New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil

Detalhes bibliográficos
Autor(a) principal: Gomes,Celso de Barros
Data de Publicação: 2018
Outros Autores: Azzone,Rogério Guitarrari, Ruberti,Excelso, Vasconcelos,Paulo Marcos de, Sato,Kei, Rojas,Gaston Eduardo Enrich
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Brazilian Journal of Geology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000200403
Resumo: ABSTRACT: New age determinations by Ar-Ar and U-Pb SHRIMP for the alkaline complexes of Banhadão and Itapirapuã that occur in the Ribeira Valley are in agreement with the previously radiometric K-Ar ages available in literature. Ar-Ar ages on biotite for Banhadão range in the 106-110 Ma interval, and suggest a minimum age of 106 Ma for the complex. Ar-Ar data on biotite for Itapirapuã are more uniform, indicating an age of 102 Ma for the complex. U-Pb SHRIMP determinations on titanite from Itapirapuã melanite syenitic rocks yielded an age of ~106 Ma. Thus, the age interval of 100 and 110 Ma does exist indeed, suggesting an intermediate magmatic pulse between the already well-defined peaks of 80-90 Ma and 130-140 Ma for the alkaline rocks in southern Brazil, confirming the periodicity of the magmatism.
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spelling New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern BrazilAlkaline rocksPonta Grossa ArchGeochronologyABSTRACT: New age determinations by Ar-Ar and U-Pb SHRIMP for the alkaline complexes of Banhadão and Itapirapuã that occur in the Ribeira Valley are in agreement with the previously radiometric K-Ar ages available in literature. Ar-Ar ages on biotite for Banhadão range in the 106-110 Ma interval, and suggest a minimum age of 106 Ma for the complex. Ar-Ar data on biotite for Itapirapuã are more uniform, indicating an age of 102 Ma for the complex. U-Pb SHRIMP determinations on titanite from Itapirapuã melanite syenitic rocks yielded an age of ~106 Ma. Thus, the age interval of 100 and 110 Ma does exist indeed, suggesting an intermediate magmatic pulse between the already well-defined peaks of 80-90 Ma and 130-140 Ma for the alkaline rocks in southern Brazil, confirming the periodicity of the magmatism.Sociedade Brasileira de Geologia2018-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000200403Brazilian Journal of Geology v.48 n.2 2018reponame:Brazilian Journal of Geologyinstname:Sociedade Brasileira de Geologia (SBGEO)instacron:SBGEO10.1590/2317-4889201820170094info:eu-repo/semantics/openAccessGomes,Celso de BarrosAzzone,Rogério GuitarrariRuberti,ExcelsoVasconcelos,Paulo Marcos deSato,KeiRojas,Gaston Eduardo Enricheng2018-07-11T00:00:00Zoai:scielo:S2317-48892018000200403Revistahttp://bjg.siteoficial.ws/index.htmhttps://old.scielo.br/oai/scielo-oai.phpsbgsede@sbgeo.org.br||claudio.riccomini@gmail.com2317-46922317-4692opendoar:2018-07-11T00:00Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO)false
dc.title.none.fl_str_mv New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
title New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
spellingShingle New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
Gomes,Celso de Barros
Alkaline rocks
Ponta Grossa Arch
Geochronology
title_short New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
title_full New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
title_fullStr New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
title_full_unstemmed New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
title_sort New age determinations for the Banhadão and Itapirapuã complexes in the Ribeira Valley, southern Brazil
author Gomes,Celso de Barros
author_facet Gomes,Celso de Barros
Azzone,Rogério Guitarrari
Ruberti,Excelso
Vasconcelos,Paulo Marcos de
Sato,Kei
Rojas,Gaston Eduardo Enrich
author_role author
author2 Azzone,Rogério Guitarrari
Ruberti,Excelso
Vasconcelos,Paulo Marcos de
Sato,Kei
Rojas,Gaston Eduardo Enrich
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Gomes,Celso de Barros
Azzone,Rogério Guitarrari
Ruberti,Excelso
Vasconcelos,Paulo Marcos de
Sato,Kei
Rojas,Gaston Eduardo Enrich
dc.subject.por.fl_str_mv Alkaline rocks
Ponta Grossa Arch
Geochronology
topic Alkaline rocks
Ponta Grossa Arch
Geochronology
description ABSTRACT: New age determinations by Ar-Ar and U-Pb SHRIMP for the alkaline complexes of Banhadão and Itapirapuã that occur in the Ribeira Valley are in agreement with the previously radiometric K-Ar ages available in literature. Ar-Ar ages on biotite for Banhadão range in the 106-110 Ma interval, and suggest a minimum age of 106 Ma for the complex. Ar-Ar data on biotite for Itapirapuã are more uniform, indicating an age of 102 Ma for the complex. U-Pb SHRIMP determinations on titanite from Itapirapuã melanite syenitic rocks yielded an age of ~106 Ma. Thus, the age interval of 100 and 110 Ma does exist indeed, suggesting an intermediate magmatic pulse between the already well-defined peaks of 80-90 Ma and 130-140 Ma for the alkaline rocks in southern Brazil, confirming the periodicity of the magmatism.
publishDate 2018
dc.date.none.fl_str_mv 2018-06-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000200403
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892018000200403
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/2317-4889201820170094
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Geologia
publisher.none.fl_str_mv Sociedade Brasileira de Geologia
dc.source.none.fl_str_mv Brazilian Journal of Geology v.48 n.2 2018
reponame:Brazilian Journal of Geology
instname:Sociedade Brasileira de Geologia (SBGEO)
instacron:SBGEO
instname_str Sociedade Brasileira de Geologia (SBGEO)
instacron_str SBGEO
institution SBGEO
reponame_str Brazilian Journal of Geology
collection Brazilian Journal of Geology
repository.name.fl_str_mv Brazilian Journal of Geology - Sociedade Brasileira de Geologia (SBGEO)
repository.mail.fl_str_mv sbgsede@sbgeo.org.br||claudio.riccomini@gmail.com
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