The formation of chondrules at high gas pressures in the solar nebula |
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Authors: | Galy A Young E D Ash R D O'Nions R K |
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Institution: | Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, UK. albert00@esc.cam.ac.uk |
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Abstract: | 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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