Computer Science
Scientific paper
Jun 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29..609e&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 6, pp.609-620
Computer Science
10
Scientific paper
From analyses of glasses from the Ries basin, Bavaria, Germany (4 new analyses) and of moldavites from Bohemia and Moravia mean chemical composition and standard deviations have been calculated. The Ries glasses have been formed by melting of rocks of the crystalline basement. There are no indications for the melting of the 500 m thick sedimentary rocks covering the crystalline basement. Although this basement contains different rock types--granites, diorites, gneisses, amphibolites etc.--the variability of glass composition from different sites is rather low. The melting, therefore, occurred presumably within a limited volume of the basement made up of a paragneiss of rather constant composition. The very different composition of the moldavites can neither be related to the crystalline material which produced the Ries glasses, nor can the differences be explained by normal differential vaporization of the molten glasses during the flight from the Ries to the moldavite sites. Although Ries glasses and moldavites have the same K/Ar-age the common origin of both glasses from the same melt seems to be improbable. In comparison with Ries glasses standard deviations are higher for most oxides of moldavites. Average chemical composition and character of chemical variability of moldavites are difficult to reconcile with a terrestrial origin.
Engelhardt W. V.
Hörz Fred
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