Exploration of pedogenic nano-grains in aeolian dust

• Project/Area Number: 26610162
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Geology
• Research Institution: Kobe University
• Principal Investigator: Hyodo Masayuki 神戸大学, 内海域環境教育研究センター, 教授 (60183919)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: レス / 土壌化 / 二次生成磁性粒子 / ナノ粒子 / 超常磁性 / 帯磁率 / 中国黄土高原 / 風送塵 / 磁性粒子 / マグネタイト / マグヘマイト / 中国レス

Outline of Final Research Achievements

Magnetic susceptibility of loess-paleosol sediments of the Chinese Loess Plateau reflects the degree of pedogenesis, so that it is often used as a proxy of paleo-rainfall. The magnetic enhancement is caused by pedogenic fine magnetic grains of SP or SD size. This study revealed that SP magnetic grains are concentrated in clastics ranging in size from 1 to 10 μm. Magnetically separated grains consist of abundant silicate minerals that are dominated by muscovite and quite small amount of magnetite grains. We conclude that pedogenic SP magnetic grains exist in silicate minerals as inclusions.

Research Products

• [Int'l Joint Research] 中国地質大学(中国)
• [Presentation] Microscopic observations of pedogenic nanoparticles causing magnetic enhancement in Chinese loess deposits (2016)
  • Author(s): 佐野 拓郎、兵頭 政幸、松本 恵、瀬戸 雄介、楊 天水
  • Organizer: 日本地球惑星科学連合
  • Place of Presentation: 幕張メッセ（千葉県・千葉市）
  • Year and Date: 2016-05-22
• [Presentation] 中国レスにおける二次生成磁性ナノ粒子の探査 (2015)
  • Author(s): 佐野 拓郎、兵頭 政幸、松本 恵、瀬戸 雄介、楊 天水
  • Organizer: 地球電磁気・地球惑星圏学会
  • Place of Presentation: 東京大学(東京都)
  • Year and Date: 2015-10-31