Meteorite impact as a possible source of soot in the cretaceous-tertiary boundary layer

Details Meteorite impact as a possible source of soot in the cretaceous-tertiary boundary layer Meteorite impact as a possible source of soot in the cretaceous-tertiary boundary layer

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8720148s&link_type=abstract

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Carbon, Iridium, Meteorite Collisions, Planetary Boundary Layer, Soot, Combustion Products, Earth Surface, Impact Loads

Scientific paper

There is some evidence that a large meteorite may have collided with the Earth 65 m.y. ago and deposited a worldwide layer of iridium and other meteorite elements. It is suggested that this event is associated with the mass extinctions that occurred at that time. A recent paper now suggests that in addition to a layer of meteorite and crustal dust, a layer of elemental carbon was deposited worldwide. The mean carbon abundance at the Cretaceous-Tertiary (C-T) boundary was reported to be 0.021 g/cm(2), and most of it shows the characteristic morphology of carbon deposited from flames, such as soot or carbon black. However, this conclusion rests on only a few data points. Of the three sites reported, the background level of soot is given at only one. More data needs to be collected before far-reaching conclusions are drawn. To confidently identify the source of the excess C-T carbon (if indeed it turns out to be a worldwide phenomenon) may require considerable analysis. To identify the research that would have to be done, an attempt is made to narrow the range of possible sources for the soot using simple calculations and relying on the limited amount of analysis previously performed.

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