Optical luminescence dating of a loess section containing a critical tephra marker horizon, SW North Island of New Zealand

Grapes, Rodney; Rieser, U.; Ning-sheng, Wang

doi:10.1016/j.quageo.2009.01.004

Cited by 11 publications

(19 citation statements)

References 30 publications

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“…26-28 ka (95% probability) for the KOT derived from the calibration of four optimum radiocarbon ( 14 C) ages which are consistent with, and supported by, independent tephrostratigraphic and palaeoenvironmental data (e.g., Lowe et al, 2008a). We do not agree that there is an "unresolved discrepancy between the two dating systems" as concluded by Grapes et al (2010) -available data suggest that the luminescence age is much more likely to be erroneous than the 14 C age. In our criticisms we firstly comment on the presentation and analysis of the luminescence ages.…”

Section: Introductioncontrasting

confidence: 39%

“…19 ka for the KOT. Secondly, we suggest some possible reasons (additional to those of Grapes et al, 2010) as to why the IRSL ages for the KOT, and possibly loess samples more generally, could be underestimated. Thirdly, we outline tephrostratigraphic and palaeoenvironmental considerations relating to the age of the KOT and show that an age of ca.…”

Section: Introductionmentioning

confidence: 79%

“…Unfortunately, the IRSL age of ca. 17.0 ± 2.2 ka obtained on the KOT by Grapes et al (2010) is, in our view, flawed and hence misleading for several reasons, given below. Instead, we favour a significantly older age of ca.…”

Section: Introductionmentioning

confidence: 90%

“…We therefore respect the efforts of Grapes et al (2010) to re-date the Kawakawa tephra (also known as Oruanui tephra and hereafter referred to as Kawakawa/Oruanui tephra or KOT) in a sequence of loess in New Zealand using infraredstimulated luminescence (IRSL). Unfortunately, the IRSL age of ca.…”

Section: Introductionmentioning

confidence: 99%

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Dating the Kawakawa/Oruanui eruption: Comment on “Optical luminescence dating of a loess section containing a critical tephra marker horizon, SW North Island of New Zealand” by R. Grapes et al.

Lowe

Wilson

Newnham

et al. 2010

Quaternary Geochronology

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An IRSL age of 17.0 ± 2.2 ka (and a "mean age" of ca. 19 ka) reported by Grapes et al.[Grapes, R., Rieser, U., Wang, N. Optical luminescence dating of a loess section containing a critical tephra marker horizon, SW North Island of New Zealand. Quaternary Geochronology 5(2-3), 164-169.] for the Kawakawa/Oruanui tephra, and other ages associated with a loess section in New Zealand, are untenable: age data presented are inconsistent, no formal statistical treatments or error determinations were undertaken in age analysis, and the ages proposed are seriously at odds with multiple radiocarbon age determinations on tephra sequences bracketing the Kawakawa/Oruanui tephra and with palaeoenvironmental evidence elsewhere for the time period concerned. We suggest that the bulk polymineral IRSL ages on the tephra and encapsulating loess deposits were underestimated in part because of contamination of the loess by the integration of younger materials during slow deposition and continuous modification by upbuilding pedogenesis. Single-grain luminescence assays may reveal such contamination. A 14 C-based age of ca. 27 ± 1 ka cal BP (2), reported in 2008, currently remains the best estimate for the age of eruption of the Kawakawa/Oruanui tephra.

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Section: Introductioncontrasting

confidence: 39%

Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Dating the Kawakawa/Oruanui eruption: Comment on “Optical luminescence dating of a loess section containing a critical tephra marker horizon, SW North Island of New Zealand” by R. Grapes et al.

