RESEARCH PAPER
Performance of different luminescence approaches for the dating of known-age glaciofluvial deposits from northern Switzerland
1
Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Baltzerstrasse 1+3, 3012, Bern, Switzerland
2
Department of Physical Geography and Quaternary Geology, Stockholm University, 106 91, Stockholm, Sweden
Online publication date: 2013-12-20
Publication date: 2014-03-01
Geochronometria 2014;41(1):65-80
KEYWORDS
ABSTRACT
Luminescence properties of two samples taken from sand lenses in proglacial outwash de-posits of a piedmont glacier that reached the Swiss midlands during the Last Glacial Maximum are investigated in detail. Deconvolution of CW-OSL decay curves shows that the fast component dominates the OSL signal of quartz. The chemistry of single feldspar grains, in particular the K content in different grains, is determined using wavelength dispersive spectrometry (electron microprobe), revealing an average 12.9 wt.% K of the grains contributing to the IRSL signal. D
e distributions are investigated in order to gain insights into partial bleaching, and agreement is found for quartz OSL and feldspar IR50 and pIRIR225 ages for small aliquots and single grains when applying the Minimum Age Model. These ages are also consistent with independent age control. For one sample, ages determined using the Central Age Model result in highly overestimated ages for both feldspar and quartz.
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