| Project/Area Number |
12440153
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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 |
地球化学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
HIYAGON Hajime The University of Tokyo, Graduate School of Science, Associate Professor, 大学院・理学系研究科, 助教授 (70192292)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2001: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2000: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | secondary ion mass spectrometry / refractory inclusion / chondrule / magnesium isotopes / oxygen isotopes / rare earth elements / ultra-refractory component / 炭素質隕石 / リム / 同位体異常 / 微量元素 / エネルギーフィルター法 / フリーズソー / イオンマイクロプローブ |
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| Research Abstract |
In this project, I conducted microanalyzes of oxygen (O) isotopes, magnesium (Mg) isotopes and rare earth elements (REE) using secondary ion mass spectrometry (SIMS) on refractory inclusions (CAIs) and chondrules in primitive meteorites and obtained important information on their origin and formation conditions. (1) I studied an inclusion from a CV chondrite and found large vatiations in oxygen isotopes in anorthite grains. I discussed the cause for such isotopic heterogeneity. (2) I studied rim of CAIs using Mg, O and REE analyzes. It was found that Mg isotopes in CAI rims are not fractionated, suggesting that the rims formed not by evaporation, but by condensation from a hot gas. (3) I conducted O, Mg and REE analyzes on an ultra-refractory nodule found in a fine-grained inclusion from the Allende meteorite. I discussed high temperature processes and gas-dust separation in the early solar nebula. (4) I conducted O and REE analyzes on CAIs found in most primitive ordinary chondrites and enstatite chondrites and found similarities between them and those in carbonaceous chondrites, which suggests a common origin for CAIs. (5) I studied O isotopes in FeO-rich and FeO-poor olivine grains in chondrules. I found similarities in their O isotopes in spite of the difference in the redox condition during their formation.
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