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Geochronology Advances in geochronological science
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https://doi.org/10.5194/gchron-2019-16
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-2019-16
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 07 Nov 2019

Submitted as: research article | 07 Nov 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geochronology (GChron).

A new 30,000 year chronology for rapidly deposited sediments on the Lomonosov Ridge using bulk radiocarbon dating and probabilistic stratigraphic alignment

Francesco Muschitiello1, Matt O'Regan2, Jannik Martens3, Gabriel West2, Örjan Gustafsson3, and Martin Jakobsson2 Francesco Muschitiello et al.
  • 1Department of Geography, University of Cambridge, Cambridge CB2 3EN, UK
  • 2Department of Geological Sciences, Stockholm University, Svante Arrhenius väg 8, SE 106 91, Sweden
  • 3Department of Environmental Science and Analytical Chemistry, Stockholm University, Svante Arrhenius väg 8, SE 106 91, Sweden

Abstract. We present a new marine chronostratigraphy from a high-accumulation rate Arctic Ocean core at the intersection of the Lomonosov Ridge and the Siberian margin, spanning the last ∼30 kyr. The chronology was derived using a combination of bulk 14C dating and stratigraphic correlation to Greenland ice-core records. This was achieved by applying an appositely developed Markov chain Monte Carlo algorithm for Bayesian probabilistic alignment of proxy records. The algorithm simulates depositionally realistic alignments that are consistent with the available radiocarbon age estimates and allows deriving uncertainty bands associated with the inferred alignment. Current composite chronologies from this region are reasonably consistent with our age model during the Holocene and the latter part of deglaciation. However, prior to ∼14 kyr BP they yield too old age estimates with offsets that linearly increase up to ∼40 kyr near the onset of Marine Isotope Stage (MIS) 2. Our results challenge the robustness of previous regional chronostratigraphies and provide a new stratotype for correlation of sediment cores from this sector of the Lomonosov Ridge and East Siberian slope. In particular, they call for a re-interpretation of events in recent sea-ice proxy reconstructions (Xiao et al., 2015) inaccurately attributed to MIS-3 and the Last Glacial Maximum.

Francesco Muschitiello et al.
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Francesco Muschitiello et al.
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Short summary
In this study we present a new marine chronology of the last ∼30,000 years for a sediment core retrieved from the central Arctic Ocean. Our new chronology reveals substantially faster sedimentation rates during the end of the Last Glacial cycle, the Last Glacial Maximum, and deglaciation, than previously reported, thus implying a substantial re-interpretation of sea-ice reconstructions from this sector of the Arctic Ocean.
In this study we present a new marine chronology of the last ∼30,000 years for a sediment core...
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