Material traces of the Tungusk bolide

Details Material traces of the Tungusk bolide Material traces of the Tungusk bolide

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990geokh......627n&link_type=abstract

Geokhimiia (ISSN 0016-7525), May 1990, p. 627-639. In Russian.

Computer Science

Magnetic Materials, Meteoritic Composition, Peat, Silicates, Stratigraphy, Tungusk Meteorite, Comets, Cosmic Dust, Iridium, Microanalysis, Minerals

Scientific paper

This paper presents data from detailed chemical analyses of silicate particles and magnetic spherules picked up at the area of the Tungusk event, with special consideration given to the distribution of iridium in peat layers which included the layer formed in 1908. Results suggest that, for the most part, the mineral particles isolated from peat and soils of the Tungusk-event region could be of industrial origin, with the positively identified cosmic particles constituting not more than 12 to 15 percent in the 0.1 to 0.14 mm size magnetic-spherule pool. An iridium anomaly was found in the 1908-yr peat layer, indicating the presence of cosmic matter. The observed contents of Ir are compatible with a cometary origin of the Tungusk event, indicating that this event was accompanied by a global fallout of cosmic matter.

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