Luminescence dating of loam deposits in Paleolithic sites

从末次内冰川期以来中国内陆风沙的长期影响的观点出发，研究了覆盖日本岛屿陆地表面的广泛的风成粘土层，即所谓的“壤土”。我也一直在关注许多旧石器时代遗迹被保存下来的沉积物。粘土层中的石英和长石等细颗粒物在从中国内陆到日本的搬运过程中受到了充分的阳光照射，是进行TL/IRSL测年的有利材料。采用一种新设计的装置，插入BG-39和U-340过滤器，用于TL/IRSL测定的等效剂量。AASD和NAA测量的样品年剂量率约为2.0-3.8mGy/年，年龄小于50 ka，与火山灰夹层的年龄一致。实验年龄表明，TL/IRSL测年方法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.