Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/232986 |
Resumo: | The study area is located in the southwest of Minas Gerais state, north of the Guaxupé city and in the vicinity of the Santa Cruz do Prata district (Guaranésia municipality), a region affected by the Varginha Shear Zone. It is constituted of lithotypes attributed to the Araxá Group, placed in a suture zone of crustal blocks, and amalgamated during the Brazilian orogenesis in Neoproterozoic (Alterosa Suture Zone). In this region, the Araxá Group is composed of pelitic to psamo-pelitic metasediments with orthogneisses, metamafic and metaultramafic rocks intercalations. Interleaved with these lithotypes, it was described high pressure metamafic rocks occurrences with symplectic and coronitic textures which were interpreted as retroeclogites. In this paper are presented petrographic, mineral chemistry and geothermobarometric data obtained in retroeclogite. The geothermobarometry results by trace elements (Zr-in-rutile and Ti-in-quartz) indicate older metamorphic rebalancing conditions in eclogite facies, with temperature of 763°C and pressure of 14.4 kbar. The rebalancing conditions in upper amphibolite facies, calculated by the THERMOCALC software, are 12.5 ±0.8 kbar and 799 ±37 °C. The textural and mineralogical data, combined with geothermobarometric data, suggest a clockwise P-T-t path associated to near isothermal decompression. The results are compatible with continental collision zones with crustal thickening. |
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Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais statePetrografia, química mineral e geotermobarometria de retroeclogito no grupo araxá na região da zona de cisalhamento varginha, sudoeste de minas geraisAlterosa suture zoneEclogite faciesSouthern brasília beltVarginha shear zoneThe study area is located in the southwest of Minas Gerais state, north of the Guaxupé city and in the vicinity of the Santa Cruz do Prata district (Guaranésia municipality), a region affected by the Varginha Shear Zone. It is constituted of lithotypes attributed to the Araxá Group, placed in a suture zone of crustal blocks, and amalgamated during the Brazilian orogenesis in Neoproterozoic (Alterosa Suture Zone). In this region, the Araxá Group is composed of pelitic to psamo-pelitic metasediments with orthogneisses, metamafic and metaultramafic rocks intercalations. Interleaved with these lithotypes, it was described high pressure metamafic rocks occurrences with symplectic and coronitic textures which were interpreted as retroeclogites. In this paper are presented petrographic, mineral chemistry and geothermobarometric data obtained in retroeclogite. The geothermobarometry results by trace elements (Zr-in-rutile and Ti-in-quartz) indicate older metamorphic rebalancing conditions in eclogite facies, with temperature of 763°C and pressure of 14.4 kbar. The rebalancing conditions in upper amphibolite facies, calculated by the THERMOCALC software, are 12.5 ±0.8 kbar and 799 ±37 °C. The textural and mineralogical data, combined with geothermobarometric data, suggest a clockwise P-T-t path associated to near isothermal decompression. The results are compatible with continental collision zones with crustal thickening.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Pós-Graduação em Geociências e Meio Ambiente Instituto de Geociências e Ciências Exatas Universidade Estadual PaulistaInstituto de Geociências e Ciências Exatas Universidade Estadual PaulistaPós-Graduação em Geociências e Meio Ambiente Instituto de Geociências e Ciências Exatas Universidade Estadual PaulistaInstituto de Geociências e Ciências Exatas Universidade Estadual PaulistaUniversidade Estadual Paulista (UNESP)Leme, Thaís Güitzlaf [UNESP]Navarro, Guillermo Rafael Beltran [UNESP]Zanardo, Antenor [UNESP]Montibeller, Cibele Carolina [UNESP]2022-04-30T23:09:32Z2022-04-30T23:09:32Z2020-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article297-313Geociencias, v. 38, n. 2, p. 297-313, 2020.1980-900X0101-9082http://hdl.handle.net/11449/2329862-s2.0-85083712656Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporGeocienciasinfo:eu-repo/semantics/openAccess2022-04-30T23:09:32Zoai:repositorio.unesp.br:11449/232986Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:31:45.270764Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state Petrografia, química mineral e geotermobarometria de retroeclogito no grupo araxá na região da zona de cisalhamento varginha, sudoeste de minas gerais |
title |
Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state |
spellingShingle |
Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state Leme, Thaís Güitzlaf [UNESP] Alterosa suture zone Eclogite facies Southern brasília belt Varginha shear zone |
title_short |
Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state |
title_full |
Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state |
title_fullStr |
Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state |
title_full_unstemmed |
Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state |
title_sort |
Petrography, mineral chemistry and geothermobarometry of retroeclogite of araxá group from varginha shear zone region, southwest of minas gerais state |
author |
Leme, Thaís Güitzlaf [UNESP] |
author_facet |
Leme, Thaís Güitzlaf [UNESP] Navarro, Guillermo Rafael Beltran [UNESP] Zanardo, Antenor [UNESP] Montibeller, Cibele Carolina [UNESP] |
author_role |
author |
author2 |
Navarro, Guillermo Rafael Beltran [UNESP] Zanardo, Antenor [UNESP] Montibeller, Cibele Carolina [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Leme, Thaís Güitzlaf [UNESP] Navarro, Guillermo Rafael Beltran [UNESP] Zanardo, Antenor [UNESP] Montibeller, Cibele Carolina [UNESP] |
dc.subject.por.fl_str_mv |
Alterosa suture zone Eclogite facies Southern brasília belt Varginha shear zone |
topic |
Alterosa suture zone Eclogite facies Southern brasília belt Varginha shear zone |
description |
The study area is located in the southwest of Minas Gerais state, north of the Guaxupé city and in the vicinity of the Santa Cruz do Prata district (Guaranésia municipality), a region affected by the Varginha Shear Zone. It is constituted of lithotypes attributed to the Araxá Group, placed in a suture zone of crustal blocks, and amalgamated during the Brazilian orogenesis in Neoproterozoic (Alterosa Suture Zone). In this region, the Araxá Group is composed of pelitic to psamo-pelitic metasediments with orthogneisses, metamafic and metaultramafic rocks intercalations. Interleaved with these lithotypes, it was described high pressure metamafic rocks occurrences with symplectic and coronitic textures which were interpreted as retroeclogites. In this paper are presented petrographic, mineral chemistry and geothermobarometric data obtained in retroeclogite. The geothermobarometry results by trace elements (Zr-in-rutile and Ti-in-quartz) indicate older metamorphic rebalancing conditions in eclogite facies, with temperature of 763°C and pressure of 14.4 kbar. The rebalancing conditions in upper amphibolite facies, calculated by the THERMOCALC software, are 12.5 ±0.8 kbar and 799 ±37 °C. The textural and mineralogical data, combined with geothermobarometric data, suggest a clockwise P-T-t path associated to near isothermal decompression. The results are compatible with continental collision zones with crustal thickening. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-01-01 2022-04-30T23:09:32Z 2022-04-30T23:09:32Z |
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 |
Geociencias, v. 38, n. 2, p. 297-313, 2020. 1980-900X 0101-9082 http://hdl.handle.net/11449/232986 2-s2.0-85083712656 |
identifier_str_mv |
Geociencias, v. 38, n. 2, p. 297-313, 2020. 1980-900X 0101-9082 2-s2.0-85083712656 |
url |
http://hdl.handle.net/11449/232986 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Geociencias |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
297-313 |
dc.source.none.fl_str_mv |
Scopus 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 |
|
_version_ |
1808129331618119680 |