Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America

Detalhes bibliográficos
Autor(a) principal: Aragão, Marcela [UNESP]
Data de Publicação: 2021
Outros Autores: Scardia, Giancarlo [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1093/gji/ggab011
http://hdl.handle.net/11449/206247
Resumo: Recent compilations of the Illawarra Reversals show remarkable differences in the onset age (265 Ma versus 269 Ma) and the magnetic polarity pattern, hampering the establishment of a reference geomagnetic timescale for the Middle-Late Permian. The Parana Basin hosts a 7-km-thick, discontinuous sedimentary succession spanning the Palaeozoic to the Mesozoic, including the Gondwana 1 supersequence which extends from Late Carboniferous to the Triassic or Jurassic. We provide the magnetostratigraphy of the middle and upper Permian part of this sequence of a ca. 300-m-long core, pertaining to the Passa Dois Group and the Piramboia Formation. Sample demagnetization of NRM revealed two magnetic overprints ascribed to the Brunhes chron and to the emplacement of Parana Large Igneous Province in the Early Cretaceous, respectively. Stable, dual polarity characteristic components (ChRM) were isolated at temperatures higher than 450 °C and interpreted as a primary detrital magnetic remanence (DRM), acquired during or soon after sediment deposition. Available U-Pb dating on volcanic zircons from the literature provided independent chronologic constraints for our magnetostratigraphy. A total of 8 reverse polarity intervals were identified, the lowermost of which (up to 110 m thick) correlates to the Kiaman Superchron. The overlying Illawarra is dominated by a reverse polarity magnetization with thin (4-5 m thick) normal polarity intervals. This pattern agrees with the Illawarra sequence from the Karoo Basin and other proposed timescales for the Permian. The onset of the Illawarra reversals is interpolated to ca. 270 Ma, close to the age of 269 Ma from the Karoo Basin. Combined magnetostratigraphy and geochronology yielded sediment accumulation rates of ca. 8 m Myr-1 for the Passa Dois Group in the northeastern (marginal) sector of the Parana Basin, indicating that Serra Alta and Teresina Formations span 279-274 Ma and 274-254 Ma, respectively.
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spelling Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South AmericaMagnetostratigraphyPalaeomagnetismSouth AmericaRecent compilations of the Illawarra Reversals show remarkable differences in the onset age (265 Ma versus 269 Ma) and the magnetic polarity pattern, hampering the establishment of a reference geomagnetic timescale for the Middle-Late Permian. The Parana Basin hosts a 7-km-thick, discontinuous sedimentary succession spanning the Palaeozoic to the Mesozoic, including the Gondwana 1 supersequence which extends from Late Carboniferous to the Triassic or Jurassic. We provide the magnetostratigraphy of the middle and upper Permian part of this sequence of a ca. 300-m-long core, pertaining to the Passa Dois Group and the Piramboia Formation. Sample demagnetization of NRM revealed two magnetic overprints ascribed to the Brunhes chron and to the emplacement of Parana Large Igneous Province in the Early Cretaceous, respectively. Stable, dual polarity characteristic components (ChRM) were isolated at temperatures higher than 450 °C and interpreted as a primary detrital magnetic remanence (DRM), acquired during or soon after sediment deposition. Available U-Pb dating on volcanic zircons from the literature provided independent chronologic constraints for our magnetostratigraphy. A total of 8 reverse polarity intervals were identified, the lowermost of which (up to 110 m thick) correlates to the Kiaman Superchron. The overlying Illawarra is dominated by a reverse polarity magnetization with thin (4-5 m thick) normal polarity intervals. This pattern agrees with the Illawarra sequence from the Karoo Basin and other proposed timescales for the Permian. The onset of the Illawarra reversals is interpolated to ca. 270 Ma, close to the age of 269 Ma from the Karoo Basin. Combined magnetostratigraphy and geochronology yielded sediment accumulation rates of ca. 8 m Myr-1 for the Passa Dois Group in the northeastern (marginal) sector of the Parana Basin, indicating that Serra Alta and Teresina Formations span 279-274 Ma and 274-254 Ma, respectively.Universidade Estadual Paulista (UNESP) Instituto de Geociências e Ciências ExatasUniversidade Estadual Paulista (UNESP) Instituto de Geociências e Ciências