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| Titel |
A lithospheric cross-section across the NE Iberian Peninsula and the western Mediterranean Basin |
| VerfasserIn |
Alberto Carballo, Manuel Fernandez, Ivone Jiménez-Munt, Montserrat Torne |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250076457
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| Zusammenfassung |
| Abstract
Results from the TRANSMED-II geotransect and all available geophysical and geological data have been
implemented in a 1000 km 2-D lithospheric profile that runs from the Aquitanian basin to the Tell mountains,
crossing the Pyrenees, the Ebro basin (NE of the Iberian Peninsula), and the Valencia Trough and Algerian
basins (western Mediterranean). The modeling approach integrates elevation, gravity, geoid, surface heat flow,
and seismic and petrological data. Unlike previous models proposed for the region where the density of the
lithospheric mantle was considered to be only temperature-dependent, the applied methodology allows inferring
seismic velocities and density from its mineralogical composition through self-consistent thermodynamic
calculations. To fit the geophysical observables and the geological setting in each region, we have considered two
different lithospheric mantle compositions corresponding to Phanerozoic or Tecton in the collision/subduction
zones (Pyrenees and the Kabyles-Tell area) and a more fertile mantle in the neogene back-arc extended basins
of the W Mediterranean (Valencia and Algerian basins). Particular attention has been taken underneath the W
Mediterranean part of the profile where variable low Pn velocities are recorded at the uppermost lithospheric
mantle, which could be attributed either to anisotropy, transient thermal effects, the presence of a serpentinized
mantle or the combination of all those effects. The obtained lithospheric thickness shows noticeable differences
with previous studies. Maximum depths of the lithosphere–asthenosphere boundary (LAB) are found beneath the
Pyrenees (with values exceeding 150 km). The lithosphere is thinned in the W Mediterranean region, especially
in the Algerian basin and the Valencia basin (∼60 km), showing a slight thickening (∼75 km) below the Balearic
promontory. |
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