Articles | Volume 5, issue 1
https://doi.org/10.5194/gchron-5-229-2023
https://doi.org/10.5194/gchron-5-229-2023
Research article
 | 
04 May 2023
Research article |  | 04 May 2023

Ultra-distal tephra deposits and Bayesian modelling constrain a variable marine radiocarbon offset in Placentia Bay, Newfoundland

Alistair J. Monteath, Matthew S. M. Bolton, Jordan Harvey, Marit-Solveig Seidenkrantz, Christof Pearce, and Britta Jensen

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Cited articles

Abbott, P. M., Griggs, A. J., Bourne, A. J., and Davies, S. M.: Tracing marine cryptotephras in the North Atlantic during the last glacial period: Protocols for identification, characterisation and evaluating depositional controls, Mar. Geol., 401, 81–97, https://doi.org/10.1016/j.margeo.2018.04.008, 2018a. 
Abbott, P. M., Griggs, A. J., Bourne, A. J., Chapman, M. R., and Davies, S. M.: Tracing marine cryptotephras in the North Atlantic during the last glacial period: Improving the North Atlantic marine tephrostratigraphic framework, Quaternary Sci. Rev., 189, 169–186, https://doi.org/10.1016/j.quascirev.2018.03.023, 2018b. 
Alves, E. Q., Macario, K., Ascough, P., and Bronk Ramsey, C.: The worldwide marine radiocarbon reservoir effect: definitions, mechanisms, and prospects, Rev. Geophys., 56, 278–305, https://doi.org/10.1002/2017RG000588, 2018. 
Ascough, P., Cook, G., and Dugmore, A.: Methodological approaches to determining the marine radiocarbon reservoir effect, Prog. Phys. Geogr., 29, 532–547, https://doi.org/10.1191/0309133305pp461ra, 2005. 
Blockley, S. P., Pyne–O'Donnell, S. D., Lowe, J. J., Matthews, I. P., Stone, A., Pollard, A. M., Turney, C. S., and Molyneux, E. G.: A new and less destructive laboratory procedure for the physical separation of distal glass tephra shards from sediments, Quaternary Sci. Rev., 24, 1952–1960, https://doi.org/10.1016/j.quascirev.2004.12.008, 2005. 
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Short summary
Accurately dating ocean cores is challenging because the radiocarbon age of water masses varies substantially. We identify ash fragments from eruptions more than 4000 km from their source and use these time markers to develop a new age–depth model for an ocean core in Placentia Bay, North Atlantic. Our results show that the radiocarbon age of waters masses in the bay varied considerably during the last 10 000 years and highlight the potential of using ultra-distal ash deposits in this region.