Jul 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1055n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 28, Issue 7, pp.1055-1079
Other
13
Scientific paper
Iron meteorites are low in zinc, the average of 8 octahedrites being ca . 20 ppm, with a range from 3 to about 40 ppm. The distribution of zinc in irons is not uniform, so that reproducible zinc values are often not obtained when 1 g samples are analysed. At least part of the zinc in irons is present in small troilite inclusions. Common chondrites contain 50 ppm zinc on the average, with a range from about 30 to 70 ppm. Most of the zinc is present in the silicates. The troilite in olivine hypersthene chondrites (Holbrook and Kyushu) holds about 10 ppm Zn, the metal phase even less, compared to 40-70 ppm, in the silicates. Some enstatite chondrites (Abee) contain much more zinc ( ca . 700 ppm) than common chondrites, others (Hvittis) less (16 ppm). Achondrites (diogenites and eucrites) contain only a few ppm of zinc. Troilite nodules in irons may contain as much as a few tenths of a per cent of zinc, in contrast to the low zinc in the disseminated troilite of ordinary chondrites, so that in the high temperature differentiation of chondritic material to form nickel-iron and achondritic material, zinc has been transferred from silicate to troilite. Evidence is offered for the belief that the high troilite content of enstatite chondrites is due to the introduction of iron sulfide as such, and does not result from interaction of iron with volatile sulfur compounds or sulfur. Both the high and low zinc contents of enstatite chondrites are speculatively attributed to the partial melting and gravitative transfer of molten troilite which extracted zinc from chondritic material of average composition. An attempt is made, on the basis of the hypothesis that achondrites and irons represent differentiated chondritic material of average chondrite composition, to obtain the balance of zinc and other chalcophilic elements between the original material and the products. The seemingly largely missing troilite in the products introduces serious uncertainties in such considerations, and calculations based on data available at present seem to show a deficiency of zinc and some other chalcophilic elements in the combined differentiates. The best estimates of element abundances in meteoritic matter as we know it are considered to be obtainable from chondrite averages based on common, enstatite and carbonaceous chondrites. The inclusion of the latter two types of chondrites seems to be necessary for many chalcophilic elements that are concentrated by large factors in them.
Nishimura Masakichi
Sandell E. B.
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