Lowe

Wilson

Newnham

et al. 2010

Quaternary Geochronology

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“…Growing suspicion about whether the adopted age of KOT is accurate has arisen from (i) detailed radiocarbon chronologies from LGM lake sediments (e.g. Newnham et al, 2007a;Vandergoes et al, in this issue), and (ii) OSL ages of KOT in loess Grapes et al, 2010aGrapes et al, , 2010b. Here we present results from recent sampling and dating of carbonised wood within the ignimbrite, intact and in situ plant remains overwhelmed by distal tephra-fall deposits, and organic material from undisturbed lake sediment enclosing the tephra layer.…”

Section: Introductionmentioning

confidence: 99%

A revised age for the Kawakawa/Oruanui tephra, a key marker for the Last Glacial Maximum in New Zealand

Vandergoes

Hogg

Lowe

et al. 2013

Quaternary Science Reviews

186

160

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a b s t r a c tThe Kawakawa/Oruanui tephra (KOT) is a key chronostratigraphic marker in terrestrial and marine deposits of the New Zealand (NZ) sector of the southwest Pacific. Erupted early during the Last Glacial Maximum (LGM), the wide distribution of the KOT enables inter-regional alignment of proxy records and facilitates comparison between NZ climatic variations and those from well-dated records elsewhere. We present 22 new radiocarbon ages for the KOT from sites and materials considered optimal for dating, and apply Bayesian statistical methods via OxCal4.1.7 that incorporate stratigraphic information to develop a new age probability model for KOT. The revised calibrated age, AE2 standard deviations, for the eruption of the KOT is 25,360 AE 160 cal yr BP. The age revision provides a basis for refining marine reservoir ages for the LGM in the southwest Pacific.Published by Elsevier Ltd.

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Chronology and processes of late Quaternary hillslope sedimentation in the eastern South Island, New Zealand

Borella¹,

Quigley²,

Sohbati

et al. 2016

J Quaternary Science

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Optical and radiocarbon dating of loessic hillslope sediments in New Zealand's South Island is used to constrain the timing of prehistoric rockfalls and associated seismic events, quantify spatial and temporal patterns of landscape evolution, and examine hillslope responses to climatic and anthropogenic forcing. Exploratory trenches adjacent to prehistoric boulders enable stratigraphic analysis of loess and loesscolluvium pre-and post-boulder emplacement sediments. Luminescence ages from colluvial sediments constrain timing of boulder emplacement to between ~3.0 and ~12.5 ka, well before the arrival of Polynesians (c. AD 1280) and Europeans (c. AD 1800) in New Zealand. Three phases of colluviation are revealed at the Rapaki study site, reflecting natural and anthropogenic-driven shifts in sedimentation and landscape evolution. Sediment accumulation rates increased considerably (>15 factor increase) following human arrival and associated anthropogenic burning of hillslope vegetation. Phytolith results suggest paleo-vegetation at Rapaki was compositionally variable and persisted under a predominantly cool temperature environment with warm-temperate elements. Palm phytolith abundances imply maximum climate warming during early (~12-11 ka) and late (~3-2 ka) Holocene phases. This study provides insights into the spatial and temporal patterns of hillslope evolution, highlighting the roles of climate change, earthquakes, and humans on surface processes.Keywords: rockfall, paleoseismicity, hillslope response, OSL, radiocarbon 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 patterns of hillslope evolution, highlighting the roles of climate change, earthquakes, and humans on surface processes.

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Optical luminescence dating of a loess section containing a critical tephra marker horizon, SW North Island of New Zealand

Cited by 11 publications

References 30 publications

Dating the Kawakawa/Oruanui eruption: Comment on “Optical luminescence dating of a loess section containing a critical tephra marker horizon, SW North Island of New Zealand” by R. Grapes et al.

Dating the Kawakawa/Oruanui eruption: Comment on “Optical luminescence dating of a loess section containing a critical tephra marker horizon, SW North Island of New Zealand” by R. Grapes et al.

A revised age for the Kawakawa/Oruanui tephra, a key marker for the Last Glacial Maximum in New Zealand

Chronology and processes of late Quaternary hillslope sedimentation in the eastern South Island, New Zealand

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