Computer Science
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.353..839s&link_type=abstract
Nature (ISSN 0028-0836), vol. 353, Oct. 31, 1991, p. 839-842.
Computer Science
45
Cretaceous-Tertiary Boundary, Geochemistry, Impact Melts, Metallic Glasses, Silica Glass, Andesite, Chemical Composition, Haiti, Isotopes, Limestone, Sulfur, Trace Elements
Scientific paper
New trace elements and stable and radiogenic isotope data are presented which show that the silicic black glass spherules from the K/T boundary layer at Beloc in Haiti are derived from continental crust of andesitic composition, whereas the high-Ca glass formed by melting of evaporite-rich sediment. This is confirmed by melting experiments with evaporite and andesite at 1200-1400 C which approximately reproduce the high-Ca glass. The temperature-dependent variation of sulfur content in synthetic high-Ca glasses indicates a formation temperature of 1300 C for the Haiti glasses. The geology of the impact site inferred from the geochemistry of the Haiti glasses matches the lithologies found in the 180-km Chicxulub structure which occurs in Cretaceous evaporite deposits in Mexico. The high sulfur content of the calcic glasses suggests that the impact may have generated significant emissions of sulfur dioxide to the atmosphere, causing short-term global cooling.
Bonte Ph.
Chaussidon Marc
D'Hondt Steven
Métrich Nicole
Pradel Ph.
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