Journal
QUATERNARY GEOCHRONOLOGY
Volume 30, Issue -, Pages 233-238Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.quageo.2015.02.015
Keywords
Optically stimulated luminescence; Post-IR infrared stimulated luminescence; Incomplete bleaching; Fluvial sediments
Funding
- Aberystwyth University
- Natural Environment Research Council (NERC) [NE/G524301/1]
- Geological Society of South Africa (GSSA) Research, Education and Investment Fund
- Quaternary Research Association (QRA) New Research Workers' Award
- Department of Geography and Earth Sciences at Aberystwyth University
- NERC [NE/G524301/1] Funding Source: UKRI
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A comparative study using quartz optically stimulated luminescence (OSL) and feldspar post-infrared infrared stimulated luminescence (post-IR IRSL) was undertaken on Quaternary fluvial sediments from an unnamed tributary of the Moopetsi River in South Africa. The aim is to assess whether the post-IR IRSL signal can be used to date incompletely bleached sediments. Several post-IR IRSL signals using varying stimulation and preheat temperatures were investigated; of these the post-IR IRSL225 signal was deemed most appropriate for dating because it bleached most rapidly. The feldspar post-IR IRSL225 equivalent dose (D-e) values from this site are consistently larger than those from quartz OSL, probably due to differences in the bleaching characteristics of the two signals. Additionally, the post-IR IRSL225 D-e values within a sample showed less variation in precision than the quartz D-e data, possibly due to greater averaging between grains in the feldspar small aliquots. The agreement between ages based on the OSL and post-IR IRSL225 signals was better for younger samples (<20 ka) than for older ones (>50 ka); the cause of this variation is unclear. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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