| Budget Amount *help |
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2010: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
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| Outline of Final Research Achievements |
We cariied out a basic research for geochemical mapping of Sr isotope ratio, which is needed for multiple purposes such as detection of food-producing areas, tracing of patterns of ancient human migration, and culture change in earlier times. First, we revealed that 1) catchment outlet stream sediment (particle size of <180μm) is most suitable as a sample for mapping of Sr isotope ratio, and then that 2) Sr isotope ratio of Bulk Sr in stream sediment reflects that of parent rock and soil around the stream, while Sr isotope ratio of Exchangeable Sr in stream sediment reflects that of water and biological samples of vegetation and fauna growing around the stream. Based on the results, we have completed a nationwide geochemical map of Sr isotope ratio by Sr isotope ratio measurement of 1084 samples of stream sediment in Japan.
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