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. Luminescence dating has become a pillar of the understanding ofPleistocene glacial advances in the northern foreland of the Swiss Alps.However, both quartz and feldspar from the region are equally challenging asdosimeters with anomalous fading and partial bleaching being some of theobstacles to overcome for the establishment of decisive chronologies. Inthis study, luminescence properties of coarse- and fine-grained quartz,feldspar, and polymineral fractions of eight samples from a palaeovalley,Rinikerfeld in northern Switzerland, are systematically assessed. Standardperformance tests are conducted on all four fractions. Deconvolution ofluminescence signals of the quartz fractions is implemented and shows thedominance of stable fast components. Reader-specific low preheattemperatures are investigated on the infrared stimulated luminescence (IRSL)signal of feldspar. Thermal stability of this signal is found for lowpreheats, and thermal quenching could be excluded for higher preheats.However, anomalous fading is observed in the feldspar and polymineral IRSLsignals and two correction approaches are applied. For one approach, fadingcorrected coarse-grained feldspar ages are consistent with those derivedfrom quartz. In general, coarse-grained quartz and feldspar, as well as thefine-grained polymineral fraction of one sample, are in chrono-stratigraphicagreement and present negligible evidence for partial bleaching. However,ages derived from fine-grained quartz are found to underestimate those ofthe coarse-grained quartz fractions. Hence, the impact of alpha efficiencyand water content on the dose rate and thus the ages are assessed. Afinite explanation for the observed discrepancies remains lacking, but thissystematic investigation of different luminescence signals allows for theestablishment of a chronology for the palaeovalley fill dating back to atleast Marine Isotope Stage 6 (MIS 6).

Luminescence properties and dating of glacial to periglacial sediments from northern Switzerland