Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes
Autor(a) principal: | |
---|---|
Data de Publicação: | 2014 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/35719 |
Resumo: | The folding laws control the process responsible for the genesis and the initial morphological evolution of shearband boudins. In this model, the generation of boudins begins with folding of tabular competent veins of different thickness immersed in a less competent matrix. Veins thicker than a given critical value form initial asymmetric open folds that evolve by asymmetric antithetical rotation and later by an internal mass redistribution with translation along the interface vein-matrix. On the other side, the veins thinner than the critical value follow the folding process until it culminates with the coalescence and stacking of the folds. By this mechanism the critical thickness is reached and these bodies are prone to suffer a new phase of boudinage similar to that followed by the originally thicker veins. Therefore, all deformed tabular veins, embedded in a ductile matrix, converge to classical shearband boudin morphology, independently from their original thickness. |
id |
RCAP_087279e2e0c407a63278eabb57449e70 |
---|---|
oai_identifier_str |
oai:repositorium.sdum.uminho.pt:1822/35719 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranesFoldingAsymmetrical boudinageFold boudinSynthetic shear planesPlegamiento“Boudinage” asimétricoPliegue-“boudin”Planos de cizalla sintéticosCiências Naturais::Ciências da Terra e do AmbienteThe folding laws control the process responsible for the genesis and the initial morphological evolution of shearband boudins. In this model, the generation of boudins begins with folding of tabular competent veins of different thickness immersed in a less competent matrix. Veins thicker than a given critical value form initial asymmetric open folds that evolve by asymmetric antithetical rotation and later by an internal mass redistribution with translation along the interface vein-matrix. On the other side, the veins thinner than the critical value follow the folding process until it culminates with the coalescence and stacking of the folds. By this mechanism the critical thickness is reached and these bodies are prone to suffer a new phase of boudinage similar to that followed by the originally thicker veins. Therefore, all deformed tabular veins, embedded in a ductile matrix, converge to classical shearband boudin morphology, independently from their original thickness.La génesis y evolución morfológica inicial de los "boudins” de tipo “shearband" están controlados por mecanismos de plegamiento. En este modelo, el "boudinage" comienza con el plegamiento de cuerpos tabulares (venas) de diferentes espesores, inmersos en una matriz menos competente. Las venas más gruesas exceden un espesor crítico que determina la formación inicial de un pliegue abierto. Posteriormente evoluciona por rotación antitética en relación con la cinemática de la zona de cizalla y por traslación de masa a lo largo de la interfase vena-matriz,conduciendo a la morfología clásica de un "shearband boudin”. Por su parte, los cuerpos comparativamente más delgados continúan plegándose hasta que se produce la unión y apilamiento de los flancos de los pliegues (“stacked-folds”). Mediante este proceso se alcanza el espesor crítico necesario para que se desarrolle una nueva fase de "boudinage" similar a la seguida por las venas gruesas.Sociedad Geológica de EspañaUniversidade do MinhoPamplona, J.Rodrigues, Benedito C.Fernández, Carlos20142014-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/35719enginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:49:22Zoai:repositorium.sdum.uminho.pt:1822/35719Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:47:49.471264Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes |
title |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes |
spellingShingle |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes Pamplona, J. Folding Asymmetrical boudinage Fold boudin Synthetic shear planes Plegamiento “Boudinage” asimétrico Pliegue-“boudin” Planos de cizalla sintéticos Ciências Naturais::Ciências da Terra e do Ambiente |
title_short |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes |
title_full |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes |
title_fullStr |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes |
title_full_unstemmed |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes |
title_sort |
Folding as a precursor of asymmetric boudinage in shear zones affecting migmatitic terranes |
author |
Pamplona, J. |
author_facet |
Pamplona, J. Rodrigues, Benedito C. Fernández, Carlos |
author_role |
author |
author2 |
Rodrigues, Benedito C. Fernández, Carlos |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Pamplona, J. Rodrigues, Benedito C. Fernández, Carlos |
dc.subject.por.fl_str_mv |
Folding Asymmetrical boudinage Fold boudin Synthetic shear planes Plegamiento “Boudinage” asimétrico Pliegue-“boudin” Planos de cizalla sintéticos Ciências Naturais::Ciências da Terra e do Ambiente |
topic |
Folding Asymmetrical boudinage Fold boudin Synthetic shear planes Plegamiento “Boudinage” asimétrico Pliegue-“boudin” Planos de cizalla sintéticos Ciências Naturais::Ciências da Terra e do Ambiente |
description |
The folding laws control the process responsible for the genesis and the initial morphological evolution of shearband boudins. In this model, the generation of boudins begins with folding of tabular competent veins of different thickness immersed in a less competent matrix. Veins thicker than a given critical value form initial asymmetric open folds that evolve by asymmetric antithetical rotation and later by an internal mass redistribution with translation along the interface vein-matrix. On the other side, the veins thinner than the critical value follow the folding process until it culminates with the coalescence and stacking of the folds. By this mechanism the critical thickness is reached and these bodies are prone to suffer a new phase of boudinage similar to that followed by the originally thicker veins. Therefore, all deformed tabular veins, embedded in a ductile matrix, converge to classical shearband boudin morphology, independently from their original thickness. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014 2014-01-01T00:00:00Z |
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://hdl.handle.net/1822/35719 |
url |
http://hdl.handle.net/1822/35719 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Sociedad Geológica de España |
publisher.none.fl_str_mv |
Sociedad Geológica de España |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
_version_ |
1799133053285564416 |