The chemical classification of iron meteorites--II. Irons and pallasites with germanium concentrations between 8 and 100 ppm

Details The chemical classification of iron meteorites--II. Irons and pallasites with germanium concentrations between 8 and 100 ppm The chemical classification of iron meteorites--II. Irons and pallasites with germanium concentrations between 8 and 100 ppm

Oct 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967gecoa..31.2065w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 31, Issue 10, pp.2065-2076

Computer Science

10

Scientific paper

We report the concentrations of Ni, Ga, Ge and Ir in sixty-one iron meteorites and six pallasites having 8-100 ppm Ge, and eight irons having less than 8 ppm Ge. A new resolved chemical group is described, which is composed of irons which appear to be genetically related. It has two distinct branches, which are designated IIIA (twenty-four irons) and IIIB (fourteen irons). Arguments are given which indicate that the pallasites form an additional resolved group. Three new members of group IVA and a single new member of group IVB are also reported. The remaining meteorites (including four studied previously) are classified into a tentative group of four irons, five doublets, sixteen apparently unique irons, and one mislabelled iron which had been studied previously. Strong correlations are found between the concentrations of the different elements within subgroups IIIA and IIIB. The former shows a positive correlation between Ge (or Ga) and Ni, whereas the latter shows a negative correlation. The compositional differences within resolved groups are discussed in terms of possible fractionation processes. It seems likely that the variations in composition within each group are associated with the original radial distribution within the parent body. The cosmic-ray ages of groups IIIA and IIIB are similar within each subgroup and between the subgroups, with no correlation between age and variations in chemical composition. Short discussions are given regarding the number of parent bodies, and the interpretation of available evidence on cooling rates.

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