| タイトル | Corundum-Hibonite Inclusions and the Environments of High Temperature Processing in the Early Solar System |
| 本文（外部サイト） | http://hdl.handle.net/2060/20130011098 |
| 著者（英） | Messenger, S.; Needham, A. W. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2013-03-18 |
| 言語 | eng |
| 内容記述 | Calcium, Aluminum-rich inclusions (CAIs) are composed of the suite of minerals predicted to be the first to condense from a cooling gas of solar composition [1]. Yet, the first phase to condense, corundum, is rare in CAIs, having mostly reacted to form hibonite followed by other phases at lower temperatures. Many CAIs show evidence of complex post-formational histories, including condensation, evaporation, and melting [e.g. 2, 3]. However, the nature of these thermal events and the nebular environments in which they took place are poorly constrained. Some corundum and corundum-hibonite grains appear to have survived or avoided these complex CAI reprocessing events. Such ultra-refractory CAIs may provide a clearer record of the O isotopic composition of the Sun and the evolution of the O isotopic composition of the planet-forming region [4-6]. Here we present in situ O and Mg isotopic analyses of two corundum/hibonite inclusions that record differing formation histories. |
| NASA分類 | Lunar and Planetary Science and Exploration |
| レポートNO | JSC-CN-27993 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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