RE-APPRAISAL OF THE SANTA RITA GREENSTONE BELT STRATIGRAPHY, CENTRAL BRAZIL, BASED ON NEW U-PB SHRIMP AGE AND SM-ND DATA OF FELSIC METAVOLCANIC ROCKS

RE-APPRAISAL OF THE SANTA RITA GREENSTONE BELT STRATIGRAPHY, CENTRAL BRAZIL, BASED ON NEW U-PB SHRIMP AGE AND SM-ND DATA OF FELSIC METAVOLCANIC ROCKS

dc.contributoren-US
dc.contributorpt-BR
dc.creatorPIMENTEL, MÁRCIO MARTINS
dc.creatorJOST, HARDY
dc.creatorARMSTRONG, RICHARD
dc.creatorFUCK, REINHARDT ADOLFO
dc.creatorJUNGES, SÉRGIO LUIZ
dc.creatorRESENDE, MARCELO GONÇALVES
dc.date2017-04-13
dc.date.accessioned2023-06-19T15:32:30Z
dc.date.available2023-06-19T15:32:30Z
dc.identifierhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10965
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/6692984
dc.descriptionThe Santa Rita greenstone belt represents one of the supracrustal belts of the Archaean terranes of Goiás, central Brazil. The stratigraphic sequence of this greenstone belt comprises a lower unit made of komatiites and basalts and an upper metasedimentary unit made of carbonaceous schist, chert, iron formation and marble, unconformably overlain by clastic metasedimentary rocks. Felsic metavolcanics occur at the interface between the metabasalts and the upper metasedimentary pile. U-Pb SHRIMP age for zircons from the felsic metavolcanics reveal that it is not part of the Archaean sequence, but represents the product of a Mesoproterozoic (1580 ± 12 Ma) magmatic event. Sm-Nd isotopic data (initial eCHUR values between -10.5 and –14.9) and TDM values of 3.0 and 3.2 Ga, within the range of the surrounding TTG terranes, indicate that the original felsic magmas were produced by re-melting of Archaean crust. The data demonstrate that the Goiás greenstone belt contains infolded and imbricated Proterozoic rocks, as previously suggested by Sm-Nd isotopic analyses of some of the upper detrital metasedimentary rocks.en-US
dc.descriptionThe Santa Rita greenstone belt represents one of the supracrustal belts of the Archaean terranes of Goiás, central Brazil. The stratigraphic sequence of this greenstone belt comprises a lower unit made of komatiites and basalts and an upper metasedimentary unit made of carbonaceous schist, chert, iron formation and marble, unconformably overlain by clastic metasedimentary rocks. Felsic metavolcanics occur at the interface between the metabasalts and the upper metasedimentary pile. U-Pb SHRIMP age for zircons from the felsic metavolcanics reveal that it is not part of the Archaean sequence, but represents the product of a Mesoproterozoic (1580 ± 12 Ma) magmatic event. Sm-Nd isotopic data (initial eCHUR values between -10.5 and –14.9) and TDM values of 3.0 and 3.2 Ga, within the range of the surrounding TTG terranes, indicate that the original felsic magmas were produced by re-melting of Archaean crust. The data demonstrate that the Goiás greenstone belt contains infolded and imbricated Proterozoic rocks, as previously suggested by Sm-Nd isotopic analyses of some of the upper detrital metasedimentary rocks.pt-BR
dc.formatapplication/pdf
dc.languageeng
dc.publisherSociedade Brasileira de Geologiapt-BR
dc.relationhttps://ppegeo.igc.usp.br/index.php/rbg/article/view/10965/10419
dc.rightsDireitos autorais 2017 Revista Brasileira de Geociênciaspt-BR
dc.sourceRevista Brasileira de Geociências; v. 30, n. 1 (2000); 157-160en-US
dc.sourceRevista Brasileira de Geociências; v. 30, n. 1 (2000); 157-160es-ES
dc.sourceRevista Brasileira de Geociências; v. 30, n. 1 (2000); 157-160pt-BR
dc.source0375-7536
dc.subjectGoiás; Greenstone Belts; U-Pb SHRIMP; Stratigraphy.en-US
dc.subjectGoiás; Greenstone Belts; U-Pb SHRIMP; Stratigraphy.pt-BR
dc.titleRE-APPRAISAL OF THE SANTA RITA GREENSTONE BELT STRATIGRAPHY, CENTRAL BRAZIL, BASED ON NEW U-PB SHRIMP AGE AND SM-ND DATA OF FELSIC METAVOLCANIC ROCKSen-US
dc.titleRE-APPRAISAL OF THE SANTA RITA GREENSTONE BELT STRATIGRAPHY, CENTRAL BRAZIL, BASED ON NEW U-PB SHRIMP AGE AND SM-ND DATA OF FELSIC METAVOLCANIC ROCKSpt-BR
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typept-BR


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