| タイトル | A CAI in the Ivuna CI1 Chondrite |
| 本文（外部サイト） | http://hdl.handle.net/2060/20110004909 |
| 著者（英） | Mikouchi, T.; Ross, D.; Hagiya, K.; Satake, W.; Le, L.; Zolensky, M.; Frank, David R.; Martinez, J.; Peslier, A.; Ohsumi, K. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2011-01-01 |
| 言語 | eng |
| 内容記述 | We have recently discovered the first well-preserved calcium aluminum-rich inclusion (CAI) in a CI1 chondrite (Ivuna). Previously, all CI1 chondrites were thought to be devoid of preserved CAI and chondrules due to the near total aqueous alteration to which their parent body (bodies) have been subjected. The CAI is roughly spherical, but with a slight teardrop geometry and a maximum diameter of 170 microns (fig. 1). It lacks any Wark-Lovering Rim. Incipient aqueous alteration, and probably shock, have rendered large portions of the CAI poorly crystalline. It is extremely fine-grained, with only a few grains exceeding 10 microns. We have performed electron microprobe analyses (EPMA), FEG-SEM imaging and element mapping, as well as electron back-scattered diffraction (EBSD) and synchrotron X-ray diffraction (SXRD) in order to determine the fundamental characteristics of this apparently unique object. |
| NASA分類 | Geophysics |
| レポートNO | JSC-CN-22691 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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