Evolutional history of planetary materials at the early sage of solarsystem based on I-Xe age determination

• Project/Area Number: 19540512
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geochemistry/Astrochemistry
• Research Institution: The University of Tokyo
• Principal Investigator: NAGAO Keisuke The University of Tokyo, 大学院・理学系研究科, 教授 (40131619)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2007: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 隕石 / 希ガス同位体 / 質量分析 / 中性子照射 / I-Xe年代 / 水質変質 / ハロゲン / 希ガス抽出炉

Research Abstract

我々が立ち上げた国内唯一のI-Xe 年代測定装置を用いて、太陽系初期の惑星形成史を解明するため、非平衡コンドライトや太陽風を含む角礫岩質コンドライトの年代を調べた。この結果、多くのコンドライトが炭素質コンドライトより2000-5000 万年後にリセットされたことを示しており、この間に母天体で水質変質などの変成作用が継続したことが分かって来た。また、中性子照射されたこれら試料に含まれる微量ハロゲンの定量も可能になってきた。

Research Products

• [Journal Article] Noblegases of the Yamato 000027 and Yamato000097 lherzolitic shergottites from Mars (2008)
  • Author(s): Nagao K, Park J. and Choi H.G
  • Journal Title: Polar Science 2 Pages: 195-214
  • Peer Reviewed
• [Journal Article] Noble gases of the Yamato 000027 and Yamato 000097 lherzolitic shergottites from 〓 (2008)
  • Author(s): Nagao K., Park J. and Choi H. G.
  • Journal Title: Polar Science 2 Pages: 195-214
  • NAID: 130004593190
  • Peer Reviewed
• [Presentation] 希ガス質量分析を用いた極微量ハロゲンの検出 (2009)
  • Author(s): 角野浩史、馬上謙一、長尾敬介
  • Organizer: 第57回質量分析総合討論会
  • Place of Presentation: 大阪市(大阪国際交流センター)
  • Year and Date: 2009-05-15
• [Presentation] Noble gas distributions in the Yamato000593 nakhlite deciphered by laser ablationanalysis and mineral separation (2009)
  • Author(s): Nagao K, Park J, Okazaki R., Imae N. and Kojima H
  • Organizer: 40th Lunar and Planetary Science Conference
  • Place of Presentation: Houston, USA
  • Year and Date: 2009-03-24
• [Presentation] Noble gases andcosmic-ray exposure ages of two Martianshergottites, RBT 04262 and LAR 06319 (2008)
  • Author(s): Nagao K. and Park J
  • Organizer: 71st Meeting of the Meteoritical Society
  • Place of Presentation: Matsue, Japan
  • Year and Date: 2008-07-31
• [Presentation] Noble gases and cosmic-ray exposure ages of two Martian shergottites, RBT 04262 and LAR 06319 (2008)
  • Author(s): Nagao K. and Park J.
  • Organizer: 71st Meeting of the Meteoritical Society
  • Place of Presentation: Matsue, Japan
  • Year and Date: 2008-07-31
• [Presentation] Exposure histories of micrometeorites found in a434 kyr old layer in the Dome Fuji ice core, Antarctica (2008)
  • Author(s): Nishiizumi K., Caffee M.W., Kohno M., Misawa K., Nagao K. and Tomiyama T
  • Organizer: 39th Lunar and Planetary ScienceConference
  • Place of Presentation: Houston, USA
  • Year and Date: 2008-03-14
• [Presentation] Noble gases in bulk and mineral separates from the MIL 03346nakhlite (2008)
  • Author(s): Nagao K. and Park J.
  • Organizer: 39th Lunar and Planetary Science Conference
  • Place of Presentation: Houston, USA
  • Year and Date: 2008-03-11
• [Presentation] Noble gasesof the Yamato 000027 and Yamato 000097lherzolitic shergottites (2007)
  • Author(s): Nagao K, Park J. and Choi H
  • Organizer: 31st Symposium onAntarctic Meteorites
  • Place of Presentation: NIPR, Tokyo, Japan
  • Year and Date: 2007-06-06
• [Presentation] Noble gases of the Yamato 000027 and Yamato 000097 lherzolitic shergottites. 31st Symposium on Antarctic Meteorites (2007)
  • Author(s): Nagao K, Park J., Choi H.
  • Organizer: 31st Symposium on Antarctic Meteorites
  • Place of Presentation: NIPR Tokyo, Japan
  • Year and Date: 2007-06-06