Articles | Volume 6, issue 1
https://doi.org/10.5194/gchron-6-77-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-6-77-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Short communication/technical note
| 
05 Mar 2024
Short communication/technical note |
| 05 Mar 2024
| 05 Mar 2024
Short communication: Synchrotron-based elemental mapping of single grains to investigate variable infrared-radiofluorescence emissions for luminescence dating
Mariana Sontag-González
CORRESPONDING AUTHOR
Department of Geosciences, Stony Brook University, 255 Earth and Space Sciences Building, Stony Brook, NY 11794-2100, USA
Department of Geography, Justus Liebig University Giessen, 35390 Giessen, Germany
Raju Kumar
CORRESPONDING AUTHOR
Research Laboratory for Archaeology and the History of Art, University of Oxford, Dyson Perrins Building, South Parks Road, Oxford, OX1 3QY, UK
Jean-Luc Schwenninger
Research Laboratory for Archaeology and the History of Art, University of Oxford, Dyson Perrins Building, South Parks Road, Oxford, OX1 3QY, UK
Juergen Thieme
Department of Geosciences, Stony Brook University, 255 Earth and Space Sciences Building, Stony Brook, NY 11794-2100, USA
Institute for X-Ray Physics, Georg August University of Goettingen, 37077 Goettingen, Germany
Sebastian Kreutzer
Institute of Geography, Ruprecht Karl University of Heidelberg, 69120 Heidelberg, Germany
Marine Frouin
Department of Geosciences, Stony Brook University, 255 Earth and Space Sciences Building, Stony Brook, NY 11794-2100, USA
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Annette Kadereit, Mariana Sontag-González, Sebastian Kreutzer, Marco Colombo, Christoph Schmidt, and Paul R. Hanson
EGUsphere, https://doi.org/10.5194/egusphere-2025-5978, https://doi.org/10.5194/egusphere-2025-5978, 2025
This preprint is open for discussion and under review for Geochronology (GChron).
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Infrared-stimulated luminescence (IRSL) dating of feldspar is an essential tool for dating sediments. Two major challenges of the IRSL signal are its “anomalous” instability potentially leading to age underestimation and its slow bleaching by sunlight which may cause age overestimation. Here we propose a progressively elevated temperature (PET) IRSL single aliquot regenerative (SAR) procedure to isolate a potentially stable IRSL signal from a set of best bleached subsamples.
Mariana Sontag-González, Madhav K. Murari, Mayank Jain, Marine Frouin, and Markus Fuchs
Geochronology, 7, 289–308, https://doi.org/10.5194/gchron-7-289-2025, https://doi.org/10.5194/gchron-7-289-2025, 2025
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We tested the reliability of infrared radiofluorescence (IR-RF) dating of K-feldspar on samples of known age. We compare several measurement protocols and analysis variants and determine the most appropriate version. Additionally, we compare these results with those obtained using infrared photoluminescence (IRPL), an alternative dating method for K-feldspar, for the same samples. Our results confirm the dating potential of IR-RF and highlight similarities and differences to other methods.
Svenja Riedesel, Guillaume Guérin, Kristina J. Thomsen, Mariana Sontag-González, Matthias Blessing, Greg A. Botha, Max Hellers, Gunther Möller, Andreas Peffeköver, Christian Sommer, Anja Zander, and Manuel Will
Geochronology, 7, 59–81, https://doi.org/10.5194/gchron-7-59-2025, https://doi.org/10.5194/gchron-7-59-2025, 2025
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We apply luminescence dating of feldspars to establish a geochronological framework for the sequence of accretionary hillslope deposition at Jojosi, which contains important archaeological artefacts. We test and evaluate four different dose models and their applicability to single-grain and multi-grain data sets containing up to 67 % saturated grains. Our results constrain erosional and depositional processes from 100–700 ka and human occupation of the area in early MIS 5 and late MIS 6.
Annette Kadereit, Mariana Sontag-González, Sebastian Kreutzer, Marco Colombo, Christoph Schmidt, and Paul R. Hanson
EGUsphere, https://doi.org/10.5194/egusphere-2025-5978, https://doi.org/10.5194/egusphere-2025-5978, 2025
This preprint is open for discussion and under review for Geochronology (GChron).
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Infrared-stimulated luminescence (IRSL) dating of feldspar is an essential tool for dating sediments. Two major challenges of the IRSL signal are its “anomalous” instability potentially leading to age underestimation and its slow bleaching by sunlight which may cause age overestimation. Here we propose a progressively elevated temperature (PET) IRSL single aliquot regenerative (SAR) procedure to isolate a potentially stable IRSL signal from a set of best bleached subsamples.
