Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean
Autor(a) principal: | |
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Data de Publicação: | 2017 |
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/10400.21/9775 |
Resumo: | The oceanic crustal and uppermost lithospheric mantle structure across the Gloria Fault (GF) transcurrent plate boundary between Africa and Eurasia in the Northeast Atlantic is investigated based on seismic reflection, seismic refraction and wide-angle reflection data. This experiment used 18 ocean bottom stations along an N-S 150 km long traverse together with acquisition of a multichannel seismic reflection profile. Modeling of P and S seismic waves and gravimetric anomalies allowed estimation of P- and S-wave velocities, density, Poisson's ratio and discussion of a compositional model. A five-layer model is proposed in which layers 1-3 correspond to normal sediments through typical oceanic crust layers 2 and 3. Layer 5 yielded mantle velocities above 7.9 km s(-1). Layer 4 with 4 km of thickness has Vp velocities between 7.1 and 7.4 km s(-1) and is clearly separated from typical oceanic crust and mantle layers. Comparison with natural analogues and published lab measurements suggest that layer 4 can be a mix of lithologies that comply with the estimated P and S velocities and computed Poisson's ratio and densities, such as, olivine cumulates, peridotite, gabbro and hydrated mantle. We favour the tectonic process that produces secondary porosity from which results serpentinization due to sea water circulation in fractures. Structural and seismic stratigraphic interpretation of the reflection profile shows that Neogene to recent tectonic deformation on this segment of the plate boundary concentrated on the southern side of the GF, that is, the Africa plate. |
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Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic OceanComposition of the oceanic crustTransform faultsOceanic transform and fracture zone processesCrustal structureAtlantic OceanComposição da crosta oceânicaTransformar falhasEstrutura crustalThe oceanic crustal and uppermost lithospheric mantle structure across the Gloria Fault (GF) transcurrent plate boundary between Africa and Eurasia in the Northeast Atlantic is investigated based on seismic reflection, seismic refraction and wide-angle reflection data. This experiment used 18 ocean bottom stations along an N-S 150 km long traverse together with acquisition of a multichannel seismic reflection profile. Modeling of P and S seismic waves and gravimetric anomalies allowed estimation of P- and S-wave velocities, density, Poisson's ratio and discussion of a compositional model. A five-layer model is proposed in which layers 1-3 correspond to normal sediments through typical oceanic crust layers 2 and 3. Layer 5 yielded mantle velocities above 7.9 km s(-1). Layer 4 with 4 km of thickness has Vp velocities between 7.1 and 7.4 km s(-1) and is clearly separated from typical oceanic crust and mantle layers. Comparison with natural analogues and published lab measurements suggest that layer 4 can be a mix of lithologies that comply with the estimated P and S velocities and computed Poisson's ratio and densities, such as, olivine cumulates, peridotite, gabbro and hydrated mantle. We favour the tectonic process that produces secondary porosity from which results serpentinization due to sea water circulation in fractures. Structural and seismic stratigraphic interpretation of the reflection profile shows that Neogene to recent tectonic deformation on this segment of the plate boundary concentrated on the southern side of the GF, that is, the Africa plate.Oxford University PressRCIPLBatista, LuísHubscher, ChristianTerrinha, PedroMatias, LuísAfilhado, AlexandraLudmann, Thomas2019-03-25T11:14:10Z2017-052017-05-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/9775engBATISTA, Luís; [et al] – Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean. Geophysical Journal International. ISSN 0956-540X. Vol. 209, N.º 2 (2017), pp. 713-7290956-540X10.1093/gji/ggx050metadata 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:RCAAP2023-08-03T09:58:53Zoai:repositorio.ipl.pt:10400.21/9775Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:18:17.069275Repositório 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 |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
spellingShingle |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean Batista, Luís Composition of the oceanic crust Transform faults Oceanic transform and fracture zone processes Crustal structure Atlantic Ocean Composição da crosta oceânica Transformar falhas Estrutura crustal |
title_short |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_full |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_fullStr |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_full_unstemmed |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
title_sort |
Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean |
author |
Batista, Luís |
author_facet |
Batista, Luís Hubscher, Christian Terrinha, Pedro Matias, Luís Afilhado, Alexandra Ludmann, Thomas |
author_role |
author |
author2 |
Hubscher, Christian Terrinha, Pedro Matias, Luís Afilhado, Alexandra Ludmann, Thomas |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Batista, Luís Hubscher, Christian Terrinha, Pedro Matias, Luís Afilhado, Alexandra Ludmann, Thomas |
dc.subject.por.fl_str_mv |
Composition of the oceanic crust Transform faults Oceanic transform and fracture zone processes Crustal structure Atlantic Ocean Composição da crosta oceânica Transformar falhas Estrutura crustal |
topic |
Composition of the oceanic crust Transform faults Oceanic transform and fracture zone processes Crustal structure Atlantic Ocean Composição da crosta oceânica Transformar falhas Estrutura crustal |
description |
The oceanic crustal and uppermost lithospheric mantle structure across the Gloria Fault (GF) transcurrent plate boundary between Africa and Eurasia in the Northeast Atlantic is investigated based on seismic reflection, seismic refraction and wide-angle reflection data. This experiment used 18 ocean bottom stations along an N-S 150 km long traverse together with acquisition of a multichannel seismic reflection profile. Modeling of P and S seismic waves and gravimetric anomalies allowed estimation of P- and S-wave velocities, density, Poisson's ratio and discussion of a compositional model. A five-layer model is proposed in which layers 1-3 correspond to normal sediments through typical oceanic crust layers 2 and 3. Layer 5 yielded mantle velocities above 7.9 km s(-1). Layer 4 with 4 km of thickness has Vp velocities between 7.1 and 7.4 km s(-1) and is clearly separated from typical oceanic crust and mantle layers. Comparison with natural analogues and published lab measurements suggest that layer 4 can be a mix of lithologies that comply with the estimated P and S velocities and computed Poisson's ratio and densities, such as, olivine cumulates, peridotite, gabbro and hydrated mantle. We favour the tectonic process that produces secondary porosity from which results serpentinization due to sea water circulation in fractures. Structural and seismic stratigraphic interpretation of the reflection profile shows that Neogene to recent tectonic deformation on this segment of the plate boundary concentrated on the southern side of the GF, that is, the Africa plate. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-05 2017-05-01T00:00:00Z 2019-03-25T11:14:10Z |
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/10400.21/9775 |
url |
http://hdl.handle.net/10400.21/9775 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
BATISTA, Luís; [et al] – Crustal structure of the Eurasia-Africa plate boundary across the Gloria Fault, North Atlantic Ocean. Geophysical Journal International. ISSN 0956-540X. Vol. 209, N.º 2 (2017), pp. 713-729 0956-540X 10.1093/gji/ggx050 |
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 |
Oxford University Press |
publisher.none.fl_str_mv |
Oxford University Press |
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) |
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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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