Structural characterization of the south portion of the Guarinos Greenstone Belt, GO
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.5327/Z2317-48892013000400004 http://hdl.handle.net/11449/194612 |
Resumo: | Geological mapping in the southern portion of the Guarinos Greenstone Belt in the state of Goias, Brazil, led to the characterization of structural features and recognition of the following lithostratigraphic units: Serra do Cotovelo (meta-ultramafic); Serra Azul (meta-mafic); Unit A (association of meta-ultramafic, meta-mafic, and psamo-pelitic rocks); Cabacal (carbonaceous shales with iron formations and gondites) subdivided into Ca-1, Ca-2, Ca-3 and Ca-4; Aimb, with lower (muscovite-rich banded iron formations) and upper (metapelites associated with iron formations) subunits; and Sao Patricinho (metapelites, subordinately gondites). Metasediments, referred to the Araxa Group in the local literature, unconformably overlie the greenstone sequence. During geological mapping, no structural feature resulting from ductile or brittle deformation (mylonite or breccia) was found at the contact between the so-called Araxa Group metasediments and the Guarinos greenstone belt lithotypes, which suggests that this contact may represent a stratigraphic unconformity and not a thrust fault, as described in the literature. On the basis of structural geometry and superposition criteria, five deformational events covering all units of the greenstone sequence have been characterized: Dn-2 and Dn-1, preceding the main phase (D-n), Dn+1 and Dn+2. The rocks were formed under greenschist facies conditions, from the biotite zone in the south to the garnet zone in the northern area. The minerals that define the metamorphic peak exhibit late to post-Dn growth for both the greenstone metasediments and the Araxa Group indicating that peak metamorphism was coeval in both sequences. |
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Structural characterization of the south portion of the Guarinos Greenstone Belt, GOGuarinos Greenstone Beltstructural geologydeformation phasesGeological mapping in the southern portion of the Guarinos Greenstone Belt in the state of Goias, Brazil, led to the characterization of structural features and recognition of the following lithostratigraphic units: Serra do Cotovelo (meta-ultramafic); Serra Azul (meta-mafic); Unit A (association of meta-ultramafic, meta-mafic, and psamo-pelitic rocks); Cabacal (carbonaceous shales with iron formations and gondites) subdivided into Ca-1, Ca-2, Ca-3 and Ca-4; Aimb, with lower (muscovite-rich banded iron formations) and upper (metapelites associated with iron formations) subunits; and Sao Patricinho (metapelites, subordinately gondites). Metasediments, referred to the Araxa Group in the local literature, unconformably overlie the greenstone sequence. During geological mapping, no structural feature resulting from ductile or brittle deformation (mylonite or breccia) was found at the contact between the so-called Araxa Group metasediments and the Guarinos greenstone belt lithotypes, which suggests that this contact may represent a stratigraphic unconformity and not a thrust fault, as described in the literature. On the basis of structural geometry and superposition criteria, five deformational events covering all units of the greenstone sequence have been characterized: Dn-2 and Dn-1, preceding the main phase (D-n), Dn+1 and Dn+2. The rocks were formed under greenschist facies conditions, from the biotite zone in the south to the garnet zone in the northern area. The minerals that define the metamorphic peak exhibit late to post-Dn growth for both the greenstone metasediments and the Araxa Group indicating that peak metamorphism was coeval in both sequences.Univ Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, Programa Posgrad Geol Reg, Rio Claro, SP, BrazilUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, UNESP, Rio Claro, SP, BrazilUniv Estadual Paulista, UNESP, Inst Geociencias & Ciencias Exatas, Programa Posgrad Geol Reg, Rio Claro, SP, BrazilUniv Estadual Paulista, Inst Geociencias & Ciencias Exatas, UNESP, Rio Claro, SP, BrazilSoc Brasileira GeologiaUniversidade Estadual Paulista (Unesp)Choupina Andrade Silva, Alex Joaquim [UNESP]Amarante Simoes, Luiz Sergio [UNESP]2020-12-10T16:31:44Z2020-12-10T16:31:44Z2013-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article623-638http://dx.doi.org/10.5327/Z2317-48892013000400004Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 4, p. 623-638, 2013.2317-4889http://hdl.handle.net/11449/19461210.5327/Z2317-48892013000400004WOS:000209433500004Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporBrazilian Journal Of Geologyinfo:eu-repo/semantics/openAccess2021-10-22T18:33:23Zoai:repositorio.unesp.br:11449/194612Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-22T18:33:23Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Structural characterization of the south portion of the Guarinos Greenstone Belt, GO |
