| Budget Amount *help |
¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2011: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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| Outline of Final Research Achievements |
Our solar system grew in dens protoplanetary solar mebula composed of mainly hydrogen and helium gas with minor amounts of heavier elements and dusts. The nebula had dissipated at some stage of the solar system formation, resulted in clear up of the solar system. We intended to give a constraint on the timing of clear up based on noble gas composition and I-Xe age determination for meteorites showing brecciated structure and/or heavily shocked appearance.
As far as the results obtained for several meteorites with heavily shocked melt veins and brecciated structure, they were affected by heavy shock much later than the solar system formation. These data indicate an importance to select samples reserving information at the initial stage of breccia formation. Even though the data did not give clear constraints on the timing of nebular dissipation, they do not contradict the findings obtained before in our laboratory.
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