A multitracer study on peat profiles from Tunguska, Siberia
Two peat columns from Tunguska (Siberia) were analysed for pollen, spores, charcoal, trace elements and g-emitters in order to identify the fingerprints of the impact of a still unidentified cosmic body (TCB), which occurred in the summer of 1908, and the level of environmental pollution in a backgr...
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Online Access: | http://hdl.handle.net/11585/11050 https://doi.org/10.1016/j.gloplacha.2006.03.010 |
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ftunibolognairis:oai:cris.unibo.it:11585/11050 2024-02-04T10:04:55+01:00 A multitracer study on peat profiles from Tunguska, Siberia TOSITTI, LAURA SANDRINI, SILVIA FORLANI, LUISA M. Mingozzi M. C. Buoso M. De Poli D. Ceccato D. Zafiropoulos L. Tositti M. Mingozzi S. Sandrini L. Forlani M.C. Buoso M. De Poli D. Ceccato D.Zafiropoulos 2006 ELETTRONICO http://hdl.handle.net/11585/11050 https://doi.org/10.1016/j.gloplacha.2006.03.010 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000241505700008 volume:53 firstpage:278 lastpage:289 numberofpages:12 journal:GLOBAL AND PLANETARY CHANGE http://hdl.handle.net/11585/11050 doi:10.1016/j.gloplacha.2006.03.010 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33748616533 PEAT BOGS TUNGUSKA PIXE 210PB DATING info:eu-repo/semantics/article 2006 ftunibolognairis https://doi.org/10.1016/j.gloplacha.2006.03.010 2024-01-10T17:53:49Z Two peat columns from Tunguska (Siberia) were analysed for pollen, spores, charcoal, trace elements and g-emitters in order to identify the fingerprints of the impact of a still unidentified cosmic body (TCB), which occurred in the summer of 1908, and the level of environmental pollution in a background area of central Siberia. Peat layers were subject to non-destructive g-ray spectrometry to derive radiochronology by the excess 210Pb method. The age-to-depth relationship was crosschecked by using both 1963 horizon of 137Cs associated to maximum global fallout deposition and palynological data profiles. Vertical distributions of trace elements in the peat columns were obtained by PIXE multielemental analysis allowing determination of the levels of environmental contamination in a background region of the Siberian taiga. The association of heavy metals such as Ni, Co and Cu in the profiles suggests the connection of the area with mining and metal smelting activity in the north of the region through atmospheric circulation. As concerns global scale contamination, the inventory of the artificial radionuclide 137Cs (4.6 kBq m-2) shows a value typical of remote slightly contaminated areas resulting from global scale redistribution of radioactive fallout from Cold War nuclear weapon testing. The atmospheric inventory of the natural radionuclide 210Pb, for which a mean annual flux of 200 Bq m-2 yr-1 has been calculated, is typical of continental regions. The influence of Tunguska Cosmic Body in the peat is recognizable by a large discontinuity in the palynological profile of the peat monolith at a depth coinciding with the 1908 layer as determined by the 210Pb technique, showing a large peak of total pollen counting attributed to the impact of the shockwave on the area in which huge tree stands were destroyed. Following the event, tree pollens concentration decreases abruptly showing the temporary inception of a mire environment with an increase of Sphagnum spore concentrations. Results of elemental analysis so far ... Article in Journal/Newspaper taiga Siberia IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Tunguska ENVELOPE(144.784,144.784,59.388,59.388) Monolith ENVELOPE(163.283,163.283,-66.950,-66.950) Global and Planetary Change 53 4 278 289 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
PEAT BOGS TUNGUSKA PIXE 210PB DATING |
spellingShingle |
PEAT BOGS TUNGUSKA PIXE 210PB DATING TOSITTI, LAURA SANDRINI, SILVIA FORLANI, LUISA M. Mingozzi M. C. Buoso M. De Poli D. Ceccato D. Zafiropoulos A multitracer study on peat profiles from Tunguska, Siberia |
