Computer Science
Scientific paper
Mar 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..253p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 3, pp.253-266
Computer Science
5
Scientific paper
Twenty-three new major-element analyses of moldavites are reported. The samples include seventeen Bohemian and six Moravian tektites. The ranges in the contents of the various oxides are as follows: SiO 2 , 75.5-80.6; Al 2 O 3 , 9.62-12.64; TiO 2 , 0.268-0.460; Fe 2 O 3 , 0.12-0.31; FeO, 1.42-2.36; MgO, 1.13-2.50; CaO, 1.46-3.71; Na 2 O, 0.31-0.67; K 2 O, 3.26-3.81. The Rb and Sr contents and the Rb / Sr ratios are also reported for the 23 specimens; the ranges are as follows: Rb, 120-160 ppm; Sr, 130-156 ppm; Rb / Sr , 0.82-1.20. The densities and refractive index values range from 2.3312 to 2.3718 g/cm 3 and from 1.486 to 1.495, respectively. In contrast to the australites, the moldavites display significant negative correlations between the alkali metals (Na and Rb) and the alkaline earths. The relationships in the chemical compositions of moldavites appear to be unlike those of sedimentary or igneous rocks. It is suggested that the observed variations in composition are largely due to fractional volatilization. The wide range of Rb / Sr ratios in conjunction with the uniformity of the Sr isotopic composition supports this theory.
Philpotts John A.
Pinson H. Jr. W.
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