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

From: E.P. Grondine <epgrondine_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:28 2004
Message-ID: <20020421014541.92206.qmail_at_web11604.mail.yahoo.com>

Great thanks, Bernd - once again your efforts come to
the rescue -

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).

The rest of the work on this problem, and there is
plenty of it, is "theoretical" at best.

I'm going to have to go off the meteorite list again
in a few days, so if anyone else has anything to offer
on this problem, please post before then...

ep
 


--- Bernd Pauli HD
<bernd.pauli_at_lehrer1.rz.uni-karlsruhe.de> wrote:
> E.P. Grondine wrote:
>
> > Any idea as to osmium ratios in irons ...?
>
> Hi E.P. and List,
>
> Here is what I can come up with:
>
> CREASER R.A. et al. (1992) Isotopic analysis of Os
> and Re with negative
> thermal ion mass spectrometry and application to the
> age and evolution
> of iron meteorites (Meteoritics 27-3, 1992, A212):
>
> Osmium Bennett County Coahuila Tocopilla
>
>
> Os 59.6±0.1 ppm 9.87±0.02
> 1.062±0.002
> 187 Os/188 Os 0.12503±5 0.14158±7 0.16913±15
>
>
> Osmium Negrillos Cape York C.Diablo
> Tlacotepec
>
> Os 69.4±0.1
> 187Os / 188Os 0.12315±2 0.13374±9 0.13464±11
> 0.12068±8
>
>
> ESAT T. et al. (1991) Negative thermal ionization
> and isotope dilution
> applied to the determination of Re and Os
> concentrations and Os isotopic
> compositions in irons (Meteoritics 26-4, 1991,
> A333):
>
> Osmium Henbury Cape York
> Kyancutta
>
> Os 14.68 ppm 2.497 ppm
> 0.8746 ppm
> 187Os / 186Os 1.066 1.118
> 1.254
>
>
> BROOKS R.R. et al. (1992) Elemental abundance data
> for the Manitouwabing
> iron meteorite (Meteoritics 27-2, 1992, 186):
> Manitouwabing Madoc
> Osmium 0.73 µg/g 5.19 µg/g
>
>
> Best wishes,
>
> Bernd
>
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Received on Sat 20 Apr 2002 09:45:41 PM PDT