Other
Scientific paper
Nov 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36.1205s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 11, pp.1205-1236
Other
58
Scientific paper
Published analyses of trace and minor elements in iron meteorites have been compiled and the distributions interpreted with the chemical groups defined by Wasson. When each element is plotted against Ni on log scales, groups are often clearly resolved with all the members of a group falling within the limits of sampling and analytical error on a straight line. The lines for groups IIIa,b and IVa are generally parallel with IIa,b plotting on a steeper gradient. In contrast to Ga and Qe, many elements show variations within a group which may approach that shown by all the iron meteorites. Group I members have a fairly uniform concentration of elements which are severely fractionated in the other major groups. There are also fewer correlations of elements in group I. Thus the genetic significance of the chemical classification is strengthened by the addition of more parameters which may be used in the definition of the groups. Relationships between groups lia and lib and between Ilia and Illb are confirmed. More important is the record of events during the formation of iron meteorites that the fractionations of elements provide. Two fractionations have occurred, a primary event which established the bulk composition of each group and a secondary event which fractionated the elements within each group. Group I appears to have escaped the secondary fractionation. An examination of possible fractionation mechanisms suggests that the secondary process took place during solidification of iron cores in the parent bodies. The elements It, Os, Pt, Bu and Rh would be enriched in the early Ni-poor solid whilst As, Au, Co, Mo, P, Pd and Sb would concentrate in later solid and produce the observed positive correlations with Ni. These trends are largely those predicted from the binary phase diagrams of Fe, although Cr and Ge behave otherwise. The magnitude of the fractionations could be predicted from the distribution coefficients of elements between solid and liquid Fe-Ni. Unfortunately these can only be guessed and confirmation awaits experiments to indicate their magnitude. The primary fractionation which established the chemical differences between the groups might have occurred during condensation.
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