Other
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1133w&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, April 1990, p. 1133-1146.
Other
2
Abundance, Carbon, Clays, Cretaceous-Tertiary Boundary, Fires, Infrared Spectra, Chromium Oxides, Iridium, Soot, U.S.S.R.
Scientific paper
Results are reported on carbon analysis and on C and Ir correlations in samples from the marine K-T boundary site SM-4 at the Sumbar River in Turkmenia (USSR), which has the largest known Ir anomaly (580 ng/cq cm). In addition, the boundary clay is thick, and is undisturbed by bioturbation. Kerogen and delta-C-13 elemental carbon in the boundary clay were resolved using a Cr2O7(2-) oxidation method of Wolbach and Anders (1989). It was found that Ir and shocked quartz, both representing impact ejecta, rise sharply at the boundary, peak in the basal layer, and then decline. On the other hand, soot and total elemental C show a similar spike in the basal layer but then rise rather than fall, peking at 7 cm. Results indicate that fires at the SM-4 K-T boundary site started before the basal layer had settled, implying that ignition and spreading of major fires became possible at the time of or very soon after the meteorite impact.
Anders Edward
Nazarov Michael A.
Wolbach Wendy S.
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