Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand
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Published:2020-12-15
Issue:2
Volume:2
Page:367-410
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ISSN:2628-3719
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Container-title:Geochronology
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language:en
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Short-container-title:Geochronology
Author:
Peti LeonieORCID, Fitzsimmons Kathryn E.ORCID, Hopkins Jenni L., Nilsson Andreas, Fujioka ToshiyukiORCID, Fink David, Mifsud Charles, Christl MarcusORCID, Muscheler RaimundORCID, Augustinus Paul C.
Abstract
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
∼ 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.
Funder
Marsden Fund Australian Institute of Nuclear Science and Engineering Vetenskapsrådet
Publisher
Copernicus GmbH
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