Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/1264
Título: Response of a multi-domain continental margin to compression: Study from seismic reflection-refraction and numerical modelling in the Tagus Abyssal Plain
Autor: Neves, M. C.
Terrinha, R.
Afilhado, Alexandra
Moulin, M.
Matias, L.
Rosas, F.
Palavras-chave: Tectonic inversion of rifted margin
Deep structure
FEM modelling
West Iberia margin
Crustal stucture
Plate boundary
Flemish cap
Iberian Peninsula
Rifted margins
West Iberia
Data: 1-Abr-2009
Editora: Elsevier Science BV
Citação: Neves M C, Terrinha R, Afilhado A, Moulin M, Matias L, Rosas F. Response of a multi-domain continental margin to compression: Study from seismic reflection-refraction and numerical modelling in the Tagus Abyssal Plain. Tectonophysics. 2009; 468 (1-4): 113-130 Sp. Iss. SI.
Relatório da Série N.º: 1-4
Resumo: The effects of the Miocene through Present compression in the Tagus Abyssal Plain are mapped using the most up to date available to scientific community multi-channel seismic reflection and refraction data. Correlation of the rift basin fault pattern with the deep crustal structure is presented along seismic line IAM-5. Four structural domains were recognized. In the oceanic realm mild deformation concentrates in Domain I adjacent to the Tore-Madeira Rise. Domain 2 is characterized by the absence of shortening structures, except near the ocean-continent transition (OCT), implying that Miocene deformation did not propagate into the Abyssal Plain, In Domain 3 we distinguish three sub-domains: Sub-domain 3A which coincides with the OCT, Sub-domain 3B which is a highly deformed adjacent continental segment, and Sub-domain 3C. The Miocene tectonic inversion is mainly accommodated in Domain 3 by oceanwards directed thrusting at the ocean-continent transition and continentwards on the continental slope. Domain 4 corresponds to the non-rifted continental margin where only minor extensional and shortening deformation structures are observed. Finite element numerical models address the response of the various domains to the Miocene compression, emphasizing the long-wavelength differential vertical movements and the role of possible rheologic contrasts. The concentration of the Miocene deformation in the transitional zone (TC), which is the addition of Sub-domain 3A and part of 3B, is a result of two main factors: (1) focusing of compression in an already stressed region due to plate curvature and sediment loading; and (2) theological weakening. We estimate that the frictional strength in the TC is reduced in 30% relative to the surrounding regions. A model of compressive deformation propagation by means of horizontal impingement of the middle continental crust rift wedge and horizontal shearing on serpentinized mantle in the oceanic realm is presented. This model is consistent with both the geological interpretation of seismic data and the results of numerical modelling.
Peer review: yes
URI: http://hdl.handle.net/10400.21/1264
ISSN: 0040-1951
Aparece nas colecções:ISEL - Eng. Civil - Artigos

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