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Sediments from Lake Cheko (Siberia), a possible impact crater for the 1908 Tunguska Event
- 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.
- Subjects :
- LAKE CHEKO
Palynology
SIBERIA
carbon
Event (relativity)
TUNGUSKA EVENT
Sediment
grain-size
porosity
magnetic susceptibility
X-ray diffraction mineralogy
organic C and N content
d13C isotopic ratios
palynology
and radiometric (210Pb and 137Cs) age determinations
Geology
IMPACT CRATER
Sequence (geology)
Paleontology
Impact crater
cosmic body
Epicenter
Aquatic plant
peat
Lacustrine deposits
explosion
Subjects
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