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

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Abstract n = 21). Aspartic acid (Asp) and glutamic acid (Glu) racemize on average 16 ± ±  3 % faster, respectively, in C. wuellerstorfi than in N. pachyderma. The D/L values increase with sample age in nearly all cases, with a trend that follows a simple power function. Scatter around least-squares regression fits are larger for samples from the central Arctic Ocean than for those from the Nordic Seas. Calibrating the rate of racemization in C. wuellerstorfi using independently dated samples from the Greenland and Iceland seas for the past 400 ka enables estimation of sample ages from the central Arctic Ocean, where bottom water temperatures are presently relatively similar. The resulting ages are older than expected when considering the existing age models for the central Arctic Ocean cores. These results confirm that the differences are not due to taxonomic effects on AAR and further warrant a critical evaluation of existing Arctic Ocean age models. A better understanding of temperature histories at the investigated sites, and other environmental factors that may influence racemization rates in central Arctic Ocean sediments, is also needed.

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch

Erschienen in
Amino acid racemization in Neogloboquadrina pachyderma and Cibicidoides wuellerstorfi from the Arctic Ocean and its implications for age models ; volume:5 ; number:1 ; year:2023 ; pages:285-299 ; extent:15
Geochronology ; 5, Heft 1 (2023), 285-299 (gesamt 15)

Urheber
West, Gabriel
Kaufman, Darrell
Jakobsson, Martin
O'Regan, Matthew

DOI
10.5194/gchron-5-285-2023
URN
urn:nbn:de:101:1-2023062204250188119391
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
14.08.2025, 10:45 MESZ

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