Multi-method age model of a long lake sediment sequence from Orakei maar palaeolake, Auckland, New Zealand

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dc.contributor.authorPeti, Len_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorFujioka, Ten_AU
dc.contributor.authorMifsud, Cen_AU
dc.contributor.authorNilsson, Aen_AU
dc.contributor.authorMuscheler, Ren_AU
dc.contributor.authorFitzsimmons, KEen_AU
dc.contributor.authorHopkins, JLen_AU
dc.contributor.authorAugustinus, PCen_AU
dc.date.accessioned2023-06-30T04:42:36Zen_AU
dc.date.available2023-06-30T04:42:36Zen_AU
dc.date.issued2019-07-30en_AU
dc.date.statistics2023-04-12en_AU
dc.description.abstractMeaningful reconstructions of Quaternary palaeo-climate and -environmental reconstruction rely heavily on accurate and precise chronologies. Long and continuous lake sediment sequences are outstanding archives of past climatic change but, unless varved, depend on the development of detailed age models. Such models estimate the age-depth-relationship of the sequence from a limited number of dated horizons, which often carry large associated errors, age reversals, or minimum/maximum age constraints. Approaches to chronology development for sediment sequences have seen major improvements such as more nuanced Bayesian accumulation models but still rarely reach the resolution and precision desired for the study objectives in the context of high-resolution palaeo-climatic correlations of global events. This is particularly true beyond the limits of the well-established and more precise radiocarbon dating method. Sediment archives older than 50 ka have often not been used to its full potential for the lack of chronology estimates. In such cases, alternative methods including correlative and relative dating methods may need to be employed. Currently, a standardised method of integrating absolute dating with wiggle-matched curves of comparable proxies between the unknown and a dated sequence is lacking. Here we address this problem in the context of the Orakei maar palaeolake sequence from Auckland, New Zealand. This sediment record is a high-quality example of one of the rare high-resolution and continuous lacustrine archives of climatic variations in the southern hemisphere mid-latitudes over much of the last glacial cycle. Based on previous estimates, the Orakei sequence spans the interval ca. 126 cal ka BP to 9 cal ka BP. The presented Orakei chronology is based on absolute ages from tephrochronology, radiocarbon dating and post-IR IRSL luminescence dating. Prior to 40 ka, tuning of relative palaeomagnetic intensity changes and meteoric Beryllium-10 flux to the global PISO-1500 palaeointensity stack between absolute age markers allows to establish a novel accumulation model for the Orakei sequence. This approach allows us to generate a high-resolution age model suitable for correlation of millennial-scale oscillations from the SW Pacific to global records of past climate such as polar ice core, tropical lake and speleothem archives. © The Authors.en_AU
dc.identifier.citationPeti. L., Fink, D., Fujioka, T., Mifsud, C., Nilsson, A., Muscheler, R., Fitzsimmons, K. E., Hopkins, J. L., & Augustinus, P. C. (2019). Multi-method age model of a long lake sediment sequence from Orakei maar palaeolake, Auckland, New Zealand. Paper presented to the 20th INQUA Congress, Dublin, Ireland, 25th - 31st July 2019. Retrieved from: https://virtual.oxfordabstracts.com/#/event/public/574/submission/1562en_AU
dc.identifier.conferenceenddate31 July 2019en_AU
dc.identifier.conferencename20th INQUA Congressen_AU
dc.identifier.conferenceplaceDublin, Irelanden_AU
dc.identifier.conferencestartdate25 July 2019en_AU
dc.identifier.urihttps://virtual.oxfordabstracts.com/#/event/public/574/submission/1562en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15078en_AU
dc.language.isoenen_AU
dc.publisherInternational Union for Quaternary Research (INQUA)en_AU
dc.subjectLakesen_AU
dc.subjectSedimentsen_AU
dc.subjectNew Zealanden_AU
dc.subjectEnvironmenten_AU
dc.subjectClimatesen_AU
dc.subjectSouthern Hemisphereen_AU
dc.subjectAge estimationen_AU
dc.subjectLuminescenceen_AU
dc.titleMulti-method age model of a long lake sediment sequence from Orakei maar palaeolake, Auckland, New Zealanden_AU
dc.typeConference Abstracten_AU
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