The Tunguska explosion of 1908 - Discovery of meteoritic debris near the explosion site and at the South Pole

Details The Tunguska explosion of 1908 - Discovery of meteoritic debris near the explosion site and at the South Pole The Tunguska explosion of 1908 - Discovery of meteoritic debris near the explosion site and at the South Pole

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...220.1158g&link_type=abstract

Science (ISSN 0036-8075), vol. 220, June 10, 1983, p. 1158-1161.

Computer Science

40

Meteoritic Composition, Tungusk Meteorite, Abundance, Chemical Composition, Debris, Iridium, Nickel, Siberia, Stony Meteorites, Trace Elements

Scientific paper

Noble-metal-abundance measurements of submillimeter-size metallic spheres from the vicinity of the 1908 Tunguska explosion, of ablation spheres separated from mid-Pacific sediment, and of Antarctic-ice-core samples are presented and analyzed. High-sensitivity neutron-activation studies of Ni, Co, Ir, Au, Cr, Sb, and Fe in the Tunguska spheres verify their extraterrestrial origin; comparison of their Ni/Ir ratios with those of mid-Pacific ablation spheres shows that the Tunguska spheres were indeed deposited by the explosion and not by steady-state meteorite ablation. Ir-192-gamma-radiation determinations on Antarctic ice cores indicate a sudden influx of Ir (above the steady-state cosmic influx) at a depth corresponding to 1912 + or - 4 years. It is inferred that this Ir-rich debris was deposited by stratospheric fallout from the Tunguska explosion, that approximately 7 million tons of such debris fell worldwide, and that the Tunguska object, probably a stony meteorite, had a diameter of at least 160 m. The steady-state influx of cosmic matter is estimated at 1.8 x 10 to the -8th g/sq cm year at the South Pole, corresponding to a global influx of 400,000 tons/year.

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