Development of a multi-method chronology spanning the last glacial interval from Orakei maar lake, Auckland, New Zealand

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dc.contributor.authorPeti, Len_AU
dc.contributor.authorFitzsimmons, KEen_AU
dc.contributor.authorHopkins, JLen_AU
dc.contributor.authorNilsson, Aen_AU
dc.contributor.authorFujioka, Ten_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorMifsud, Cen_AU
dc.contributor.authorChristl, Men_AU
dc.contributor.authorMuscheler, Ren_AU
dc.contributor.authorAugustinus, PCen_AU
dc.date.accessioned2021-12-20T22:12:45Zen_AU
dc.date.available2021-12-20T22:12:45Zen_AU
dc.date.issued2020-12-15en_AU
dc.date.statistics2021-11-22en_AU
dc.description.abstractNorthern New Zealand is an important location for understanding Last Glacial Interval (LGI) palaeoclimate dynamics, since it is influenced by both tropical and polar climate systems which have varied in relative strength and timing. Sediments from the Auckland Volcanic Field maar lakes preserve records of such large-scale climatic influences on regional palaeo-environment changes, as well as past volcanic eruptions. The sediment sequence infilling Orakei maar lake is continuous, laminated, and rapidly deposited, and it provides a high-resolution (sedimentation rate above ∼ 1 m kyr−1) archive from which to investigate the dynamic nature of the northern New Zealand climate system over the LGI. Here we present the chronological framework for the Orakei maar sediment sequence. Our chronology was developed using Bayesian age modelling of combined radiocarbon ages, tephrochronology of known-age rhyolitic tephra marker layers, 40Ar∕39Ar-dated eruption age of a local basaltic volcano, luminescence dating (using post-infrared–infrared stimulated luminescence, or pIR-IRSL), and the timing of the Laschamp palaeomagnetic excursion. We have integrated our absolute chronology with tuning of the relative palaeo-intensity record of the Earth's magnetic field to a global reference curve (PISO-1500). The maar-forming phreatomagmatic eruption of the Orakei maar is now dated to > 132 305 years (95 % confidence range: 131 430 to 133 180 years). Our new chronology facilitates high-resolution palaeo-environmental reconstruction for northern New Zealand spanning the last ca. 130 000 years for the first time as most NZ records that span all or parts of the LGI are fragmentary, low-resolution, and poorly dated. Providing this chronological framework for LGI climate events inferred from the Orakei sequence is of paramount importance in the context of identification of leads and lags in different components of the Southern Hemisphere climate system as well as identification of Northern Hemisphere climate signals. © Author(s) 2020 This work is distributed under the Creative Commons Attribution 4.0 Licence.en_AU
dc.identifier.citationPeti, L., Fitzsimmons, K. E., Hopkins, J. L., Nilsson, A., Fujioka, T., Fink, D., Mifsud, C., Christl, M., Muscheler, R., & Augustinus, P. C. (2020). Development of a multi-method chronology spanning the last glacial interval from Orakei maar lake, Auckland, New Zealand. Geochronology, 2(2), 367–410, doi:10.5194/gchron-2-367-2020en_AU
dc.identifier.issn2628-3719en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleGeochronologyen_AU
dc.identifier.pagination367-410en_AU
dc.identifier.urihttps://doi.org/10.5194/gchron-2-367-2020en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12593en_AU
dc.identifier.volume2en_AU
dc.language.isoenen_AU
dc.publisherEuropean Geosciences Unionen_AU
dc.subjectNew Zealanden_AU
dc.subjectPaleoclimatologyen_AU
dc.subjectClimatic changeen_AU
dc.subjectSedimentsen_AU
dc.subjectAge estimationen_AU
dc.subjectSouthern Hemisphereen_AU
dc.titleDevelopment of a multi-method chronology spanning the last glacial interval from Orakei maar lake, Auckland, New Zealanden_AU
dc.typeJournal Articleen_AU
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