pre-compaction exposure ages of CAIs in primitive meteorites: clarification of mechanisms of transportation and circulation of materials in the solar nebula

• Project/Area Number: 23684046
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Geochemistry/Astrochemistry
• Research Institution: Kyushu University
• Principal Investigator: OKAZAKI Ryuji 九州大学, 理学(系)研究科(研究院), 助教 (40372750)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥29,640,000 (Direct Cost: ¥22,800,000、Indirect Cost: ¥6,840,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2011: ¥25,090,000 (Direct Cost: ¥19,300,000、Indirect Cost: ¥5,790,000)
• Keywords: 難揮発性包有物 / 原始太陽系星雲 / 物質輸送 / 照射年代 / 浮遊年代 / コンドライト / CAI / 希ガス / 太陽系星雲 / 共鳴イオン化 / Kr-Kr年代 / I-Xe年代 / 星雲浮遊年代

Outline of Final Research Achievements

Five CAIs were found in polished sections prepared from the Allende CV chondrite. Their textural features and chemical compositions were determined by FESEM and EPMA, respectively. Stepped heating noble gas analyses were performed for two large CAIs.
One CAI has concordant exposure ages based on Ne and Kr stable isotopes (T21 and T83, respectively). An apparent age based on 81Kr is consistent with T21 and T83 within experimental uncertainties, suggesting that the pre-compaction exposure is shorter than 5 Ma. However, the further discussion is difficult due to the large experimental uncertainties. Another CAI shows excesses in 80Kr and 82 Kr that are derived from epi-thermal neutron capture of Br. In addition, 129Xe excess due to radiogenic 129I is observed. These excesses indicate this CAI is enriched in halogens.

Research Products

• [Journal Article] Mineralogy and noble-gas isotopes of micrometeorites collected from Antarctic snow. (2015)
  • Author(s): Okazaki, R., Noguchi, T., Tsujimoto, S., Tobimatsu, Y., Nakamura, T., Ebihara, M., Ito, S., Nagahara, H., Tachibana, S., Terada, K., Yabuta, H.
  • Journal Title: Earth, Planets and Space Volume: 未定
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Sylvite and halite on particles recovered from 25143 Itokawa: A preliminary report. (2014)
  • Author(s): Noguchi, T., Kimura, M., Hashimoto, T., Konno, M., Nakamura, T., Zolensky, M. E., Tsuchiyama, A., Matsumoto, T., Matsuno, J., Okazaki, R., Uesugi, M., Karouji, Y., Yada, T., Ishibashi, Y., Shirai, K., Abe, M. and Okada, T.
  • Journal Title: Meteoritics & Planetary Science Volume: 49 Issue: 7 Pages: 1305-1314
  • DOI: 10.1111/maps.12333
  • Peer Reviewed
• [Journal Article] Investigation of cutting method for small samples of Hayabusa and future sample return missions (2014)
  • Author(s): Uesugi M., Noguchi R., Matsumoto T., Matsuno J., Nagano T., Tsuchiyama A., Harada S., Yokoyama K., Yodo Y., Takeda N., Yada T., Yakame S., Karouji Y., Ishibashi Y., Abe M., Okada T., Fujimura A., Ebihara M., Kitajima F., Nagao K., Nakamura T., Naraoka H., Noguchi T., Okazaki R. and Yurimoto H.
  • Journal Title: Meteoritics & Planetary Science Volume: 49 Issue: 7 Pages: 1186-1201
  • DOI: 10.1111/maps.12322
  • Peer Reviewed
• [Journal Article] Mineral chemistry of MUSES-C Regio inferred from analysis of dust particles collected from the first-and second-touchdown sites on aster oid Itokawa (2014)
  • Author(s): Nakamura, T., Nakato, A., Ishida, H., Wakita, S., Noguchi, T., M. E. Zolensky., Tanaka, M., Kimura, M., Tsuchiyama A., Ogami, T., Hashimoto, T., Konno, M., Uesugi, M., Yada, T., Shirai, K., Fujimura, A., Okazaki, R., S. A. Sandford., Ishibashi, Y., Abe, M., et al.
