Post‐Jurassic brittle deformation of Lusitanian Basin in the context of W Iberia evolution
Abstract A detailed structural analysis of the fracture network exposed in the Jurassic strata is used to reconstruct the Lusitanian Basin's brittle tectonic history related to the Meso‐Cenozoic paleostress trajectories of the Iberian plate. Structural analysis is made by high‐resolution virtua...
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crwiley:10.1111/bre.12794 2024-06-02T08:11:27+00:00 Post‐Jurassic brittle deformation of Lusitanian Basin in the context of W Iberia evolution Kumaira, Sissa Guadagnin, Felipe Magalhães, Antonio J. C. Pimentel, Nuno L. A. Chemale, Farid Conselho Nacional de Desenvolvimento Científico e Tecnológico 2023 http://dx.doi.org/10.1111/bre.12794 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12794 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Basin Research volume 35, issue 6, page 2165-2192 ISSN 0950-091X 1365-2117 journal-article 2023 crwiley https://doi.org/10.1111/bre.12794 2024-05-03T11:18:28Z Abstract A detailed structural analysis of the fracture network exposed in the Jurassic strata is used to reconstruct the Lusitanian Basin's brittle tectonic history related to the Meso‐Cenozoic paleostress trajectories of the Iberian plate. Structural analysis is made by high‐resolution virtual outcrop models and orthophoto mosaics, along with information obtained in the field. The paleostress regime is determined based on the fault‐slip inversion method. Structural features are predominantly NNE‐SSW, NE‐SW and NW‐SE‐trending extensional fractures, including joints, veins, normal faults, and ~E‐W‐oriented strike‐slip faults. These structures remained active in the early basin evolution and were repeatedly reactivated by shearing and contraction. The chronological succession and paleostress reconstruction revealed three tectonic regimes (i) NE‐oriented extension, (ii) NE‐oriented strike‐slip and (iii) NW‐shortening. The first stress regime was driven by the North Atlantic rift propagation in the Iberia's west and northwest margins in the Late Jurassic–Early Cretaceous. The younger stress states involve reactivation and inversion of pre‐existing fractures by Africa–Europe convergence since the Late Cretaceous. The findings are consistent with the regional stress field which the Iberian plate has experienced since the Meso‐Cenozoic. Article in Journal/Newspaper North Atlantic Wiley Online Library Basin Research 35 6 2165 2192 |
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English |
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Abstract A detailed structural analysis of the fracture network exposed in the Jurassic strata is used to reconstruct the Lusitanian Basin's brittle tectonic history related to the Meso‐Cenozoic paleostress trajectories of the Iberian plate. Structural analysis is made by high‐resolution virtual outcrop models and orthophoto mosaics, along with information obtained in the field. The paleostress regime is determined based on the fault‐slip inversion method. Structural features are predominantly NNE‐SSW, NE‐SW and NW‐SE‐trending extensional fractures, including joints, veins, normal faults, and ~E‐W‐oriented strike‐slip faults. These structures remained active in the early basin evolution and were repeatedly reactivated by shearing and contraction. The chronological succession and paleostress reconstruction revealed three tectonic regimes (i) NE‐oriented extension, (ii) NE‐oriented strike‐slip and (iii) NW‐shortening. The first stress regime was driven by the North Atlantic rift propagation in the Iberia's west and northwest margins in the Late Jurassic–Early Cretaceous. The younger stress states involve reactivation and inversion of pre‐existing fractures by Africa–Europe convergence since the Late Cretaceous. The findings are consistent with the regional stress field which the Iberian plate has experienced since the Meso‐Cenozoic. |
author2 |
Conselho Nacional de Desenvolvimento Científico e Tecnológico |
format |
Article in Journal/Newspaper |
author |
Kumaira, Sissa Guadagnin, Felipe Magalhães, Antonio J. C. Pimentel, Nuno L. A. Chemale, Farid |
spellingShingle |
Kumaira, Sissa Guadagnin, Felipe Magalhães, Antonio J. C. Pimentel, Nuno L. A. Chemale, Farid Post‐Jurassic brittle deformation of Lusitanian Basin in the context of W Iberia evolution |
author_facet |
Kumaira, Sissa Guadagnin, Felipe Magalhães, Antonio J. C. Pimentel, Nuno L. A. Chemale, Farid |
author_sort |
Kumaira, Sissa |
title |
Post‐Jurassic brittle deformation of Lusitanian Basin in the context of W Iberia evolution |
title_short |
Post‐Jurassic brittle deformation of Lusitanian Basin in the context of W Iberia evolution |
title_full |
Post‐Jurassic brittle deformation of Lusitanian Basin in the context of W Iberia evolution |
title_fullStr |
Post‐Jurassic brittle deformation of Lusitanian Basin in the context of W Iberia evolution |
title_full_unstemmed |
Post‐Jurassic brittle deformation of Lusitanian Basin in the context of W Iberia evolution |
title_sort |
post‐jurassic brittle deformation of lusitanian basin in the context of w iberia evolution |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/bre.12794 https://onlinelibrary.wiley.com/doi/pdf/10.1111/bre.12794 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Basin Research volume 35, issue 6, page 2165-2192 ISSN 0950-091X 1365-2117 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/bre.12794 |
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Basin Research |
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35 |
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6 |
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2165 |
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2192 |
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1800757594489356288 |