Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia
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/10.1016/j.palaeo.2018.11.032 http://hdl.handle.net/11449/187129 |
Resumo: | The fossiliferous beds of the Solimões Formation, western Brazilian Amazon have yielded several vertebrate fossils that are key to understand the evolution of Neotropical biotas. Although this sedimentary unit has been studied for more than two centuries, no absolute dates are available so far, preventing more precise bio/chronostratigraphic interpretations and broader comprehension of the biotic/geological events that affected this northern portion of South America during the Neogene. Here, we present the first Neogene radioisotopic dates for the Brazilian Amazon, via U-Pb dating of detrital zircon from two classical sites. Both samples have small proportions of relatively young zircon grains, the dates from which are the maximum ages of deposition. LA-ICPMS analysis of two grains from the Niterói locality yielded a weighted mean of 8.5 ± 0.5 Ma and CA-TIMS analysis of two grains from the Talismã locality yielded a weighted mean of 10.89 ± 0.13 Ma. These maximum deposition ages are in the Tortonian stage, late Miocene, confirming the age previously inferred based on biochronological data. |
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Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western AmazoniaAbsolute ageAcre faunaMioceneSALMASolimões FormationThe fossiliferous beds of the Solimões Formation, western Brazilian Amazon have yielded several vertebrate fossils that are key to understand the evolution of Neotropical biotas. Although this sedimentary unit has been studied for more than two centuries, no absolute dates are available so far, preventing more precise bio/chronostratigraphic interpretations and broader comprehension of the biotic/geological events that affected this northern portion of South America during the Neogene. Here, we present the first Neogene radioisotopic dates for the Brazilian Amazon, via U-Pb dating of detrital zircon from two classical sites. Both samples have small proportions of relatively young zircon grains, the dates from which are the maximum ages of deposition. LA-ICPMS analysis of two grains from the Niterói locality yielded a weighted mean of 8.5 ± 0.5 Ma and CA-TIMS analysis of two grains from the Talismã locality yielded a weighted mean of 10.89 ± 0.13 Ma. These maximum deposition ages are in the Tortonian stage, late Miocene, confirming the age previously inferred based on biochronological data.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Universidade de São Paulo–USP Faculdade de Filosofia Ciências e Letras de Ribeirão PretoUniversidade Federal de Santa Maria-UFSM CAPPA – Centro de Apoio à Pesquisa Paleontológica da Quarta ColôniaBoise State University Department of GeosciencesMuseu de Ciências Naturais da Fundação Zoobotânica do Rio Grande do SulUniversidade Estadual Paulista–UNESP Departamento de Ciências Biológicas Faculdade de CiênciasUniversidade Federal do Acre–UFAC Departamento de Ciências da Natureza, Campus UniversitárioUniversidade Federal do Acre–UFAC Campus FlorestaUniversidade Estadual Paulista–UNESP Departamento de Ciências Biológicas Faculdade de CiênciasFAPESP: 2011/14080-0FAPESP: 2014/02206-9FAPESP: 2016/00476-3CNPq: 309434/2015-7Universidade de São Paulo (USP)Universidade Federal de Sergipe (UFS)Boise State UniversityMuseu de Ciências Naturais da Fundação Zoobotânica do Rio Grande do SulUniversidade Estadual Paulista (Unesp)Universidade Federal do Acre–UFACBissaro-Júnior, Marcos C.Kerber, LeonardoCrowley, James L.Ribeiro, Ana M.Ghilardi, Renato P. [UNESP]Guilherme, EdsonNegri, Francisco R.Souza Filho, Jonas P.Hsiou, Annie S.2019-10-06T15:26:21Z2019-10-06T15:26:21Z2019-02-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article64-70http://dx.doi.org/10.1016/j.palaeo.2018.11.032Palaeogeography, Palaeoclimatology, Palaeoecology, v. 516, p. 64-70.0031-0182http://hdl.handle.net/11449/18712910.1016/j.palaeo.2018.11.0322-s2.0-85057614121Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPalaeogeography, Palaeoclimatology, Palaeoecologyinfo:eu-repo/semantics/openAccess2021-10-22T18:33:23Zoai:repositorio.unesp.br:11449/187129Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T18:33:23Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia |
