Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand

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dc.contributor.author Peti, Leonie
dc.contributor.author Fitzsimmons, Kathryn
dc.contributor.author Hopkins, Jenni
dc.contributor.author Nilsson, Andreas
dc.contributor.author Fujioka, Toshiyuki
dc.contributor.author Fink, David
dc.contributor.author Mifsud, Charles
dc.contributor.author Christl, Marcus
dc.contributor.author Muscheler, Raimund
dc.contributor.author Augustinus, Paul
dc.date.accessioned 2021-04-13T23:22:17Z
dc.date.available 2021-04-13T23:22:17Z
dc.date.issued 2020-12-15
dc.identifier.citation Geochronology 2(2):367-410 15 Dec 2020
dc.identifier.uri https://hdl.handle.net/2292/54875
dc.description.abstract Northern 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 ∼1mkyr−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 (PISO1500). The maar-forming phreatomagmatic eruption of the Orakei maar is now dated to >132305 years (95% confidence range: 131430 to 133180 years). Our new chronol ogy facilitates high-resolution palaeo-environmental reconstruction for northern New Zealand spanning the last ca. 130000 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 isofparamountimportanceinthecontextofidentificationof leadsandlagsindifferentcomponentsoftheSouthernHemisphere climate system as well as identification of Northern Hemisphere climate signals.
dc.relation.ispartofseries Geochronology
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher.
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.title Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand
dc.type Journal Article
dc.identifier.doi 10.5194/geochron-2-367-2020
pubs.begin-page 367
pubs.volume 2
dc.date.updated 2021-03-07T20:30:46Z
dc.rights.holder Copyright: The authors en
pubs.author-url https://doi.org/10.5194/geochron-2-367-2020
pubs.end-page 410
dc.rights.accessrights http://purl.org/eprint/accessRights/OpenAccess en
pubs.subtype Article
pubs.elements-id 842680
pubs.online-publication-date 2020-12-15


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