topic_facet |
PEAT BOGS TUNGUSKA PIXE 210PB DATING |
description |
Two peat columns from Tunguska (Siberia) were analysed for pollen, spores, charcoal, trace elements and g-emitters in order to identify the fingerprints of the impact of a still unidentified cosmic body (TCB), which occurred in the summer of 1908, and the level of environmental pollution in a background area of central Siberia. Peat layers were subject to non-destructive g-ray spectrometry to derive radiochronology by the excess 210Pb method. The age-to-depth relationship was crosschecked by using both 1963 horizon of 137Cs associated to maximum global fallout deposition and palynological data profiles. Vertical distributions of trace elements in the peat columns were obtained by PIXE multielemental analysis allowing determination of the levels of environmental contamination in a background region of the Siberian taiga. The association of heavy metals such as Ni, Co and Cu in the profiles suggests the connection of the area with mining and metal smelting activity in the north of the region through atmospheric circulation. As concerns global scale contamination, the inventory of the artificial radionuclide 137Cs (4.6 kBq m-2) shows a value typical of remote slightly contaminated areas resulting from global scale redistribution of radioactive fallout from Cold War nuclear weapon testing. The atmospheric inventory of the natural radionuclide 210Pb, for which a mean annual flux of 200 Bq m-2 yr-1 has been calculated, is typical of continental regions. The influence of Tunguska Cosmic Body in the peat is recognizable by a large discontinuity in the palynological profile of the peat monolith at a depth coinciding with the 1908 layer as determined by the 210Pb technique, showing a large peak of total pollen counting attributed to the impact of the shockwave on the area in which huge tree stands were destroyed. Following the event, tree pollens concentration decreases abruptly showing the temporary inception of a mire environment with an increase of Sphagnum spore concentrations. Results of elemental analysis so far ... |
author2 |
L. Tositti M. Mingozzi S. Sandrini L. Forlani M.C. Buoso M. De Poli D. Ceccato D.Zafiropoulos |
format |
Article in Journal/Newspaper |
author |
TOSITTI, LAURA SANDRINI, SILVIA FORLANI, LUISA M. Mingozzi M. C. Buoso M. De Poli D. Ceccato D. Zafiropoulos |
author_facet |
TOSITTI, LAURA SANDRINI, SILVIA FORLANI, LUISA M. Mingozzi M. C. Buoso M. De Poli D. Ceccato D. Zafiropoulos |
author_sort |
TOSITTI, LAURA |
title |
A multitracer study on peat profiles from Tunguska, Siberia |
title_short |
A multitracer study on peat profiles from Tunguska, Siberia |
title_full |
A multitracer study on peat profiles from Tunguska, Siberia |
title_fullStr |
A multitracer study on peat profiles from Tunguska, Siberia |
title_full_unstemmed |
A multitracer study on peat profiles from Tunguska, Siberia |
title_sort |
multitracer study on peat profiles from tunguska, siberia |
publishDate |
2006 |
url |
http://hdl.handle.net/11585/11050 https://doi.org/10.1016/j.gloplacha.2006.03.010 |
long_lat |
ENVELOPE(144.784,144.784,59.388,59.388) ENVELOPE(163.283,163.283,-66.950,-66.950) |
geographic |
Tunguska Monolith |
geographic_facet |
Tunguska Monolith |
genre |
taiga Siberia |
genre_facet |
taiga Siberia |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000241505700008 volume:53 firstpage:278 lastpage:289 numberofpages:12 journal:GLOBAL AND PLANETARY CHANGE http://hdl.handle.net/11585/11050 doi:10.1016/j.gloplacha.2006.03.010 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33748616533 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2006.03.010 |
container_title |
Global and Planetary Change |
container_volume |
53 |
container_issue |
4 |
container_start_page |
278 |
op_container_end_page |
289 |
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1789973718968041472 |