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), 150-154. (doi:10.1016/j.quageo.2006.03.016).
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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.
|Keywords:||OSL, feldspar contamination, fine silt quartz, lake sediments|
|Subjects:||G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
G Geography. Anthropology. Recreation > GB Physical geography
|Divisions:||University Structure - Pre August 2011 > School of Geography > Environmental Processes and Change
|Date Deposited:||11 Aug 2008|
|Last Modified:||01 Jun 2011 00:30|
|Contact Email Address:||J.Dearing@soton.ac.uk|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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