The Formation of Chondrules at High Gas Pressures in the Solar Nebula
Αlbert GalyDepartment of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UKEdward YoungDepartment of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UKR. D. AshDepartment of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UKR.K. O’NionsDepartment of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UK
2000en
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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.
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