Subduction mechanism of nitrogen to deep Earth by organic component in sediments

• Project/Area Number: 16K17839
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Hokkaido University
• Principal Investigator: SHINOZAKI Ayako 北海道大学, 理学研究院, 助教 (80570506)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥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)
• Keywords: 沈み込み帯 / 窒素 / 芳香族化合物 / 高温高圧実験 / ダイヤモンドアンビル / ピストンシリンダー / GC/MS / 高温高圧 / ダイヤモンドアンビルセル / 固体NMR / 質量分析

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.

Academic Significance and Societal Importance of the Research Achievements

本研究では全地球規模での窒素の循環を明らかにするため、地上から地球の内部にどのような形で窒素が運搬されるかを解明することを目的として沈み込み帯の温度圧力条件を再現した実験を行った。窒素を運搬するリザ―バーとして堆積物中の有機物に着目し芳香族化合物をモデル物質とした実験を進めた、窒素が芳香環に単独で取り込まれている場合には、温度、圧力の上昇に伴って高分子化が起きるが窒素の含有率はほとんど変わらなかったことから

Research Products

• [Int'l Joint Research] Carnegie Institution of Washington(米国)
• [Journal Article] Pressure-induced irreversible amorphization of naphthalene and nitrogen-containing heteroaromatic compounds at room temperature (2020)
  • Author(s): Shinozaki Ayako、Nagai Takaya、Kagi Hiroyuki、Nakano Satoshi
  • Journal Title: Chemical Physics Letters Volume: 739 Pages: 136921-136921
  • DOI: 10.1016/j.cplett.2019.136921
  • Peer Reviewed
• [Journal Article] Decomposition and oligomerization of 2,3-naphthyridine under high- pressure and high-temperature conditions (2019)
  • Author(s): Shinozaki Ayako , Mimura Koichi , Nishida Tamihito
  • Journal Title: SCIENTIFIC REPORTS Volume: 9 Issue: 1 Pages: 1-9
  • DOI: 10.1038/s41598-019-43868-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Reaction between forsterite and nitrogen fluid at high pressure and high temperature. (2019)
  • Author(s): H. Kagi, T. Kubo, A. Shinozaki, T. Okada, H. Ohfuji, A. Nakao
  • Journal Title: Geochemistry International Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Behavior of intermolecular interactions in α-glycine under high pressure (2018)
  • Author(s): Shinozaki, Ayako Komatsu, Kazuki Kagi, Hiroyuki Fujimoto, Chikako Machida, Shinichi Sano-Furukawa, Asami Hattori, Takanori
  • Journal Title: The Journal of Chemical Physics Volume: 148 Issue: 4 Pages: 044507-044507
  • DOI: 10.1063/1.5009980
  • Peer Reviewed
• [Journal Article] Formation of amorphous hydrogenated carbon from compression of benzene (2017)
  • Author(s): Shinozaki Ayako、Kagi Hiroyuki、Mimura Koichi
  • Journal Title: Journal of Physics: Conference Series Volume: 950 Pages: 042057-042057
  • DOI: 10.1088/1742-6596/950/4/042057
  • Peer Reviewed
• [Journal Article] Pressure-induced freeze concentratio of alanine aqueous solution as a novel field of chemical reaction (2016)
  • Author(s): Takahashi S., Kagi H., Fujimoto C., Shinozaki A., Gotou H., Nishida T. and Mimura K.
  • Journal Title: Chemistry Letters Volume: 46 Issue: 3 Pages: 334-337
  • DOI: 10.1246/cl.160992
  • NAID: 130005436526
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Stability and partial oligomerization of naphthalene under high pressure at room temperature (2016)
  • Author(s): A. Shinozaki, K. Mimura, T. Nishida, T. Inoue, S. Nakano, and H. Kagi
  • Journal Title: Chemical Physics Letters Volume: 662 Pages: 263-267
  • DOI: 10.1016/j.cplett.2016.09.042
  • Peer Reviewed / Open Access
• [Presentation] 地球深部・氷天体深部での炭素、水素、窒素関連物質の振る舞い (2019)
  • Author(s): 篠崎彩子
  • Organizer: 日本鉱物科学会2019年年会
  • Invited
• [Presentation] 沈み込み帯における窒素リザーバーとしての芳香族化合物 (2019)
  • Author(s): 篠崎彩子
  • Organizer: 2019年度日本地球化学会年会
• [Presentation] 高温高圧下における窒素含有芳香族化合物の重合反応 (2019)
  • Author(s): 篠崎彩子
  • Organizer: 第60回高圧討論会
• [Presentation] Behavior of nitrogen contained in aromatic compound under high-pressure and high-temperature conditions under deep interior of the Earth (2018)
  • Author(s): 篠崎 彩子
  • Organizer: 日本惑星科学連合大会2018年大会
• [Presentation] 沈み込み帯の温度圧力条件における芳香族化合物中の窒素の挙動 (2018)
  • Author(s): 篠崎 彩子
  • Organizer: 2018年度日本地球化学会年会
• [Presentation] 沈み込み帯の温度圧力条件における窒素を含む芳香族化合物の相変化と化学反応 (2018)
  • Author(s): 篠崎 彩子
  • Organizer: 日本鉱物科学会2018年年会
• [Presentation] 高温高圧下における芳香族化合物の化学反応と窒素の挙動 (2018)
  • Author(s): 篠崎 彩子
  • Organizer: 第59回高圧討論会
• [Presentation] Behavior of nitrogen-containing aromatic heterocyclic compound at high-pressure and high-temperature conditions of shallow subduction zone. (2018)
  • Author(s): 篠崎 彩子
  • Organizer: AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] αグリシンの結晶構造 (2017)
  • Author(s): 篠崎 彩子
  • Organizer: 2016年度量子ビームサイエンスフェスタ
  • Place of Presentation: つくば国際会議場（茨城県つくば市）
  • Year and Date: 2017-03-14
• [Presentation] 沈み込み帯の温度、圧力条件における窒素を含む芳香族化合物の安定性と化学反応 (2017)
  • Author(s): 篠崎 彩子
  • Organizer: 2017年度日本地球化学会年会
• [Presentation] 高温高圧下における窒素含有芳香族化合物の化学反応 (2017)
  • Author(s): 篠崎 彩子
  • Organizer: 第58回高圧討論会
• [Presentation] 中性子回折実験によるグリシンの圧力に伴う水素結合の変化の観察 (2016)
  • Author(s): 篠崎 彩子
  • Organizer: 第57回高圧討論会
  • Place of Presentation: 筑波大学（茨城県つくば市）
  • Year and Date: 2016-10-26
• [Presentation] ピストンシリンダー型高温高圧発生装置による沈み込み帯での芳香族化合物の安定性と化学反応の検討 (2016)
  • Author(s): 篠崎 彩子
  • Organizer: 2016年度日本地球化学会年会
  • Place of Presentation: 大阪府立大学（大阪府堺市）
  • Year and Date: 2016-09-14
• [Presentation] Influence of pressure on chemical reaction of napltahene (2016)
  • Author(s): Ayako Shinozaki
  • Organizer: Goldschmidt2016
  • Place of Presentation: パシフィコ横浜（神奈川県横浜市）
  • Year and Date: 2016-06-26
  • Int'l Joint Research