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Título

Deep Seated Density Anomalies Across the Iberia¿Africa Plate Boundary and Its Topographic Response

AutorJimenez-Munt, Ivone CSIC ORCID ; Torné, Montserrat CSIC ORCID ; Fernández Ortiga, Manel CSIC ORCID ; Vergés, Jaume CSIC ORCID ; Kumar, Ajay CSIC ORCID ; Carballo, Alberto CSIC; García-Castellanos, Daniel CSIC ORCID
Palabras claveLithosphere structure
upper mantle thermophysical properties
Gibraltar Arc‐Atlas
geophysical‐petrological model
sublithospheric thermo‐compositional anomaly
Iberia‐Africa plate boundary
Gibraltar
the Betics and Rif tectonic domain
Fecha de publicación2019
EditorAmerican Geophysical Union
CitaciónJournal of Geophysical Research B: Solid Earth 124: 13310- 13332 (2019)
ResumenThe modes in which the lithosphere deforms during continental collision and the mechanisms involved are not well understood. While continental subduction and mantle delamination are often invoked in tectonophysical studies, these processes are difficult to be confirmed in more complex tectonic regions such as the Gibraltar Arc. We study the present¿day density and compositional structure of the lithosphere along a transect running from South Iberia to North Africa crossing the western Gibraltar Arc. This region is located in the westernmost continental segment of the African¿Eurasian plates, characterized by a diffuse transpressive plate boundary. An integrated and self¿consistent geophysical¿petrological methodology is used to model the lithosphere structure variations and the thermophysical properties of the upper mantle. The crustal structure is mainly constrained by seismic experiments and geological data, whereas the composition of the lithospheric mantle is constrained by xenolith data. The results show large lateral variations in the topography of the lithosphere¿asthenosphere boundary. We distinguish different chemical lithospheric mantle domains that reproduce the main trends of the geophysical observables and the modeled P and S wave seismic velocities. A sublithospheric body colder than the surrounding mantle is needed beneath the Betics¿Rif to adjust the measured potential fields. We link this body to the Iberian slab localized just to the east of the profile and having some effect on the geoid and Bouguer anomalies. Local isostasy allows explaining most of the topography, but an elastic thickness higher than 10 km is needed to explain local misfits between the Atlas and the Rif Mountains.
Versión del editorhttp://dx.doi.org/10.1029/2019JB018445
URIhttp://hdl.handle.net/10261/203365
DOI10.1029/2019JB018445
Identificadoresdoi: 10.1029/2019JB018445
issn: 2169-9356
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