  • Journal Title: Meteoritics & Planetary Science Volume: 49 Issue: 2 Pages: 215-227
  • DOI: 10.1111/maps.12247
  • Peer Reviewed
• [Journal Article] Space weathered rims found on the surfaces of the Itokawa dust particles. (2014)
  • Author(s): T. Noguchi, M. Kimura, T. Hashimoto, M. Konno, T. Nakamura, M. E. Zolensky, R. Okazaki, M. Tanaka, A. Tsuchiyama, A. Nak ato, T. Ogami, H. Ishida, R. Sag ae, S. Tsujimoto, T. Matsumoto, J. Matsuno, A. Fujimura, M. Ab e, T. Yada, T. Mukai, M. Ueno, T. Okada, K. Shirai, Y. Ishibashi
  • Journal Title: Meteor. & Planet. Sci Volume: 49 Issue: 2 Pages: 188-214
  • DOI: 10.1111/maps.12111
  • Peer Reviewed
• [Journal Article] Effects of pressure and temperature on the silicon diffusivity of pyrope-rich garnet (2014)
  • Author(s): Akira Shimojuku, Tomoaki kubo, Takumi Kato, Takashi Yoshino, Masayuki Nishi, Tomoki Nakamura, Ryuji Okazaki, Yuki Kakazu
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 226巻 Pages: 28-38
  • DOI: 10.1016/j.pepi.2013.11.002
  • Peer Reviewed
• [Journal Article] Effects of pressure and temperature on the silicon diffusivity of pyrope-rich garnet. (2014)
  • Author(s): Akira Shimojuku, Tomoaki Kubo, Takumi Kato, Takashi Yoshino, Masayuki Nishi, Tomoki Nakamura, Ryuji Okazaki, Yuki Kakazu
  • Journal Title: Physics of the Earth and Planetary Interiors Volume: 226 Pages: 28-38
  • Peer Reviewed
• [Journal Article] Hayabusa return sample curation in the Planetary Material Sample Curation Facility of JAXA. (2013)
  • Author(s): T. Yada, A. Fujimura, M. Abe, T. Nakamura, T. Noguchi, R. Okazaki, K. Nagao, Y. Ishibashi, K. Shirai, M. E. Zolensky, S. Sandford, T. Okada, M. Uesugi, Y. Karouji, M. Ogawa, S. Yakame, M. Ueno, T. Mukai, M. Yoshikawa, and J. Kawaguchi
  • Journal Title: Meteoritics & Planetary Science Volume: 49 Issue: 2 Pages: 135-153
  • DOI: 10.1111/maps.12027
  • Peer Reviewed
• [Journal Article] はやぶさ試料の希ガス同位体組成にもとづく太陽風照射の履歴解読 (2013)
  • Author(s): 馬上謙一，松田伸太郎，岡崎隆司，野口高明
  • Journal Title: 遊星人 Volume: 22 Pages: 86-93
  • Peer Reviewed
• [Journal Article] Hayabusa return sample curation in the Planetary Material Sample Curation Facility of JAXA. (2013)
  • Author(s): T. Yada
  • Journal Title: Meteoritics & Planetary Science Volume: accepted
  • Peer Reviewed
• [Journal Article] Space weathered rims found on the surfaces of the Itokawa dust particles. (2013)
  • Author(s): T. Noguchi
  • Journal Title: Meteoritics & Planetary Science Volume: accepted
  • Peer Reviewed
• [Journal Article] Construction of a newly designed small-size mass spectrometer for helium isotope analysis: Toward the continuous monitoring of 3He/4He ratios in natural fluids. (2012)
  • Author(s): K. Bajo
  • Journal Title: Mass Spectrometry Volume: A0009 Pages: 1-10
  • Peer Reviewed
• [Journal Article] Radar enabled recovery of Sutter's Mill, a unique carbonaceous chondrite regolith breccia. (2012)
  • Author(s): P. Jenniskens
  • Journal Title: Science Volume: 338 Pages: 1583-1587
  • Peer Reviewed
• [Journal Article] Preliminary organic compound analysis of microparticles returned from Asteroid 25143 Itokawa by the Hayabusa mission (2012)
  • Author(s): R.Okazaki, et al
  • Journal Title: Geochemical Journal Volume: 46 Pages: 61-72
  • Peer Reviewed
• [Journal Article] Neutron activation analysis of a particle returned from asteroid Itokawa (2011)
  • Author(s): R.Okazaki, et al
  • Journal Title: Science Volume: 333 Pages: 1119-1121
  • Peer Reviewed
