Issues in radiocarbon and U-series dating of corals from the last glacial period

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dc.contributor.authorEsat, TMen_AU
dc.contributor.authorYokoyama, Yen_AU
dc.date.accessioned2009-06-17T06:17:22Zen_AU
dc.date.accessioned2010-04-30T05:01:49Zen_AU
dc.date.available2009-06-17T06:17:22Zen_AU
dc.date.available2010-04-30T05:01:49Zen_AU
dc.date.issued2008-08en_AU
dc.date.statistics2008-08en_AU
dc.description.abstractRadiocarbon calibration beyond the extent of tree-ring records depends on U-series dating of fossil corals or speleothem, both of which can provide independent calendar ages. Less direct methods rely on layer counting and comparison with other well-dated records. In spite of considerable effort to provide a reliable radiocarbon calibration curve beyond 25,000 years, the majority of the data show large atmospheric radiocarbon peaks which are inconsistent both in magnitude and timing between different determinations. The results of the most recent work [Chiu, T.-C., Fairbanks, R.G., Mortlock, R.A., Bloom, A.L., 2005. Extending the radiocarbon calibration beyond 26,000 years before present using fossil corals. Quaternary Science Reviews 24 (16-17), 1797-1808], from Araki Island fossil corals, indicate a monotonic variation from about 33 to 49 ka, with no radiocarbon peaks, but with some gaps in the data. The difference between this and previous results, from fossil corals, has been attributed to selection of better-quality samples and rigorous analytical methods. However, previous results from Huon Peninsula [Yokoyama, Y., Esat, T.M., Lambeck, K., Fifield, L.K., 2000. Last ice age millennial scale climate changes recorded in Huon Peninsula corals. Radiocarbon 42 (3), 383-401; Cutler, K.B., Gray, S.C., Burr, G.S., Edwards, R.L., Taylor, F.W., Cabioch, G., Beck, J.W., Cheng, H., Moore, J., 2004. Radiocarbon calibration and comparison to 50 kyr BP with paired C-14 and Th-230 dating of corals from Vanuatu and Papua New Guinea. Radiocarbon 46 (3), 1127-1160] show radiocarbon peaks exclusively located within the gaps in the Araki data. The timing of the gaps are not random, but appear to be related to severe climate and sea-level variations associated with Heinrich events initiated in the North Atlantic. We propose that the Huon and Araki data sets are complementary rather than exclusive and that the absence of coral growth at Araki Island during Heinrich events presumably reflect local adverse conditions for coral growth. © 2007, Elsevier Ltd.en_AU
dc.identifier.citationEsat, T. M., & Yokoyama, Y. (2008). Issues in radiocarbon and U-series dating of corals from the last glacial period. Quaternary Geochronology, 3(3), 244-252. doi:10.1016/j.quageo.2007.11.004en_AU
dc.identifier.govdoc1107en_AU
dc.identifier.issn1871-1014en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleQuaternary Geochronologyen_AU
dc.identifier.pagination244-252en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.quageo.2007.11.004en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1409en_AU
dc.identifier.volume3en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCoralsen_AU
dc.subjectIsotope datingen_AU
dc.subjectAge estimationen_AU
dc.subjectFossilsen_AU
dc.subjectPapua New Guineaen_AU
dc.subjectClimatic changeen_AU
dc.titleIssues in radiocarbon and U-series dating of corals from the last glacial perioden_AU
dc.typeJournal Articleen_AU
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