| Project/Area Number |
18540448
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Hokkaido University of Education |
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Principal Investigator |
GANZAWA Yoshihiro Hokkaido University of Education, Faculty of Education, Professor (40161400)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,710,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2006: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Red thermoluminescence / single gain division method / terrace deposits / quartz / OIS5e / OIS7 / single aliquot regenerative doses (SAR) / 赤色熱蛍光 / 年代測定 / 石英 / 段丘堆積層 |
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| Research Abstract |
Red thermoluminescence (RTL) dating of terrace deposits in northern Japan was evaluated from a single quartz grain. Because of the strong RTL resistance property of quartzes to daylight bleaching, previous methods determined the apparent equivalent dose (Ap-De) and the residual level (Rl) independently using two multigrain aliquots. We devised a new method, a single gain division method, to obtain the Ap-De and RI from divided fragments of a single grain, which were formed by using a hammer and nail. The newly developed RTL equipment enabled us successfully to detect minimum RTL signals (about 20Gy) from a 400μm size single quartz grain. Two samples of terrace deposits were used to evaluate the practicability of the new method. The RTL ages of 241±20ka and 113ka±17ka, which were determined by minimum equivalent doses (De) deduced from the single aliquot regenerative doses (SAR) Ap-De and SAR RI-De agreed well with the eras of OIS7 and OIS5e, respectively, estimated by geological evidence.
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