2013 Fiscal Year Final Research Report
Origin of heterogeneous isotope distribution for heavy elements in the early solar system
| Project/Area Number |
23340171
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
HIRATA Takahumi 京都大学, 大学院・理学研究科, 教授 (10251612)
NAKAMOTO Taishi 東京工業大学, 大学院・理工学研究科, 准教授 (60261757)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 高精度同位体分析 / 原始太陽系星雲 / 隕石 / 安定同位体 / TIMS / 同位体異常 |
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| Research Abstract |
We have investigated the origin of heterogeneous isotope distribution for heavy elements in the early solar system. Highly precise isotope analyses of Sr, Nd, Te, and Mo were conducted using TIMS for bulk rocks of chondrites and nonchondrites, as well as for chondrite components (e.g., CAIs, chondrules, acid leachates). We found that planetary scale isotope heterogeneities exist only for moderately refractory elements with 50% condensation temperature between 1300K to 1600K (e.g., Cr, Mo, Sr). This implies that isotope heterogeneities for moderately refractory elements were created by a dynamical history of dust grains related to thermal processing, material transportation, and mixing in the protoplanetary disk prior to planetesimal formation, rather than assuming processes such as supernova injection and/or grain-size sorting.
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[Journal Article] Planetary-scale strontium isotopic heterogeneity and the age of volatile depletion of early solar system materials2012
Author(s)
Moynier, F., Day, J.M.D., Okui, W., Yokoyama, T., Bouvier, A., Walker, R.J. and Podosek, F.A
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Journal Title
Astrophys. J
Volume: 758
Pages: 45-51
DOI
Peer Reviewed
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[Journal Article] Evaluation of Laser Ablation in Liquid (LAL) technique as a new sampling technique for elemental and isotopic analysis using ICP-mass spectrometry2011
Author(s)
Okabayashi, S., Yokoyama, T.D., Kon, Y., Yamamoto, S., Yokoyama, T., and Hirata, T
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Journal Title
J. Anal. Atom. Spectrom
Volume: v.26
Pages: 1393-1400
DOI
Peer Reviewed
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[Presentation] Strontium isotope heterogeneity within single CAI from Allende2014
Author(s)
Myojo, K., Yokoyama, T., Sano, Y., Takahata, N., Sugiura, N., Wakaki, S
Organizer
Lunar and Planetary Science Conference
Place of Presentation
The Woodlands, TX, USA
Year and Date
20140317-21
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[Presentation] Strontium stable isotope anomalies in Allende chondrules2014
Author(s)
Okui, W., Yokoyama, T., Usui, T., Iwamori, H., Uno, M
Organizer
Lunar and Planetary Science Conference
Place of Presentation
The Woodlands, TX, USA
Year and Date
20140317-21
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[Presentation] Tellurium isotope anomaly in acid resistant fraction of Allende meteorite2014
Author(s)
Fukami, Y., Yokoyama, T., Okui, W. okoyama, T., Usui, T., Iwamori, H., Uno, M
Organizer
Lunar and Planetary Science Conference
Place of Presentation
The Woodlands, TX, USA
Year and Date
20140317-21
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