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Comparison of Equivalent Doses Obtained with Various post-IR IRSL Dating Protocols of K-Feldspar

Comparison of Equivalent Doses Obtained with Various post-IR IRSL Dating Protocols of K-Feldspar AbstractFive dating protocols with post-infrared infrared (IR) stimulated luminescence signals (i.e. pIRIR) were performed on the K-feldspar of loess samples. Two of them were the single-aliquot regenerative-dose protocol (SAR) with two-step pIRIR stimulation, with the first IR stimulation at 50°C or 200°C and the second at 290°C (pIR50IR290, pIR200IR290). Two of them were the SAR protocols with five-step or six-step IR stimulation at multiple elevated temperatures to 250°C or 300°C (MET-pIRIR250, MET-pIRIR300). The final one was the multiple-aliquot regenerative-dose (MAR) protocol with the MET-pIRIR300 signal, together with a 500°C heat treatment administered before the test dose (‘MAR with heat’). The results show that when the equivalent dose (De) of the sample was less than 500 Gy, all of the protocols gave consistent results; however, when De exceeded 750 Gy, all of the SAR protocols underestimated De. The pIR50IR290 signal had the highest degree of underestimation, while the pIR200IR290, MET-pIRIR250 and MET-pIRIR300 signals had similar De values and similar degrees of underestimation. Possible reasons for the SAR De underestimation are discussed. We suggest that only the ‘MAR with heat’ protocol is suitable for samples with De exceeding 750 Gy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geochronometria de Gruyter

Comparison of Equivalent Doses Obtained with Various post-IR IRSL Dating Protocols of K-Feldspar

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Publisher
de Gruyter
Copyright
© 2019 Junjie Zhang et al., published by Sciendo
ISSN
1897-1695
eISSN
1897-1695
DOI
10.2478/geochr-2020-0010
Publisher site
See Article on Publisher Site

Abstract

AbstractFive dating protocols with post-infrared infrared (IR) stimulated luminescence signals (i.e. pIRIR) were performed on the K-feldspar of loess samples. Two of them were the single-aliquot regenerative-dose protocol (SAR) with two-step pIRIR stimulation, with the first IR stimulation at 50°C or 200°C and the second at 290°C (pIR50IR290, pIR200IR290). Two of them were the SAR protocols with five-step or six-step IR stimulation at multiple elevated temperatures to 250°C or 300°C (MET-pIRIR250, MET-pIRIR300). The final one was the multiple-aliquot regenerative-dose (MAR) protocol with the MET-pIRIR300 signal, together with a 500°C heat treatment administered before the test dose (‘MAR with heat’). The results show that when the equivalent dose (De) of the sample was less than 500 Gy, all of the protocols gave consistent results; however, when De exceeded 750 Gy, all of the SAR protocols underestimated De. The pIR50IR290 signal had the highest degree of underestimation, while the pIR200IR290, MET-pIRIR250 and MET-pIRIR300 signals had similar De values and similar degrees of underestimation. Possible reasons for the SAR De underestimation are discussed. We suggest that only the ‘MAR with heat’ protocol is suitable for samples with De exceeding 750 Gy.

Journal

Geochronometria – de Gruyter

Published: Jan 1, 2021

Keywords: Chinese loess; Potassium feldspar; pIRIR protocols; age underestimations

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