| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
(1) Ultra-refractory (UR) metal grains were found in some CAIs from Murchison (CM2) chondrite, which show strong Mg-isotopic fractionation suggesting evaporative loss of Mg. Based on the PGE patterns in the UR metal grains, the evaporation temperature was estimated to be >1600C. (2) Metal standards (Fe-based alloys containing various siderophile elements) were prepared for the SIMS analysis, and relative sensitivity factors for siderophile elements and Fe were determined. (3) Siderophile element analyses were conducted for metal grains in Y-81020 (CO 3.05) chondrite. PGE concentrations were low in large metal grains in the matrix, but large variation were observed in the metal grains in chondrules. This suggests rahter heterogeneous distribution of UR metal grains in the early solar system at the time of chondrule formation.
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