AGES OF GRANITES OF THE SERRINHA NUCLEUS, BAHIA (BRAZIL): AN OVERVIEW

AGES OF GRANITES OF THE SERRINHA NUCLEUS, BAHIA (BRAZIL): AN OVERVIEW

dc.contributoren-US
dc.contributorpt-BR
dc.creatorRIOS, DÉBORA CORREIA
dc.creatorDAVIS, DONALD WAYNE
dc.creatorCONCEIÇÃO, HERBET
dc.creatorMACAMBIRA, MOACIR JOSÉ BUENANO
dc.creatorPEIXOTO, ADRIANA ALMEIDA
dc.creatorCRUZ FILHO, BASÍLIO ELESBÃO DA
dc.creatorOLIVEIRA, LÍVIA LIMA
dc.date2017-04-13
dc.date.accessioned2023-06-19T16:32:57Z
dc.date.available2023-06-19T16:32:57Z
dc.identifierhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10885
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/6693843
dc.descriptionThe ages of granites of the Serrinha Nucleus (SN), in the eastern part of Bahia State, Brazil are poorly constrained and radiometric dating is mainly by the Rb-Sr whole rock isochron method, indicating a complex intrusive history. New Pb-Pb and U-Pb zircon for plutons widely distributed within the SN terrains range from Archean (>3070 Ma) to Paleoproterozoic (2067 Ma) and generally support the interpretation that at least three plutonic events affect these terrains. The range of ages evidently constitutes a large interval of regional granitic emplacement which can be divided into three principal domains: pre, syn and late/post tectonic. The new Archean ages (2.7 to 3.1 Ga.) by the U-Pb zircon method indicate reworking of an older crust during the Paleoproterozoic plutonic event in the SN region and clearly point to the existence of an Archean basement prior to 2.7 Ga. (Jequié Cycle). The younger ages (table 1) help to further constrain the extension and age of Archean components of the São Francisco Craton which is important for a complete understanding of the Precambrian geology of that part of Brazil.en-US
dc.descriptionThe ages of granites of the Serrinha Nucleus (SN), in the eastern part of Bahia State, Brazil are poorly constrained and radiometric dating is mainly by the Rb-Sr whole rock isochron method, indicating a complex intrusive history. New Pb-Pb and U-Pb zircon for plutons widely distributed within the SN terrains range from Archean (>3070 Ma) to Paleoproterozoic (2067 Ma) and generally support the interpretation that at least three plutonic events affect these terrains. The range of ages evidently constitutes a large interval of regional granitic emplacement which can be divided into three principal domains: pre, syn and late/post tectonic. The new Archean ages (2.7 to 3.1 Ga.) by the U-Pb zircon method indicate reworking of an older crust during the Paleoproterozoic plutonic event in the SN region and clearly point to the existence of an Archean basement prior to 2.7 Ga. (Jequié Cycle). The younger ages (table 1) help to further constrain the extension and age of Archean components of the São Francisco Craton which is important for a complete understanding of the Precambrian geology of that part of Brazil.pt-BR
dc.formatapplication/pdf
dc.languageeng
dc.publisherSociedade Brasileira de Geologiapt-BR
dc.relationhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10885/10345
dc.rightsDireitos autorais 2017 Revista Brasileira de Geociênciaspt-BR
dc.sourceRevista Brasileira de Geociências; v. 30, n. 1 (2000); 074-077en-US
dc.sourceRevista Brasileira de Geociências; v. 30, n. 1 (2000); 074-077es-ES
dc.sourceRevista Brasileira de Geociências; v. 30, n. 1 (2000); 074-077pt-BR
dc.source0375-7536
dc.subjectSerrinha Nucleus; Paleoproterozoic; Geochronology.en-US
dc.subjectSerrinha Nucleus; Paleoproterozoic; Geochronology.pt-BR
dc.titleAGES OF GRANITES OF THE SERRINHA NUCLEUS, BAHIA (BRAZIL): AN OVERVIEWen-US
dc.titleAGES OF GRANITES OF THE SERRINHA NUCLEUS, BAHIA (BRAZIL): AN OVERVIEWpt-BR
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typept-BR


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