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In this paper, in order to test the possibility of applying K feldspar pIR-IRSL290 signal(read out at 290C) to date old terrace sediments(up to ~ 200 ka, MIS 7) in Korea, we investigated luminescence properties of pIR-IRSL290 signals in K feldspar extracts from 27 marine and fluvial terrace sediment samples, and these were compared with those of quartz OSL and conventional K feldspar IRSL50 (readout at 50C) signals. The averaged 2D0 value of K feldspar pIR-IRSL290 growth curves was ~ 700 Gy, which is consistent with that of IRSL50 signal, and this is 3 times higher than that for quartz OSL (~ 250 Gy) on average. Where possible, K feldspar pIR-IRSL290 ages were compared with quartz OSL and conventional IRSL50 ages. Our preliminary K feldspar pIR-IRSL290 ages were older than quartz OSL ages by about 200%, while fading rate-corrected conventional IRSL50 ages are in good agreement with those based on quartz OSL. This seems to indicate the possibility of K-feldspar pIR-IRSL290 age overestimation due to the presence of unbleachable pIR-IRSL290 signals, even with a prolonged exposure to sunlight. Both *Corresponding author Tel: jhchoi@kbsi.re.kr E-mail: +82-43-240-5333 Present address National Equipment and Facilities Center, Korea Basic Science Institute, Daejeon 34133, South Korea

amseog haghoeji

Application of Potassium Feldspar pIR-IRSL Method to Dating Quaternary Marine and Fluvial Terrace Sediments in Korea: A Case Study on a Fluvial Terrace and Gusan Fault in Uljin, Korea