Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27...91b&link_type=abstract
Lunar and Planetary Science, volume 27, page 91
Computer Science
Chicxulub, Cretaceous-Tertiary Boundary, Heterogeneity, Proximal Ejecta, Tektites
Scientific paper
Relict tektites from El Mimbral, Mexico are from K/T boundary deposits considered to be proximal ejecta related to the Chicxulub impact crater on the Yucatan peninsula. Our dark-brown Mimbral clasts are from the spherule bed (layer 1 of Bohor & Betterton) just above the latest Maastrichtian Mendez formation and are postulated to have been deposited initially in a shallow water environment. Relict tektites examined in this study are similar in bulk composition to those in previous reports of Mimbral tektites. Previous studies describe compositions determined to be homogenous on the 10-100 micron scale. However, spot analyses of Mimbral glass reveal small scale heterogeneities within individual fragments which were not optically apparent. Elemental mapping was utilized to illuminate heterogeneities in the range of 5 to 100 microns and to more clearly characterize their distribution. Compositional variations determined by mapping have been quantified by spot analysis and are described here.
Bell Mary Sue
Sharpton Virgil L.
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