[meteorite-list] Osmium ratios in irons

From: Bernd Pauli HD <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:28 2004
Message-ID: <3CC1A548.F15C0A36_at_lehrer1.rz.uni-karlsruhe.de>

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
Received on Sat 20 Apr 2002 01:28:40 PM PDT