2012 Fiscal Year Final Research Report
Chronological study of martian meteorites, shergottites
| Project/Area Number |
22340167
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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 | National Institute of Polar Research |
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Principal Investigator |
MISAWA Keiji 国立極地研究所, 研究教育系, 准教授 (70212230)
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| Co-Investigator(Kenkyū-buntansha) |
KAIDEN Hiroshi 国立極地研究所, 研究教育系, 助教 (10302811)
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| Research Collaborator |
NIIHARA Takafumi Lunar and Planetary Institute, 博士研究員
LARRY E. Nyquist アメリカ航空宇宙局, ジョンソン宇宙センター, 研究員
CHI-YU Shih ヤコブステクノロジー, 研究員
PARK Jisun Lunar and Planetary Institute, 研究員
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| Project Period (FY) |
2010 – 2012
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| Keywords | 同位体 / 放射年代 / 火星 |
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| Research Abstract |
Shock-recovery and annealing experiments on basalt-baddeleyite mixtures were undertaken to evaluate shock effects on U-Pb systematics of baddeleyite. Complete radiogenic lead loss due to shock metamorphism and subsequent annealing was not observed in the baddeleyites studied here. In order to address the timescale over which Mars was geologically active, we have undertaken U-Pb studies on baddeleyite in the Roberts Massif 04261 shergottite. In situ U-Th-Pb isotopic analyses of baddeleyite yield a young 238U-206Pb age of ~200 Ma. The present results imply that Martian magma was still forming only 200 Ma ago, and that Mars had been geologically active until the recent past. The present results confirm the previous Rb-Sr, Sm-Nd and Lu-Hf systematics but conflict with the Pb-Pb ages of 4.1 Ga for shergottites by the Lyon group, possibly due to Martian crustal component(s) which might have been incorporated into constituent phases of shergottites during shock metamorphism.
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Research Products
(22 results)
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[Journal Article] Special features of the new thermal ionization mass spectrometer installed at the National Museum of Nature and Science, and their precision, reproducibility and long term stability on isotopic ratio measurements2012
Author(s)
Yoneda S., Hidaka H., Machdia S., Yokoyama T., Misawa K., Sasaki. S., Kanazawa N
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Journal Title
Special features of the new thermal ionization mass spectrometer installed at the National Museum of Nature and Science, and their precision, reproducibility and long term stability on isotopic ratio measurements. Bull. Natl. Mus. Nat. Sci. Ser. E
Volume: 35
Pages: 1-6
Peer Reviewed
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[Presentation] 40Ar/39Ar ages for maskelynites and K-rich melt from olivine-rich lithology in (Kanazawa) Zagami.2013
Author(s)
Park J., Herzog G.F., Nyquist L.E., Lindsay F., Turrin B., Swisher III, C.C. Delaney, J.S., Shih C.-Y., Niihara T., Misawa K.
Organizer
44th Lunar Planetary Science Conference
Place of Presentation
Houston, TX,USA
Year and Date
20130318-23
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