Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.sedgeo.2015.06.012 http://hdl.handle.net/11449/160747 |
Resumo: | The Parana Basin is a key locality in the context of the Late Paleozoic Ice Age (LPIA) because of its location east of the Andean proto-margin of Gondwana and west of contiguous interior basins today found in western Africa. In this paper we document the sedimentary record associated with an ice margin that reached the eastern border of the Parana Basin during the Pennsylvanian, with the aim of interpreting the depositional environments and discussing paleogeographic implications. The examined stratigraphic succession is divided in four stacked fades associations that record an upward transition from subglacial to glaciomarine environments. Deposition took place during deglaciation but was punctuated by minor readvances of the ice margin that deformed the sediment pile. Tillites, well-preserved landforms of subglacial erosion and glaciotectonic deformational structures indicate that the ice flowed to the north and northwest and that the ice margin did not advance far throughout the basin during the glacial maximum. Consequently, time-equivalent glacial deposits that crop out in other localities of eastern Parana Basin are better explained by assuming multiple smaller ice lobes instead of one single large glacier. These ice lobes flowed from an ice cap covering uplifted lands now located in western Namibia, where glacial deposits are younger and occur confined within paleovalleys cut onto the Precambrian basement. This conclusion corroborates the idea of a topographically-controlled ice-spreading center in southwestern Africa and does not support the view of a large polar ice sheet controlling deposition in the Parana Basin during the LPIA. (C) 2015 Published by Elsevier B.V. |
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Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern BrazilLate Paleozoic Ice AgeGlacial recordIce marginalDeglaciationItarare GroupThe Parana Basin is a key locality in the context of the Late Paleozoic Ice Age (LPIA) because of its location east of the Andean proto-margin of Gondwana and west of contiguous interior basins today found in western Africa. In this paper we document the sedimentary record associated with an ice margin that reached the eastern border of the Parana Basin during the Pennsylvanian, with the aim of interpreting the depositional environments and discussing paleogeographic implications. The examined stratigraphic succession is divided in four stacked fades associations that record an upward transition from subglacial to glaciomarine environments. Deposition took place during deglaciation but was punctuated by minor readvances of the ice margin that deformed the sediment pile. Tillites, well-preserved landforms of subglacial erosion and glaciotectonic deformational structures indicate that the ice flowed to the north and northwest and that the ice margin did not advance far throughout the basin during the glacial maximum. Consequently, time-equivalent glacial deposits that crop out in other localities of eastern Parana Basin are better explained by assuming multiple smaller ice lobes instead of one single large glacier. These ice lobes flowed from an ice cap covering uplifted lands now located in western Namibia, where glacial deposits are younger and occur confined within paleovalleys cut onto the Precambrian basement. This conclusion corroborates the idea of a topographically-controlled ice-spreading center in southwestern Africa and does not support the view of a large polar ice sheet controlling deposition in the Parana Basin during the LPIA. (C) 2015 Published by Elsevier B.V.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Univ Fed Parana, Dept Geol, BR-81531980 Curitiba, Parana, BrazilUniv Estadual Paulista, Dept Geol Aplicada, BR-13506900 Rio Claro, SP, BrazilUniv Fed Rio Grande do Sul, Inst Geociencias, Dept Paleontol & Estratig, BR-91501970 Porto Alegre, RS, BrazilUniv Estadual Paulista, Dept Geol Aplicada, BR-13506900 Rio Claro, SP, BrazilCNPq: 305108/2009-3CNPq: 401769/2010-0CNPq: 461650/2014-2CNPq: 461628/2014-7FAPESP: 98/02183-3Elsevier B.V.Univ Fed ParanaUniversidade Estadual Paulista (Unesp)Univ Fed Rio Grande do SulVesely, Fernando F.Trzaskos, BarbaraKipper, FelipeAssine, Mario Luis [UNESP]Souza, Paulo A.2018-11-26T16:16:33Z2018-11-26T16:16:33Z2015-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article45-63application/pdfhttp://dx.doi.org/10.1016/j.sedgeo.2015.06.012Sedimentary Geology. Amsterdam: Elsevier Science Bv, v. 326, p. 45-63, 2015.0037-0738http://hdl.handle.net/11449/16074710.1016/j.sedgeo.2015.06.012WOS:000360252500004WOS000360252500004.pdf04711021336581280471102133658128Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengSedimentary Geology1,277info:eu-repo/semantics/openAccess2023-12-04T06:13:28Zoai:repositorio.unesp.br:11449/160747Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-12-04T06:13:28Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil |
