Oxygen isotope exchange between refractory inclusion in allende and solar nebula gas

被引：139
|
作者：
Yurimoto, H [1 ]
Ito, M
Nagasawa, H
机构：
[1] Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, Tokyo 1528551, Japan
[2] Gakushuin Univ, Dept Chem, Toshima Ku, Tokyo 1718588, Japan
来源：
SCIENCE | 1998年 / 282卷 / 5395期
关键词：
D O I：
10.1126/science.282.5395.1874
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
A calcium-aluminum-rich inclusion (CAI) from the Allende meteorite was analyzed and found to contain melilite crystals with extreme oxygen-isotope compositions (similar to 5 percent oxygen-16 enrichment relative to terrestrial oxygen-16). Some of the melilite is also anomalously enriched in oxygen-16 compared with oxygen isotopes measured in other CAls. The oxygen isotopic variation measured among the minerals (melilite, spinel, and fassaite) indicates that crystallization of the CAI started from oxygen-16-rich materials that were probably liquid droplets in the solar nebula, and oxygen isotope exchange with the surrounding oxygen-16-poor nebular gas progressed through the crystallization of the CAI, Additional oxygen isotope exchange also occurred during subsequent reheating events in the solar nebula.
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页码：1874 / 1877
页数：4
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