Applicabile OSL dating for fluvial sediments in Japan

2016 Fiscal Year Final Research Report

• Project/Area Number: 26800263
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geology
• Research Institution: Geo-Research Institute (2016); Japan Atomic Energy Agency (2014-2015)
• Principal Investigator: Tokuyasu Kayoko 一般財団法人地域地盤環境研究所, その他部局等, その他 (90721944)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 光ルミネッセンス（OSL)年代測定 / 河成段丘堆積物 / OSL信号特性 / 後背地

Outline of Final Research Achievements

It is still difficult to apply OSL dating to quartz grains from sediments in Japan because the quartz grains are derived from complex mixtures sources. In particular, the application of OSL dating to fluvial sediments is very limited. I therefore challenge to find out optimal OSL dating method to fluvial sediments in Japan. Research findings imply that generation of quartz fast component is based on the quartz origin and that the fast component is not generated by heating after erosion. In addition I measured quartz grains from fluvial terrace sediments along Kiso River, and its adequacy is considered in the correlation with intercalated maker tephra.　The obtained OSL ages are about 40~50 ka. The OSL ages are corresponding to the tephra ages, but as far as we can foresee, being underestimated because the quartz samples were dominant by medium and slow component which is unsuitable for OSL dating.

Free Research Field

第四紀学