"E.P. Grondine" concluded: > If I understand the results of your database search, > what it amounts to is that exactly 2 people are > working on recovering the hard data which will allow > for the accurate estimate of parent body size(s).
Hello E.P. and List, No, this is a misleading conclusion or a miscommunication. There is much more work that has been done especially with regard to the Re-Os method for formation-age determination. But with regard to its usefulness J.T. Wasson says on page 113 of "Wasson J.T. (1974) Meteorites, Classi- fication and Properties, Springer Verlag): "The long half-life and the fact that Re and Os are geochemically very coherent elements in meteorites limit the usefulness of this technique. HERR et al. (1961) determined a whole-rock Re-Os isochronic age for iron meteorites fo 4.0�0.8 Gyr." Best regards, Bernd Further useful references: HERR W.W. et al. (1961) Versuch zur Datierung von Eisenmeteoriten nach der Rhenium-Osmium Methode (Zeitschrift f�r Naturforschung 16a, 1961, pp. 1053-1058). MORGAN J. (1970) Anomalous rhenium isotopic ratio in the solar wind: Detection at the nanogram level, Nature 225,1037-1038). BIRCK J.L. (1991) The rhenium osmium chronometer: The iron meteorites revisited (Meteoritics 26-4, 1991, A318). PEGRAM W.J. et al. (1992) Osmium isotopic composition from oceanic basalts (Earth Plan. Sci. Lett. 111, 59-68). REISBERG L. et al. (1993) Os isotope systematics in ocean island basalts (Earth Plan.Sci.Lett. 120, 149-167). SHIREY S.B. et al. (1995) Carius tube digestion for low-blank rhenium-osmium analysis (Anal. Chem. 67, 2136-2141). SMOLIAR M.I. et al. (1995) Rhenium-osmium study of magmatic iron meteorites with low gallium abundances - groups IVA and IVB (abs. Meteoritics 30, 1995, 580). PAPANASTASSIOU D.A. et al. (1995) Rhenium-osmium in iron-nickel and phosphide: The possible determination of internal isochrons for iron meteorites (Meteoritics 30, 1995, 560). SHEN J.J. et al. (1996) Rhenium-osmium in pallasite and mesosiderite metal (abs. Meteoritics 31, 1996, A128). BIRCK J.L. et al. (1996) Rhenium-Osmium isotopes in meteorites (abs. Meteoritics 31, 1996, A014). SMOLIAR M.I. et al. (1997) Rhenium-osmium isochron for IA meteorites: Further refinement of the thenium-187 decay constant (Meteoritics 32-4, 1997, A122). CHEN J.H. et al. (1997) Rhenium-osmium fractionation and isotopic systematics in ordinary chondrites (Meteoritics 32-4, 1997, A027). J.L. BIRCK and C.J. ALL�GRE (1998) Rhenium-187 / osmium-187 in iron meteorites and the strange origin of the Koda�kanal meteorite (Meteoritics 33-4, 1998, 647). CHEN J.H. et al. (2000) Rhenium-osmium fractionation in group IIIAB iron meteorites (MAPS 35-5, 2000, Suppl., A039). ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
