Primordial refractory metal particles in the Allende meteorite |
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| Authors: | M Blander LH Fuchs C Horowitz R Land |
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| Institution: | Argonne National Laboratory, Argonne, IL 60439, U.S.A. |
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| Abstract: | Refractory metal particles containing Os, Re, W, Mo, Ir, and Ru were observed in a Ca-Al-rich inclusion in the Allende meteorite. These particles are the closest to unaltered primordial metal condensates from a nebula yet reported, and appear to have been isolated from the nebula before the condensation of refractories was complete. Computer calculations of condensation indicate that the temperature of isolation appears to be close to the calculated temperature of first formation of oxides (~ 1620 K at 10?4 atm) indicating that isolation may have been effected by coating of the particles by oxides. |
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