Four decades of geophysical research on Iberia and adjacent margins

Díaz, Jordi; Torné, Montserrat; Vergés, Jaume; Jiménez‐Munt, Ivone; Martı́, Joan; Carbonell, Ramón; Schimmel, Martín; Geyer, Adelina; Ruiz, Mario; García‐Castellanos, Daniel; Álvarez-Marrón, Joaquina; Brown, Dennis; Villaseñor, Antonio; Ayala, C.; Palomeras, Imma; Fernández, Manel; Muset, Josep Gallart

doi:10.1016/j.earscirev.2021.103841

Cited by 15 publications

(12 citation statements)

References 300 publications

(427 reference statements)

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“…Two vertical cross‐sections (B‐B’ and D‐D’) in Figure 8 represent the vertical cross view of the Alboran slab system along different directions, showing the high‐velocity region in the mantle associated with the so‐called Alboran slab, the most prominent anomaly imaged by P wave tomography studies, whose geodynamical origin is still an open question (e.g., Diaz et al., 2021). The V sv distribution along the east‐west oriented D‐D’ section (Figure 8) facilitates the identification of the top of this slab, which is connected with the zone with thickened crust beneath the strait of Gibraltar.…”

Section: Discussionmentioning

confidence: 99%

“…Among the physical properties that need to be considered, seismic anisotropy plays an important role, as it has been shown that it can have a significant impact both on travel times and waveforms. The objective of this contribution is to complete the anisotropic characterization of the western Mediterranean, an area with a complex tectonic evolution still not fully understood (e.g., Diaz et al., 2021), by presenting a new 3‐D radially anisotropic model of the crust and uppermost mantle.…”

Section: Introductionmentioning

confidence: 99%

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A High‐Resolution Shear Velocity Model of the Crust and Uppermost Mantle Beneath Westernmost Mediterranean Including Radial Anisotropy

Feng,

Diaz

2023

JGR Solid Earth

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Using seismic data from 1,186 stations deployed across the westernmost Mediterranean, we construct a high‐resolution 3‐D radially anisotropic model from a joint inversion of receiver functions and Rayleigh and Love wave dispersions. The Rayleigh and Love data are extracted from both ambient noise interferograms and earthquake waveforms, and a new three‐station ambient noise interferometry method is used to further improve the data coverage. The obtained crustal thickness map reproduces independently the Moho depth maps compiled from previous data, showing crustal roots beneath the Pyrenean‐Cantabrian range and the Gibraltar Arc and thicker crust beneath the Variscan Iberian Massif than in the area affected by Alpine orogenesis. The Vsv crustal model outlines the Iberian Massif as a high shear wave velocity block and shows extremely low velocities in the Gulf of Cadiz and Gibraltar Arc. At mantle levels, a sharp boundary between the Aquitanean Basin and the Massif Central is imaged, with low Vsv beneath the Massif Central probably reflecting a remaining signature of the magma. To the south of Iberia, the geometry of the Alboran slab is captured by the model, while beneath the Atlas Mountains, widespread low Vsv and positive radial anisotropy is observed, favoring the edge‐driven convection model explaining the lithospheric thinning. The most relevant contribution of this work is mapping, for the first time at this scale, the radial anisotropy anomalies at crustal level, with higher values observed in the Alpine Iberia, dominated by present‐day extensional tectonics.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A High‐Resolution Shear Velocity Model of the Crust and Uppermost Mantle Beneath Westernmost Mediterranean Including Radial Anisotropy

Feng,

Diaz

2023

JGR Solid Earth

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“…Given the tectonic complexity of the Iberian Peninsula, affected by the Variscan (Paleozoic) and Alpine (Cenozoic) orogenies, this microcontinent has been the target of geophysical analyses since the 1970s (Díaz et al., 2021). However, most deep seismic lines, which allow to constrain the crustal structure in detail, were planned, to the N and S, to determine the structure of the Cantabrian‐Pyrenean and Betic orogens, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…(2002) proposed that the SPCS was related to large‐scale lithospheric folds producing large high‐angle thrusts. However, global studies of the Iberian lithosphere do not support this hypothesis (Díaz et al., 2021). De Vicente et al.…”

Section: Introductionmentioning

confidence: 99%

Variscan Inheritance Induces Alpine Upper Crustal Delamination in East Spanish‐Portuguese Central System

et al. 2022

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The Spanish‐Portuguese Central System (SPCS) is an Alpine Mountain range with crystalline basement characterized by a two‐layer rheological structure. This structure formed after primary (protolith) and secondary (tectonometamorphic) processes during the extensional collapse of the Variscan Orogen. The SPCS structure is usually controlled by foreland‐directed thrusts and strike‐slip faults. However, the eastern SPCS is dominated by NW‐directed, imbricate backthrusts and lacks the main thrust directed to the foreland basin located southeast of the mountain range (Madrid Cenozoic Basin). The SPCS exhibits a crustal root (>40 km depth) supporting SE‐directed crustal‐scale thrusting. Alpine backthrusts sole into an SE‐dipping décollement within the Variscan basement. Variscan extension‐related structures parallel the SE‐dipping geometry of Alpine backthrusts, so they provided favorably oriented rheological weaknesses to accommodate Alpine shortening. Backthrusts geometry, their hanging wall position within the fault that raised the SPCS and gravity modeling support an Alpine crustal delamination process. Tectonic wedging and delamination of the more competent basement occurred in the footwall of Variscan extensional faults (Daurius domain), which enforced the shearing off of a rheologically weaker upper layer of the crust, located in the hanging wall of the Variscan extensional faults (Arriaca domain) by inverting Variscan extensional faults. This led to NW‐directed incipient continental subduction of the weaker crust. Intraplate subduction and crustal delamination can be independent from lithosphere‐scale inheritance and be conditioned by structural inheritance in the overlying crust. Alpine shortening for the Cretaceous cover is around 17.7 km (10.5% shortening), and 11 km (7%) for the upper‐lower crust limit.

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“…Subduction processes have had a major impact on the geodynamic evolution of the western Mediterranean and the Gibraltar Arc in particular (Rosenbaum et al, 2002;Spakman and Wortel, 2004;Carminati et al, 2012;Chertova et al, 2014a,b;van Hinsbergen et al, 2014;Diaz et al, 2021;Schliffke et al, 2021). The Gibraltar Arc system comprises the Betic Chains in southern Spain and the Rif Mountains in northern Morocco and surrounds the Alboran Sea.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of physical processes involved in the recycling of the lithosphere

Jódar¹

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I would like to express my gratitude to my two supervisors of this master's thesis, Flor de Lis Mancilla and Ana Negredo, for their countless advice and suggestions and for all their help and support. Additionally, to the Andalusian Institute of Geophysics (IAG) and all its team members for giving me the opportunity to develop this work in a very supportive and comfortable environment.Finally, I thank the Computational Infrastructure for Geodynamics (geodynamics.org) which is funded by the National Science Foundation under award EAR-0949446 and EAR-1550901 for supporting the development of ASPECT.

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Four decades of geophysical research on Iberia and adjacent margins

Cited by 15 publications

References 300 publications

A High‐Resolution Shear Velocity Model of the Crust and Uppermost Mantle Beneath Westernmost Mediterranean Including Radial Anisotropy

A High‐Resolution Shear Velocity Model of the Crust and Uppermost Mantle Beneath Westernmost Mediterranean Including Radial Anisotropy

Variscan Inheritance Induces Alpine Upper Crustal Delamination in East Spanish‐Portuguese Central System

Numerical modelling of physical processes involved in the recycling of the lithosphere

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