| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
In this study, subduction mechanism of nitrogen into the Earth interior by organic component in sediment was investigated. Pyrolysis of aromatic compounds, which is a major component of organic component in sediment was investigated using high-pressure high-temperature experiments. GC/MS analysis of the recovered samples revealed that position of nitrogen atoms in the aromatic rings strongly cause to mechanism of the decomposition and oligomerization/polymerization of aromatic rings. The N-N covalent bond in the heterocyclic aromatic compound is easily dissociated and the aromatic ring consisting of both nitrogen and carbon opens at lower temperatures than that of aromatic hydrocarbons. Nitrogen atoms might be released from organic sediments around 70-80 km in cold subducting slab.
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