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 �g/g 5.19 �g/g
Best wishes,
Bernd
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