Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.gloplacha.2021.103528 http://hdl.handle.net/11449/206470 |
Resumo: | The tectonic evolution of the Equatorial Atlantic Gateway (EAG) throughout the early Cretaceous had global implications. This break-up of western Gondwana has played a significant role in causing, or amplifying, environmental changes due to its influence on ocean chemistry, nutrient distribution, water mass circulation, and bottom waters ventilation. However, the timing of its establishment and the areal extent of this oceanic gateway is still poorly constrained. Marine settings were recorded by the black shales of the Romualdo Formation (Late Aptian), Araripe Basin - Northeastern Brazil, which are known worldwide for their fossil content and importance for paleogeographic reconstructions of Gondwana. In this contribution, we present multiproxy analyses, combining macro- and micropaleontological, as well as sediment compositional data to evaluate paleoenvironmental conditions during the deposition of sedimentary strata assigned to the Romualdo Formation. We investigate the ~100-m-thick succession of the Sobradinho Section, which is the most complete exposure of the Romualdo Formation. Increased abundances of ostracods, the occurrence of agglutinated benthic foraminifera, bakevelliid bivalves, and cassiopid gastropods coincide with levels of relatively high paleosalinity estimates based on the Sr/Ba (strontium/barium) and S/TOC (sulfur/total organic carbon) ratios. These levels correspond to a transgressive system tract and the lower interval of a highstand systems tract. Throughout the section, black shales occur intercalated with sparse sandstone and calcarenite levels, and the deposition of these black shales is associated with dysoxic to anoxic bottom water conditions, as suggested by the V/Cr (vanadium/chrome) ratio. The occurrence of stagnant bottom water conditions may explain the mass mortality of ostracods in the lower interval of the succession. The upper part of the highstand system tract in the studied section was deposited in coastal environments and is characterized by coarser-grained siliciclastic-dominated facies (high log(Zr/Rb) (zirconium/rubidium) ratio), as well as increased phytoclasts and terrigenous (high magnetic susceptibility) contents. |
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Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern BrazilCretaceousEquatorial Atlantic GatewayOstracodsPaleoredoxPaleosalinityThe tectonic evolution of the Equatorial Atlantic Gateway (EAG) throughout the early Cretaceous had global implications. This break-up of western Gondwana has played a significant role in causing, or amplifying, environmental changes due to its influence on ocean chemistry, nutrient distribution, water mass circulation, and bottom waters ventilation. However, the timing of its establishment and the areal extent of this oceanic gateway is still poorly constrained. Marine settings were recorded by the black shales of the Romualdo Formation (Late Aptian), Araripe Basin - Northeastern Brazil, which are known worldwide for their fossil content and importance for paleogeographic reconstructions of Gondwana. In this contribution, we present multiproxy analyses, combining macro- and micropaleontological, as well as sediment compositional data to evaluate paleoenvironmental conditions during the deposition of sedimentary strata assigned to the Romualdo Formation. We investigate the ~100-m-thick succession of the Sobradinho Section, which is the most complete exposure of the Romualdo Formation. Increased abundances of ostracods, the occurrence of agglutinated benthic foraminifera, bakevelliid bivalves, and cassiopid gastropods coincide with levels of relatively high paleosalinity estimates based on the Sr/Ba (strontium/barium) and S/TOC (sulfur/total organic carbon) ratios. These levels correspond to a transgressive system tract and the lower interval of a highstand systems tract. Throughout the section, black shales occur intercalated with sparse sandstone and calcarenite levels, and the deposition of these black shales is associated with dysoxic to anoxic bottom water conditions, as suggested by the V/Cr (vanadium/chrome) ratio. The occurrence of stagnant bottom water conditions may explain the mass mortality of ostracods in the lower interval of the succession. The upper part of the highstand system tract in the studied section was deposited in coastal environments and is characterized by coarser-grained siliciclastic-dominated facies (high log(Zr/Rb) (zirconium/rubidium) ratio), as well as increased phytoclasts and terrigenous (high magnetic susceptibility) contents.Fundação de Amparo à Pesquisa do Estado do Rio Grande do SulConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)National Research CouncilInstituto Tecnológico de Micropaleontologia (itt Fossil) Universidade do Vale do Rio dos Sinos, Av. UNISINOS, 950Departamento Interdisciplinar - Centro de Estudos Costeiros Limnológicos e Marinhos Universidade Federal do Rio Grande do Sul, Avenida Tramandaí 976Departamento de Geologia Instituto de Geociências Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500Petrobras Cenpes BPA Cidade Universitária, Ilha do FundãoInstituto de Biociências Universidade Estadual Paulista - UnespDepartamento de Geologia Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista - Unesp, Avenida 24A, 1515Instituto de Biociências Universidade Estadual Paulista - UnespDepartamento de Geologia Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista - Unesp, Avenida 24A, 1515Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul: #16/2551-0000213-4CNPq: #201508/2009- 5CNPq: #304022/2018-7CNPq: #427280/2018-4FAPESP: 2004/15786-0FAPESP: 2014/27337-8National Research Council: 401039/2014-5Universidade do Vale do Rio dos SinosUniversidade Federal do Rio Grande do SulCidade UniversitáriaUniversidade Estadual Paulista (Unesp)Bom, Marlone H.H.Ceolin, DaianeKochhann, Karlos G.D.Krahl, GuilhermeFauth, GersonBergue, Cristianini T.Savian, Jairo F.Strohschoen Junior, OscarSimões, Marcello G. [UNESP]Assine, Mario L. [UNESP]2021-06-25T10:32:34Z2021-06-25T10:32:34Z2021-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.gloplacha.2021.103528Global and Planetary Change, v. 203.0921-8181http://hdl.handle.net/11449/20647010.1016/j.gloplacha.2021.1035282-s2.0-85107773250Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengGlobal and Planetary Changeinfo:eu-repo/semantics/openAccess2021-10-23T05:42:32Zoai:repositorio.unesp.br:11449/206470Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T15:30:12.958289Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil |
title |
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil |
spellingShingle |
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil Bom, Marlone H.H. Cretaceous Equatorial Atlantic Gateway Ostracods Paleoredox Paleosalinity |
title_short |
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil |
title_full |
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil |
title_fullStr |
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil |
title_full_unstemmed |
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil |
title_sort |
Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil |
author |
Bom, Marlone H.H. |
author_facet |
Bom, Marlone H.H. Ceolin, Daiane Kochhann, Karlos G.D. Krahl, Guilherme Fauth, Gerson Bergue, Cristianini T. Savian, Jairo F. Strohschoen Junior, Oscar Simões, Marcello G. [UNESP] Assine, Mario L. [UNESP] |
author_role |
author |
author2 |
Ceolin, Daiane Kochhann, Karlos G.D. Krahl, Guilherme Fauth, Gerson Bergue, Cristianini T. Savian, Jairo F. Strohschoen Junior, Oscar Simões, Marcello G. [UNESP] Assine, Mario L. [UNESP] |
author2_role |
author author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Vale do Rio dos Sinos Universidade Federal do Rio Grande do Sul Cidade Universitária Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Bom, Marlone H.H. Ceolin, Daiane Kochhann, Karlos G.D. Krahl, Guilherme Fauth, Gerson Bergue, Cristianini T. Savian, Jairo F. Strohschoen Junior, Oscar Simões, Marcello G. [UNESP] Assine, Mario L. [UNESP] |
dc.subject.por.fl_str_mv |
Cretaceous Equatorial Atlantic Gateway Ostracods Paleoredox Paleosalinity |
topic |
Cretaceous Equatorial Atlantic Gateway Ostracods Paleoredox Paleosalinity |
description |
The tectonic evolution of the Equatorial Atlantic Gateway (EAG) throughout the early Cretaceous had global implications. This break-up of western Gondwana has played a significant role in causing, or amplifying, environmental changes due to its influence on ocean chemistry, nutrient distribution, water mass circulation, and bottom waters ventilation. However, the timing of its establishment and the areal extent of this oceanic gateway is still poorly constrained. Marine settings were recorded by the black shales of the Romualdo Formation (Late Aptian), Araripe Basin - Northeastern Brazil, which are known worldwide for their fossil content and importance for paleogeographic reconstructions of Gondwana. In this contribution, we present multiproxy analyses, combining macro- and micropaleontological, as well as sediment compositional data to evaluate paleoenvironmental conditions during the deposition of sedimentary strata assigned to the Romualdo Formation. We investigate the ~100-m-thick succession of the Sobradinho Section, which is the most complete exposure of the Romualdo Formation. Increased abundances of ostracods, the occurrence of agglutinated benthic foraminifera, bakevelliid bivalves, and cassiopid gastropods coincide with levels of relatively high paleosalinity estimates based on the Sr/Ba (strontium/barium) and S/TOC (sulfur/total organic carbon) ratios. These levels correspond to a transgressive system tract and the lower interval of a highstand systems tract. Throughout the section, black shales occur intercalated with sparse sandstone and calcarenite levels, and the deposition of these black shales is associated with dysoxic to anoxic bottom water conditions, as suggested by the V/Cr (vanadium/chrome) ratio. The occurrence of stagnant bottom water conditions may explain the mass mortality of ostracods in the lower interval of the succession. The upper part of the highstand system tract in the studied section was deposited in coastal environments and is characterized by coarser-grained siliciclastic-dominated facies (high log(Zr/Rb) (zirconium/rubidium) ratio), as well as increased phytoclasts and terrigenous (high magnetic susceptibility) contents. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T10:32:34Z 2021-06-25T10:32:34Z 2021-08-01 |
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/10.1016/j.gloplacha.2021.103528 Global and Planetary Change, v. 203. 0921-8181 http://hdl.handle.net/11449/206470 10.1016/j.gloplacha.2021.103528 2-s2.0-85107773250 |
url |
http://dx.doi.org/10.1016/j.gloplacha.2021.103528 http://hdl.handle.net/11449/206470 |
identifier_str_mv |
Global and Planetary Change, v. 203. 0921-8181 10.1016/j.gloplacha.2021.103528 2-s2.0-85107773250 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Global and Planetary Change |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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 |
|
_version_ |
1808128522220208128 |