Mariana Sontag-González, Madhav K. Murari, Mayank Jain, Marine Frouin, and Markus Fuchs
Geochronology, 7, 289–308, https://doi.org/10.5194/gchron-7-289-2025, https://doi.org/10.5194/gchron-7-289-2025, 2025
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We tested the reliability of infrared radiofluorescence (IR-RF) dating of K-feldspar on samples of known age. We compare several measurement protocols and analysis variants and determine the most appropriate version. Additionally, we compare these results with those obtained using infrared photoluminescence (IRPL), an alternative dating method for K-feldspar, for the same samples. Our results confirm the dating potential of IR-RF and highlight similarities and differences to other methods.
Sebastian Kreutzer, Loïc Martin, Didier Miallier, and Norbert Mercier
Geochronology, 7, 229–246, https://doi.org/10.5194/gchron-7-229-2025, https://doi.org/10.5194/gchron-7-229-2025, 2025
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Accurate readings on the environmental gamma dose rate are important. Portable gamma-ray detectors, such as those that are NaI- or LaBr3-based, are easy to handle and affordable. Limited information on alternatives, like CZT (cadmium zinc telluride) detectors, is available. We tested CZT detectors and found them suitable for in-field deployment. We used simulations and field tests to evaluate the optimal energy threshold for direct dose rate readings, making the CZT system a reliable alternative.
Svenja Riedesel, Guillaume Guérin, Kristina J. Thomsen, Mariana Sontag-González, Matthias Blessing, Greg A. Botha, Max Hellers, Gunther Möller, Andreas Peffeköver, Christian Sommer, Anja Zander, and Manuel Will
Geochronology, 7, 59–81, https://doi.org/10.5194/gchron-7-59-2025, https://doi.org/10.5194/gchron-7-59-2025, 2025
Short summary
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We apply luminescence dating of feldspars to establish a geochronological framework for the sequence of accretionary hillslope deposition at Jojosi, which contains important archaeological artefacts. We test and evaluate four different dose models and their applicability to single-grain and multi-grain data sets containing up to 67 % saturated grains. Our results constrain erosional and depositional processes from 100–700 ka and human occupation of the area in early MIS 5 and late MIS 6.
Christoph Schmidt, Théo Halter, Paul R. Hanson, Alexey Ulianov, Benita Putlitz, Georgina E. King, and Sebastian Kreutzer
Geochronology, 6, 665–682, https://doi.org/10.5194/gchron-6-665-2024, https://doi.org/10.5194/gchron-6-665-2024, 2024
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We study the use of zircons as dosimeters using modern techniques, highlighting their advantages such as time-invariant dose rates. We explore the correlation between zircon geochemistry and luminescence properties, observe fast zircon optically stimulated luminescence (OSL) bleaching rates, and assess the potential of auto-regeneration. Low OSL sensitivities require combining natural OSL and auto-regenerated thermoluminescence (TL), with the potential to enhance age accuracy and precision.
Nora Pfaffner, Annette Kadereit, Volker Karius, Thomas Kolb, Sebastian Kreutzer, and Daniela Sauer
E&G Quaternary Sci. J., 73, 1–22, https://doi.org/10.5194/egqsj-73-1-2024, https://doi.org/10.5194/egqsj-73-1-2024, 2024
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We present results of the Baix loess–palaeosol sequence, SE France. Reconstructed intense soil formation under warm, moist conditions before and into the last ice age and less intense soil formations in warm (temporarily moist) phases during the generally cold, dry ice age were validated with laboratory and dating techniques. This is particularly relevant as Baix is located in the temperate–Mediterranean climate transition zone, a sensitive zone that is susceptible to future climate changes.
Marine Frouin, Taylor Grandfield, William Huebsch, and Owen Evans
Geochronology, 5, 405–412, https://doi.org/10.5194/gchron-5-405-2023, https://doi.org/10.5194/gchron-5-405-2023, 2023
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Here, we present the lighting setting implemented in the new Luminescence Dating Research Laboratory at Stony Brook University, USA. First, we performed spectral measurements on different light sources and filters. Then, we measured the loss of dose in quartz and feldspar samples when exposed to various light sources and durations. Finally, we conclude that our lighting setting is suitable for a luminescence darkroom laboratory; it is simple, inexpensive to build, and durable.
Mathieu Bosq, Sebastian Kreutzer, Pascal Bertran, Philippe Lanos, Philippe Dufresne, and Christoph Schmidt
Earth Syst. Sci. Data, 15, 4689–4711, https://doi.org/10.5194/essd-15-4689-2023, https://doi.org/10.5194/essd-15-4689-2023, 2023
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During the last glacial period, cold conditions associated with changes in atmospheric circulation resulted in the deposition of widespread loess. It seems that the phases of loess accumulation were not strictly synchronous. To test this hypothesis, the chronology of loess deposition in different regions of Europe was studied by recalculating 1423 luminescence ages in a database. Our study discusses the link between the main loess sedimentation phases and the maximal advance of glaciers.
