Preprints
https://doi.org/10.5194/gchron-2021-9
https://doi.org/10.5194/gchron-2021-9

  07 Apr 2021

07 Apr 2021

Review status: this preprint is currently under review for the journal GChron.

Investigation of quartz ESR residual signals in the last glacial and early Holocene fluvial deposits from the Lower Rhine

Marcus Richter and Sumiko Tsukamoto Marcus Richter and Sumiko Tsukamoto
  • Leibniz Institute for Applied Geophysics (LIAG), Stilleweg 2, 30655 Hanover, Germany

Abstract. In this study, we examined the residual doses of the quartz electron spin resonance (ESR) signals from eight young fluvial sediments with known luminescence ages from the lower Rhine terraces. The single aliquot regenerative (SAR) protocol was applied to obtain the residual doses for both the Aluminium (Al) and Titanium (Ti) impurity centres. We show that all of the fluvial samples carry a significant amount of residual dose with a mean value of 1350 ± 120 Gy for the Al centre, 610 ± 60 Gy for the lithium-compensated Ti centre (Ti-Li), 170 ± 20 Gy for the hydrogen-compensated Ti centre (Ti-H), and 470 ± 50 Gy for the signal originated from both the Ti-Li and Ti-H centres (termed Ti-mix). To test the accuracy of the ESR SAR protocol, a dose recovery test was conducted and this confirmed the validity of the Ti-Li and Ti-mix signal results. The Al centre shows a dose recovery ratio of 1.74 ± 0.16, probably due to a sensitivity change by the thermal treatment in the SAR procedure, whereas the Ti-H signal shows a ratio of 0.56 ± 0.17. The results of this study suggest that fluvial sediments carry a significant residual dose, and therefore the subtraction of residual dose using a modern analogue is highly recommended to obtain reliable ESR ages.

Marcus Richter and Sumiko Tsukamoto

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gchron-2021-9', Anonymous Referee #1, 21 Apr 2021
  • RC2: 'Comment on gchron-2021-9', Mathieu Duval, 14 May 2021

Marcus Richter and Sumiko Tsukamoto

Marcus Richter and Sumiko Tsukamoto

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Short summary
When using trapped-charge dating methods to determine the time of deposition of a sediment, it is of great importance to know whether the signal containing the age information, has been completely erased before burial or if a residual signal is inherited. We examined the residual doses of the quartz ESR signals of young fluvial sediments from the lower Rhine terraces with known luminescence ages. We found varying but large residuals indicating an incomplete bleaching of the quartz ESR signals.