Test of AMS 14C dating of pollen concentrates using tephrochronology

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dc.contributor.authorNewnham, Rewi M.
dc.contributor.authorVandergoes, Marcus J.
dc.contributor.authorGarnett, Mark H.
dc.contributor.authorLowe, David J.
dc.contributor.authorPrior, Christine
dc.contributor.authorAlmond, Peter C.
dc.date.accessioned2008-08-07T01:48:36Z
dc.date.available2008-08-07T01:48:36Z
dc.date.issued2007-01
dc.description.abstractPrevious attempts to radiocarbon date sediments >10 kyr from the high rainfall region of Westland, New Zealand, a critical location for investigation of interhemispheric patterns of climate change, have been problematic. This study, building on recent work by Vandergoes and Prior (2003), shows that AMS 14C dating of pollen concentrates has potential to provide more reliable ages than other sediment constituents, including plant macrofossils. The method was applied to sediments from three sites containing the 22.6k 14C yr Kawakawa Tephra, which provided an independent test of the 14C ages. Although some minor laboratory contamination was detected in tests on background standards, the modelled relationship between sample mass and measured 14C content permitted an appropriate correction to be determined. Improved pollen concentrations derived by density separation between 1.4 and 1.2 specific gravity and sieving in the range 10-50 m provided either older ages than other fractions of the same sample or, where in situ contamination was not evident, equivalent ages. Differences in degree of in situ contamination between depositional environments indicated that, in Westland, lake sites may be less susceptible to contamination by younger carbon than peat sites, where this process may be facilitated by root penetration into underlying sediments.en_US
dc.identifier.citationNewnham, R.M., Vandergoes, M.J., Garnett, M.H., Lowe, D.J., Prior, C., Almond, P.CJ. (2007). Test of AMS 14C dating of pollen concentrates using tephrochronology. Journal of Quaternary Science 22(1), 37-51.en_US
dc.identifier.doi10.1002/jqs.1016en_US
dc.identifier.issn1099-1417
dc.identifier.urihttps://hdl.handle.net/10289/926
dc.language.isoen
dc.publisherJohn Wiley & Sonsen_NZ
dc.relation.isPartOfJournal of Quaternary Scienceen_NZ
dc.subjectAMS radiocarbon datingen_US
dc.subjectpollen concentratesen_US
dc.subjectKawakawa Tephraen_US
dc.subjectcontaminationen_US
dc.subjectWestland, New Zealanden_US
dc.titleTest of AMS 14C dating of pollen concentrates using tephrochronologyen_US
dc.typeJournal Articleen_US
pubs.begin-page37en_NZ
pubs.elements-id32125
pubs.end-page51en_NZ
pubs.issue1en_NZ
pubs.volume22en_NZ
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