Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.

Detalhes bibliográficos
Autor(a) principal: Tohver, Eric
Data de Publicação: 2013
Outros Autores: Cawood, Peter Anthony, Riccomini, Claudio, Lana, Cristiano de Carvalho, Trindade, Ricardo Ivan Ferreira da
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFOP
dARK ID: ark:/61566/001300000cbvf
Texto Completo: http://www.repositorio.ufop.br/handle/123456789/3885
https://doi.org/10.1016/j.palaeo.2013.07.010
Resumo: The Late Permian and Early Triassic periods are marked by large fluctuations in the carbon isotope record, but the source(s) of the disturbance to the global carbon cycle and the link to the end-Permian mass extinction arewidely debated. This contribution explores the possible isotopic effects of an impact event into the hydrocarbon-rich rocks of the Paraná–Karoo Basin. Recent U–Pb and 40Ar/39Ar dating of the 40 km Araguainha impact structure of central Brazil reveals an age of 254.7 ± 2.5 Ma (2σ error) for this event. The calculated energy (10^5–10^6 MT of TNT equivalent) released by this impact is less than threshold values of 10^7–10^8 MT TNT equivalent for global mass extinctions. Thus, the Araguainha crater is unlikely to have been the cause of the end-Permian biotic crisis. However, the combined seismic effects from the impact itself and the post-impact collapse of the 20–25 km diameter transient crater to its present 40 km diameter would result in large magnitude earthquakes (Mw 9.3–10.5) and tsunamis in the shallow marine Paraná–Karoo Basin. Slope failure and sediment liquefaction are predicted to have occurredwithin a 700–3000 km radius of the crater, causing large-scale release of methane from organic-rich sediments of this basin, including the oil shale horizons of the Iratí Formation. New geological evidence for seismicity in the Paraná Basin at the time of impact is presented, together with a compilation of existing carbon isotope data from the Paraná Basin, which demonstrate a widespread pattern of disturbance consistent with the release of methane. These two datasets suggest that both seismicity and methane release took place within ca.1000 km of the impact site, with mass balance calculations suggesting ca. 1600 GT of methane were released into the atmosphere at this time. Methane release at this scale would have significant climate effects and would contribute to a sharp (<1 ka) negative shift in δ^13 C values at the time of the impact, which should be distinguishable from the more gradual shift over 0.5–1 Ma caused by contemporaneous intrusion of the Siberian traps.
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spelling Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.Permian–Triassic mass extinctionImpact eventCarbon isotope excursionSeismicityMethaneThe Late Permian and Early Triassic periods are marked by large fluctuations in the carbon isotope record, but the source(s) of the disturbance to the global carbon cycle and the link to the end-Permian mass extinction arewidely debated. This contribution explores the possible isotopic effects of an impact event into the hydrocarbon-rich rocks of the Paraná–Karoo Basin. Recent U–Pb and 40Ar/39Ar dating of the 40 km Araguainha impact structure of central Brazil reveals an age of 254.7 ± 2.5 Ma (2σ error) for this event. The calculated energy (10^5–10^6 MT of TNT equivalent) released by this impact is less than threshold values of 10^7–10^8 MT TNT equivalent for global mass extinctions. Thus, the Araguainha crater is unlikely to have been the cause of the end-Permian biotic crisis. However, the combined seismic effects from the impact itself and the post-impact collapse of the 20–25 km diameter transient crater to its present 40 km diameter would result in large magnitude earthquakes (Mw 9.3–10.5) and tsunamis in the shallow marine Paraná–Karoo Basin. Slope failure and sediment liquefaction are predicted to have occurredwithin a 700–3000 km radius of the crater, causing large-scale release of methane from organic-rich sediments of this basin, including the oil shale horizons of the Iratí Formation. New geological evidence for seismicity in the Paraná Basin at the time of impact is presented, together with a compilation of existing carbon isotope data from the Paraná Basin, which demonstrate a widespread pattern of disturbance consistent with the release of methane. These two datasets suggest that both seismicity and methane release took place within ca.1000 km of the impact site, with mass balance calculations suggesting ca. 1600 GT of methane were released into the atmosphere at this time. Methane release at this scale would have significant climate effects and would contribute to a sharp (<1 ka) negative shift in δ^13 C values at the time of the impact, which should be distinguishable from the more gradual shift over 0.5–1 Ma caused by contemporaneous intrusion of the Siberian traps.2014-11-14T20:31:12Z2014-11-14T20:31:12Z2013info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfTOHVER, E. et al. Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 381, p. 0001, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0031018213003313>. Acesso em: 04 set. 2014.0031-0182http://www.repositorio.ufop.br/handle/123456789/3885https://doi.org/10.1016/j.palaeo.2013.07.010ark:/61566/001300000cbvfO periódico Palaeogeography, Palaeoclimatology, Palaeoecology concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3466020705103.info:eu-repo/semantics/openAccessTohver, EricCawood, Peter AnthonyRiccomini, ClaudioLana, Cristiano de CarvalhoTrindade, Ricardo Ivan Ferreira daengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOP2024-11-10T23:37:20Zoai:repositorio.ufop.br:123456789/3885Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332024-11-10T23:37:20Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false
dc.title.none.fl_str_mv Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.
title Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.
spellingShingle Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.
