Radiocarbon-calibrated amino acid racemization ages from Holocene sand dollars (Peronella peronii)

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dc.contributor.authorKosnik, MAen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorKaufman, DSen_AU
dc.contributor.authorKowalewski, Men_AU
dc.contributor.authorWhitacre, KEen_AU
dc.date.accessioned2021-07-30T02:06:04Zen_AU
dc.date.available2021-07-30T02:06:04Zen_AU
dc.date.issued2017-04en_AU
dc.date.statistics2021-07-19en_AU
dc.description.abstractAmino acid racemization (AAR) is widely used as a cost-effective method to date molluscs in time-averaging and taphonomic studies, but it has not been attempted for echinoderms despite their paleobiological importance and distinct biomineralization. Here we demonstrate the applicability of AAR geochronology for dating Holocene Peronella peronii (Echinodermata: Echinoidea) collected from Sydney Harbour (Australia). Using standard HPLC methods we determined the extent of AAR in 74 Peronella tests and performed replicate analyses on 23 tests. Replicate analyses from the outer edge of 23 tests spanning the observed range of D/L values yielded median coefficients of variation <4% for Asp, Glu, and Phe D/L values, which is comparable to the analytical precision. Correlations between THAA D/L values across 178 independently prepared subsamples of 74 individuals are also very high (Spearman ρ ≥ 0.95) for these three amino acids. The ages of 20 individuals spanning the observed range of D/L values were determined using 14C analyses, and Bayesian model averaging was used to determine the best AAR age model. Only three models fit to Glu D/L contributed to the final averaged age model. Modeled ages ranged from 14 to 5496 years, and the median 95% confidence interval for the 54 AAR ages was ±29% of the modelled age. In comparison, the median 2σ confidence interval for nine graphite target 14C ages was ±8% of the median age estimate and the median 2σ confidence interval for 20 carbonate target 14C ages was ±26% of the median age estimate. Overall Peronella yield high-quality D/L values and appear to be a good target for AAR geochronology. ©2016 Elsevier B.Ven_AU
dc.identifier.citationKosnik, M. A., Hua, Q., Kaufman, D. S., Kowalewski, M., & Whitacre, K. (2017). Radiocarbon-calibrated amino acid racemization ages from Holocene sand dollars (Peronella peronii). Quaternary Geochronology, 39, 174-188. doi:10.1016/j.quageo.2016.12.001en_AU
dc.identifier.issn1871-1014en_AU
dc.identifier.journaltitleQuaternary Geochronologyen_AU
dc.identifier.pagination174-188en_AU
dc.identifier.urihttps://doi.org/10.1016/j.quageo.2016.12.001en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/11164en_AU
dc.identifier.volume39en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCarbon 14en_AU
dc.subjectCalibrationen_AU
dc.subjectAmino acidsen_AU
dc.subjectRacemizationen_AU
dc.subjectQuaternary perioden_AU
dc.subjectSanden_AU
dc.subjectMolluscsen_AU
dc.subjectEchinodermsen_AU
dc.subjectAge estimationen_AU
dc.titleRadiocarbon-calibrated amino acid racemization ages from Holocene sand dollars (Peronella peronii)en_AU
dc.typeJournal Articleen_AU
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