T13B-3001
Geophysical and petrological characterization of the lithospheric mantle in Iberia, Western Mediterranean and North Africa

Monday, 14 December 2015
Poster Hall (Moscone South)
Montserrat Torne1, Manuel Fernandez1, Alberto Carballo1, Ivone Jiménez-Munt1, Jaume Verges2, Antonio Villasenor1,2, Daniel Garcia-Castellanos3 and Jordi Diaz Cusi4, (1)Spanish National Research Council, Institute of Earth Sciences Jaume Almera, Barcelona, Spain, (2)Institute of Earth Sciences Jaume Almera, Barcelona, Spain, (3)Instituto de Ciencias de la Tierra Jaume Almera, Barcelona, Spain, (4)ICTJA-CSIC, Barcelona, Spain
Abstract:
We present a geophysical and petrological study that aims to define the lithosphere structure and the variations of the chemical composition of the lithospheric mantle along three geo-transects crossing Iberia, the westernmost Mediterranean and North Africa. The modeling is based on an integrated geophysical-petrological methodology that combines elevation, gravity, geoid, surface heat flow, seismic and geochemical data. Unlike previous models, where the density of the lithospheric mantle is only temperature-dependent, the applied methodology allows inferring seismic velocities and density in the mantle down to 400 km depth from its chemical composition through self-consistent thermodynamic calculations. The first geo-transect with a length of 1100 km runs from the NE-Iberian Peninsula to the Tell–Atlas Mountains in Algeria. The second profile crosses the entire Iberian Peninsula, from the Northern Iberian Margin to the Alboran Basin. The third runs from the Iberian Massif to the Sahara Platform crossing the Betic-Rif orogenic system through the Gibraltar Strait and the Atlas Mountains. Results are compared to available tomography models and Pn-velocity data. The obtained lithospheric structure shows large lateral variations in crustal and lithospheric mantle thicknesses and mantle chemical composition. Measured low Pn velocities in the Western Mediterranean basin can be explained either by serpentinization and/or seismic anisotropy and only partly by transient thermal effects. In the Bay of Biscay low Pn velocities are explained only by serpentinization. The negative sub-lithospheric velocity anomalies imaged by tomography models below the Iberian plate and the Atlas Mountains are interpreted in terms of high-temperature/low-density regions being responsible for the high mean topography.