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

Agathe Lise-Pronovost; Michael-Shawn Fletcher; Quentin Simon; Zenobia Jacobs; Patricia S Gadd; David Hestop; Andy IR Herries; Yusuke Yokoyama; Aster Team

Journal article

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

Agathe Lise-Pronovost, Michael-Shawn Fletcher, Quentin Simon, Zenobia Jacobs, Patricia S Gadd, David Hestop, Andy IR Herries, Yusuke Yokoyama, Aster Team

QUATERNARY GEOCHRONOLOGY | ELSEVIER SCI LTD | Published : 2021

DOI: 10.1016/j.quageo.2021.101152

Abstract

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..

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University of Melbourne Researchers

Michael-Shawn Fletcher Author Geography, Earth and Atmospheric Sciences

Agathe Lise-Pronovost Author Geography, Earth and Atmospheric Sciences

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Grants

Awarded by Australian Research Council

Funding Acknowledgements

Thanks to the TAS1402 drilling team (Kristen K. Beck, Alexa Benson, Angelica Ramirez, William Rapuc, Anthony Romano) and the data science support team (Milan Korbel, Shashwat Pathak, Lachlan Simpson) . This research was supported by use of the Nectar Research Cloud; a collaborative Australian research platform supported by the National Collaborative Research Infrastructure Strategy (NCRIS) . We thank Maarten Blaauw for support with rbacon and Xiang Zhao and Andrew Roberts for assistance at the Paleomagnetism Laboratory at the Australian National University. This project was funded by the Australian Research Council Discovery Indigenous IN140100050 to M.-S. Fletcher and IN170100062 to M.-S. Fletcher and A. Lise-Pronovost. A. Lise-Pronovost was supported by a La Trobe University DVCR Fellowship and a University of Melbourne McKenzie Fellowship. D. Heslop was supported by the Australian Research Council (DP190100874) . The ASTER AMS national facility (CEREGE, Aix en Provence) is supported by INSU/CNRS, ANR through the EQUIPEX "ASTER-CEREGE" action, and IRD.