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search.filters.applied.f.access: openAccess × Author: Murray, Andrew × Author: Tsukamoto, Sumiko × Has files: Yes × WGL Institute: LIAG ×

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    On the applicability of post-IR IRSL dating to Japanese loess
    (Warsaw : De Gruyter, 2011) Thiel, Christine; Buylaert, Jan-Pieter; Murray, Andrew; Tsukamoto, Sumiko
    Recent work on infrared stimulated luminescence (IRSL) dating has focussed on finding and testing signals which show less or negligible fading. IRSL signals measured at elevated temperature following IR stimulation at 50°C (post-IR IRSL) have been shown to be much more stable than the low temperature IRSL signal and seem to have considerable potential for dating. For Early Pleistocene samples of both European and Chinese loess natural post-IR IRSL signals lying in the saturation region of the laboratory dose response curve have been observed; this suggests that there is no significant fading in nature. As a contribution to the further testing of post-IR IRSL dating, we have used 18 samples from two Japanese loess profiles for which quartz OSL and tephra ages up to 600 ka provide age control. After a preheat of 320°C (60 s), the polymineral fine grains (4–11 μm) were bleached with IR at 50°C (200 s) and the IRSL was subsequently measured at 290°C for 200 s. In general, the fading uncorrected post-IR IRSL ages agree with both the quartz OSL and the tephra ages. We conclude that the post-IR IRSL signal from these samples does not fade significantly and allows precise and accurate age determinations on these sediments.
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    The Characteristics of OSL Signal from Quartz Grains Extracted from Modern Sediments in Japan
    (Warsaw : De Gruyter, 2010) Tokuyasu, Kayoko; Tanaka, Kazuhiro; Tsukamoto, Sumiko; Murray, Andrew
    Quartz grains from sediments in Japan are derived from complex mixtures of sources, including volcanic, plutonic, metamorphic and sedimentary rocks. We have measured the OSL signal of quartz grains from modern coastal sediments derived from different source rocks and compared these characteristics with the likely source. Each sample shows a different combination of various OSL components. It is concluded that the source rock affects the characteristics of the OSL components from quartz grains in Japanese sediments. By comparing the LM-OSL signals from volcanic sources with those from various source rocks, it can be deduced that quartz which has a higher fast component ratio is more suitable for dating. We also conclude that volcanic source areas should be avoided. © 2010 GADAM Centre Institute of Physics, Silesian University of Technology. All rights reserved.