The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/2317-4889201920190057 http://hdl.handle.net/11449/197560 |
Resumo: | Sedimentologic and stratigraphic studies of paleo-deserts from the Brazilian Cretaceous are of great potential to understand the paleoclimate and paleogeography of Gondwana during its final rifting stage. Herein, we describe and discuss two depositional units characterized by two distinct eolian systems that are bounded by a long-lived unconformity. The Lower Unit (Barremian/Aptian) encompasses a wet eolian system composed of dune, interdunes, and ephemeral alluvial deposits. A continuous paleosol horizon in the upper part of the Lower Unit records dune stabilization and end of eolian accumulation, in a period of climate amelioration possibly in the late Aptian. The stratigraphic gap proposed for the unconformity (Cenomanian to Coniacian) coincides with the Cretaceous Thermal Maximum. The Upper Unit (Santonian?/ Campanian) comprises dune fields of a dry eolian system capped by the Mata da Corda volcanic rocks. Cross stratification dip directions from both eolian systems shows transport towards SSW. Paleo-winds coming from the northeast quadrant reveal that the continental breakup and drifting had little influence on the surface winds in this Gondwana sector. The Upper Cretaceous paleo-winds are coherent with global paleo-circulation models, based on a high-pressure cell over the South Atlantic proto-ocean, favoring desertification in the inner portion of the southwestern Gondwana. |
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The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significanceAreado GroupEolian systemsCretaceous paleo-windsSanfranciscana BasinSedimentologic and stratigraphic studies of paleo-deserts from the Brazilian Cretaceous are of great potential to understand the paleoclimate and paleogeography of Gondwana during its final rifting stage. Herein, we describe and discuss two depositional units characterized by two distinct eolian systems that are bounded by a long-lived unconformity. The Lower Unit (Barremian/Aptian) encompasses a wet eolian system composed of dune, interdunes, and ephemeral alluvial deposits. A continuous paleosol horizon in the upper part of the Lower Unit records dune stabilization and end of eolian accumulation, in a period of climate amelioration possibly in the late Aptian. The stratigraphic gap proposed for the unconformity (Cenomanian to Coniacian) coincides with the Cretaceous Thermal Maximum. The Upper Unit (Santonian?/ Campanian) comprises dune fields of a dry eolian system capped by the Mata da Corda volcanic rocks. Cross stratification dip directions from both eolian systems shows transport towards SSW. Paleo-winds coming from the northeast quadrant reveal that the continental breakup and drifting had little influence on the surface winds in this Gondwana sector. The Upper Cretaceous paleo-winds are coherent with global paleo-circulation models, based on a high-pressure cell over the South Atlantic proto-ocean, favoring desertification in the inner portion of the southwestern Gondwana.PetrobrasConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Estadual Paulista, Inst Geociencias & Ciencias Exatas, Rio Claro, SP, BrazilUniv Estadual Campinas, Inst Geociencias, Campinas, SP, BrazilUniv Sao Paulo, Inst Geociencias, Sao Paulo, SP, BrazilUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, Rio Claro, SP, BrazilPetrobras: 2014/00519-9Soc Brasileira GeologiaUniversidade Estadual Paulista (Unesp)Universidade Estadual de Campinas (UNICAMP)Universidade de São Paulo (USP)Mescolotti, Patricia Colombo [UNESP]Varejao, Filipe Giovanini [UNESP]Warren, Lucas Verissimo [UNESP]Bernardes Ladeira, Francisco SergioFonseca Giannini, Paulo CesarAssine, Mario Luis [UNESP]2020-12-11T03:29:36Z2020-12-11T03:29:36Z2019-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article20application/pdfhttp://dx.doi.org/10.1590/2317-4889201920190057Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 49, n. 3, 20 p., 2019.2317-4889http://hdl.handle.net/11449/19756010.1590/2317-4889201920190057S2317-48892019000300309WOS:000498951000001S2317-48892019000300309.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal Of Geologyinfo:eu-repo/semantics/openAccess2023-12-16T06:22:39Zoai:repositorio.unesp.br:11449/197560Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:30:27.699737Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance |
title |
The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance |
spellingShingle |
The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance Mescolotti, Patricia Colombo [UNESP] Areado Group Eolian systems Cretaceous paleo-winds Sanfranciscana Basin |
title_short |
The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance |
title_full |
The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance |
title_fullStr |
The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance |
title_full_unstemmed |
The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance |
title_sort |
The sedimentary record of wet and dry eolian systems in the Cretaceous of Southeast Brazil: stratigraphic and paleogeographic significance |
author |
Mescolotti, Patricia Colombo [UNESP] |
author_facet |
Mescolotti, Patricia Colombo [UNESP] Varejao, Filipe Giovanini [UNESP] Warren, Lucas Verissimo [UNESP] Bernardes Ladeira, Francisco Sergio Fonseca Giannini, Paulo Cesar Assine, Mario Luis [UNESP] |
author_role |
author |
author2 |
Varejao, Filipe Giovanini [UNESP] Warren, Lucas Verissimo [UNESP] Bernardes Ladeira, Francisco Sergio Fonseca Giannini, Paulo Cesar Assine, Mario Luis [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade Estadual de Campinas (UNICAMP) Universidade de São Paulo (USP) |
dc.contributor.author.fl_str_mv |
Mescolotti, Patricia Colombo [UNESP] Varejao, Filipe Giovanini [UNESP] Warren, Lucas Verissimo [UNESP] Bernardes Ladeira, Francisco Sergio Fonseca Giannini, Paulo Cesar Assine, Mario Luis [UNESP] |
dc.subject.por.fl_str_mv |
Areado Group Eolian systems Cretaceous paleo-winds Sanfranciscana Basin |
topic |
Areado Group Eolian systems Cretaceous paleo-winds Sanfranciscana Basin |
description |
Sedimentologic and stratigraphic studies of paleo-deserts from the Brazilian Cretaceous are of great potential to understand the paleoclimate and paleogeography of Gondwana during its final rifting stage. Herein, we describe and discuss two depositional units characterized by two distinct eolian systems that are bounded by a long-lived unconformity. The Lower Unit (Barremian/Aptian) encompasses a wet eolian system composed of dune, interdunes, and ephemeral alluvial deposits. A continuous paleosol horizon in the upper part of the Lower Unit records dune stabilization and end of eolian accumulation, in a period of climate amelioration possibly in the late Aptian. The stratigraphic gap proposed for the unconformity (Cenomanian to Coniacian) coincides with the Cretaceous Thermal Maximum. The Upper Unit (Santonian?/ Campanian) comprises dune fields of a dry eolian system capped by the Mata da Corda volcanic rocks. Cross stratification dip directions from both eolian systems shows transport towards SSW. Paleo-winds coming from the northeast quadrant reveal that the continental breakup and drifting had little influence on the surface winds in this Gondwana sector. The Upper Cretaceous paleo-winds are coherent with global paleo-circulation models, based on a high-pressure cell over the South Atlantic proto-ocean, favoring desertification in the inner portion of the southwestern Gondwana. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-01-01 2020-12-11T03:29:36Z 2020-12-11T03:29:36Z |
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/10.1590/2317-4889201920190057 Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 49, n. 3, 20 p., 2019. 2317-4889 http://hdl.handle.net/11449/197560 10.1590/2317-4889201920190057 S2317-48892019000300309 WOS:000498951000001 S2317-48892019000300309.pdf |
url |
http://dx.doi.org/10.1590/2317-4889201920190057 http://hdl.handle.net/11449/197560 |
identifier_str_mv |
Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 49, n. 3, 20 p., 2019. 2317-4889 10.1590/2317-4889201920190057 S2317-48892019000300309 WOS:000498951000001 S2317-48892019000300309.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Brazilian Journal Of Geology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
20 application/pdf |
dc.publisher.none.fl_str_mv |
Soc Brasileira Geologia |
publisher.none.fl_str_mv |
Soc Brasileira Geologia |
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 |
|
_version_ |
1808129211961966592 |