The application of pollen radiocarbon dating and bayesian age-depth modeling for developing robust geochronological frameworks of wetland archives

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dc.contributor.authorCadd, Hen_AU
dc.contributor.authorSherborne-Higgins, Ben_AU
dc.contributor.authorBecerra-Valdivia, Len_AU
dc.contributor.authorTibby, Jen_AU
dc.contributor.authorBarr, Cen_AU
dc.contributor.authorForbes, MSen_AU
dc.contributor.authorCohen, TJen_AU
dc.contributor.authorTyler, JJen_AU
dc.contributor.authorVandergoes, MJen_AU
dc.contributor.authorFrancke, Aen_AU
dc.contributor.authorLewis, RJen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorMarjo, CEen_AU
dc.contributor.authorTurney, CSMen_AU
dc.contributor.authorArnold, LJen_AU
dc.date.accessioned2023-11-19T22:50:44Zen_AU
dc.date.available2023-11-19T22:50:44Zen_AU
dc.date.issued2022-04-27en_AU
dc.date.statistics2022-05-26en_AU
dc.description.abstractWetland sediments are valuable archives of environmental change but can be challenging to date. Terrestrial macrofossils are often sparse, resulting in radiocarbon (14C) dating of less desirable organic fractions. An alternative approach for capturing changes in atmospheric 14C is the use of terrestrial microfossils. We 14C date pollen microfossils from two Australian wetland sediment sequences and compare these to ages from other sediment fractions (n = 56). For the Holocene Lake Werri Berri record, pollen 14C ages are consistent with 14C ages on bulk sediment and humic acids (n = 14), whilst Stable Polycyclic Aromatic Carbon (SPAC) 14C ages (n = 4) are significantly younger. For Welsby Lagoon, pollen concentrate 14C ages (n = 21) provide a stratigraphically coherent sequence back to 50 ka BP. 14C ages from humic acid and >100 µm fractions (n = 13) are inconsistent, and often substantially younger than pollen ages. Our comparison of Bayesian age-depth models, developed in Oxcal, Bacon and Undatable, highlight the strengths and weaknesses of the different programs for straightforward and more complex chrono-stratigraphic records. All models display broad similarities but differences in modeled age-uncertainty, particularly when age constraints are sparse. Intensive dating of wetland sequences improves the identification of outliers and generation of robust age models, regardless of program used. © The Author(s), 2022. Published by Cambridge University Press for the Arizona Board of Regents on behalf of the University of Arizonaen_AU
dc.description.sponsorshipWe acknowledge Minjerribah (North Stradbroke Island) and the surrounding waters as Quandamooka Country and thank the Quandamooka Yoolooburrabee Aboriginal Corporation for permission to undertake the work. We acknowledge the area of the Nattai System of Reserves and Thirlmere Lakes National Parks as D’harawal country. We thank Jonathan Marshall, Glenn McGregor, and Cameron Shultz for assistance in many aspects of the Minjerribah project. The work was supported by the Australian Research Council (ARC) Discovery Project (DP150103875) and the ARC Centre of Excellence for Australian Biodiversity and Heritage (CABAH, Project Number CE170100015). Radiocarbon dating at the Centre for Accelerator Science, ANSTO was conducted with the support of ANSTO grant AP11938 to Tim Cohen and by an AINSE Ltd. Honours Scholarship to Bryce Sherborne-Higgins.en_AU
dc.identifier.citationCadd, H., Sherborne-Higgins, B., Becerra-Valdivia, L., Tibby, J., Barr, C., Forbes, M., Cohen, T. J., Tyler, J., Vandergoes, M., Francke, A., Lewis, R., Arnold, L. J., Jacobsen, G., Marjo, C., & Turney, C. (2022). The application of pollen radiocarbon dating and bayesian age-depth modeling for developing robust geochronological frameworks of wetland archives. Radiocarbon, 64(2), 213-235. doi:10.1017/RDC.2022.29en_AU
dc.identifier.issn0033-8222en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleRadiocarbonen_AU
dc.identifier.pagination213-235en_AU
dc.identifier.urihttps://doi.org/10.1017/RDC.2022.29en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15207en_AU
dc.identifier.volume64en_AU
dc.language.isoenen_AU
dc.publisherCambridge University Press for the Arizona Board of Regents on behalf of the University of Arizonaen_AU
dc.relation.urihttps://doi.org/10.1017/RDC.2022.29en_AU
dc.subjectMass spectrometryen_AU
dc.subjectAcceleratorsen_AU
dc.subjectCharcoalen_AU
dc.subjectClimatic changeen_AU
dc.subjectAge estimationen_AU
dc.subjectLuminescenceen_AU
dc.subjectPollenen_AU
dc.subjectCarbon 14en_AU
dc.subjectWetlandsen_AU
dc.titleThe application of pollen radiocarbon dating and bayesian age-depth modeling for developing robust geochronological frameworks of wetland archivesen_AU
dc.typeJournal Articleen_AU
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