Thrasher, I. M., Mauz, B., Chiverrell, R. C., Lang, A. and Thomas, G. S. P. 2009. Testing an approach to OSL dating of Late Devensian glaciofluvial sediments of the British Isles. J. Quaternary Sci., Vol. 24 pp. 785–801. ISSN 0267-8179.
Testing an approach to OSL dating of Late Devensian glaciofluvial sediments of the British Isles†
Article first published online: 25 FEB 2009
Copyright © 2009 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Volume 24, Issue 7, pages 785–801, October 2009
How to Cite
Thrasher, I. M., Mauz, B., Chiverrell, R. C., Lang, A. and Thomas, G. S. P. (2009), Testing an approach to OSL dating of Late Devensian glaciofluvial sediments of the British Isles. J. Quaternary Sci., 24: 785–801. doi: 10.1002/jqs.1253
- Issue published online: 12 OCT 2009
- Article first published online: 25 FEB 2009
- Manuscript Accepted: 3 DEC 2008
- Manuscript Revised: 24 NOV 2008
- Manuscript Received: 6 JUN 2008
- University of Liverpool
- Quaternary Research Association
- optically stimulated luminescence;
- glaciofluvial lithofacies;
- heterogeneous bleaching;
- statistical ‘age’ models
In the British and Irish Isles, the understanding of expansion and retreat of the last ice sheet in Marine Isotope Stage (MIS) 2 has been hindered by a lack of chronological control for the timing of its maximum extent and subsequent retreat stages. In this research, a suite of lithofacies from a former distal ice marginal sandur at Orrisdale, Isle of Man, were identified and selected for optically stimulated luminescence dating. Different-size fractions of quartz grains were extracted from selected lithofacies types with the aim of identifying which depositional environments and grain size fractions are best suited for optical dating. Tests have been undertaken to identify the luminescence properties of this quartz, including preheat dose recovery and constant-wave optically stimulated luminescence (OSL) decay curve fitting. Equivalent dose distributions for all samples were wide and positively skewed, indicative of heterogeneous bleaching. A comprehensive statistically based decision-making protocol has been defined in order to find the appropriate statistical model for burial dose estimation. Ages in the range of 17–14 ka have been obtained which agree with the expected geologically constrained chronology. The Orrisdale Formation is contemporaneous with Heinrich Event 1 and the Killard Point Stadial identified in eastern Ireland ca. 16.4 ka. The suggested approach for OSL dating of glaciofluvial sediments has the potential for much wider application to high latitude or temperate areas where there is an abundance of such sediments and where improved chronological control is much needed. Copyright © 2009 John Wiley & Sons, Ltd.