[S-CG42] Evolution and movement of the crustal surface and application of geo- and thermochronology

[SCG42-P08] A Study of IRSL Dating with the Kanazawa University Instrument

*Yuma Shibuya¹, Noriko Hasebe¹ (1.KANAZAWA UNIVERSITY)

Keywords:IRSL Dating, feldspar

Optically Stimulated Luminescence (OSL) dating is widely used to date the time elapsed since mineral grains' last exposure to the light, or age of sedimentation (Zhang. et al. 2020). Quartz, in particular, has been widely used in dating due to its simple crystal structure and stable OSL signal. However, age range by quartz OSL is restricted (e.g., Pietsch et al., 2008, Sawakuchi et al., 2018).
Therefore, feldspar dating has been attracting attention. This method is commonly referred to as IRSL dating because it uses infrared light as the excitation light. The use of feldspar has been limited in the past due to a phenomenon called fading, in which the signal that was once stored in the feldspar disappears without any action. However, a number of measurements protocols have now emerged to solve the fading problem (Huntley and Lamothe, 2001, Thomsen et al., 2008, etc.).
The luminescence reader installed in Kanazawa University starts to measure IRSL when an aliquot is moved on the heating element, which is a slightly different procedure from that of the Riso TL/OSL Reader system commonly used worldwide. In this study, we examined measurement protocols to reliably estimate accumulated dose by IRSL obtained by the domestic luminescence reader..