
Subjects:
Paleomagnetic data
Core
Antarctic
Antarc*
ice core
Online Access:https://dx.doi.org/10.1594/pangaea.931786
https://doi.pangaea.de/10.1594/PANGAEA.931786
Description
Summary: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 ...

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