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

International audience 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 Pol...

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Bibliographic Details
Main Authors: Rocchia, Robert, Bonté, Philippe, Jéhanno, Célestine, Robin, Eric, de Angelis, Martine, Boclet, Daniel
Other Authors: Centre des Faibles Radioactivités, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etude de Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
Format: Book Part
Language:English
Published: HAL CCSD 1990
Subjects:
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
Antarctic
The Antarctic
South Pole
Tunguska
Antarc*
Antarctica
South pole
Online Access:https://hal.science/hal-03582517
https://doi.org/10.1130/SPE247-p189
Description
Summary:International audience 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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