Computer Science
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..77....1b&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 77, no. 1, Feb. 1986, p. 1-13.
Computer Science
4
Chemical Composition, Petrology, Sedimentary Rocks, Tektites, Asteroids, Comets, Geology, Metal Oxides, Silicon Dioxide, Tektites, Genesis, Formation, Origin, Cations, Abundance, Strewn Fields, Samples, Terrestrial, Silicon Dioxide, Alumina, Alkali, Oxides, Chemistry, Comparisons, Partial Melting, Parent Material, Parameters, Differentiation, Composition, Sedimentary Rocks
Scientific paper
Variations in the composition of tektites and microtektites in different strewn fields are discussed. The effects of SiO2 on the Niggli parameters is investigated. It is observed that as SiO2 increases the proportion of alumina and alkalies in the cations increases, MgO, and FeO decreases, and the CaO remains approximately constant. Data elucidating the cause of these chemical variations to be due to partial melting are examined. Variations in the chemistry of more complex systems such as moldavites and australites are analyzed by reducing the variation diagrams to two-five lineages of the simpler type. The relationship between tektites and parent rocks is studied. The results reveal that the silica-poorest tektites of each variation diagram provide the correlation between the parent rock and the tektite composition.
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