Deep structure of the Santos basin-São Paulo plateau system, SE Brazil
Autor(a) principal: | |
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Data de Publicação: | 2015 |
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/10400.21/5709 |
Resumo: | The structure and nature of the crust underlying the Santos Basin-São Paulo Plateau System (SSPS), in the SE Brazilian margin, are discussed based on five wide-angle seismic profiles acquired during the Santos Basin (SanBa) experiment in 2011. Velocity models allow us to precisely divide the SSPS in six domains from unthinned continental crust (Domain CC) to normal oceanic crust (Domain OC). A seventh domain (Domain D), a triangular shape region in the SE of the SSPS, is discussed by Klingelhoefer et al. (2014). Beneath the continental shelf, a similar to 100km wide necking zone (Domain N) is imaged where the continental crust thins abruptly from similar to 40km to less than 15km. Toward the ocean, most of the SSPS (Domains A and C) shows velocity ranges, velocity gradients, and a Moho interface characteristic of the thinned continental crust. The central domain (Domain B) has, however, a very heterogeneous structure. While its southwestern part still exhibits extremely thinned (7km) continental crust, its northeastern part depicts a 2-4km thick upper layer (6.0-6.5km/s) overlying an anomalous velocity layer (7.0-7.8km/s) and no evidence of a Moho interface. This structure is interpreted as atypical oceanic crust, exhumed lower crust, or upper continental crust intruded by mafic material, overlying either altered mantle in the first two cases or intruded lower continental crust in the last case. The deep structure and v-shaped segmentation of the SSPS confirm that an initial episode of rifting occurred there obliquely to the general opening direction of the South Atlantic Central Segment. |
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Deep structure of the Santos basin-São Paulo plateau system, SE BrazilSantos BasinSão Paulo PlateauCrustal structureWide-angle seismicThe structure and nature of the crust underlying the Santos Basin-São Paulo Plateau System (SSPS), in the SE Brazilian margin, are discussed based on five wide-angle seismic profiles acquired during the Santos Basin (SanBa) experiment in 2011. Velocity models allow us to precisely divide the SSPS in six domains from unthinned continental crust (Domain CC) to normal oceanic crust (Domain OC). A seventh domain (Domain D), a triangular shape region in the SE of the SSPS, is discussed by Klingelhoefer et al. (2014). Beneath the continental shelf, a similar to 100km wide necking zone (Domain N) is imaged where the continental crust thins abruptly from similar to 40km to less than 15km. Toward the ocean, most of the SSPS (Domains A and C) shows velocity ranges, velocity gradients, and a Moho interface characteristic of the thinned continental crust. The central domain (Domain B) has, however, a very heterogeneous structure. While its southwestern part still exhibits extremely thinned (7km) continental crust, its northeastern part depicts a 2-4km thick upper layer (6.0-6.5km/s) overlying an anomalous velocity layer (7.0-7.8km/s) and no evidence of a Moho interface. This structure is interpreted as atypical oceanic crust, exhumed lower crust, or upper continental crust intruded by mafic material, overlying either altered mantle in the first two cases or intruded lower continental crust in the last case. The deep structure and v-shaped segmentation of the SSPS confirm that an initial episode of rifting occurred there obliquely to the general opening direction of the South Atlantic Central Segment.Amer Geophysical UnionRCIPLEvain, M.Afilhado, AlexandraRigoti, C.Loureiro, A.Alves, D.Klingelhoefer, FraukeSchnurle, PhilippeFeld, AurelieFuck, RSoares, J.Lima, M. Vinicius deCorela, C.Matias, LuísBenabdellouahed, M.Baltzer, A.Rabineau, MarinaViana, A.Moulin, MarylineAslanian, Daniel2016-02-23T15:30:10Z2015-082015-08-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/5709engEVAIN, M; [et al.] - Deep structure of the Santos basin-São Paulo plateau system, SE Brazil. Journal of Geopgysical Research-Solid Earth. ISSN. 2169-9313. Vol. 120, N.º 8 (2015), pp. 5401-54312169-931310.1002/2014JB011561metadata only accessinfo: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:RCAAP2023-08-03T09:49:31Zoai:repositorio.ipl.pt:10400.21/5709Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:14:57.481382Repositório 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 |
