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Science 1 December 2000:
Vol. 290. no. 5497, pp. 1751 - 1753
DOI: 10.1126/science.290.5497.1751
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Reports

The Formation of Chondrules at High Gas Pressures in the Solar Nebula

Albert Galy,*dagger Edward D. Young, Richard D. Ash, R. Keith O'Nions

High-precision magnesium isotope measurements of whole chondrules from the Allende carbonaceous chondrite meteorite show that some aluminum-rich Allende chondrules formed at or near the time of formation of calcium-aluminum-rich inclusions and that some others formed later and incorporated precursors previously enriched in magnesium-26. Chondrule magnesium-25/magnesium-24 correlates with [magnesium]/[aluminum] and size, the aluminum-rich, smaller chondrules being the most enriched in the heavy isotopes of magnesium. These relations imply that high gas pressures prevailed during chondrule formation in the solar nebula.

Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UK.
*   To whom correspondence should be addressed. E-mail: albert00{at}esc.cam.ac.uk

dagger    Present address: Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Supra-Canonical 26Al/27Al and the Residence Time of CAIs in the Solar Protoplanetary Disk.
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An Overview of Isotopic Anomalies in Extraterrestrial Materials and Their Nucleosynthetic Heritage.
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The Isotope Geochemistry and Cosmochemistry of Magnesium.
E. D. Young and A. Galy (2004)
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