<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Thermoluminescence (TL) dating is a valuable tool for chronometric dating of heated minerals and has been shown to agree very well with independent age control. Comparison with argon dating of samples from identical events, however, revealed age underestimations of volcanic eruptions dated by orange-red TL (R-TL) of quartz extracts from some xenolith samples, while good agreement was obtained for others. The underestimation is attributed to an apparent signal loss (“anomalous fading”) which was experimentally observed for some, but not all samples investigated. The presence of significant amounts of feldspar or tridymite, which could be related to the observations, is excluded by IRSL (Infrared Stimulated Luminescence) and XRD analysis. While the data is not entirely conclusive, it leads to the current working hypothesis that exposure to high temperatures might be responsible for an effect similar to the anomalous fading phenomena observed for some feldspar luminescence. It therefore appears to be prudent not to sample xenoliths from high temperature context, like basalt dykes in volcanic context.</p></abstract>

Thermoluminescence (TL) dating is a valuable tool for chronometric dating of heated minerals and has been shown to agree very well with independent age control. Comparison with argon dating of samples from identical events, however, revealed age underestimations of volcanic eruptions dated by orange-red TL (R-TL) of quartz extracts from some xenolith samples, while good agreement was obtained for others. The underestimation is attributed to an apparent signal loss (“anomalous fading”) which was experimentally observed for some, but not all samples investigated. The presence of significant amounts of feldspar or tridymite, which could be related to the observations, is excluded by IRSL (Infrared Stimulated Luminescence) and XRD analysis. While the data is not entirely conclusive, it leads to the current working hypothesis that exposure to high temperatures might be responsible for an effect similar to the anomalous fading phenomena observed for some feldspar luminescence. It therefore appears to be prudent not to sample xenoliths from high temperature context, like basalt dykes in volcanic context.

Palaeodose Underestimation Of Heated Quartz In Red-TL Dating Of Volcanic Contexts

Chair of Geomorphology, Institute for Geography, University of Bayreuth, Germany

Department of Human Evolution, Max-Planck-Institute for Evolutionary Anthropology, Leipzig, Germany

Institute of Ecology, Subject Area Landscape Change, Leuphana University Lüneburg, Germany

Geochronometria

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Thermoluminescence (TL) dating is a valuable tool for chronometric dating of heated minerals and has been shown to agree very well with independent age...

Palaeodose Underestimation Of Heated Quartz In Red-TL Dating Of Volcanic Contexts

Publié en ligne: 07 nov. 2015

Pages: -

Reçu: 13 avr. 2015

Accepté: 24 sept. 2015

DOI: https://doi.org/10.1515/geochr-2015-0020

Mots clés
thermoluminescence dating, red TL, volcanism, xenolith, quartz, fading

© 2015 Daniel Richter et al., published by De Gruyter Open

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Palaeodose Underestimation Of Heated Quartz In Red-TL Dating Of Volcanic Contexts

Publié en ligne: 07 nov. 2015

Pages: -

Reçu: 13 avr. 2015

Accepté: 24 sept. 2015

DOI: https://doi.org/10.1515/geochr-2015-0020

Mots clésthermoluminescence dating, red TL, volcanism, xenolith, quartz, fading

© 2015 Daniel Richter et al., published by De Gruyter Open

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Mots clés
thermoluminescence dating, red TL, volcanism, xenolith, quartz, fading