Please use this identifier to cite or link to this item: https://repositorio.ufba.br/handle/ri/5166
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSilva, Fernando César Alves da-
dc.contributor.authorChauvet, A.-
dc.contributor.authorFaure, M.-
dc.contributor.authorGuerrot, C.-
dc.creatorSilva, Fernando César Alves da-
dc.creatorChauvet, A.-
dc.creatorFaure, M.-
dc.creatorGuerrot, C.-
dc.date.accessioned2012-01-13T11:03:56Z-
dc.date.available2012-01-13T11:03:56Z-
dc.date.issued1997-
dc.identifier.issn0301-9268-
dc.identifier.urihttp://www.repositorio.ufba.br/ri/handle/ri/5166-
dc.descriptionp.139-162pt_BR
dc.description.abstractThe Paleoproterozoic structural evolution of the Rio Itapicuru greenstone belt (RIGB, Bahia, Brazil) involves two tectonic events of different natures, both associated with magmatism. The first event (D1) developed in response to NW-SE shortening and was responsible for subhorizontal foliation, NW-SE trending lineation and SE-directed thrusts. D1 was coeval with the emplacement of rare 2130 Ma granodioritic plutons. The D2 tectonic event was characterized by left-lateral strike-slip tectonics, developed on steeply dipping D1 foliation and within numerous N-S elongated ca 2080 Ma plutons. Quartz c-axis analysis within the granites shows that they experienced progressive leftlateral shearing from magmatic to solid-state conditions under decreasing temperatures. This fact, in addition to microstructural arguments, indicates syntectonic emplacement of these plutons. A zone of maximum deformation (the Main Shear Zone) has been identified in the centre of the RIGB on the basis of strain measurements. A tectonic model in which D1 thrusting event initiated basin closure before being replaced by D2 strike-slip motion is proposed. The Main Shear Zone corresponds successively to the main thrust zone and the main wrench fault during D1 and D2 events, respectively. Such a switch from orogen-normal thrusts to orogen-parallel transcurrent movements may represent a common progression during evolution of mountain belts in order to accommodate excess crustal thickness. However, because low-grade metamorphism and low intensity of the deformation demonstrate that excess crustal thickness was not attained, it is argued that granite emplacement and ascent played a significant role in triggering strike-slip tectonics in the RIGB.pt_BR
dc.description.provenanceSubmitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2012-01-13T11:03:56Z No. of bitstreams: 1 s2.0-S0301926897000247-main.pdf: 2123249 bytes, checksum: c015d932e68b66d73274d6b50930ad54 (MD5)en
dc.description.provenanceMade available in DSpace on 2012-01-13T11:03:56Z (GMT). No. of bitstreams: 1 s2.0-S0301926897000247-main.pdf: 2123249 bytes, checksum: c015d932e68b66d73274d6b50930ad54 (MD5) Previous issue date: 1997en
dc.language.isoenpt_BR
dc.subjectBrazilpt_BR
dc.subjectGreenstone beltspt_BR
dc.subjectPaleoproterozoicpt_BR
dc.subjectQuartz fabricspt_BR
dc.subjectStrainpt_BR
dc.subjectSyntectonic granitept_BR
dc.titleStructural evolution of the Paleoproterozoic Rio Itapicuru granite-greenstone belt (Bahia, Brazil): the role of synkinematic plutons in the regional tectonicspt_BR
dc.title.alternativePrecambrian Researchpt_BR
dc.typeArtigo de Periódicopt_BR
dc.identifier.numberv. 84pt_BR
Appears in Collections:Artigos Publicados em Periódicos (IGEO)

Files in This Item:
File Description SizeFormat 
s2.0-S0301926897000247-main.pdf2,07 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.