| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2013: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2012: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
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| Outline of Final Research Achievements |
Weathering profiles retain records of atmospheric compositions at the time of weathering. We examined the behaviors of redox-sensitive trace elements in paleosols (ancient weathering profiles) formed in the Neoarchean and Paleoproterozoic. There are two distinct types in trace element behavior in the paleosols in terms of retention and loss, and the timings of the retention and loss differed between trace elements. The results suggest that continental oxidative weathering increased its intensity gradually in almost the whole Paleoproterozoic, and thus, support rather gradual oxygen increase in the same time period. The ocean chemistry could have changed with age accordingly.
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