Mathematics – Logic
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..31..224r&link_type=abstract
Earth and Planetary Science Letters, vol. 31, no. 2, July 1976, p. 224-238. Research supported by the Deutsche Forschungsgemein
Mathematics
Logic
18
Chondrites, Metal Particles, Meteoritic Composition, Neutron Activation Analysis, Trace Elements, Arsenic, Chondrule, Cobalt, Copper, Gallium, Gold, Iron, Nickel, Particle Size Distribution, Petrology, Size Determination, Tungsten
Scientific paper
Results are discussed for neutron activation analysis of the metallic fractions in eight L-group chondrites and one from the LL group. Three magnetic fractions (coarse, intermediate, fine) were obtained for each meteorite, and percent amounts of Ni, Co, Fe, Cu, As, Ga, W, Au, and Ir were determined. The metal distribution among the different grain sizes is found to vary with petrologic type due to preferential concentrations of kamacite in the coarse fraction and taenite in the others. It is shown that the amounts of Ni, Au, Cu, and Ga decrease in the fine fractions of equilibrated chondrites, probably as a result of dilution by a fine-grained component (plessite). Analysis of Ir enrichment indicates that the amount of Ir and the Ir/Ni ratios increase with decreasing metallic grain size for petrologic types 4-6, suggesting the presence of an enriched very-fine-grained metallic component (possibly plessite) in refractory metals. Ga and W are found to vary in the bulk metals as a direct function of petrologic type, suggesting that substantial amounts of both metals exist in silicate phases in lower metamorphic petrologic types.
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