| Project/Area Number |
13853001
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
地球化学
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| Research Institution | Nagoya University |
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Principal Investigator |
TANAKA Tsuyoshi Nagoya University, Graduate School of Environmental Studies, Professor, 大学院・環境学研究科, 教授 (00236605)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Koshi Nagoya University, Graduate School of Environmental Studies, Assoc.Prof., 大学院・環境学研究科, 助教授 (70183689)
MINAMI Masayo Nagoya University, Center for Chronological Research, Assoc.Prof., 年代測定総合研究センター, 助教授 (90324392)
MIMURA Koichi Nagoya University, Graduate School of Environmental Studies, Assoc.Prof., 大学院・環境学研究科, 助教授 (80262848)
ASAHARA Yoshihiro Nagoya University, Graduate School of Environmental Studies, Assist.Prof., 大学院・環境学研究科, 助手 (10281065)
TANIMIZU Masaharu Japan Marine-Earth Sci. & Tech.Studies, Researcher, 技術研究員 (20373459)
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| Project Period (FY) |
2001 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥114,920,000 (Direct Cost: ¥88,400,000、Indirect Cost: ¥26,520,000)
Fiscal Year 2005: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2004: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2003: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
Fiscal Year 2002: ¥13,520,000 (Direct Cost: ¥10,400,000、Indirect Cost: ¥3,120,000)
Fiscal Year 2001: ¥83,850,000 (Direct Cost: ¥64,500,000、Indirect Cost: ¥19,350,000)
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| Keywords | La-Ce decay system / Sm-Nd decay system / Meteorite / Rare earth elements / Mass spectrometry / Cerium anomaly / Pre-solar events / Radiometric age / サマリウム-ネオジム放射壊変系 / ランタン-セリウム放射壊変系 / ランタ-セリウム放射壊変系 / イン石 |
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| Research Abstract |
1)The finding of six CAI inclusions with Ce anomaly from Allende meteorite.
Ninety CAI inclusions from Allende meteorite were analyzed for REE by INAA method. The CAI was classified into three groups by their REE abundance pattern. Six inclusions among them were found to have negative Ce anomaly.
2)The advancement of the mass spectrometry for trace amount of Ce-Nd-Sr radiogenic isotopes acc urately.
The analytical results for repeated analyses are 0.0225889±0.0000013 and 0.0168810±0.0000030 for ^<138>Ce/^<142>Ce and ^<136>Ce/^<142>Ce, respectively.
3)The development of Rb-Sr isochron dating technique using the single mineral grain.
This method enables us to draw an isochron by Rb/Sr heterogeneity reside inside the mineral grain. A K-feldspar of a dyke from Gifu Prefecture shows magmatic event and a chlorite in the same rock shows an alteration date.
4)Many applications of ^<138>La-^<138>Ce,^<147>Sm-^<143>Nd,^<87>Rb-^<87>Sr isotope systematics to various geochemistry and cosmochemistry.
Ce and Nd isotopes and REE pattern of Barberton sedimentary rocks were examined. Ce anomaly found in the chert was regarded as a proof of air oxygen in atmosphere. The new data indicate that the Ce anomaly was formed at 1.1Ga.
5)The development of Sm isotopes measurement technique using double spikes and its application Our technique achieved to measure Sm isotope variations with accuracy of 0.03‰/amu(1SD) using ^<150>Sm-^<154>Sm double spikes.
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