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

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Science  01 Dec 2000:
Vol. 290, Issue 5497, pp. 1751-1753
DOI: 10.1126/science.290.5497.1751

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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.

  • * To whom correspondence should be addressed. E-mail: albert00{at}

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

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