Oxygen isotopic composition of a compound Ca-Al-rich inclusion from Allende meteorite: implications for origin of palisade bodies and O-isotopic environment in the CAI forming region
作者： Guk Lac KIM , Hisayoshi YURIMOTO , Shigeho SUENO
DOI: 10.2465/JMPS.97.161
关键词: Melilite 、 Formation and evolution of the Solar System 、 Mineralogy 、 Isotopes of oxygen 、 Oxygen 、 Mineral 、 Palisade 、 Geochemistry 、 Geology 、 Allende meteorite 、 Inclusion (mineral)
摘要: A calcium-aluminum-rich inclusion (CAI) containing big palisade bodies was found within the Allende meteorite. The bulk composition and mineral assemblages show that CAI belongs to coarse-grained Type B. Oxygen isotopic distributions in are similar those observed typical B CAIs, whereas all minerals including melilite host parts enriched 16O. oxygen distribution indicates exchange of isotopes occurred before trapping palisades into host. were formed separately as small CAIs solar nebula then accumulated together form a large CAI. This suggests possibility during formation, O environment CAI-forming region repeatedly changed from 16O-rich 16O-poor.
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