Articles | Volume 6, issue 2
https://doi.org/10.5194/gchron-6-175-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-6-175-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 May 2024
Research article |
| 23 May 2024
| 23 May 2024
A new method for amino acid geochronology of the shell of the bivalve mollusc Arctica islandica
Martina L. G. Conti
CORRESPONDING AUTHOR
Department of Chemistry, University of York, York, YO10 5DD, United Kingdom
Paul G. Butler
Centre For Geography and Environmental Science, University of Exeter, Penryn, United Kingdom
David J. Reynolds
Centre For Geography and Environmental Science, University of Exeter, Penryn, United Kingdom
Tamara Trofimova
Centre For Geography and Environmental Science, University of Exeter, Penryn, United Kingdom
James D. Scourse
Centre For Geography and Environmental Science, University of Exeter, Penryn, United Kingdom
Kirsty E. H. Penkman
Department of Chemistry, University of York, York, YO10 5DD, United Kingdom
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Jack T. R. Wilkin, Sev Kender, Rowan Dejardin, Claire S. Allen, Victoria L. Peck, George E. A. Swann, Erin L. McClymont, James D. Scourse, Kate Littler, and Melanie J. Leng
J. Micropalaeontol., 43, 165–186, https://doi.org/10.5194/jm-43-165-2024, https://doi.org/10.5194/jm-43-165-2024, 2024
Short summary
Short summary
The sub-Antarctic island of South Georgia has a dynamic glacial history and is sensitive to climate change. Using benthic foraminifera and various geochemical proxies, we reconstruct inner–middle shelf productivity and infer glacial evolution since the late deglacial, identifying new mid–late-Holocene glacial readvances. Fursenkoina fusiformis acts as a good proxy for productivity.
Related subject area
Amino acid racemization
Amino acid racemization in Neogloboquadrina pachyderma and Cibicidoides wuellerstorfi from the Arctic Ocean and its implications for age models
Amino acid racemization in Quaternary foraminifera from the Yermak Plateau, Arctic Ocean
Gabriel West, Darrell S. Kaufman, Martin Jakobsson, and Matt O'Regan
Geochronology, 5, 285–299, https://doi.org/10.5194/gchron-5-285-2023, https://doi.org/10.5194/gchron-5-285-2023, 2023
Short summary
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.
Gabriel West, Darrell S. Kaufman, Francesco Muschitiello, Matthias Forwick, Jens Matthiessen, Jutta Wollenburg, and Matt O'Regan
Geochronology, 1, 53–67, https://doi.org/10.5194/gchron-1-53-2019, https://doi.org/10.5194/gchron-1-53-2019, 2019
Short summary
Short summary
We report amino acid racemization analyses of foraminifera from well-dated sediment cores from the Yermak Plateau, Arctic Ocean. Sample ages are compared with model predictions, revealing that the rates of racemization generally conform to a global compilation of racemization rates at deep-sea sites. These results highlight the need for further studies to test and explain the origin of the purportedly high rate of racemization indicated by previous analyses of central Arctic sediments.
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Short summary
The mollusc Arctica islandica can survive for hundreds of years, and its annual growth captures environmental conditions, each shell providing a detailed climatic record. Dating is essential for sample selection, but radiocarbon and cross-dating are laborious and costly. Alternatively, amino acid geochronology was investigated in the three aragonitic layers of the shells. This study confirms the value of AAG in the iOSL layer as a method for range-finder dating Quaternary A. islandica shells.
The mollusc Arctica islandica can survive for hundreds of years, and its annual growth captures...
