Geochemistry and Nd Isotope Composition of Capané Antiform Metavolcanic Rocks, Porongos Metamorphic Complex, RS

dc.contributorpt-BR
dc.contributoren-US
dc.creatorGOLLMANN, KARINE GOLLMANN
dc.creatorMARQUES, JULIANA CHARÃO
dc.creatorFRANTZ, JOSÉ CARLOS
dc.creatorJUNIOR, FARID CHEMALE
dc.date2008-12-31
dc.date.accessioned2018-11-07T21:58:34Z
dc.date.available2018-11-07T21:58:34Z
dc.identifierhttps://seer.ufrgs.br/PesquisasemGeociencias/article/view/17939
dc.identifier10.22456/1807-9806.17939
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/2192267
dc.descriptionThe Capané Antiform, located in the northern part of the Neoproterozoic Porongos Metamorphic Complex (RS), is composed of a supracrustal sequence metamorphosed under greenschist (eastern flank) to amphibolite (western flank) facies. Four groups of rocks were recognized. Groups 1 and 2 are constituted of felsic and mafic rocks from the central and western part of the antiform, respectively. They show high LREE and LILE and low HREE and HFSE. The εNd (t) varies from strongly negative (-20) in felsic rocks to moderately negative (-6 to -11) in mafic rocks, with Nd TDM ages that varies from Paleoproterozoic to Mesoproterozoic. The Group 3 consists of metarhyolites from the eastern flank and is geochemically similar to former groups, but shows differences in Nd isotope composition. The εNd(t) is slightly negative (-2 to -4) and the model ages are restricted to the Mesoproterozoic. Group 4, constituted of metabasalts, shows chemical similarities with OIB-MORB and has juvenile isotope signature. The first three groups were interpreted as evolved from a magmatic arc, related probably to the collision of the São Gabriel block with the Encantadas microcontinent during the Neoproterozoic. The Nd differences observed were considered as a result of more or less interaction between mantle and crust components and, particularly, the characteristics observed in the Group 3 can point out a correlation with the syn-tangential granitoids from the eastern part of the Dom Feliciano Belt. The metabasalts of the group 4 were correlated to the antiform's previously described ophiolite remains.pt-BR
dc.descriptionThe Capané Antiform, located in the northern part of the Neoproterozoic Porongos Metamorphic Complex (RS), is composed of a supracrustal sequence metamorphosed under greenschist (eastern flank) to amphibolite (western flank) facies. Four groups of rocks were recognized. Groups 1 and 2 are constituted of felsic and mafic rocks from the central and western part of the antiform, respectively. They show high LREE and LILE and low HREE and HFSE. The εNd (t) varies from strongly negative (-20) in felsic rocks to moderately negative (-6 to -11) in mafic rocks, with Nd TDM ages that varies from Paleoproterozoic to Mesoproterozoic. The Group 3 consists of metarhyolites from the eastern flank and is geochemically similar to former groups, but shows differences in Nd isotope composition. The εNd(t) is slightly negative (-2 to -4) and the model ages are restricted to the Mesoproterozoic. Group 4, constituted of metabasalts, shows chemical similarities with OIB-MORB and has juvenile isotope signature. The first three groups were interpreted as evolved from a magmatic arc, related probably to the collision of the São Gabriel block with the Encantadas microcontinent during the Neoproterozoic. The Nd differences observed were considered as a result of more or less interaction between mantle and crust components and, particularly, the characteristics observed in the Group 3 can point out a correlation with the syn-tangential granitoids from the eastern part of the Dom Feliciano Belt. The metabasalts of the group 4 were correlated to the antiform's previously described ophiolite remains.en-US
dc.formatapplication/pdf
dc.languagepor
dc.publisherInstituto de Geociências /Universidade Federal do Rio Grande do Sulpt-BR
dc.relationhttps://seer.ufrgs.br/PesquisasemGeociencias/article/view/17939/pdf
dc.sourcePesquisas em Geociências; v. 35, n. 2 (2008): Pesquisas em Geociências; 83-95pt-BR
dc.source1807-9806
dc.source1518-2398
dc.subjectpt-BR
dc.subjectpt-BR
dc.subjectGeociênciaspt-BR
dc.subjecten-US
dc.subjectPorongos Metamorphic Complex, metavolcanic rocks, lithochemistry, Sm-Nden-US
dc.titleGeoquímica e Isotópos de Nd de Rochas Metavulcânicas da Antiforme Capané, Complexo Metamórfico Porongos, RSpt-BR
dc.titleGeochemistry and Nd Isotope Composition of Capané Antiform Metavolcanic Rocks, Porongos Metamorphic Complex, RSen-US
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.coverageRio Grande do Sul;Brasilpt-BR
dc.coveragept-BR
dc.coveragept-BR


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