Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil

Detalhes bibliográficos
Autor(a) principal: Bom, Marlone H.H.
Data de Publicação: 2021
Outros Autores: 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]
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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spelling 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
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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)
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