<abstract xmlns="http://www.w3.org/1999/xhtml">

Five dating protocols with post-infrared infrared (IR) stimulated luminescence signals (<italic>i.e.</italic> 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 (<italic>D</italic>e) of the sample was less than 500 Gy, all of the protocols gave consistent results; however, when <italic>D</italic>e exceeded 750 Gy, all of the SAR protocols underestimated <italic>De</italic>. The pIR50IR290 signal had the highest degree of underestimation, while the pIR200IR290, MET-pIRIR250 and MET-pIRIR300 signals had similar <italic>De</italic> values and similar degrees of underestimation. Possible reasons for the SAR <italic>D</italic>e underestimation are discussed. We suggest that only the ‘MAR with heat’ protocol is suitable for samples with <italic>D</italic>e exceeding 750 Gy.
</abstract>

Five 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.

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

State Key Laboratory of Loess and Quaternary Geology

Institute of Earth Environment, Chinese Academy of Sciences

Key Laboratory of Cenozoic Geology and Environment

Institute of Geology and Geophysics, Chinese Academy of Sciences

University of Chinese Academy of Sciences

State Key Laboratory of Isotope Geochemistry

Guangzhou Institute of Geochemistry, Chinese Academy of Sciences

Geochronometria

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Five dating protocols with post-infrared infrared (IR) stimulated luminescence signals (i.e. pIRIR) were performed on the K-feldspar of loess samples. Two of...

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

Published Online: Dec 31, 2021

Page range: 129 - 137

Received: Jan 15, 2019

Accepted: Oct 29, 2019

DOI: https://doi.org/10.2478/geochr-2020-0010

Keywords
Chinese loess, Potassium feldspar, pIRIR protocols, age underestimations

© 2019 Junjie Zhang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

Published Online: Dec 31, 2021

Page range: 129 - 137

Received: Jan 15, 2019

Accepted: Oct 29, 2019

DOI: https://doi.org/10.2478/geochr-2020-0010

KeywordsChinese loess, Potassium feldspar, pIRIR protocols, age underestimations

© 2019 Junjie Zhang et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Chinese loess, Potassium feldspar, pIRIR protocols, age underestimations