High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.marpetgeo.2022.105814 http://hdl.handle.net/11449/237799 |
Resumo: | The Aptian Romualdo Formation (Araripe Basin, NE Brazil) was deposited in a restricted epeiric sea, during the opening of the South Atlantic Ocean, with a coeval record to that in the Brazilian Pre-Salt succession. The upper part of the Romualdo Formation encompasses the Highstand Systems Tract of a third-order stratigraphic sequence, and contains shell beds interbedded with shale, siltstone, and fine-grained sandstone. Based on distinct taphonomic features (shell sorting, fragmentation, abrasion, rounding, and orientation), sedimentological criteria (shell abundance, type of matrix, sedimentary structures, and presence/absence of quartz grains), and stratigraphic attributes (bed thickness, geometry, contacts), the paleoenvironmental conditions and the bed-bybed accumulation history of the coquinas is disentangled. Eight carbonate microfacies were recognized, including ostracod carbonate mudstone, bivalve-gastropod wackestone, gastropod-bivalve packstone, bivalvegastropod grainstone, bivalve-gastropod floatstone, bivalve-gastropod rudstone, bakevelliid floatstone, and bakevelliid rudstone, which are organized in six, cm-thick shell concentrations. Mudstone and wackestone facies mark the settling of carbonate muds without significant bottom currents and wave action, probably below storm wave base, whereas packstone, floatstone, and rudstone, with fragmented, rounded, and oriented shells, were deposited in agitated waters, between the fair-weather and the storm wave bases. Ripple cross-laminated grainstone is interpreted as high-energy facies deposited above fair-weather wave base. The shell beds are internally complex and consist of cm-scale alternations of microfacies differing in packing, sorting, and composition. They tend to fine upwards within dm-thick shell beds, generating shallowing-upward facies sequences. The concentrations, the uppermost one with in situ bakevelliid shells in the top, record high-frequency base level oscillations influenced by eustasy and climate changes. These bioclastic accumulations originated by the superposition of sedimentologic and primary biologic processes (e.g., post-deposition meiofaunal bioturbation). The cm-thick, low-diversity shell beds are excellent examples of multiple-event carbonate deposits generated in a siliciclastic-dominated, restricted epeiric sea, revealing high-frequency cycles in proximal to distal restricted marine settings. |
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High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE BrazilEpeiric sea coquinasMulti-event shell bedsHigh-resolution sequence stratigraphyLower cretaceousThe Aptian Romualdo Formation (Araripe Basin, NE Brazil) was deposited in a restricted epeiric sea, during the opening of the South Atlantic Ocean, with a coeval record to that in the Brazilian Pre-Salt succession. The upper part of the Romualdo Formation encompasses the Highstand Systems Tract of a third-order stratigraphic sequence, and contains shell beds interbedded with shale, siltstone, and fine-grained sandstone. Based on distinct taphonomic features (shell sorting, fragmentation, abrasion, rounding, and orientation), sedimentological criteria (shell abundance, type of matrix, sedimentary structures, and presence/absence of quartz grains), and stratigraphic attributes (bed thickness, geometry, contacts), the paleoenvironmental conditions and the bed-bybed accumulation history of the coquinas is disentangled. Eight carbonate microfacies were recognized, including ostracod carbonate mudstone, bivalve-gastropod wackestone, gastropod-bivalve packstone, bivalvegastropod grainstone, bivalve-gastropod floatstone, bivalve-gastropod rudstone, bakevelliid floatstone, and bakevelliid rudstone, which are organized in six, cm-thick shell concentrations. Mudstone and wackestone facies mark the settling of carbonate