Comparative numerical surface exposure-age dating (10Be and Schmidt hammer) of an early-Holocene rock avalanche at Alstadfjellet, Valldalen, southern Norway

Peter Wilson; Henriette Linge; John A. Matthews; Richard W. Mourne; Jesper Olsen

doi:10.1080/04353676.2019.1644815

Comparative numerical surface exposure-age dating (¹⁰Be and Schmidt hammer) of an early-Holocene rock avalanche at Alstadfjellet, Valldalen, southern Norway

Peter Wilson^*
, Henriette Linge
, John A. Matthews
, Richard W. Mourne
, Jesper Olsen

^*Corresponding author for this work

Department of Physics and Astronomy

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

18 Citations (Scopus)

Abstract

Application of calibrated Schmidt-hammer surface-exposure dating (SHD) to the run-out debris of a rock avalanche at Alstadfjellet, Valldalen, southern Norway, has yielded ages that are consistent within uncertainties with terrestrial cosmogenic ¹⁰Be surface-exposure ages for the debris. SHD calibration was based on young and old control sites that were, respectively, recent road cuts / rockfall boulders of known age, and Younger Dryas moraines for which ¹⁰Be ages had been obtained. Three SHD calibration equations were generated based on different correction factors for the ¹⁰Be ages from the moraines. The SHD ages (10.3 ± 0.59–11.1 ± 0.64 ka) for the run-out debris are from 1.1 ka to 1.3 ka older than the corresponding ¹⁰Be ages (9.2 ± 0.7–9.8 ± 0.7 ka). In addition, the former ages have a precision of 1.18–1.28 ka (95% confidence intervals) as opposed to 2.8 ka (2σ range) for the latter ages. This work demonstrates that calibrated SHD can be of comparable accuracy to and may have improved precision over ¹⁰Be ages, and should be given greater consideration and prominence in Quaternary dating studies.

Original language	English
Journal	Geografiska Annaler, Series A: Physical Geography
Volume	101
Issue	4
Pages (from-to)	293-309
Number of pages	17
ISSN	0435-3676
DOIs	https://doi.org/10.1080/04353676.2019.1644815
Publication status	Published - 2019

Keywords

Be terrestrial cosmogenic nuclide dating
Holocene
rock avalanche
Schmidt-hammer dating
southern Norway

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Cite this

@article{c82b694a6eeb4051b2d8f330ceb713fb,

title = "Comparative numerical surface exposure-age dating (10Be and Schmidt hammer) of an early-Holocene rock avalanche at Alstadfjellet, Valldalen, southern Norway",

abstract = "Application of calibrated Schmidt-hammer surface-exposure dating (SHD) to the run-out debris of a rock avalanche at Alstadfjellet, Valldalen, southern Norway, has yielded ages that are consistent within uncertainties with terrestrial cosmogenic 10Be surface-exposure ages for the debris. SHD calibration was based on young and old control sites that were, respectively, recent road cuts / rockfall boulders of known age, and Younger Dryas moraines for which 10Be ages had been obtained. Three SHD calibration equations were generated based on different correction factors for the 10Be ages from the moraines. The SHD ages (10.3 ± 0.59–11.1 ± 0.64 ka) for the run-out debris are from 1.1 ka to 1.3 ka older than the corresponding 10Be ages (9.2 ± 0.7–9.8 ± 0.7 ka). In addition, the former ages have a precision of 1.18–1.28 ka (95\% confidence intervals) as opposed to 2.8 ka (2σ range) for the latter ages. This work demonstrates that calibrated SHD can be of comparable accuracy to and may have improved precision over 10Be ages, and should be given greater consideration and prominence in Quaternary dating studies.",

keywords = "Be terrestrial cosmogenic nuclide dating, Holocene, rock avalanche, Schmidt-hammer dating, southern Norway",

author = "Peter Wilson and Henriette Linge and Matthews, \{John A.\} and Mourne, \{Richard W.\} and Jesper Olsen",

year = "2019",

doi = "10.1080/04353676.2019.1644815",

language = "English",

volume = "101",

pages = "293--309",

journal = "Geografiska Annaler, Series A: Physical Geography",

issn = "0435-3676",

publisher = "Taylor and Francis Ltd.",

number = "4",

}

Comparative numerical surface exposure-age dating (¹⁰Be and Schmidt hammer) of an early-Holocene rock avalanche at Alstadfjellet, Valldalen, southern Norway. / Wilson, Peter; Linge, Henriette; Matthews, John A. et al.
In: Geografiska Annaler, Series A: Physical Geography, Vol. 101, No. 4, 2019, p. 293-309.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Comparative numerical surface exposure-age dating (10Be and Schmidt hammer) of an early-Holocene rock avalanche at Alstadfjellet, Valldalen, southern Norway

AU - Wilson, Peter

AU - Linge, Henriette

AU - Matthews, John A.

AU - Mourne, Richard W.

AU - Olsen, Jesper

PY - 2019

Y1 - 2019

N2 - Application of calibrated Schmidt-hammer surface-exposure dating (SHD) to the run-out debris of a rock avalanche at Alstadfjellet, Valldalen, southern Norway, has yielded ages that are consistent within uncertainties with terrestrial cosmogenic 10Be surface-exposure ages for the debris. SHD calibration was based on young and old control sites that were, respectively, recent road cuts / rockfall boulders of known age, and Younger Dryas moraines for which 10Be ages had been obtained. Three SHD calibration equations were generated based on different correction factors for the 10Be ages from the moraines. The SHD ages (10.3 ± 0.59–11.1 ± 0.64 ka) for the run-out debris are from 1.1 ka to 1.3 ka older than the corresponding 10Be ages (9.2 ± 0.7–9.8 ± 0.7 ka). In addition, the former ages have a precision of 1.18–1.28 ka (95% confidence intervals) as opposed to 2.8 ka (2σ range) for the latter ages. This work demonstrates that calibrated SHD can be of comparable accuracy to and may have improved precision over 10Be ages, and should be given greater consideration and prominence in Quaternary dating studies.

AB - Application of calibrated Schmidt-hammer surface-exposure dating (SHD) to the run-out debris of a rock avalanche at Alstadfjellet, Valldalen, southern Norway, has yielded ages that are consistent within uncertainties with terrestrial cosmogenic 10Be surface-exposure ages for the debris. SHD calibration was based on young and old control sites that were, respectively, recent road cuts / rockfall boulders of known age, and Younger Dryas moraines for which 10Be ages had been obtained. Three SHD calibration equations were generated based on different correction factors for the 10Be ages from the moraines. The SHD ages (10.3 ± 0.59–11.1 ± 0.64 ka) for the run-out debris are from 1.1 ka to 1.3 ka older than the corresponding 10Be ages (9.2 ± 0.7–9.8 ± 0.7 ka). In addition, the former ages have a precision of 1.18–1.28 ka (95% confidence intervals) as opposed to 2.8 ka (2σ range) for the latter ages. This work demonstrates that calibrated SHD can be of comparable accuracy to and may have improved precision over 10Be ages, and should be given greater consideration and prominence in Quaternary dating studies.

KW - Be terrestrial cosmogenic nuclide dating

KW - Holocene

KW - rock avalanche

KW - Schmidt-hammer dating

KW - southern Norway

UR - https://www.scopus.com/pages/publications/85070969410

U2 - 10.1080/04353676.2019.1644815

DO - 10.1080/04353676.2019.1644815

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EP - 309

JO - Geografiska Annaler, Series A: Physical Geography

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