The rate of dehydration of the stagnant slab in the mantle transition zone

• Project/Area Number: 16K13900
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Petrology/Mineralogy/Economic geology
• Research Institution: Hokkaido University
• Principal Investigator: Kuritani Takeshi 北海道大学, 理学研究院, 准教授 (80397900)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: マグマ / 水循環 / マントル遷移層 / 停滞スラブ / プレート内火成活動 / 地殻・マントル物質 / 火山

Outline of Final Research Achievements

Geophysical observation has suggested that the mantle transition zone beneath NE China is hydrous, and the subducted Pacific slab is stagnated in the transition zone. To estimate the rate of the dehydration of the stagnant slab, petrological and geochemical analyses were conducted on volcanic rocks of variable ages (60-0 Ma) above the stagnant slab. Unfortunately, the rate of the dehydration could not have been estimated because of no significant temporal variation in the water contents of the source mantle. However, this study showed that the mantle transition zone have been hydrous between 60 and 0 Ma. In addition, this study proposed a general model about the origin of the intraplate magmatism over the stagnant slab.

Research Products

• [Int'l Joint Research] 浙江大学/中国科学技術大学(中国)
• [Journal Article] Mantle hydration and the role of water in the generation of large igneous provinces. (2017)
  • Author(s): Liu, J., Xia, Q.-K., Kuritani, T., Hanski, E. and Yu, H.-R.
  • Journal Title: Nature Communications Volume: 8 Issue: 1 Pages: 1824-1824
  • DOI: 10.1038/s41467-017-01940-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fluid-fluxed melting of mantle versus decompression melting of hydrous mantle plume as the cause of intraplate magmatism over a stagnant slab: implications from Fukue Volcano Group, SW Japan (2017)
  • Author(s): Kuritani, T., Sakuyama, T., Kamada, N., Yokoyama, T., Nakagawa, M.
  • Journal Title: Lithos Volume: 282-283 Pages: 98-110
  • DOI: 10.1016/j.lithos.2017.02.011
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Fluid-fluxed melting of the mantle as the cause of intraplate magmatism over a stagnant slab: implications from Fukue Volcano Group, SW Japan (2017)
  • Author(s): Kuritani, T., Sakuyama, T., Kamada, N., Yokoyama, T., Nakagawa, M.
  • Organizer: JPGU-AGU Joint Meeting 2017
  • Place of Presentation: Makuhari, Chiba
  • Year and Date: 2017-05-20
  • Int'l Joint Research
• [Presentation] Fluid-fluxed melting of the mantle as the cause of intraplate magmatism over a stagnant slab: implications from Fukue Volcano Group, SW Japan (2017)
  • Author(s): Kuritani, T., Sakuyama, T., Kamada, N., Yokoyama, T., Nakagawa, M.
  • Organizer: JpGU2017
• [Presentation] Fluid-fluxed melting of the mantle as the cause of intraplate magmatism over a stagnant slab: evidence from Fukue Volcano Group, SW Japan (2017)
  • Author(s): Kuritani, T., Sakuyama, T., Kamada, N., Yokoyama, T., Nakagawa, M.
  • Organizer: Goldschmidt Conference
  • Int'l Joint Research
• [Presentation] 長崎県五島列島・小値賀島火山群の玄武岩質噴出物の地球化学的研究 (2017)
  • Author(s): 栗谷豪、中川光弘
  • Organizer: 日本地質学会2017愛媛大会