title |
Structural characterization of the south portion of the Guarinos Greenstone Belt, GO |
spellingShingle |
Structural characterization of the south portion of the Guarinos Greenstone Belt, GO Choupina Andrade Silva, Alex Joaquim [UNESP] Guarinos Greenstone Belt structural geology deformation phases |
title_short |
Structural characterization of the south portion of the Guarinos Greenstone Belt, GO |
title_full |
Structural characterization of the south portion of the Guarinos Greenstone Belt, GO |
title_fullStr |
Structural characterization of the south portion of the Guarinos Greenstone Belt, GO |
title_full_unstemmed |
Structural characterization of the south portion of the Guarinos Greenstone Belt, GO |
title_sort |
Structural characterization of the south portion of the Guarinos Greenstone Belt, GO |
author |
Choupina Andrade Silva, Alex Joaquim [UNESP] |
author_facet |
Choupina Andrade Silva, Alex Joaquim [UNESP] Amarante Simoes, Luiz Sergio [UNESP] |
author_role |
author |
author2 |
Amarante Simoes, Luiz Sergio [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Choupina Andrade Silva, Alex Joaquim [UNESP] Amarante Simoes, Luiz Sergio [UNESP] |
dc.subject.por.fl_str_mv |
Guarinos Greenstone Belt structural geology deformation phases |
topic |
Guarinos Greenstone Belt structural geology deformation phases |
description |
Geological mapping in the southern portion of the Guarinos Greenstone Belt in the state of Goias, Brazil, led to the characterization of structural features and recognition of the following lithostratigraphic units: Serra do Cotovelo (meta-ultramafic); Serra Azul (meta-mafic); Unit A (association of meta-ultramafic, meta-mafic, and psamo-pelitic rocks); Cabacal (carbonaceous shales with iron formations and gondites) subdivided into Ca-1, Ca-2, Ca-3 and Ca-4; Aimb, with lower (muscovite-rich banded iron formations) and upper (metapelites associated with iron formations) subunits; and Sao Patricinho (metapelites, subordinately gondites). Metasediments, referred to the Araxa Group in the local literature, unconformably overlie the greenstone sequence. During geological mapping, no structural feature resulting from ductile or brittle deformation (mylonite or breccia) was found at the contact between the so-called Araxa Group metasediments and the Guarinos greenstone belt lithotypes, which suggests that this contact may represent a stratigraphic unconformity and not a thrust fault, as described in the literature. On the basis of structural geometry and superposition criteria, five deformational events covering all units of the greenstone sequence have been characterized: Dn-2 and Dn-1, preceding the main phase (D-n), Dn+1 and Dn+2. The rocks were formed under greenschist facies conditions, from the biotite zone in the south to the garnet zone in the northern area. The minerals that define the metamorphic peak exhibit late to post-Dn growth for both the greenstone metasediments and the Araxa Group indicating that peak metamorphism was coeval in both sequences. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-12-01 2020-12-10T16:31:44Z 2020-12-10T16:31:44Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.5327/Z2317-48892013000400004 Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 4, p. 623-638, 2013. 2317-4889 http://hdl.handle.net/11449/194612 10.5327/Z2317-48892013000400004 WOS:000209433500004 |
url |
http://dx.doi.org/10.5327/Z2317-48892013000400004 http://hdl.handle.net/11449/194612 |
identifier_str_mv |
Brazilian Journal Of Geology. Sao Paulo: Soc Brasileira Geologia, v. 43, n. 4, p. 623-638, 2013. 2317-4889 10.5327/Z2317-48892013000400004 WOS:000209433500004 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Brazilian Journal Of Geology |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
623-638 |
dc.publisher.none.fl_str_mv |
Soc Brasileira Geologia |
publisher.none.fl_str_mv |
Soc Brasileira Geologia |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
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1803649708099371008 |