ExatasUniversidade Estadual Paulista (Unesp)Aragão, Marcela [UNESP]Scardia, Giancarlo [UNESP]2021-06-25T10:29:01Z2021-06-25T10:29:01Z2021-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article860-871http://dx.doi.org/10.1093/gji/ggab011Geophysical Journal International, v. 225, n. 2, p. 860-871, 2021.1365-246X0956-540Xhttp://hdl.handle.net/11449/20624710.1093/gji/ggab0112-s2.0-85104888647Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengGeophysical Journal Internationalinfo:eu-repo/semantics/openAccess2021-10-23T01:57:54Zoai:repositorio.unesp.br:11449/206247Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:23:50.228645Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America
title Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America
spellingShingle Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America
Aragão, Marcela [UNESP]
Magnetostratigraphy
Palaeomagnetism
South America
title_short Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America
title_full Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America
title_fullStr Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America
title_full_unstemmed Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America
title_sort Middle-Late Permian magnetostratigraphy and the onset of the Illawarra Reversals in the northeastern Parana Basin, South America
author Aragão, Marcela [UNESP]
author_facet Aragão, Marcela [UNESP]
Scardia, Giancarlo [UNESP]
author_role author
author2 Scardia, Giancarlo [UNESP]
author2_role author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Aragão, Marcela [UNESP]
Scardia, Giancarlo [UNESP]
dc.subject.por.fl_str_mv Magnetostratigraphy
Palaeomagnetism
South America
topic Magnetostratigraphy
Palaeomagnetism
South America
description Recent compilations of the Illawarra Reversals show remarkable differences in the onset age (265 Ma versus 269 Ma) and the magnetic polarity pattern, hampering the establishment of a reference geomagnetic timescale for the Middle-Late Permian. The Parana Basin hosts a 7-km-thick, discontinuous sedimentary succession spanning the Palaeozoic to the Mesozoic, including the Gondwana 1 supersequence which extends from Late Carboniferous to the Triassic or Jurassic. We provide the magnetostratigraphy of the middle and upper Permian part of this sequence of a ca. 300-m-long core, pertaining to the Passa Dois Group and the Piramboia Formation. Sample demagnetization of NRM revealed two magnetic overprints ascribed to the Brunhes chron and to the emplacement of Parana Large Igneous Province in the Early Cretaceous, respectively. Stable, dual polarity characteristic components (ChRM) were isolated at temperatures higher than 450 °C and interpreted as a primary detrital magnetic remanence (DRM), acquired during or soon after sediment deposition. Available U-Pb dating on volcanic zircons from the literature provided independent chronologic constraints for our magnetostratigraphy. A total of 8 reverse polarity intervals were identified, the lowermost of which (up to 110 m thick) correlates to the Kiaman Superchron. The overlying Illawarra is dominated by a reverse polarity magnetization with thin (4-5 m thick) normal polarity intervals. This pattern agrees with the Illawarra sequence from the Karoo Basin and other proposed timescales for the Permian. The onset of the Illawarra reversals is interpolated to ca. 270 Ma, close to the age of 269 Ma from the Karoo Basin. Combined magnetostratigraphy and geochronology yielded sediment accumulation rates of ca. 8 m Myr-1 for the Passa Dois Group in the northeastern (marginal) sector of the Parana Basin, indicating that Serra Alta and Teresina Formations span 279-274 Ma and 274-254 Ma, respectively.
publishDate 2021
dc.date.none.fl_str_mv 2021-06-25T10:29:01Z
2021-06-25T10:29:01Z
2021-05-01
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 http://dx.doi.org/10.1093/gji/ggab011
Geophysical Journal International, v. 225, n. 2, p. 860-871, 2021.
1365-246X
0956-540X
http://hdl.handle.net/11449/206247
10.1093/gji/ggab011
2-s2.0-85104888647
url http://dx.doi.org/10.1093/gji/ggab011
http://hdl.handle.net/11449/206247
identifier_str_mv Geophysical Journal International, v. 225, n. 2, p. 860-871, 2021.
1365-246X
0956-540X
10.1093/gji/ggab011
2-s2.0-85104888647
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Geophysical Journal International
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 860-871
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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