potentials of luminescence thermochronology, it has not been widely applied because suitable dating protocols that can be routinely and conveniently applied in the laboratory are unavailable. Guralnik et al . (2015) studied the OSL signals from quartz samples and found undesirable OSL characteristics for dating the rocks. King et al . (2016) studied the infra-red stimulated luminescence (IRSL) signals from K-feldspar through the multi-elevated-temperature (MET) protocol ( Li and Li, 2011 ), and indicated the great potential of it. Tang and Li (2015) suggested that
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Yan Li, Sumiko Tsukamoto, Ke Hu and Manfred Frechen
sand deposition are discussed. Our second aim is to investigate the effects of the residual dose in the pIRIR dating of young sediments. The pIRIR 150 protocol is applied on K-feldspar fraction for all samples and the results are compared with the quartz ages to determine the applicability of the protocol for the young dune sediments.
Study area, site description, and sampling
The Lower Liao Plain (LLP) is an alluvial plain located in northeastern China (Fig. 1) . To the north of the LLP, the Horqin dune field is located, which is one of the
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Huot S and Lamothe M, 2003. Variability of infrared stimulated
Toru Tamura, Kazumi Ito, Takahiko Inoue and Tetsuya Sakai
activity on the geomorphology of this region.
Although optically stimulated luminescence (OSL) of quartz grains has generally been the first choice for dating Holocene coastal deposits, problems related to the OSL properties of quartz have been reported from many regions of Japan (e.g., Tsukamoto et al , 2003 ; Watanuki et al , 2005 ; Tokuyasu et al ., 2010 ; Tamura et al ., 2011 , 2015 ). The use of post-infrared (post-IR) infrared stimulated luminescence (IRSL) of K-feldspar at relatively low temperatures ( Thomsen et al , 2008 ; Reimann et al , 2011b