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| Titel |
Potential and limits of OSL, TT-OSL, IRSL and pIRIR290 dating methods applied on a Middle Pleistocene sediment record of Lake El'gygytgyn, Russia |
| VerfasserIn |
A. Zander, A. Hilgers |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 2 ; Nr. 9, no. 2 (2013-03-14), S.719-733 |
| Datensatznummer |
250018016
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| Publikation (Nr.) |
 copernicus.org/cp-9-719-2013.pdf |
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| Zusammenfassung |
| This study tests the paleomagnetic and proxy-data based Mid- to
Upper Pleistocene sediment deposition history of Lake El'gygytgyn by applying
different approaches of luminescence dating techniques on sediment cores
taken from the centre of the 175 m deep lake. For dating polymineral and
quartz fine grains (4–11 μm grain size range) were extracted from
nine different levels from the upper 28 m of sediment cores 5011-1A and
5011-1B. According to the independent age model, the lowest sample from
27.8–27.9 m below lake bottom level correlates to the Brunhes-Matuyama
(B/M) reversal. Polymineral sub-samples were analysed by infra-red stimulated
luminescence (IRSL) and post-IR IRSL measured at 290 °C
(pIRIR290) using single aliquot regenerative dose (SAR) sequences. SAR
protocols were further applied to measure the blue light optically stimulated
luminescence (OSL) and thermally-transferred OSL (TT-OSL) of fine-grained
quartz supplemented by a multiple aliquot approach. Neither low temperature
IRSL measurements at 50 °C nor any OSL dating approach on quartz
yielded reliable results. Deconvolution of their dose response curves
revealed a pseudo-increase of the dose response curves and explains the
observed underestimation. The pIRIR protocol applied to polymineral fine
grains was the only luminescence technique able to provide dating results of
acceptable accuracy up to ca. 700 ka when correlated to the existing
proxy-data and paleomagnetic based age record. We present the potential and
limits of the different dating techniques and a correlation of
pIRIR290 results with the proxy-data based age model. |
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