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Chapitre D'ouvrage Année : 1990

Search for the Tunguska event relics in the Antarctic snow and new estimation of the cosmic iridium accretion rate

Résumé

A careful search for iridium in snow-ice samples deposited in Antarctica by the time of the great Tunguska explosion in 1908 has produced negative results. The worldwide dispersion of the cosmic bolide responsible for the event has not left a detectable Ir inprint in South Pole snow. The iridium infall from the Tunguska event is at least a factor of 20 lower than previously estimated. The local iridium background, averaged over a period of 30 years, is consistent with a global micrometeorite flux of about 10 Gg per year.
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Dates et versions

hal-03582517 , version 1 (21-02-2022)

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Robert Rocchia, Philippe Bonté, Célestine Jéhanno, Eric Robin, Martine de Angelis, et al.. Search for the Tunguska event relics in the Antarctic snow and new estimation of the cosmic iridium accretion rate. Global Catastrophes in Earth History; An Interdisciplinary Conference on Impacts, Volcanism, and Mass Mortality, 247, Geological Society of America, pp.189-194, 1990, Geological Society of America Special Papers, ⟨10.1130/SPE247-p189⟩. ⟨hal-03582517⟩
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