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Optical dating of Holocene lake sediments: elimination of the feldspar component in fine silt quartz samples

Shen, Zhixiong, Mauz, Barbara, Lang, Andreas, Bloemendal, Jan and Dearing, John (2007) Optical dating of Holocene lake sediments: elimination of the feldspar component in fine silt quartz samples Quaternary Geochronology, 2, (1-4), pp. 150-154. (doi:10.1016/j.quageo.2006.03.016).

Record type: Article

Abstract

Optically stimulated luminescence of fine silt quartz was investigated to establish chronologies for lake sediments from the British Isles. Feldspar contamination and its potential effects on equivalent dose (De) determination were examined. A new feldspar contamination test based on the thermal quenching of quartz OSL and thermal assistance of feldspar OSL identified feldspar contamination in samples being treated for 20 min in 20% hydrofluoric acid. Feldspar component monitoring based on the post-IR OSL/OSL ratio was not sufficiently sensitive to monitor a feldspar component, but is a good indicator whether a standard SAR procedure can be applied successfully, despite the presence of feldspar. Based on these results we used a modified SAR protocol including a 100 s IRSL stimulation at 50 °C before OSL readout. This protocol could overcome any malign effects of feldspar even for a feldspar bearing polymineral sub-sample.

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More information

Published date: 2007
Keywords: OSL, feldspar contamination, fine silt quartz, lake sediments

Identifiers

Local EPrints ID: 56933
URI: http://eprints.soton.ac.uk/id/eprint/56933
ISSN: 1871-1014
PURE UUID: 4f268a7f-1aee-4ab2-a315-8f6b81df9002
ORCID for John Dearing: ORCID iD orcid.org/0000-0002-1466-9640

Catalogue record

Date deposited: 11 Aug 2008
Last modified: 17 Jul 2017 14:30

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Contributors

Author: Zhixiong Shen
Author: Barbara Mauz
Author: Andreas Lang
Author: Jan Bloemendal
Author: John Dearing ORCID iD

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