Mathematics – Logic
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37..273s&link_type=abstract
Earth and Planetary Science Letters, vol. 37, no. 2, Dec. 1977, p. 273-284. Research supported by the Natural Environment Resea
Mathematics
Logic
3
Iron Meteorites, Meteoritic Composition, Mineralogy, Chemical Composition, Meteoritic Microstructures, Nickel, Photomicrographs, Textures
Scientific paper
Group IC is a new group of ten iron meteorites containing 6.1-6.8% Ni. The Ni concentrations are positively correlated with As (4-9 μg/g), Au (0.6-1.0 μg/g) and P (0.17-0.40%) and negatively correlated with Ga (54-42 μg/g), Ir (9-0.07 μg/g) and W (2.4-0.8 μg/g). These correlations and the slopes of the least squares lines on logarithmic interelement plots are similar to those observed in group IIIAB and several other large groups. Group IC, like all other groups, has a number of characteristic mineralogical features; abundant cohenite and chromite, cylindrical sulphide inclusions, and the absence of silicates and graphite in sulphides. What makes group IC different from other chromite, cylindrical sulphide inclusions, and the absence of silicates and graphite in sulphides. What makes group IC different from other groups is the extraordinary diversity of mineral textures amongst the ten members. Order-of-magnitude estimates of the cooling rates from kamacite bandwidths and bulk Ni contents suggest that cooling rates at 900°K varied from around 1 to 104 °K My-1 probably vary from 20 to 25% Ni in the fast cooled members to nearly double this figure in the more slowly cooled members. Similarly, precursor grain sizes range from 2 to 5 cm in the former, but exceed 25 cm in the latter. The chemical fractionations in group IC, which are believed to have been produced during solidification of molten iron, are not correlated with the cooling rates. It is suggested that soon after the solidification of IC irons from a single metal pool, the irons were widely dispersed by collision and subsequent accretion, so that they cooled through 900°K at greatly differing burial depths.
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