Optically Stimulated Luminescence (OSL) Dating of Shallow Marine Sediments

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  • 浅海成堆積物のＯＳＬ年代測定
  • センカイセイ タイセキブツ ノ OSL ネンダイ ソクテイ

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We examined the OSL dating of shallow marine sediments, for the purpose of dating marine terrace deposits. First, we carried out optical bleaching/heating/HF-etching experiments using quartz grains and determined a sample preparation procedure in our laboratory on the basis of these results. Next, we conducted OSL dating using the multiplealiquot additive-dose method of shallow marine sediments from the upper part the Kioroshi Formation in Ibaraki Prefecture, which are correlated to Marine Oxygen Isotope Stage (MIS) 5e-5c. OSL ages of foreshore and foreshore-shoreface beds are 88-112ka, and are in good agreement with geological/geomorphological data. On the other hand, OSL ages of the backshore bed are younger, and those of the shoreface bed are older than geologically estimated ages. These results show that optical bleaching of OSL of quartz grains during the depositional process of foreshore and foreshore-shoreface beds was complete. Therefore, we conclude that the OSL dating method can date shallow marine sediment using samples from foreshore and foreshore-shoreface beds, and that this method can distinguish terrace deposits formed in MIS 5 from those formed in MIS7 by taking geomorphologic information into account.

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