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil |
title |
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil |
spellingShingle |
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil Evain, M. Santos Basin São Paulo Plateau Crustal structure Wide-angle seismic |
title_short |
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil |
title_full |
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil |
title_fullStr |
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil |
title_full_unstemmed |
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil |
title_sort |
Deep structure of the Santos basin-São Paulo plateau system, SE Brazil |
author |
Evain, M. |
author_facet |
Evain, M. Afilhado, Alexandra Rigoti, C. Loureiro, A. Alves, D. Klingelhoefer, Frauke Schnurle, Philippe Feld, Aurelie Fuck, R Soares, J. Lima, M. Vinicius de Corela, C. Matias, Luís Benabdellouahed, M. Baltzer, A. Rabineau, Marina Viana, A. Moulin, Maryline Aslanian, Daniel |
author_role |
author |
author2 |
Afilhado, Alexandra Rigoti, C. Loureiro, A. Alves, D. Klingelhoefer, Frauke Schnurle, Philippe Feld, Aurelie Fuck, R Soares, J. Lima, M. Vinicius de Corela, C. Matias, Luís Benabdellouahed, M. Baltzer, A. Rabineau, Marina Viana, A. Moulin, Maryline Aslanian, Daniel |
author2_role |
author author author author author author author author author author author author author author author author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Evain, M. Afilhado, Alexandra Rigoti, C. Loureiro, A. Alves, D. Klingelhoefer, Frauke Schnurle, Philippe Feld, Aurelie Fuck, R Soares, J. Lima, M. Vinicius de Corela, C. Matias, Luís Benabdellouahed, M. Baltzer, A. Rabineau, Marina Viana, A. Moulin, Maryline Aslanian, Daniel |
dc.subject.por.fl_str_mv |
Santos Basin São Paulo Plateau Crustal structure Wide-angle seismic |
topic |
Santos Basin São Paulo Plateau Crustal structure Wide-angle seismic |
description |
The structure and nature of the crust underlying the Santos Basin-São Paulo Plateau System (SSPS), in the SE Brazilian margin, are discussed based on five wide-angle seismic profiles acquired during the Santos Basin (SanBa) experiment in 2011. Velocity models allow us to precisely divide the SSPS in six domains from unthinned continental crust (Domain CC) to normal oceanic crust (Domain OC). A seventh domain (Domain D), a triangular shape region in the SE of the SSPS, is discussed by Klingelhoefer et al. (2014). Beneath the continental shelf, a similar to 100km wide necking zone (Domain N) is imaged where the continental crust thins abruptly from similar to 40km to less than 15km. Toward the ocean, most of the SSPS (Domains A and C) shows velocity ranges, velocity gradients, and a Moho interface characteristic of the thinned continental crust. The central domain (Domain B) has, however, a very heterogeneous structure. While its southwestern part still exhibits extremely thinned (7km) continental crust, its northeastern part depicts a 2-4km thick upper layer (6.0-6.5km/s) overlying an anomalous velocity layer (7.0-7.8km/s) and no evidence of a Moho interface. This structure is interpreted as atypical oceanic crust, exhumed lower crust, or upper continental crust intruded by mafic material, overlying either altered mantle in the first two cases or intruded lower continental crust in the last case. The deep structure and v-shaped segmentation of the SSPS confirm that an initial episode of rifting occurred there obliquely to the general opening direction of the South Atlantic Central Segment. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-08 2015-08-01T00:00:00Z 2016-02-23T15:30:10Z |
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/10400.21/5709 |
url |
http://hdl.handle.net/10400.21/5709 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
EVAIN, M; [et al.] - Deep structure of the Santos basin-São Paulo plateau system, SE Brazil. Journal of Geopgysical Research-Solid Earth. ISSN. 2169-9313. Vol. 120, N.º 8 (2015), pp. 5401-5431 2169-9313 10.1002/2014JB011561 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Amer Geophysical Union |
publisher.none.fl_str_mv |
Amer Geophysical Union |
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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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