• [Journal Article] Irradiation history of Itokawa regolith material deduced from noble gases in the Hayabusa samples (2011)
  • Author(s): R.Okazaki, et al
  • Journal Title: Science Volume: 333 Pages: 1128-1131
  • Peer Reviewed
• [Journal Article] Itokawa dust particles : A direct link between S-type asteroids and ordinary chondrites (2011)
  • Author(s): R.Okazaki, et al
  • Journal Title: Science Volume: 333 Pages: 1113-1116
  • Peer Reviewed
• [Journal Article] Incipient space weathering observed on the surface of Itokawa dust particles (2011)
  • Author(s): R.Okazaki, et al
  • Journal Title: Science Volume: 333 Pages: 1121-1125
  • Peer Reviewed
• [Journal Article] Three-dimensional structure of Hayabusa samples : Origin and evolution of Itokawa regolith (2011)
  • Author(s): R.Okazaki, et al
  • Journal Title: Science Volume: 333 Pages: 1125-1128
  • Peer Reviewed
• [Journal Article] Oxygen isotopic compositions of asteroidal materials returned from Itokawa by the Hayabusa mission (2011)
  • Author(s): R.Okazaki, et al
  • Journal Title: Science Volume: 333 Pages: 1116-1119
  • Peer Reviewed
• [Presentation] 宇宙塵のAr-Ar分析にむけて (2014)
  • Author(s): 岡崎隆司 ,関本俊,飛松優,平山友紀子
  • Organizer: 2014年度同位体比部会
  • Place of Presentation: 茨城県つくば市
  • Year and Date: 2014-11-26
• [Presentation] マイクログラムサンプルのINAA＆Ar-Ar分析 (2014)
  • Author(s): 岡崎隆司
  • Organizer: 京大炉(KUR)を用いた放射化分析の成果と今後の展望
  • Place of Presentation: 京都大学原子炉実験所
  • Year and Date: 2014-11-19
• [Presentation] sub-microgram地球外物質のための超高感度希ガス質量分析システム (2013)
  • Author(s): 岡崎隆司
  • Organizer: 日本質量分析学会
  • Place of Presentation: 茨城
  • Invited
• [Presentation] 希ガス同位体に基づく惑星物質科学 (2013)
  • Author(s): 岡崎隆司
  • Organizer: 日本地球化学会
  • Place of Presentation: 茨城
  • Invited
• [Presentation] A fine-grained polycrustalline micrometeorite: An asteroidal dust particle with a unique mineralogy (2013)
  • Author(s): T. Noguchi, S. Tsujimoto, R. Okazaki, T. Nakamura, M. Ebi-hara, S. Ito, H. Nagahara, S. Tachibana, K. Terada, H. Yabuta
  • Organizer: Annual Meeting of the Meteoritical Society
  • Place of Presentation: Edmonton (Canada)
• [Presentation] Evidence of Minimum Aqueous Alteration in Rock-Ice Body: Update of Organic Chemistry and Mineralogy of Ultracarbonaceous Antarctic Micrometeorite (2013)
  • Author(s): H. Yabuta
  • Organizer: The 44th Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] Chemical Composition of Dust Samples (Micrometeorites) Recovered from Antarctic Snow (2013)
  • Author(s): M. Ebihara
  • Organizer: The 44th Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] Noble Gas Analysis of Two Hayabusa Samples as the First International A/O Investigation: A Progress Report (2013)
  • Author(s): K. Nagao
  • Organizer: The 44th Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] Mineral Ratios of Itokawa Samples ― Difference Between Two Rooms of a Hayabusa Sample Catcher (2013)
  • Author(s): T. Yada
  • Organizer: The 44th Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] Hayabusa-2 Sampler Team. The Sampling System of Hayabusa-2: Improvements from the Hayabusa Sampler (2013)
  • Author(s): S. Tachibana
  • Organizer: The 44th Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] Coexisting Nitrogen-Rich and Poor Organic Materials in Ultracarbonaceous Antarctic Micrometeorite (2012)
  • Author(s): H. Yabuta
  • Organizer: The 75th Annual Meeting of the Meteoritical Society
  • Place of Presentation: Cairns, Australia
• [Presentation] A Mineral Ratio of Itokawa Particles Recovered from the Hayabusa Sample Catcher (2012)
  • Author(s): T. Yada
