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Cecchini S., Galli M., Giovannini G., Longo G., Pagliarin A., Real-Time Monitoring of Environmental Radiation in Tunguska (Siberia)
OL’KHOVATOV A.YU., GEOPHYSICAL CIRCUMSTANCES OF THE 1908 TUNGUSKA EVENT IN SIBERIA, RUSSIA
Longo G. and Di Martino M., Recalculation of the Tunguska Cosmic Body Parameters on the Basis of the 1938 and 1999 Aerophotosurveys
Giuseppe Longo and Mario Di Martino, Remote Sensing Investigation of the Tunguska Explosion Area
Evgeniy M. Kolesnikov, Giuseppe Longo, Tatjana Boettger, Natal'ya V. Kolesnikova, Paola Gioacchini, Luisa Forlani, Roberto Giampieri and Romano Serra: Isotopic-geochemical study of nitrogen and carbon in peat from the Tunguska
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Evgeniy M. Kolesnikov, Giuseppe Longo, Tatjana Boettger, Natal'ya V. Kolesnikova, Paola Gioacchini, Luisa Forlani, Roberto Giampieri and Romano Serra: Isotopic-geochemical study of nitrogen and carbon in peat from the Tunguska Cosmic Body explosion site. Icarus 161, n. 2, pp. 235-243 (April 2003)
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Тунгусский феномен » Исследования » Библиография » 2000-09 » 2003 » Evgeniy M. Kolesnikov, Giuseppe Longo, Tatjana Boettger, Natal'ya V. Kolesnikova, Paola Gioacchini, Luisa Forlani, Roberto Giampieri and Romano Serra: Isotopic-geochemical study of nitrogen and carbon in peat from the Tunguska

Abstract

Isotopic– geochemical investigations were carried out on peat samples from the 1908 Tunguska Cosmic Body (TCB) explosion area. We analyzed two peat columns from the Northern peat bog, sampled in 1998, and from the Raketka peat bog, sampled during the 1999 Italian expedition, both located near the epicenter of the TCB explosion area. At the depth of the “catastrophic” layer, formed in 1908, and deeper, one can observe shifts in the isotopic composition of nitrogen (up to 15N=+7.2‰) and carbon (up to 13C=+2‰) and also an increase in the nitrogen concentration compared to those in the normal, upper layers, unaffected by the Tunguska event. One possible explanation for these effects could be the presence of nitrogen and carbon from TCB material and from acid rains, following the TCB explosion, in the “catastrophic” and “precatastrophic” layers of peat. We found that the highest quantity of isotopically heavy nitrogen fell near the explosion epicenter and along the TCB trajectory. It is calculated that 200,000 tons of nitrogen fell over the area of devastated forest, i.e., only about 30% of the value calculated by Rasmussen et al. (1984). This discrepancy is probably caused by part of the nitrogen having dispersed in the Earth’s atmosphere. The isotopic effects observed in the peat agree with the results of previous investigations (Kolesnikov et al., 1998a, 1998b, 1999; Rasmussen et al., 1999) and also with the increased content of iridium and other platinoids found in the corresponding peat layers of other columns (Hou et al., 1998, 2000). These data favor the hypothesis of a cosmochemical origin of the isotopic effects.

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