Articles | Volume 5, issue 1
https://doi.org/10.5194/gchron-5-285-2023
https://doi.org/10.5194/gchron-5-285-2023
Research article
 | 
19 Jun 2023
Research article |  | 19 Jun 2023

Amino acid racemization in Neogloboquadrina pachyderma and Cibicidoides wuellerstorfi from the Arctic Ocean and its implications for age models

Gabriel West, Darrell S. Kaufman, Martin Jakobsson, and Matt O'Regan

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Cited articles

Alexanderson, H., Backman, J., Cronin, T. M., Funder, S., Ingólfsson, Ó., Jakobsson, M., Landvik, J. Y., Löwemark, L., Mangerud, J., März, C., Möller, P., O'Regan, M., and Spielhagen, R. F.: An Arctic perspective on dating Mid-Late Pleistocene environmental history, Quaternary Sci. Rev., 92, 9–31, https://doi.org/10.1016/j.quascirev.2013.09.023, 2014. 
Anthonissen, D. E. and Ogg, J. G.: Cenozoic and Cretaceous Biochronology of Planktonic Foraminifera and Calcareous Nannofossils, in: The Geologic Time Scale, edited by: Gradstein, F. M., Ogg, J. G., Schmitz, M., and Ogg, G., Elsevier, 1083–1127, https://doi.org/10.1016/B978-0-444-59425-9.15003-6, 2012. 
Backman, J., Jakobsson, M., Lvlie, R., Polyak, L., and Febo, L. A.: Is the central Arctic Ocean a sediment starved basin?, Quaternary Sci. Rev., 20, 1435–1454, https://doi.org/10.1016/j.quascirev.2003.12.005, 2004. 
Backman, J., Jakobsson, M., Frank, M., Sangiorgi, F., Brinkhuis, H., Stickley, C., O'Regan, M., Løvlie, R., Pälike, H., Spofforth, D., Gattacecca, J., Moran, K., King, J., and Heil, C.: Age model and core-seismic integration for the Cenozoic Arctic Coring Expedition sediments from the Lomonosov Ridge, Paleoceanography, 23, PA1S01, https://doi.org/10.1029/2007PA001476, 2008. 
Bauch, H. A.: Sedimentation rate of sediment core PS1906-2, PANGAEA, https://doi.org/10.1594/PANGAEA.82396, 2002. 
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Short summary
We report aspartic and glutamic acid racemization analyses on Neogloboquadrina pachyderma and Cibicidoides wuellerstorfi from the Arctic Ocean (AO). The rates of racemization in the species are compared. Calibrating the rate of racemization in C. wuellerstorfi for the past 400 ka allows the estimation of sample ages from the central AO. Estimated ages are older than existing age assignments (as previously observed for N. pachyderma), confirming that differences are not due to taxonomic effects.