Sebastian Kreutzer, Steve Grehl, Michael Höhne, Oliver Simmank, Kay Dornich, Grzegorz Adamiec, Christoph Burow, Helen M. Roberts, and Geoff A. T. Duller
Geochronology, 5, 271–284, https://doi.org/10.5194/gchron-5-271-2023, https://doi.org/10.5194/gchron-5-271-2023, 2023
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The concept of open data has become the modern science meme. Funding bodies and publishers support open data. However, the open data mandate frequently encounters technical obstacles, such as a lack of a suitable data format for data sharing and long-term data preservation. Such issues are often community-specific and demand community-tailored solutions. We propose a new human-readable data format for data exchange and long-term preservation of luminescence data called XLUM.
Michael Dietze, Sebastian Kreutzer, Margret C. Fuchs, and Sascha Meszner
Geochronology, 4, 323–338, https://doi.org/10.5194/gchron-4-323-2022, https://doi.org/10.5194/gchron-4-323-2022, 2022
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The R package sandbox is a collection of functions that allow the creation, sampling and analysis of fully virtual sediment sections, like having a virtual twin of real-world deposits. This article introduces the concept, features, and workflows required to use sandbox. It shows how a real-world sediment section can be mapped into the model and subsequently addresses a series of theoretical and practical questions, exploiting the flexibility of the model framework.
Norbert Mercier, Jean-Michel Galharret, Chantal Tribolo, Sebastian Kreutzer, and Anne Philippe
Geochronology, 4, 297–310, https://doi.org/10.5194/gchron-4-297-2022, https://doi.org/10.5194/gchron-4-297-2022, 2022
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Dosimetric dating methods based on the analysis of luminescence signals emitted by granular minerals extracted from sedimentary deposits now play an important role in the study of the Quaternary. Here we propose a new approach in which the age of the deposit is calculated by combining the equivalent dose and dose-rate distributions. The underlying Bayesian mathematical model and its implementation via an R code are provided, together with the results obtained for a finite set of configurations.
Barbara Mauz, Loïc Martin, Michael Discher, Chantal Tribolo, Sebastian Kreutzer, Chiara Bahl, Andreas Lang, and Nobert Mercier
Geochronology, 3, 371–381, https://doi.org/10.5194/gchron-3-371-2021, https://doi.org/10.5194/gchron-3-371-2021, 2021
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Luminescence dating requires irradiating the sample in the laboratory. Here, we address some concerns about the reliability of the calibration procedure that have been published recently. We found that the interplay between geometrical parameters such as grain size and aliquot size impacts the calibration value more than previously thought. The results of our study are robust and allow us to recommend an improved calibration procedure in order to enhance the reliability of the calibration value.
Dirk Mittelstraß and Sebastian Kreutzer
Geochronology, 3, 299–319, https://doi.org/10.5194/gchron-3-299-2021, https://doi.org/10.5194/gchron-3-299-2021, 2021
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Our contribution enhances the infrared radiofluorescence dating technique, used to determine the last sunlight exposure of potassium feldspars in a range of about 600 to 600 000 years backwards. We recorded radiofluorescence images of fine sands and processed them with tailored open-source software to obtain ages from single grains. Finally, we tested our new method successfully on two natural sediment samples. Studies in Earth science will benefit from improved age accuracy and new insights.
Guillaume Guérin, Christelle Lahaye, Maryam Heydari, Martin Autzen, Jan-Pieter Buylaert, Pierre Guibert, Mayank Jain, Sebastian Kreutzer, Brice Lebrun, Andrew S. Murray, Kristina J. Thomsen, Petra Urbanova, and Anne Philippe
Geochronology, 3, 229–245, https://doi.org/10.5194/gchron-3-229-2021, https://doi.org/10.5194/gchron-3-229-2021, 2021
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This paper demonstrates how to model optically stimulated luminescence (OSL) and radiocarbon ages in a Bayesian framework, using a dedicated software tool called BayLum. We show the effect of stratigraphic constraints, of modelling the covariance of ages when the same equipment is used for a series of OSL samples, and of including independent ages on a chronological inference. The improvement in chronological resolution is significant.
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Short summary
This is a preliminary study using a synchrotron light source to generate elemental maps, incorporating oxidation states, with a spatial resolution of <1 µm for individual grains within the K-feldspar density fraction. The elemental fingerprint characterizing grains with a signal suitable for infrared radiofluorescence dating reveals high levels of K, Pb, and Ba coupled with low levels of Fe and Ca. In contrast, grains exhibiting higher proportions of Fe and Ca produce an odd signal shape.
This is a preliminary study using a synchrotron light source to generate elemental maps,...