Tohver, Eric
Permian–Triassic mass extinction
Impact event
Carbon isotope excursion
Seismicity
Methane
title_short Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.
title_full Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.
title_fullStr Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.
title_full_unstemmed Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.
title_sort Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record.
author Tohver, Eric
author_facet Tohver, Eric
Cawood, Peter Anthony
Riccomini, Claudio
Lana, Cristiano de Carvalho
Trindade, Ricardo Ivan Ferreira da
author_role author
author2 Cawood, Peter Anthony
Riccomini, Claudio
Lana, Cristiano de Carvalho
Trindade, Ricardo Ivan Ferreira da
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Tohver, Eric
Cawood, Peter Anthony
Riccomini, Claudio
Lana, Cristiano de Carvalho
Trindade, Ricardo Ivan Ferreira da
dc.subject.por.fl_str_mv Permian–Triassic mass extinction
Impact event
Carbon isotope excursion
Seismicity
Methane
topic Permian–Triassic mass extinction
Impact event
Carbon isotope excursion
Seismicity
Methane
description The Late Permian and Early Triassic periods are marked by large fluctuations in the carbon isotope record, but the source(s) of the disturbance to the global carbon cycle and the link to the end-Permian mass extinction arewidely debated. This contribution explores the possible isotopic effects of an impact event into the hydrocarbon-rich rocks of the Paraná–Karoo Basin. Recent U–Pb and 40Ar/39Ar dating of the 40 km Araguainha impact structure of central Brazil reveals an age of 254.7 ± 2.5 Ma (2σ error) for this event. The calculated energy (10^5–10^6 MT of TNT equivalent) released by this impact is less than threshold values of 10^7–10^8 MT TNT equivalent for global mass extinctions. Thus, the Araguainha crater is unlikely to have been the cause of the end-Permian biotic crisis. However, the combined seismic effects from the impact itself and the post-impact collapse of the 20–25 km diameter transient crater to its present 40 km diameter would result in large magnitude earthquakes (Mw 9.3–10.5) and tsunamis in the shallow marine Paraná–Karoo Basin. Slope failure and sediment liquefaction are predicted to have occurredwithin a 700–3000 km radius of the crater, causing large-scale release of methane from organic-rich sediments of this basin, including the oil shale horizons of the Iratí Formation. New geological evidence for seismicity in the Paraná Basin at the time of impact is presented, together with a compilation of existing carbon isotope data from the Paraná Basin, which demonstrate a widespread pattern of disturbance consistent with the release of methane. These two datasets suggest that both seismicity and methane release took place within ca.1000 km of the impact site, with mass balance calculations suggesting ca. 1600 GT of methane were released into the atmosphere at this time. Methane release at this scale would have significant climate effects and would contribute to a sharp (<1 ka) negative shift in δ^13 C values at the time of the impact, which should be distinguishable from the more gradual shift over 0.5–1 Ma caused by contemporaneous intrusion of the Siberian traps.
publishDate 2013
dc.date.none.fl_str_mv 2013
2014-11-14T20:31:12Z
2014-11-14T20:31:12Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv TOHVER, E. et al. Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 381, p. 0001, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0031018213003313>. Acesso em: 04 set. 2014.
0031-0182
http://www.repositorio.ufop.br/handle/123456789/3885
https://doi.org/10.1016/j.palaeo.2013.07.010
dc.identifier.dark.fl_str_mv ark:/61566/001300000cbvf
identifier_str_mv TOHVER, E. et al. Shaking a methane fizz : seismicity from the Araguainha impact event and the Permian–Triassic global carbon isotope record. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 381, p. 0001, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0031018213003313>. Acesso em: 04 set. 2014.
0031-0182
ark:/61566/001300000cbvf
url http://www.repositorio.ufop.br/handle/123456789/3885
https://doi.org/10.1016/j.palaeo.2013.07.010
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language eng
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instname:Universidade Federal de Ouro Preto (UFOP)
instacron:UFOP
instname_str Universidade Federal de Ouro Preto (UFOP)
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institution UFOP
reponame_str Repositório Institucional da UFOP
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repository.name.fl_str_mv Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)
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