| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Based on the iron and oxygen isotope compositions of Paleoproterozoic lateritic weathering profile discovered in Botswana (Yamaguchi et al., 2007; EPSL), a significant negative correlation between iron and oxygen isotope compositions (the more severe/advanced the lateritization was, the more enriched in heavy iron isotope and the more depleted in heavy oxygen isotope the profile has) was discovered for the first time. Then, a numerical calculation suggests that the water-rock ratios for such lateritization would have been around 10,000~100,000 (similar to modern values), lateritization occurred in (sub)tropical environment in the past, and the oxygen isotope composition of seawater 2.2 billion years ago was 0 per mil.
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