Abstract
Compared to quartz, the infrared stimulated luminescence (IRSL) of K-feldspar saturates at higher dose, which has great potential for extending the dating limit. However, dating applications with K-feldspar has been hampered due to anomalous fading of the IRSL signal. The post-IR IRSL (pIRIR) signal of K-feldspar stimulated at a higher temperature after a prior low-temperature IR stimulation has significantly lower fading rate. Different dating protocols have been proposed with the pIRIR signals and successful dating applications have been made. In this study, we review the development of various pIRIR dating protocols, and compare their performance in estimating the equivalent dose (De). Standard growth curves (SGCs) of the pIRIR signals of K-feldspar are introduced. Single-grain K-feldspar pIRIR dating is presented and the existing problems are discussed.
Highlights
Stimulated luminescence (OSL) dating is applied to date the last exposure event of a mineral grain to sunlight [1]
The Optically stimulated luminescence (OSL) ages are obtained by the equation: Age = De/Dr, where De is the equivalent dose, representing the radiation dose that mineral grains have received after being blocked from sunlight, and the Dr is the environmental dose rate mainly dominated by the radioactive elements U, Th, K
Studies have shown that the quartz OSL ages were underestimated when the samples were older than ~100 ka [5,6,7], a situation usually attributed to the early saturation behavior of quartz OSL signal [8]
Summary
Stimulated luminescence (OSL) dating is applied to date the last exposure event of a mineral grain to sunlight [1]. Fading correction method has been proposed to address this problem [14,20,21] With this solution, the fading rate of IRSL signal for each individual sample needs to be measured, which requires a large amount of laboratory work. An isochron dating method has been proposed [30,31] In this method, it is assumed that the IRSL signal induced by internal dose does not fade, and De values of K-feldspar fractions with different grain sizes need to be measured, which is laborious. It is assumed that the IRSL signal induced by internal dose does not fade, and De values of K-feldspar fractions with different grain sizes need to be measured, which is laborious It would be highly advantageous if a non-fading signal of K-feldspar could be identified. We briefly introduce the pIRIR developments before 2014, and focus on the improvements since 2014
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