Abundance and distribution of alkali elements in Victorian australites

Details Abundance and distribution of alkali elements in Victorian australites Abundance and distribution of alkali elements in Victorian australites

Nov 1961

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..25..223t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 25, Issue 3, pp.223-228

Physics

3

Scientific paper

New determinations of Li, Na, K, Rb and Cs for eight australites from Victoria average 41 p.p.m. Li, 0.81% Na, 1.76% K, 73 p.p.m. Rb and 2.l p.p.m. Cs. These figures are lower than the averages for tektites from localities west of Victoria, and extend the previously described decrease in concentration of the alkali elements from west to east across Australia ( , 1960). The overall average composition for 24 australites analysed here and previously ( , 1960) is 42 p.p.m. Li, 0.90% Na, 1.85% K, 81 p.p.m. Bb and 2.5 p.p.m. Cs ( K / Rb = 231). A close coherence exists between all pairs of the alkali elements, similar to the classical K / Rb relationship, and is interpreted as due to a physical mixing of two parent components. The average concentrations of the alkali elements are consistent with derivation from a mixture of 75% shale (less water and CO 2 ) and 25% SiO 2 , with possibly some small selective loss of K, Rb and Cs during initial melting.

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