Reply to Lowe, D.J., Wilson, C.J.N., Newnham, R.M., Hogg, A.G. comment on Grapes, R., Rieser, U., Wang, N., 2010. Optical luminescence dating of a loess section containing a critical tephra marker horizon, SW North Island of New Zealand. Quaternary Geochronology 5, doi:10.1016/j.quageo.2009.01.004, 2010

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

doi:10.1016/j.quageo.2010.02.005

Cited by 3 publications

(1 citation statement)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This relationship of older CN 3 He‐derived emplacement ages for boulders sitting above younger OSL ages is inconsistent with stratigraphic superposition and requires either that the OSL ages are younger than the true depositional age of the loessic sediment (e.g. Almond et al ., ; Grapes et al ., ,b), that the CN ages are older than the true timing of boulder emplacement (e.g. Mackey and Quigley, ), or both.…”

Section: Discussionsupporting

confidence: 64%

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

Borella¹,

Quigley²,

Sohbati

et al. 2016

J Quaternary Science

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionsupporting

confidence: 64%

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

Borella¹,

Quigley²,

Sohbati

et al. 2016

J Quaternary Science

View full text Add to dashboard Cite

show abstract

Direct and indirect luminescence dating of tephra: A review

Bösken

Schmidt

2019

J Quaternary Science

View full text Add to dashboard Cite

In Quaternary studies, tephras are widely used as marker horizons to correlate geological deposits. Therefore, accurate and precise dating is crucial. Among radiometric dating techniques, luminescence dating has the potential to date tephra directly using glass shards, volcanic minerals that formed during the eruption or mineral fragments that originate from the shattered country rock. Moreover, sediments that frame the tephra can be dated to attain an indirect age bracket. A review of numerous luminescence dating studies highlights the method's potential and challenges. While reliable direct dating of volcanic quartz and feldspar as a component in tephra is still methodically difficult mainly due to thermal and athermal signal instability, red thermoluminescence of volcanic quartz and the far-red emission of volcanic feldspar have been used successfully. Furthermore, the dating of xenolithic quartz within tephra shows great potential. Numerous studies date tephra successfully indirectly. Dating surrounding sediments is generally straightforward as long as samples are not taken too close to the tephra horizons. Here, issues arise from the occurrence of glass shards within the sediments or unreliable determination of dose rates. This includes relocation of radioelements, mixing of tephra into the sediment and disregarding different dose rates of adjacent material.

show abstract

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

View full text Add to dashboard Cite

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.

show abstract

Cited by 3 publications

References 23 publications

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

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

Direct and indirect luminescence dating of tephra: A review

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

Contact Info

Product

Resources

About