Regional 10Be production rate calibration for the past 12 ka deduced from the radiocarbon-dated Grøtlandsura and Russenes rock avalanches at 69° N, Norway

Fenton, C.R., Hermanns, R.L., Blikra, L.H., Kubik, P.W., Bryant, C.L., Niedermann, S., Meixner, A. and Goethals, M.M. (2011) Regional 10Be production rate calibration for the past 12 ka deduced from the radiocarbon-dated Grøtlandsura and Russenes rock avalanches at 69° N, Norway. Quaternary Geochronology, 6(5), pp. 437-452. (doi: 10.1016/j.quageo.2011.04.005)

Full text not currently available from Enlighten.

Abstract

Two rock avalanches in Troms County – the Grøtlandsura and Russenes – were selected as CRONUS-EU natural cosmogenic <sup>10</sup>Be production-rate calibration sites because they (a) preserve large boulders that have been continuously exposed to cosmic irradiation since their emplacement; (b) contain boulders with abundant quartz phenocrysts and veins with low concentrations of naturally-occurring <sup>9</sup>Be (typically < 1.5 ppb); and (c) have reliable minimum radiocarbon ages of 11,424 ± 108 cal yr BP and 10,942 ± 77 cal yr BP (1σ), respectively. Quartz samples (n = 6) from these two sites contained between 4.28 × 10<sup>4</sup> and 5.06 × 10<sup>4</sup> at <sup>10</sup>Be/g using the 1.387 Myr <sup>10</sup>Be half-life. Determination of these concentrations accounts for topographic and self-shielding, and effects on nuclide production due to isostatic rebound are shown to be negligible. Persistent, constant snow and moss cover cannot be proven, but if taken into consideration they may have reduced <sup>10</sup>Be concentrations by 10%. Using the <sup>10</sup>Be half-life of 1.387 Myr and the Stone scaling scheme, and accounting for snow- and moss-cover, we calculate an error-weighted mean total <sup>10</sup>Be production rate of 4.12 ± 0.19 at/g/yr (1σ). A corresponding error-weighted mean spallogenic <sup>10</sup>Be production rate is 3.96 ± 0.16 at/g/yr (1σ), respectively. These are in agreement within uncertainty with other <sup>10</sup>Be production rates in the literature, but are significantly, statistically lower than the global average <sup>10</sup>Be production rate. This research indicates, like other recent studies, that the production of cosmogenic <sup>10</sup>Be in quartz is lower than previously established by other production-rate calibration projects. Similarly, our findings indicate that regional cosmogenic production rates should be used for determining exposure ages of landforms in order to increase the accuracy of those ages. As such, using the total <sup>10</sup>Be production rate from our study, we determine an error-weighted mean surface-exposure age of a third rock avalanche in Troms County (the Hølen avalanche) to be 7.5 ± 0.3 kyr (1σ). This age suggests that the rock avalanche occurred shortly after the 8.2 kyr cooling event, just as the radiocarbon ages of the Grøtlandsura and Russenes avalanches confirm field evidence that those rock-slope failures occurred shortly after deglaciation.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bryant, Dr Charlotte
Authors: Fenton, C.R., Hermanns, R.L., Blikra, L.H., Kubik, P.W., Bryant, C.L., Niedermann, S., Meixner, A., and Goethals, M.M.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Quaternary Geochronology
ISSN:1871-1014

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
356231CRONUS- EUFinlay StuartEuropean Commission (EC)MRTN-CT-2004-51SUERC