Other
Scientific paper
Oct 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960gecoa..20...85t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 20, Issue 2, pp.85-100
Other
6
Scientific paper
Sodium and potassium have been determined by flame photometric methods and lithium, rubidium and caesium by emission spectrographic techniques in fourteen australites from Western Australia, South Australia and the Northern Territory. Arithmetic means of the analytical data are: Li, 42 p.p.m; Na, 0.95 per cent; K, 1.89 per cent; Rb, 84 p.p.m; Cs, 2.7 p.p.m. These figures are of the same order of magnitude as terrestrial abundances, and match the abundances in sedimentary rocks somewhat better than those for igneous rocks. The averages for sodium and potassium are virtually identical to those found by and (1959) for eleven philippinites and indochinites. The dispersion in concentration of the alkali elements is much smaller than in specific terrestrial rock types such as granites, but is distinctly greater than the small dispersion found in chondrites. It is a significant variation, being greater than the limits of analytical precision for the individual elements. All the elements show a close association with one another. Co-efficients of correlation ( r ) range from +0.730 for the pair Li-Rb to +0.962 for the pair Na-K, and the degree of correlation is statistically "highly significant." It is concluded that such a coherence arises from a physical process such as mixing, rather than by chemical means. A regional variation in composition, with higher concentrations of alkali elements towards the west of Australia, is observed.
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