Back to Search Start Over

Sediments from Lake Cheko (Siberia), a possible impact crater for the 1908 Tunguska Event

Authors :
Luisa Forlani
G. Longo
Enrico Bonatti
Francesca Alvisi
Alina Polonia
Mariangela Ravaioli
S. Albertazzi
Carla Alberta Accorsi
Luca Gasperini
Fabio Sacchetti
L.Gasperini
E.Bonatti
S.Albertazzi
L.Forlani
C.A.Accorsi
G.Longo
M.Ravaioli
F.Alvisi
A.Polonia
F.Sacchetti
Source :
TERRA nova, 21(6) (2009): 489–494. doi:10.1111/j.1365-3121.2009.00906.x, info:cnr-pdr/source/autori:Gasperini L. (1), Bonatti E. (1), Albertazzi S. (1), Forlani L. (2), Accorsi C. (3), Longo G. (4), Ravaioli M. (1), Alvisi F. (1), Polonia A. (1), Sacchetti F. (1)/titolo:Sediments from Lake Cheko (Siberia), a possible impact crater for the 1908 Tunguska Event/doi:10.1111%2Fj.1365-3121.2009.00906.x/rivista:TERRA nova (Print)/anno:2009/pagina_da:489/pagina_a:494/intervallo_pagine:489–494/volume:21(6)
Publication Year :
2009
Publisher :
Wiley, 2009.

Abstract

Cheko, a small lake located in Siberia close to the epicentre of the 1908 Tunguska explosion, might fill a crater left by the impact of a fragment of a Cosmic Body. Sediment cores from the lake's bottom were studied to support or reject this hypothesis. A 175-cm long core, collected near the center of the lake, consists of an upper similar to 1 m thick sequence of lacustrine deposits overlaying coarser chaotic material. 210Pb and 137Cs indicate that the transition from lower to upper sequence occurred close to the time of the Tunguska Event. Pollen analysis reveals that remains of aquatic plants are abundant in the top post-1908 sequence, but are absent in the lower pre-1908 portion of the core. These results, including organic C, N and delta 13C data, suggest that Lake Cheko formed at the time of the Tunguska Event.

Details

ISSN :
13653121 and 09544879
Volume :
21
Database :
OpenAIRE
Journal :
Terra Nova
Accession number :
edsair.doi.dedup.....1ec1c649afd4f3fa5082f07974f46a08
Full Text :
https://doi.org/10.1111/j.1365-3121.2009.00906.x