title |
Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia |
spellingShingle |
Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia Bissaro-Júnior, Marcos C. Absolute age Acre fauna Miocene SALMA Solimões Formation |
title_short |
Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia |
title_full |
Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia |
title_fullStr |
Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia |
title_full_unstemmed |
Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia |
title_sort |
Detrital zircon U–Pb geochronology constrains the age of Brazilian Neogene deposits from Western Amazonia |
author |
Bissaro-Júnior, Marcos C. |
author_facet |
Bissaro-Júnior, Marcos C. Kerber, Leonardo Crowley, James L. Ribeiro, Ana M. Ghilardi, Renato P. [UNESP] Guilherme, Edson Negri, Francisco R. Souza Filho, Jonas P. Hsiou, Annie S. |
author_role |
author |
author2 |
Kerber, Leonardo Crowley, James L. Ribeiro, Ana M. Ghilardi, Renato P. [UNESP] Guilherme, Edson Negri, Francisco R. Souza Filho, Jonas P. Hsiou, Annie S. |
author2_role |
author author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Federal de Sergipe (UFS) Boise State University Museu de Ciências Naturais da Fundação Zoobotânica do Rio Grande do Sul Universidade Estadual Paulista (Unesp) Universidade Federal do Acre–UFAC |
dc.contributor.author.fl_str_mv |
Bissaro-Júnior, Marcos C. Kerber, Leonardo Crowley, James L. Ribeiro, Ana M. Ghilardi, Renato P. [UNESP] Guilherme, Edson Negri, Francisco R. Souza Filho, Jonas P. Hsiou, Annie S. |
dc.subject.por.fl_str_mv |
Absolute age Acre fauna Miocene SALMA Solimões Formation |
topic |
Absolute age Acre fauna Miocene SALMA Solimões Formation |
description |
The fossiliferous beds of the Solimões Formation, western Brazilian Amazon have yielded several vertebrate fossils that are key to understand the evolution of Neotropical biotas. Although this sedimentary unit has been studied for more than two centuries, no absolute dates are available so far, preventing more precise bio/chronostratigraphic interpretations and broader comprehension of the biotic/geological events that affected this northern portion of South America during the Neogene. Here, we present the first Neogene radioisotopic dates for the Brazilian Amazon, via U-Pb dating of detrital zircon from two classical sites. Both samples have small proportions of relatively young zircon grains, the dates from which are the maximum ages of deposition. LA-ICPMS analysis of two grains from the Niterói locality yielded a weighted mean of 8.5 ± 0.5 Ma and CA-TIMS analysis of two grains from the Talismã locality yielded a weighted mean of 10.89 ± 0.13 Ma. These maximum deposition ages are in the Tortonian stage, late Miocene, confirming the age previously inferred based on biochronological data. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:26:21Z 2019-10-06T15:26:21Z 2019-02-15 |
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.palaeo.2018.11.032 Palaeogeography, Palaeoclimatology, Palaeoecology, v. 516, p. 64-70. 0031-0182 http://hdl.handle.net/11449/187129 10.1016/j.palaeo.2018.11.032 2-s2.0-85057614121 |
url |
http://dx.doi.org/10.1016/j.palaeo.2018.11.032 http://hdl.handle.net/11449/187129 |
identifier_str_mv |
Palaeogeography, Palaeoclimatology, Palaeoecology, v. 516, p. 64-70. 0031-0182 10.1016/j.palaeo.2018.11.032 2-s2.0-85057614121 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Palaeogeography, Palaeoclimatology, Palaeoecology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
64-70 |
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_ |
1803649492238467072 |