Platinum Group Elements in Howardites and Polymict Eucrites: Implications for Impactors on the HED Parent Body
Most of the HED meteorites are breccias. These HED breccias consist of different proportions of eucrites, diogenites, and other minor components. Crystalline eucrites and diogenites generally have very low PGE (platinum group element) abundances due to metal-silicate fractionation. PGEs are strongly...
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| Main Authors: | , , |
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| 格式: | Proceeding |
| 语言: | English |
| 出版: |
2010
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| 主题: | |
| 在线阅读: | http://ir.unimas.my/id/eprint/31365/1/PLATINUM%20GROUP.pdf http://ir.unimas.my/id/eprint/31365/ |
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| 总结: | Most of the HED meteorites are breccias. These HED breccias consist of different proportions of eucrites, diogenites, and other minor components. Crystalline eucrites and diogenites generally have very low PGE (platinum group element) abundances due to metal-silicate fractionation. PGEs are strongly partitioned into FeNi metals (core). However, many HED breccias have relatively high abundances of PGEs. The presence of chondritic
materials was inferred from siderophile elemental data
[1] and carbonaceous chondrite clasts were found in
howardites and polymict eucrites [2, 3]. Because of the
low PGE abundances in crystalline rocks, PGEs can be
used as signature elements to identify impactors [1,4].
By using PGE data of these polymict breccias, we aim
to discuss the origin of impactor materials that caused
wide spread brecciation on the parent body in the early
solar system. |
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