[meteorite-list] Re: Osmium ratios in irons and parent body size(s)

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:28 2004
Message-ID: <3CC28E16.17D17105_at_lehrer1.rz.uni-karlsruhe.de>

"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 für 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. ALLÈGRE (1998) Rhenium-187 / osmium-187 in
iron meteorites and the strange origin of the Kodaïkanal 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).
Received on Sun 21 Apr 2002 06:01:58 AM PDT