Indications of a cosmochemical anomaly in the region of the 1908 Tunguska catastrophe. II - Investigation of the chemical composition of silicate microspherules

Details Indications of a cosmochemical anomaly in the region of the 1908 Tunguska catastrophe. II - Investigation of the chemical composition of silicate microspherules Indications of a cosmochemical anomaly in the region of the 1908 Tunguska catastrophe. II - Investigation of the chemical composition of silicate microspherules

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978avest..11..209k&link_type=abstract

(Astronomicheskii Vestnik, vol. 11, Oct.-Dec. 1977, p. 209-218.) Solar System Research, vol. 11, no. 4, Apr. 1978, p. 171-178. T

Astronomy and Astrophysics

Astronomy

Extraterrestrial Matter, Geochemistry, Meteoritic Damage, Silicates, Tungusk Meteorite, Abundance, Aluminum, Anomalies, Chemical Composition, Cobalt, Density (Mass/Volume), Iron, Neutron Activation Analysis, Particle Size Distribution, Sodium, Spherules, Tektites

Scientific paper

Neutron activation analysis is used to study the composition of silicate microspherules extracted from a peat stratum that includes material from the Tunguska event of 1908. Contents or upper limits are determined for 11 elements. The results show that the microspherules could not have been formed during remelting and differentiation of terrestrial (traprock) or ordinary meteoritic material and that the microspherules most closely resemble tektites in their chemical composition and specific gravity. In general, the composition of the microspherules is found to correlate with the composition of the element anomaly previously observed in peats from the explosion epicenter. It is concluded that the microspherules most probably were produced during high-temperature differentiation of material from the Tunguska object at the time of the explosion.

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