Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil)
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/0370-44672020730043 http://hdl.handle.net/11449/205242 |
Resumo: | The Guacuí and Batatal lineaments in the southern region of the state of Es-pírito Santo (southeastern Brazil) can be traced from satellite images for tens of kilometers. They are considered shear zones associated to the final tectonic stages of the Araçuaí-West Congo (A-WC) Orogen during the Ediacaran-Cambrian period. In order to understand their nature and tectonic implications for the development of the orogeny, we integrated geological and structural data based on fieldwork and detailed microstructural analysis. Data was collected along two profiles located at the central segments of both structures. The results demonstrated that the Guaçuí shear zone (GSZ) is a typical ductile transpressive shear zone with approximately 9 km width that shows numerous dextral kinematic indicators and records meta-morphism of upper amphibolite facies. The GSZ shows different levels of intensity of dynamic deformation. The Batatal shear zone (BSZ) is a narrow brittle shear zone that shows essentially brittle microstructures (intercrystalline microfractures) revealing deformation at low-grade conditions (frictional regime). Based on their characteristics and the level of erosion of the rocks exposed in the region, we inter-pret that GSZ developed prior to BSZ. |
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Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil)Araçuaí orogenDeformationMicrofracturesMylonitesShear zonesThe Guacuí and Batatal lineaments in the southern region of the state of Es-pírito Santo (southeastern Brazil) can be traced from satellite images for tens of kilometers. They are considered shear zones associated to the final tectonic stages of the Araçuaí-West Congo (A-WC) Orogen during the Ediacaran-Cambrian period. In order to understand their nature and tectonic implications for the development of the orogeny, we integrated geological and structural data based on fieldwork and detailed microstructural analysis. Data was collected along two profiles located at the central segments of both structures. The results demonstrated that the Guaçuí shear zone (GSZ) is a typical ductile transpressive shear zone with approximately 9 km width that shows numerous dextral kinematic indicators and records meta-morphism of upper amphibolite facies. The GSZ shows different levels of intensity of dynamic deformation. The Batatal shear zone (BSZ) is a narrow brittle shear zone that shows essentially brittle microstructures (intercrystalline microfractures) revealing deformation at low-grade conditions (frictional regime). Based on their characteristics and the level of erosion of the rocks exposed in the region, we inter-pret that GSZ developed prior to BSZ.Universidade Federal do Espírito Santo-UFES Departamento de Geologia Centro de Ciências Naturais e da SaúdeUniversidade Estadual Paulista-UNESP Departamento de Geologia Instituto de Geociências e Ciências ExatasUniversidade Estadual Paulista-UNESP Departamento de Geologia Instituto de Geociências e Ciências ExatasUniversidade Federal do Espírito Santo (UFES)Universidade Estadual Paulista (Unesp)Hartwig, Marcos Eduardode Melo, Marilane GonzagaMoreira, César Augusto [UNESP]2021-06-25T10:12:09Z2021-06-25T10:12:09Z2020-10-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article499-512application/pdfhttp://dx.doi.org/10.1590/0370-44672020730043REM - International Engineering Journal., v. 73, n. 4, p. 499-512, 2020.2448-167Xhttp://hdl.handle.net/11449/20524210.1590/0370-44672020730043S2448-167X20200004004992-s2.0-85091865983S2448-167X2020000400499.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengREM - International Engineering Journal.info:eu-repo/semantics/openAccess2023-10-19T06:03:10Zoai:repositorio.unesp.br:11449/205242Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T15:16:32.391394Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil) |
title |
Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil) |
spellingShingle |
Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil) Hartwig, Marcos Eduardo Araçuaí orogen Deformation Microfractures Mylonites Shear zones |
title_short |
Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil) |
title_full |
Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil) |
title_fullStr |
Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil) |
title_full_unstemmed |
Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil) |
title_sort |
Structure and tectonic significance of high-and low-temperature deformation along the lateral escape-related guaçuí and batatal shear zones, Southern Araçuaí Orogen (Southeastern Brazil) |
author |
Hartwig, Marcos Eduardo |
author_facet |
Hartwig, Marcos Eduardo de Melo, Marilane Gonzaga Moreira, César Augusto [UNESP] |
author_role |
author |
author2 |
de Melo, Marilane Gonzaga Moreira, César Augusto [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Federal do Espírito Santo (UFES) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Hartwig, Marcos Eduardo de Melo, Marilane Gonzaga Moreira, César Augusto [UNESP] |
dc.subject.por.fl_str_mv |
Araçuaí orogen Deformation Microfractures Mylonites Shear zones |
topic |
Araçuaí orogen Deformation Microfractures Mylonites Shear zones |
description |
The Guacuí and Batatal lineaments in the southern region of the state of Es-pírito Santo (southeastern Brazil) can be traced from satellite images for tens of kilometers. They are considered shear zones associated to the final tectonic stages of the Araçuaí-West Congo (A-WC) Orogen during the Ediacaran-Cambrian period. In order to understand their nature and tectonic implications for the development of the orogeny, we integrated geological and structural data based on fieldwork and detailed microstructural analysis. Data was collected along two profiles located at the central segments of both structures. The results demonstrated that the Guaçuí shear zone (GSZ) is a typical ductile transpressive shear zone with approximately 9 km width that shows numerous dextral kinematic indicators and records meta-morphism of upper amphibolite facies. The GSZ shows different levels of intensity of dynamic deformation. The Batatal shear zone (BSZ) is a narrow brittle shear zone that shows essentially brittle microstructures (intercrystalline microfractures) revealing deformation at low-grade conditions (frictional regime). Based on their characteristics and the level of erosion of the rocks exposed in the region, we inter-pret that GSZ developed prior to BSZ. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-10-01 2021-06-25T10:12:09Z 2021-06-25T10:12:09Z |
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/10.1590/0370-44672020730043 REM - International Engineering Journal., v. 73, n. 4, p. 499-512, 2020. 2448-167X http://hdl.handle.net/11449/205242 10.1590/0370-44672020730043 S2448-167X2020000400499 2-s2.0-85091865983 S2448-167X2020000400499.pdf |
url |
http://dx.doi.org/10.1590/0370-44672020730043 http://hdl.handle.net/11449/205242 |
identifier_str_mv |
REM - International Engineering Journal., v. 73, n. 4, p. 499-512, 2020. 2448-167X 10.1590/0370-44672020730043 S2448-167X2020000400499 2-s2.0-85091865983 S2448-167X2020000400499.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
REM - International Engineering Journal. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
499-512 application/pdf |
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_ |
1808128492693356544 |