Chronology of high-temperature dust formation processes in the solar protoplanetary dust

• Project/Area Number: 16K17837
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Hokkaido University (2017); Japan Aerospace EXploration Agency (2016)
• Principal Investigator: Kawasaki Noriyuki 北海道大学, 理学研究院, 助教 (50770278)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 隕石 / 難揮発性包有物 / Al-Mg年代 / 初期太陽系円盤 / 地球化学 / 宇宙科学

Outline of Final Research Achievements

This study revealed a time duration of condensation processes of high-temperature dusts formed in the solar protoplanetary disk by high-precision dating of Ca-Al-rich inclusions (CAIs) in meteorites. We measured three high-temperature condensate CAIs and they show a formation age spread of 0.17 ± 0.04 Myr. Our findings demonstrate that both condensation and melting of minerals in a hot nebular gas occurred contemporaneously to form various types of CAIs and continued for at least ~0.2 Myr after the birth of the Solar System.

Research Products

• [Journal Article] Crystal growth and disequilibrium distribution of oxygen isotopes in an igneous Ca-Al-rich inclusion from the Allende carbonaceous chondrite (2018)
  • Author(s): Kawasaki, N., Simon, S. B., Grossman, L., Sakamoto, N. and Yurimoto, H.
  • Journal Title: Geochimica et Cosmochimica Acta Volume: 221 Pages: 318-341
  • DOI: 10.1016/j.gca.2017.05.035
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Chronological study of oxygen isotope composition for the solar protoplanetary disk recorded in a fluffy Type A CAI from Vigarano (2015)
  • Author(s): Kawasaki N., Itoh S., Sakamoto N., Yurimoto H.
  • Journal Title: Geochim. Cosmochim. Acta Volume: 169 Pages: 99-114
  • DOI: 10.1016/j.gca.2015.12.031
  • Peer Reviewed / Open Access
• [Presentation] Contemporaneous formation for condensates and melted CAIs inferred from 26Al－26Mg Systematics of CV CAIs (2018)
  • Author(s): Kawasaki N., Park C., Sakamoto N., Park S., Kim H., Kuroda M. and Yurimoto H.
  • Organizer: Solar-System symposium in Sapporo 3S 2018
  • Int'l Joint Research
• [Presentation] Al-Mg systematics of nebular condensates in the Efremovka CV3 chondrite (2017)
  • Author(s): Kawasaki N. and Yurimoto H.
  • Organizer: 48th Lunar and Planetary Science Conference
  • Place of Presentation: ウッドランド（アメリカ）
  • Year and Date: 2017-03-20
  • Int'l Joint Research
• [Presentation] Crystal growth and disequilibrium distribution of O isotopes in an igneous CAI from Allende (2017)
  • Author(s): Kawasaki N., Simon S. B., Grossman L., Sakamoto N. and Yurimoto H.
  • Organizer: Solar-System symposium in Sapporo
  • Place of Presentation: ルスツリゾート（北海道虻田郡）
  • Year and Date: 2017-02-13
  • Int'l Joint Research
• [Presentation] 26Al－26Mg mineral isochrons of nebular condensates from the Efremovka CV3 (2017)
  • Author(s): Kawasaki N. and Yurimoto H.
  • Organizer: Goldschmidt Conference
  • Int'l Joint Research
• [Presentation] アエンデ隕石の火成CAIにみられる鉱物の結晶成長と酸素同位体の非平衡分布との関係 (2017)
  • Author(s): 川崎教行，サイモン スティーブ，グロスマン ローレンス，坂本直哉，圦本尚義
  • Organizer: 日本地球惑星科学連合 連合大会2017年大会
• [Presentation] The origin of oxygen isotope disequilibrium in an Allende Type B1 CAI (2016)
  • Author(s): Kawasaki N., Simon S. B., Grossman L., Sakamoto N. and Yurimoto H.
  • Organizer: Hayabusa 2016: 4th symposium of Solar System Materials/The seventh Symposium on Polar Science
  • Place of Presentation: 国立国語研究所（東京都立川市）
  • Year and Date: 2016-11-29
  • Int'l Joint Research
• [Presentation] Melting of an Allende Type B1 CAI in 16O-rich nebular gas (2016)
  • Author(s): Kawasaki N., Simon S. B., Grossman L. and Yurimoto H.
  • 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
• [Presentation] ヴィガラノ隕石fluffy Type A CAIに記録された初期太陽系円盤の酸素同位体組成変化のAl-Mg年代学 (2016)
  • Author(s): 川﨑教行，伊藤正一，坂本直哉，圦本尚義
  • Organizer: Japan Geoscience Union Meeting 2016
  • Place of Presentation: 幕張メッセ国際会議場（千葉県千葉市）
  • Year and Date: 2016-05-22