| Project/Area Number |
11640473
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | IBARAKI UNIVERSITY |
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Principal Investigator |
KIMURA Makoto IBARAKI Univ., Faculty of Science, Associate Professor, 理学部, 助教授 (20142226)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Meteorite / Chondrite / Solar System / Mineral |
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| Research Abstract |
From 1999 to 2000, I mainly studied enstatite chondrites. The results obtained here are as follows ;
1). These chondrites were subjected to heavy impact process, in comparison with the other group chondrites, suggesting that planetesimals were frequently collided to each other in the inner solar system region.
2). Enstatite chondrites show complicated thermal histories. Some of them were totally to partially melted by impact. Some others cooled rapidly on the surface of the parent bodies, whereas the others cooled slowly in the inner regions of the bodies.
3). I found that some enstatite chondrites should belong to the new grouplets of enstatite chondrite clan. This finding suggests that the precursor materials of these chondrites had much more complicated histories than reported before, and that we should reconsider the classification scheme of this kind of chondrite group.
I also studied shock history of ordinary chondrites, and first discovered jadeite from an H-chondrite. This is also the first discovery of the high-pressure polymorph phase from H-chondrite group. On the basis of this discovery, I reconstructed the shock history of H-chondrites, and suggested that H-chondrites were subjected to much weaker impact process than L-chondrites. This may be reflected that the parent body of H-chondrites was smaller in diameter than that of L-chondrites.
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