A report on some recent major element analyses of tektites

Details A report on some recent major element analyses of tektites A report on some recent major element analyses of tektites

Jun 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..793s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 6, pp.793-806

Computer Science

8

Scientific paper

Forty-two tektites and two "amerikanites" were partially or completely analysed for major elements. Included were 7 moldavites, 1 bediasite, 2 javanites, 15 philippinites, 12 indochinites and 5 australites. Many chemical similarities are noted between the philippinites and indochinites, but the two groups appear different in SiO 2 , Al 2 O 3 , TiO 2 and, in particular, CaO contents. No decrease in alkali element content is observed from Indo-China to the Philippine Islands (i.e. west to east) as is observed across Australia. Selective volatilization cannot account for the differences in the two groups. Perhaps the higher CaO and Sr contents of the philippinites are due to contamination of the parent material by limestone. The CaO contents of the indochinites analysed are distinctly lower, and the MgO contents higher, than the analyses reported in (1940). Real variations, up to approximately 10 per cent for some constituents, exist within the philippinites and indochinites, and even within tektites from restricted sites. Tektites from two sites in the Philippine Islands are identical, within experimental error, in mean composition. The unity of chemical character of the australites and the southeast Asian tektites strongly suggest that they represent one large strewn field. New moldavite analyses do not indicate any systematic chemical variation across the Czechoslovakian strewn field.

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