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Science 4 December 1998:
Vol. 282. no. 5395, pp. 1874 - 1877
DOI: 10.1126/science.282.5395.1874
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Reports

Oxygen Isotope Exchange Between Refractory Inclusion in Allende and Solar Nebula Gas

Hisayoshi Yurimoto, * Motoo Ito, Hiroshi Nagasawa

A calcium-aluminum-rich inclusion (CAI) from the Allende meteorite was analyzed and found to contain melilite crystals with extreme oxygen-isotope compositions (~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 CAIs. 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.

H. Yurimoto, Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8551, Japan. M. Ito and H. Nagasawa, Department of Chemistry, Gakushuin University, Mejiro, Toshima, Tokyo 171-8588, Japan.
*   To whom correspondence should be addressed. E-mail: yuri{at}geo.titech.ac.jp

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Oxygen Isotopes of Chondritic Components.
H. Yurimoto, A. N. Krot, B.-G. Choi, J. Aleon, T. Kunihiro, and A. J. Brearley (2008)
Reviews in Mineralogy and Geochemistry 68, 141-186
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Mass-independent Oxygen Isotope Variation in the Solar Nebula.
E. D. Young, K. Kuramoto, R. A. Marcus, H. Yurimoto, and S. B. Jacobsen (2008)
Reviews in Mineralogy and Geochemistry 68, 187-218
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Grain growth control of isotope exchange between rocks and fluids.
M. Nakamura, H. Yurimoto, and E. B. Watson (2005)
Geology 33, 829-832
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Existence of an 16O-Rich Gaseous Reservoir in the Solar Nebula.
A. N. Krot, K. D. McKeegan, L. A. Leshin, G. J. MacPherson, and E. R. D. Scott (2002)
Science 295, 1051-1054
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Stable Isotope Variations in Extraterrestrial Materials.
K. D. McKeegan, K. D. McKeegan, and L. A. Leshin (2001)
Reviews in Mineralogy and Geochemistry 43, 279-318
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