MÖSSBAUER SPECTROSCOPY OF TEKTITES AND OTHER NATURAL GLASSESReport as inadecuate




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Abstract : 57Fe Mössbauer measurements on tektites from every major strewn field reveal : 1 the absence of any vestigial crystalline structure involving iron that might be expected in materials produced by meteoritic impact and 2 an exceedingly low Fe3+-Fe2+ ratio, considerably lower than the values obtained by wet chemical analysis. In contrasts, terrestrial impact glasses contained Fe3+ at concentrations easily detectable by Mössbauer spectroscopy and exhibited remarkable inhomogeneities with respect to iron. These results suggest that tektites were not formed from molten terrestrial material produced by meteoritic impact and that the precursor material to tektites was a thoroughly molten material having considerably time to approach equilibrium.





Author: B. Evans L. Leung

Source: https://hal.archives-ouvertes.fr/



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