Luminescence dating of loam deposits in Paleolithic sites

从末次内冰川时代以来中国从内陆吹来的风尘的长期影响的角度，对覆盖在日本岛屿陆地表面的广泛的风成粘土层，即所谓的“壤土”进行了调查。我还一直在关注保存有许多旧石器时代遗迹的沉积物。与石英和长石的细小颗粒相比，粘土层是进行热释光/红外光谱测年的有利物质，因为它们在从内陆中国到日本的运输过程中充分暴露在阳光下。对北海道皮里卡市一个旧石器时代遗址的风成沉积物中4-11微米的多矿物组分进行了热释光/红外光谱测年研究。AASD和NAA测量的样品的年剂量率约为2.0-3.8mGy年。小于50ka的年龄与从插入的盖层得出的估计年龄相吻合。实验年龄表明，热释光/红外光谱测年有助于旧石器时代遗址的年龄测定。

The widespread aeolian clay layers, so-called "loam" which cover the land surface of Japan's islands were investigated from the viewpoints of the long-term influence of aeolian dust transported from inland China since the Last internal-Glacier age. I have also been focusing on the deposits in which many Paleolithic remains were preserved. The clay layers, compared of fine particles of quartz and feldspars, are favorable material for TL/IRSL dating because they had been exposed to sunlight sufficiently through transportation process from inland China to Japan.An investigation on TL/IRSL dating of poly-mineral 4-11 micron meter component of aeolian deposits, so called "loam" were attempted for a Paleolithic site, Pirika in Hokkaido.A new designed apparatus inserted BG-39 and U-340 filters were employed for the equivalent dose derived from TL/IRSL determination. Annual dose rates of samples, measured by both AASD and NAA, indicated around 2.0-3.8mGy/year.The age less than 50ka coincided with the estimated ages derived from the intercalated tephra layers. The experimental ages indicated that TL/IRSL dating would contribute to age determination of Paleolithic sites.