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Comparing different post-IR IRSL approaches for the dating of Holocene coastal foredunes from Ruhnu Island, Estonia
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
2014 (English)In: Geochronometria, ISSN 1733-8387, E-ISSN 1897-1695, Vol. 41, no 4, 342-351 p.Article in journal (Refereed) Published
Abstract [en]

Different post-IR Infrared Stimulated Luminescence (IRSL) approaches are applied to sediments from a Holocene coastal foredune sequence on Ruhnu Island in the eastern Baltic Sea. The comparison of D (e)-values and ages determined by the different approaches is complimented by fading and bleaching experiments. The fading experiments imply strong fading of IRSL (50A degrees C) signals and no fading of any of the post-IR IRSL signals, but this is not confirmed by the determined D (e)-values. In fact, post-IR IRSL (150A degrees C) D (e)-values agree within errors with those calculated for IRSL (50A degrees C). From the bleaching experiments it is inferred that the higher values observed for post-IR IRSL at more elevated stimulation temperatures (225A degrees C/290A degrees C) are likely related to either thermal transfer and/or slow-to-bleach components within the signal. For the dating of the Holocene foredune sequence of Ruhnu Island, the post-IR IRSL (150A degrees C) approach is preferred and these agree with the limited independent age control available from radiocarbon dating. Accordingly, the sequence formed between ca. 7.0 ka and 2.5 ka ago.

Place, publisher, year, edition, pages
2014. Vol. 41, no 4, 342-351 p.
Keyword [en]
luminescence, post-IR IRSL, foredunes, Holocene, Baltic Sea
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-109258DOI: 10.2478/s13386-013-0169-7ISI: 000343054100005OAI: oai:DiVA.org:su-109258DiVA: diva2:765573
Note

AuthorCount:3;

Available from: 2014-11-24 Created: 2014-11-17 Last updated: 2017-12-05Bibliographically approved

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