title |
Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil |
spellingShingle |
Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil Vesely, Fernando F. Late Paleozoic Ice Age Glacial record Ice marginal Deglaciation Itarare Group |
title_short |
Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil |
title_full |
Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil |
title_fullStr |
Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil |
title_full_unstemmed |
Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil |
title_sort |
Sedimentary record of a fluctuating ice margin from the Pennsylvanian of western Gondwana: Parana Basin, southern Brazil |
author |
Vesely, Fernando F. |
author_facet |
Vesely, Fernando F. Trzaskos, Barbara Kipper, Felipe Assine, Mario Luis [UNESP] Souza, Paulo A. |
author_role |
author |
author2 |
Trzaskos, Barbara Kipper, Felipe Assine, Mario Luis [UNESP] Souza, Paulo A. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Univ Fed Parana Universidade Estadual Paulista (Unesp) Univ Fed Rio Grande do Sul |
dc.contributor.author.fl_str_mv |
Vesely, Fernando F. Trzaskos, Barbara Kipper, Felipe Assine, Mario Luis [UNESP] Souza, Paulo A. |
dc.subject.por.fl_str_mv |
Late Paleozoic Ice Age Glacial record Ice marginal Deglaciation Itarare Group |
topic |
Late Paleozoic Ice Age Glacial record Ice marginal Deglaciation Itarare Group |
description |
The Parana Basin is a key locality in the context of the Late Paleozoic Ice Age (LPIA) because of its location east of the Andean proto-margin of Gondwana and west of contiguous interior basins today found in western Africa. In this paper we document the sedimentary record associated with an ice margin that reached the eastern border of the Parana Basin during the Pennsylvanian, with the aim of interpreting the depositional environments and discussing paleogeographic implications. The examined stratigraphic succession is divided in four stacked fades associations that record an upward transition from subglacial to glaciomarine environments. Deposition took place during deglaciation but was punctuated by minor readvances of the ice margin that deformed the sediment pile. Tillites, well-preserved landforms of subglacial erosion and glaciotectonic deformational structures indicate that the ice flowed to the north and northwest and that the ice margin did not advance far throughout the basin during the glacial maximum. Consequently, time-equivalent glacial deposits that crop out in other localities of eastern Parana Basin are better explained by assuming multiple smaller ice lobes instead of one single large glacier. These ice lobes flowed from an ice cap covering uplifted lands now located in western Namibia, where glacial deposits are younger and occur confined within paleovalleys cut onto the Precambrian basement. This conclusion corroborates the idea of a topographically-controlled ice-spreading center in southwestern Africa and does not support the view of a large polar ice sheet controlling deposition in the Parana Basin during the LPIA. (C) 2015 Published by Elsevier B.V. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-08-01 2018-11-26T16:16:33Z 2018-11-26T16:16:33Z |
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/10.1016/j.sedgeo.2015.06.012 Sedimentary Geology. Amsterdam: Elsevier Science Bv, v. 326, p. 45-63, 2015. 0037-0738 http://hdl.handle.net/11449/160747 10.1016/j.sedgeo.2015.06.012 WOS:000360252500004 WOS000360252500004.pdf 0471102133658128 0471102133658128 |
url |
http://dx.doi.org/10.1016/j.sedgeo.2015.06.012 http://hdl.handle.net/11449/160747 |
identifier_str_mv |
Sedimentary Geology. Amsterdam: Elsevier Science Bv, v. 326, p. 45-63, 2015. 0037-0738 10.1016/j.sedgeo.2015.06.012 WOS:000360252500004 WOS000360252500004.pdf 0471102133658128 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Sedimentary Geology 1,277 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
45-63 application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science 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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1803046791383351296 |