Computer Science
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..55..356p&link_type=abstract
Earth and Planetary Science Letters, vol. 55, no. 3, Nov. 1981, p. 356-362. Research supported by the Deutsche Forschungsgemein
Computer Science
11
Abundance, Carbonaceous Chondrites, Concentration (Composition), Iridium, Molybdenum, Neutron Activation Analysis, Data Correlation, Orgueil Meteorite, Refractory Metals
Scientific paper
Fifteen carbonaceous chondrites were analyzed for Mo and Ir by neutron activation analysis combined with a metal extraction method. The results of two Orgueil analyses gave a mean concentration of 915 ppb Mo. This corresponds to 2.51 atoms Mo/1,000,000 atoms Si, which is 50% lower than data reported by Case et al. (1973). The lower Mo concentration for Orgueil was predicted by Suess and Zeh (1973) from semiempirical abundance rules. A constant Mo/Ir ratio is found for C1, C2, and C3V chondrites; C3Os have variable Mo/Ir ratios. These variations are due to variable Ir concentrations. Micron-sized grains enriched in Ir but not in Mo are presumably responsible for these variations. The Mo content of Karoonda is nearly a factor of four lower than that of C3V chondrites.
Palme Herbert
Rammensee Werner
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