Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil
Structural inheritance control of oceanic fracture zone formation by a large basement shear zone during continental breakup is still a matter of debate. In this research, we investigated the reactivation of Precambrian shear zones and their role in the formation of the Ascension and Fernando Poo fra...
Published in: | Marine and Petroleum Geology |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/7e1e81b3-9a6a-4c40-8c1c-fac4d2b85380 2023-05-15T18:21:08+02:00 Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil Vasconcelos, David L. Bezerra, Francisco H.R. Clausen, Ole Rønø Medeiros, Walter E. Castro, David L. de Vital, Helenice Barbosa, José A. 2019-03 https://pure.au.dk/portal/da/publications/inuence-of-precambrian-shear-zones-on-the-formation-of-oceanic-fracture-zones-along-the-continental-margin-of-brazil(7e1e81b3-9a6a-4c40-8c1c-fac4d2b85380).html https://doi.org/10.1016/j.marpetgeo.2018.12.010 eng eng info:eu-repo/semantics/restrictedAccess Vasconcelos , D L , Bezerra , F H R , Clausen , O R , Medeiros , W E , Castro , D L D , Vital , H & Barbosa , J A 2019 , ' Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil ' , Marine and Petroleum Geology , vol. 101 , pp. 322-333 . https://doi.org/10.1016/j.marpetgeo.2018.12.010 Ascencion fracture zone Continental breakup Fernando Poo fracture zone Oceanic fracture zone Shear zone Structural inheritance article 2019 ftuniaarhuspubl https://doi.org/10.1016/j.marpetgeo.2018.12.010 2023-01-18T23:55:43Z Structural inheritance control of oceanic fracture zone formation by a large basement shear zone during continental breakup is still a matter of debate. In this research, we investigated the reactivation of Precambrian shear zones and their role in the formation of the Ascension and Fernando Poo fracture zones during the evolution of the South Atlantic Ocean. We used aeromagnetic and multichannel 2D seismic reflection data associated with previous geological and geophysical data to analyze how the Precambrian shear zones may have influenced the formation of oceanic fracture zones. Our results suggest that the fracture zones are extensions of the shear zones in the transition between continental and oceanic crust. The São Miguel do Aleixo and Pernambuco shear zones were reactivated during the Pangea breakup and acted as zones of weakness controlling the location of the Ascension and Fernando Poo fracture zones during the process of oceanic crust spreading. Our model suggests that the formation of these fracture zones influenced by the shear zones occurred in the early stages of ocean opening. It indicates that the fracture zones that formed in the late opening stages were related to the thermal subsidence stage, as suggested in previous studies. Article in Journal/Newspaper South Atlantic Ocean Aarhus University: Research Marine and Petroleum Geology 101 322 333 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Ascencion fracture zone Continental breakup Fernando Poo fracture zone Oceanic fracture zone Shear zone Structural inheritance |
spellingShingle |
Ascencion fracture zone Continental breakup Fernando Poo fracture zone Oceanic fracture zone Shear zone Structural inheritance Vasconcelos, David L. Bezerra, Francisco H.R. Clausen, Ole Rønø Medeiros, Walter E. Castro, David L. de Vital, Helenice Barbosa, José A. Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil |
topic_facet |
Ascencion fracture zone Continental breakup Fernando Poo fracture zone Oceanic fracture zone Shear zone Structural inheritance |
description |
Structural inheritance control of oceanic fracture zone formation by a large basement shear zone during continental breakup is still a matter of debate. In this research, we investigated the reactivation of Precambrian shear zones and their role in the formation of the Ascension and Fernando Poo fracture zones during the evolution of the South Atlantic Ocean. We used aeromagnetic and multichannel 2D seismic reflection data associated with previous geological and geophysical data to analyze how the Precambrian shear zones may have influenced the formation of oceanic fracture zones. Our results suggest that the fracture zones are extensions of the shear zones in the transition between continental and oceanic crust. The São Miguel do Aleixo and Pernambuco shear zones were reactivated during the Pangea breakup and acted as zones of weakness controlling the location of the Ascension and Fernando Poo fracture zones during the process of oceanic crust spreading. Our model suggests that the formation of these fracture zones influenced by the shear zones occurred in the early stages of ocean opening. It indicates that the fracture zones that formed in the late opening stages were related to the thermal subsidence stage, as suggested in previous studies. |
format |
Article in Journal/Newspaper |
author |
Vasconcelos, David L. Bezerra, Francisco H.R. Clausen, Ole Rønø Medeiros, Walter E. Castro, David L. de Vital, Helenice Barbosa, José A. |
author_facet |
Vasconcelos, David L. Bezerra, Francisco H.R. Clausen, Ole Rønø Medeiros, Walter E. Castro, David L. de Vital, Helenice Barbosa, José A. |
author_sort |
Vasconcelos, David L. |
title |
Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil |
title_short |
Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil |
title_full |
Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil |
title_fullStr |
Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil |
title_full_unstemmed |
Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil |
title_sort |
influence of precambrian shear zones on the formation of oceanic fracture zones along the continental margin of brazil |
publishDate |
2019 |
url |
https://pure.au.dk/portal/da/publications/inuence-of-precambrian-shear-zones-on-the-formation-of-oceanic-fracture-zones-along-the-continental-margin-of-brazil(7e1e81b3-9a6a-4c40-8c1c-fac4d2b85380).html https://doi.org/10.1016/j.marpetgeo.2018.12.010 |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
Vasconcelos , D L , Bezerra , F H R , Clausen , O R , Medeiros , W E , Castro , D L D , Vital , H & Barbosa , J A 2019 , ' Influence of Precambrian shear zones on the formation of oceanic fracture zones along the continental margin of Brazil ' , Marine and Petroleum Geology , vol. 101 , pp. 322-333 . https://doi.org/10.1016/j.marpetgeo.2018.12.010 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2018.12.010 |
container_title |
Marine and Petroleum Geology |
container_volume |
101 |
container_start_page |
322 |
op_container_end_page |
333 |
_version_ |
1766200255741689856 |