Major element compositional variation within and between different late Eocene microtektite strewnfields

Details Major element compositional variation within and between different late Eocene microtektite strewnfields Major element compositional variation within and between different late Eocene microtektite strewnfields

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987metic..22...61d&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 22, March 31, 1987, p. 61-79.

Computer Science

19

Chemical Composition, Micrometeorites, Spherules, Tektites, Abundance, Crystals, Silicon Oxides, Statistical Analysis, Microtektites, Major Elements, Samples, Terrestrial, Composition, Layers, Strewnfields, Spherules, Statistical Analysis, Stratigraphy, Comparisons, Procedure, Data, Crystals, Abundance, Oxides, Age, Silicon Dioxide

Scientific paper

The major element composition of microspherules from all three late Eocene stratigraphic layers was analyzed using an electron microprobe. The results indicate a major element compositional overlap beween individual microspherules of different microtektite layers or strewn fields. However, multivariate factor analysis shows that the microtektites of the three late Eocene layers follow recognizably different compositional trends. The microtektite population of the North American strewn field is characterized by high concentrations of SiO2, Al2O3, and TiO2; the microspherules of an older layer, the Gl. cerroazulensis Zone, are relatively enriched in FeO and MgO and impoverished in SiO2 and TiO2; while those of the oldest layer in the uppermost G. semiinvoluta Zone are relatively enriched in CaO and impoverished in Al2O3 and Na2O.

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