Physics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.307..224g&link_type=abstract
Nature (ISSN 0028-0836), vol. 307, Jan. 19, 1984, p. 224-228. Research supported by the U.S. Department of Energy.
Physics
23
Abundance, Geochemistry, Iridium, Kaolinite, Stratigraphy, Structural Basins, Colorado, Fallout, Meteorite Craters, Mineralogy, New Mexico, Trace Elements
Scientific paper
Elemental abundance patterns across the Cretaceous-Tertiary (K-T) boundary over a large area with the common paleo-environmental setting in the Raton Basin of northeastern New Mexico an southeastern Colorado are reported. It is concluded from the abundances combined with clay minerology, stratigraphy, and pollen data, that the Ir-bearing kaolinite-rich clay bed found at all sampling sites resulted from fallout from a common source, and that excess Ir is associated primarily with fallout and not with chemical concentration of preexisting amounts in the local medium. Excess Sc, Ti, V, Cr, and possibly Hf appear also to have come with the fallout. The uniformity in thickness of the K-T kaolinitic clay bed over a distance of at least 1200 km indicates that the fallout material came from a common source at a considerable distance.
Gilmore James S.
Knight Jere D.
Orth Carl J.
Pillmore Charles L.
Tschudy Robert H.
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