muds without significant bottom currents and wave action, probably below storm wave base, whereas packstone, floatstone, and rudstone, with fragmented, rounded, and oriented shells, were deposited in agitated waters, between the fair-weather and the storm wave bases. Ripple cross-laminated grainstone is interpreted as high-energy facies deposited above fair-weather wave base. The shell beds are internally complex and consist of cm-scale alternations of microfacies differing in packing, sorting, and composition. They tend to fine upwards within dm-thick shell beds, generating shallowing-upward facies sequences. The concentrations, the uppermost one with in situ bakevelliid shells in the top, record high-frequency base level oscillations influenced by eustasy and climate changes. These bioclastic accumulations originated by the superposition of sedimentologic and primary biologic processes (e.g., post-deposition meiofaunal bioturbation). The cm-thick, low-diversity shell beds are excellent examples of multiple-event carbonate deposits generated in a siliciclastic-dominated, restricted epeiric sea, revealing high-frequency cycles in proximal to distal restricted marine settings.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)PetrobrasCenter for Geosciences Applied to Petroleum Geology -UNESPetro, IGCE/Unesp/Rio ClaroP,D&I Clause of ANP ResolutionUniv Estadual Paulista, Dept Geol, Inst Geociencias & Ciencias Exatas, Ave 24A 1515, BR-12506900 Rio Claro, BrazilUniv Estadual Paulista, Setor Zool, Inst Biociencias, Dist Rubiao Junior, BR-18618000 Botucatu, BrazilUniv Fed Ouro Preto, Dept Geol, Escola Minas, Morro Cruzeiro, BR-35400000 Ouro Preto, MG, BrazilFriedrich Alexander Univ Erlangen Nurnberg, Geozentrum Nordbayern, FG Palaoumwelt, Loewenichstr 28, D-91054 Erlangen, GermanyUniv Estadual Paulista, Dept Geol, Inst Geociencias & Ciencias Exatas, Ave 24A 1515, BR-12506900 Rio Claro, BrazilUniv Estadual Paulista, Setor Zool, Inst Biociencias, Dist Rubiao Junior, BR-18618000 Botucatu, BrazilFAPESP: 18/01750-7FAPESP: 16/13214-7FAPESP: 17/20803-1CNPq: 401039/2014-5CNPq: 304800/2017-1Petrobras: 2014/00519-9P,D&I Clause of ANP Resolution: 50/2015Elsevier B.V.Universidade Estadual Paulista (UNESP)Univ Fed Ouro PretoFriedrich Alexander Univ Erlangen NurnbergRodrigues, M. G. [UNESP]Varejao, F. G.Matos, S. A. [UNESP]Fuersich, F. T.Warren, L. V. [UNESP]Assine, M. L. [UNESP]Simoes, M. G. [UNESP]2022-11-30T13:45:18Z2022-11-30T13:45:18Z2022-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article22http://dx.doi.org/10.1016/j.marpetgeo.2022.105814Marine And Petroleum Geology. Oxford: Elsevier Sci Ltd, v. 143, 22 p., 2022.0264-8172http://hdl.handle.net/11449/23779910.1016/j.marpetgeo.2022.105814WOS:000833859200001Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMarine And Petroleum Geologyinfo:eu-repo/semantics/openAccess2022-11-30T13:45:19Zoai:repositorio.unesp.br:11449/237799Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-11-30T13:45:19Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil |
title |
High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil |
spellingShingle |
High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil Rodrigues, M. G. [UNESP] Epeiric sea coquinas Multi-event shell beds High-resolution sequence stratigraphy Lower cretaceous |
title_short |
High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil |
title_full |
High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil |
title_fullStr |
High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil |
title_full_unstemmed |
High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil |
title_sort |
High-resolution taphonomy and sequence stratigraphy of internally complex, bakevelliid-dominated coquinas from the Aptian Romualdo Formation, Araripe Basin, NE Brazil |
author |
Rodrigues, M. G. [UNESP] |
author_facet |
Rodrigues, M. G. [UNESP] Varejao, F. G. Matos, S. A. [UNESP] Fuersich, F. T. Warren, L. V. [UNESP] Assine, M. L. [UNESP] Simoes, M. G. [UNESP] |
