The formation age of the Brachina meteorite |
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| Authors: | Ghislaine Crozaz Paul Pellas |
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| Institution: | 1. Earth and Planetary Sciences Department and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130U.S.A.;2. Laboratoire de Minéralogie du Muséum et C.N.R.S., 61 rue Buffon, 75005 Paris France |
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| Abstract: | Nuclear particle tracks were studied in various phases from the Brachina meteorite, which was classified until recently as a chassignite. Fission tracks due to the decay of244Pu(T12 = 82m.y.) were observed and indicate that Brachina formed ～ 4.5 b.y. ago in a parent body which was most probably asteroidal in size. Contrary to what has been previously suggested 7], there is no need to postulate a Martian origin for this meteorite. This conclusion is supported by independent evidence obtained by other groups. |
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