Physics
Scientific paper
Apr 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26..495m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 26, Issue 4, pp.495-502
Physics
Scientific paper
The concentrations of manganese and titanium have been determined spectrographically in a group of forty-three chondrite falls, forty-five chondrite finds, two carbonaceous chondrites and five achondrites. Significant differences in the concentrations of Mn and Ti are found between chondrites which are seen to fall as distinct from those which are found. Also differences in the Mn and Ti concentrations are indicated between "high" iron group and "low" iron-group chondritic falls. The ratios Mn / Ti are, with few exceptions, quite constant between all groups. The chondrite falls investigated appear to constitute an unbiased sample with average concentrations by weight of Mn 0.26 ± 0.03 per cent and Ti 0.064 ± 0.008 per cent. The best value of the weight ratio Mn / Ti in these chondrites is 4.07 ± 0.36. The differences between various groups and the cosmic abundances of Mn and Ti are discussed. Atomic cosmic abundances of Mn 7470 ± 800 and Ti 2120 ± 260 based on Si 10 6 are calculated.
Brown Harrison
Moore Carleton B.
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