2009 Fiscal Year Final Research Report
Chemical evolution in the solar nebula based on the chondrite matrix
| Project/Area Number |
19740336
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | Kyushu University |
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Principal Investigator |
OKAZAKI Ryuji Kyushu University, 理学研究院・地球惑星科学, 助教 (40372750)
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| Project Period (FY) |
2007 – 2009
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| Keywords | エンスタタイトコンドトライト / 元素分別 / 原始太陽系星雲 / マトリックス物質 |
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| Research Abstract |
Optical/electron microscopy and Raman spectroscopy have been carried out about EH3 chondrites (Sahara 97096, 97121, 97158). There are a pyroxene chondrule surrounded by a fine-grained rim consisting of low-Ca pyroxene, plagioclase (glass), SiO-rich phases, Fe-Ni metal, and troilte. The chemical composition of the fine-grained rim is similar to CI-chondrite but different in some elements. This suggests that chemical fractionation in the solar nebula has occurred under the highly reduced condition. The fine-grained rim contains graphite-like matter showing variable Raman spectra, as found in IDPs that originate from comets. This indicates that the fine-grained rim in EH3 chondrites is composed of primitive and unequilibrated materials.
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