The major element chemistry of Libyan desert glass and the mineralogy of its precursor

Details The major element chemistry of Libyan desert glass and the mineralogy of its precursor The major element chemistry of Libyan desert glass and the mineralogy of its precursor

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981metic..16..247f&link_type=abstract

Meteoritics, vol. 16, Sept. 30, 1981, p. 247-259.

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Chemical Analysis, Geochemistry, Glass, Libyan Desert, Mineralogy, Sandstones, Structural Properties (Geology), Chemical Composition, Photogeology, Meteorites, Tektites, Major Elements, Chemistry, Glasses, Distribution, Comparisons, Analysis, Electron Microprobe, Aluminum, Iron, Titanium, Mixing, Diffusion, Magnesium, Oxides, Silicates, Melts, Mineralogy, Grains, Minerals, Origin, Geology, Techniques, Data, Impact Craters, Composition, Lithology, Procedure, Libyan Desert Glass

Scientific paper

Chemical analyses of four specimens of Libyan desert glass, a natural, high-silica glass believed to have formed as the result of a hypervelocity meteorite impact on the western desert of Egypt, are presented. Bulk analyses of specimens chosen to represent the color range of the glass exhibit very narrow chemical ranges for SiO2 (97.38-98.25 wt %), Al2O3 (1.16-2.26 wt %), total Fe (0.15-0.60 wt % as Fe2O3) and TiO2 (0.13-0.19 wt %), with measurable MgO found in only one specimen. Microprobe analyses show that Al, Fe and Ti are all positively correlated with one another and are almost ubiquitously distributed throughout the glass, while Mg is sharply limited in appearance and correlates only with Fe. Results indicate that the parent material was a sand or sandstone composed of quartz grains coated with a mixture of kaolinite, hematite and anatase. It is pointed out, however, that chemical comparisons may not prove sufficient to identify the presently unknown parent crater.

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