| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2011: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2010: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2009: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
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| Research Abstract |
Because weathering is a mineral-water-atmosphere interaction, a weathering profile retains records of atmospheric oxygen level at the time of weathering. Especially, the Fe concentration in a weathering profile reflects an atmospheric oxygen level. Mineral dissolution and Fe oxidation experiment under low O^2 conditions, analysis of paleosols(ancient weathering profiles) and weathering model reveal that the atmospheric oxygen level changed from<10^<-6> to> 10^<-3> atm between 2. 5 and 2. 0 billion years ago. This increase would have affected ocean chemistry and life evolution.
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