  • Organizer: The 75th Annual Meeting of the Meteoritical Society
  • Place of Presentation: Cairns, Australia
• [Presentation] Asteroid Itokawa sample curation and distribution for initial analyses and international AO held in the planetary material sample curation facility of JAXA (2012)
  • Author(s): R.Okazaki, et al
  • Organizer: The 43rd Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] Finding of nitrogen-rich organic material in Antarctic ultracarbonaceous micrometeorite (2012)
  • Author(s): R.Okazaki, et al
  • Organizer: The 43rd Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] Space weathering products found on the surface of the Itokawa dust particles : A summary of the initial analysis (2012)
  • Author(s): R.Okazaki, et al
  • Organizer: The 43rd Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] The shock state of Itokawa samples (2012)
  • Author(s): R.Okazaki, et al
  • Organizer: The 43rd Lunar and Planetary Science Conference
  • Place of Presentation: Texas, USA
• [Presentation] Noble Gas Study of the KOREAMET Antarctic Meteorite Collections (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: The Isotope-ratio Mass Spectrometry Meeting
  • Place of Presentation: Busan, Korea
• [Presentation] First direct evidence of asteroidal space weathering found on the surface of Itokawa particles (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: 74th Annual Meeting of the Meteoritical Society
  • Place of Presentation: London, UK
• [Presentation] Examination of organic compounds in the Hayabusa samples from the asteroid Itokawa (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: 74th Annual Meeting of the Meteoritical Society
  • Place of Presentation: London, UK
• [Presentation] Solar noble gas in Itokawa regolith materials returned by the Hayabusa mission (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: 74th Annual Meeting of the Meteoritical Society
  • Place of Presentation: London, UK
• [Presentation] Origin and evolution of Itokawa regolith particles based on three dimensional shapes and sizes of Hayabusa samples (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: 74th Annual Meeting of the Meteoritical Society
  • Place of Presentation: London, UK
• [Presentation] Oxygen and magnesium isotopic pompositions of Asteroid 25143 Itokawa returned by the Hayabusa mission (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: 74th Annual Meeting of the Meteoritical Society
  • Place of Presentation: London, UK
• [Presentation] A preliminary micro-spectroscopic analysis of the carbonaceous matter in the particles recovered by the Hayabusa mission (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: 74th Annual Meeting of the Meteoritical Society
  • Place of Presentation: London, UK
• [Presentation] Mineralogy and thermal history of Itotawa surface particles recovered by Hayabusa mission (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: 74th Annual Meeting of the Meteoritical Society
  • Place of Presentation: London, UK
• [Presentation] Hayabusa sample curation at planetary material sample curation facility in JAXA (2011)
  • Author(s): R.Okazaki, et al
  • Organizer: 74th Annual Meeting of the Meteoritical Society
  • Place of Presentation: London, UK
• [Remarks] 惑星系形成進化学研究分野
  • URL: http://jupiter.geo.kyushu-u.ac.jp/
• [Remarks] 九州大学大学院理学府地球惑星科学専攻惑星系形成進化学研究分野
  • URL: http://jupiter.geo.kyhushu-u.ac.jp/index.html
• [Remarks] 九州大学 大学院理学府 地球惑星科学専攻 惑星系形成進化学研究分野
  • URL: http://jupiter.geo.kyushu-u.ac.jp/index.html