Integrated age modelling of numerical, correlative and relative dating of a long lake sediment sequence from Orakei maar palaeolake, Auckland, New Zealand

Simple item page
dc.contributor.authorPeti, Len_AU
dc.contributor.authorAugustinus, PCen_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.date.accessioned2024-03-26T23:37:56Zen_AU
dc.date.available2024-03-26T23:37:56Zen_AU
dc.date.issued2019-04-11en_AU
dc.date.statistics2023-03-24en_AU
dc.description.abstractAccurate and precise chronologies are fundamental for successful Quaternary palaeo-climate/environment reconstruction and correlation with global climatic events. Aside from varved lake sequences, chronologies for sediment archives typically depend on age models developed from a limited number of dated horizons, often with large associated errors, age reversals, or minimum/maximum age constraints. Whilst the approach to generating chronologies for sediment cores has moved on from linear interpolation to considering age uncertainties and developing more nuanced accumulation models, these age models rarely reach the resolution and precision desired for millennial-scale palaeo-climatic correlations, particularly beyond the limits of the more precise radiocarbon method. Bayesian modelling offers the opportunity to optimise age models by combining all available information on the depositional history of the basin. Here we address this issue for the Orakei maar palaeolake sequence from Auckland, New Zealand. The Orakei maar sequence offers a high-resolution and continuous record of climatic variations spanning much of the last glacial cycle and is one of the few from the southern hemisphere mid-latitudes. The Orakei sequence spans ca. 120 to 10 ky; our chronology is derived from tephrochronology, radiocarbon dating, post-IR IRSL luminescence dating, relative palaeomagnetic intensity changes and meteoric Beryllium-10 flux. Prior to 40 ka, our age model relies on comparison with the global PISO-1500 palaeointensity stack and 10Be-flux. We generate our age model for the time interval ca. 50 to 10 ky using Bacon (rBacon in R), using non-normal error distribution of un-calibrated ages when necessary, facies-dependent variable mean accumulation rates and accounting for thick horizons of instantaneous deposition (i.e. tephra and mass movement deposits). This approach allows us to generate a high-resolution age model suitable for correlation of millennial-scale oscillations in our record, based on environmental magnetism and meteoric 10Be flux, with global records of past climate such as polar ice core, tropical lake and speleothem archives. © Author(s) 2018. CC Attribution 4.0 license.en_AU
dc.identifier.citationPeti, L., Augustinus, P. C., Fink, D., Fujioka, T., Mifsud, C., Nilsson, A., Muscheler, R., Fitzsimmons, K. E., & Hopkins, J. L. (2019). Integrated age modelling of numerical, correlative and relative dating of a long lake sediment sequence from Orakei maar palaeolake, Auckland, New Zealand. Paper presented to the EGU General Assembly 2019, Vienna, Austria, 7-12 April 2019. In Geophysical Research Abstracts, Vol. 21, EGU2019-274. Retrieved from: https://meetingorganizer.copernicus.org/EGU2019/EGU2019-274.pdfen_AU
dc.identifier.conferenceenddate2019-04-12en_AU
dc.identifier.conferencenameEGU General Assembly 2019en_AU
dc.identifier.conferenceplaceVienna, Austria.en_AU
dc.identifier.conferencestartdate2019-04-07en_AU
dc.identifier.otherEGU2019-274en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2019/EGU2019-274.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15538en_AU
dc.identifier.volume21en_AU
dc.language.isoenen_AU
dc.publisherCopernicus GmbHen_AU
dc.relation.urihttps://meetingorganizer.copernicus.org/EGU2019/EGU2019-274.pdfen_AU
dc.subjectSimulationen_AU
dc.subjectCavesen_AU
dc.subjectLakesen_AU
dc.subjectNew Zealanden_AU
dc.subjectClimatesen_AU
dc.subjectEnvironmenten_AU
dc.subjectSedimentsen_AU
dc.subjectGlaciersen_AU
dc.subjectCarbon 14en_AU
dc.subjectBeryllium 10en_AU
dc.titleIntegrated age modelling of numerical, correlative and relative dating of a long lake sediment sequence from Orakei maar palaeolake, Auckland, New Zealanden_AU
dc.typeConference Abstracten_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Conference Publications