Other
Scientific paper
Jul 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962gecoa..26..685t&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 26, Issue 7, pp.685-722
Other
15
Scientific paper
Seventeen complete and an additional seven partial analyses of australites are given, with details of analytical methods. The average composition is as follows: P, 150 p.p.m.; Si, 34.32%; Al, 6.10%; Ga, 8.1 p.p.m.; Cr, 77 p.p.m.; Mg, 1.24%; Li, 42 p.p.m.; Ti, 3960 p.p.m.; Ni, 29 p.p.m.; Co, 15 p.p.m.; Cu, 8.1 p.p.m.; Fe, 3.56%; V, 78 p.p.m.; Zr, 400 p.p.m.; Mn, 770 p.p.m.; Sc, 13 p.p.m.; Na, 0.95%; Ca, 2.50%; Sr, 210 p.p.m.; K, 1.89%; Ba, 630 p.p.m.; Rb, 81 p.p.m.; Cs, 2.5 p.p.m. The analytical data are discussed element by element, and compared with the abundances in chondrites, in several types of igneous rocks, and in sediments. Determinations of Ag, B, Be, Ge, Pb, Ra, Sn, Th, U and Y by other workers are tabulated. The closest match among terrestrial materials to australite composition is given by a mixture of 75% shale and 25% quartz, (corresponding to a sediment intermediate between shale and subgrey- wacke) which contains zircon and calcite as separate components. This composition accounts for the observed element relationships. Of the elements determined here, all show a significant inverse correlation with SiO 2 except Fe 3+ and Zr, which display positive correlations, and Cu, P, Ga, Co, Ca and Sr, which show no significant relation with SiO 2 . The chemical boundary conditions for place of tektite origin are specified. It is concluded that the parent material for australites came from the surface of the earth, or a planet similar to the earth, which possesses a differentiated crust, an oxidizing atmosphere, probably a hydrosphere, and which has had a similar history.
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