Articles | Volume 5, issue 1
https://doi.org/10.5194/gchron-5-51-2023
© Author(s) 2023. 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-5-51-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
02 Feb 2023
Research article |
| 02 Feb 2023
| 02 Feb 2023
Potential impacts of chemical weathering on feldspar luminescence dating properties
Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, 1015, Switzerland
Jasquelin Peña
Department of Civil and Environmental Engineering, University of
California, Davis, One Shields Avenue, Davis, CA 95616 USA
Stéphanie Grand
Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, 1015, Switzerland
Georgina E. King
Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, 1015, Switzerland
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Dirk Mittelstraß and Sebastian Kreutzer
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Luminescence properties of samples from the Rinikerfeld, northern Switzerland, are assessed. Reader-specific low preheat temperatures are invesigated to ensure suitable measurement conditions. While quartz is found to be dominated by stable fast components, signal loss is observed for feldspar and polymineral. In general, the ages of the fading corrected feldspar and the fine-grained polymineral fractions are in agreement with coarse-grained quartz, and ages indicate sedimentation during MIS6.
Galina Faershtein, Naomi Porat, and Ari Matmon
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Optically stimulated luminescence dates the last exposure of quartz and feldspar minerals to sunlight. We investigated its sub-methods (TT-OSL, VSL, and pIRIR) to date middle and early Pleistocene sediments. Inspection of natural signals of samples can reveal saturated samples that produce only minimum ages. Using these sub-methods, minimum ages of up to the early Pleistocene can be obtained for eastern Mediterranean aeolian sediments of Nilotic origin.
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Short summary
Chemical weathering alters the chemical composition of mineral grains, and it follows that luminescence dating signals may also be progressively modified. We artificially weathered feldspar samples under different chemical conditions to understand the effect of feldspar partial dissolution on their luminescence properties. Only minor changes were observed on luminescence dating properties, implying that chemical alteration of feldspar surfaces may not affect luminescence dating signals.
Chemical weathering alters the chemical composition of mineral grains, and it follows that...