author_role |
author |
author2 |
Varejao, F. G. Matos, S. A. [UNESP] Fuersich, F. T. Warren, L. V. [UNESP] Assine, M. L. [UNESP] Simoes, M. G. [UNESP] |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Univ Fed Ouro Preto Friedrich Alexander Univ Erlangen Nurnberg |
dc.contributor.author.fl_str_mv |
Rodrigues, M. G. [UNESP] Varejao, F. G. Matos, S. A. [UNESP] Fuersich, F. T. Warren, L. V. [UNESP] Assine, M. L. [UNESP] Simoes, M. G. [UNESP] |
dc.subject.por.fl_str_mv |
Epeiric sea coquinas Multi-event shell beds High-resolution sequence stratigraphy Lower cretaceous |
topic |
Epeiric sea coquinas Multi-event shell beds High-resolution sequence stratigraphy Lower cretaceous |
description |
The Aptian Romualdo Formation (Araripe Basin, NE Brazil) was deposited in a restricted epeiric sea, during the opening of the South Atlantic Ocean, with a coeval record to that in the Brazilian Pre-Salt succession. The upper part of the Romualdo Formation encompasses the Highstand Systems Tract of a third-order stratigraphic sequence, and contains shell beds interbedded with shale, siltstone, and fine-grained sandstone. Based on distinct taphonomic features (shell sorting, fragmentation, abrasion, rounding, and orientation), sedimentological criteria (shell abundance, type of matrix, sedimentary structures, and presence/absence of quartz grains), and stratigraphic attributes (bed thickness, geometry, contacts), the paleoenvironmental conditions and the bed-bybed accumulation history of the coquinas is disentangled. Eight carbonate microfacies were recognized, including ostracod carbonate mudstone, bivalve-gastropod wackestone, gastropod-bivalve packstone, bivalvegastropod grainstone, bivalve-gastropod floatstone, bivalve-gastropod rudstone, bakevelliid floatstone, and bakevelliid rudstone, which are organized in six, cm-thick shell concentrations. Mudstone and wackestone facies mark the settling of carbonate muds without significant bottom currents and wave action, probably below storm wave base, whereas packstone, floatstone, and rudstone, with fragmented, rounded, and oriented shells, were deposited in agitated waters, between the fair-weather and the storm wave bases. Ripple cross-laminated grainstone is interpreted as high-energy facies deposited above fair-weather wave base. The shell beds are internally complex and consist of cm-scale alternations of microfacies differing in packing, sorting, and composition. They tend to fine upwards within dm-thick shell beds, generating shallowing-upward facies sequences. The concentrations, the uppermost one with in situ bakevelliid shells in the top, record high-frequency base level oscillations influenced by eustasy and climate changes. These bioclastic accumulations originated by the superposition of sedimentologic and primary biologic processes (e.g., post-deposition meiofaunal bioturbation). The cm-thick, low-diversity shell beds are excellent examples of multiple-event carbonate deposits generated in a siliciclastic-dominated, restricted epeiric sea, revealing high-frequency cycles in proximal to distal restricted marine settings. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-11-30T13:45:18Z 2022-11-30T13:45:18Z 2022-09-01 |
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.marpetgeo.2022.105814 Marine And Petroleum Geology. Oxford: Elsevier Sci Ltd, v. 143, 22 p., 2022. 0264-8172 http://hdl.handle.net/11449/237799 10.1016/j.marpetgeo.2022.105814 WOS:000833859200001 |
url |
http://dx.doi.org/10.1016/j.marpetgeo.2022.105814 http://hdl.handle.net/11449/237799 |
identifier_str_mv |
Marine And Petroleum Geology. Oxford: Elsevier Sci Ltd, v. 143, 22 p., 2022. 0264-8172 10.1016/j.marpetgeo.2022.105814 WOS:000833859200001 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Marine And Petroleum Geology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
22 |
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 |
|
_version_ |
1799965761544912896 |