Articles | Volume 12, issue 7
Research article
06 Jul 2021
Research article |  | 06 Jul 2021

Evolution of the Iberian Massif as deduced from its crustal thickness and geometry of a mid-crustal (Conrad) discontinuity

Puy Ayarza, José Ramón Martínez Catalán, Ana Martínez García, Juan Alcalde, Juvenal Andrés, José Fernando Simancas, Immaculada Palomeras, David Martí, Irene DeFelipe, Chris Juhlin, and Ramón Carbonell

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Cited articles

Alcock, J. E., Martínez Catalán, J. R., Arenas, R., and Díez Montes, A.: Use of thermal modeling to assess the tectono-metamorphic history of the Lugo and Sanabria gneiss domes, Northwest Iberia, Bull. Soc. Geol. Fr., 180, 179–197,, 2009. 
Alcock, J. E., Martínez Catalán, J. R., and Arenas, R.: One- and two-dimensional models are equally effective in monitoring the crust's thermal response to advection by large-scale thrusting during orogenesis, Comput. Geosci., 37, 1205–1207,, 2011. 
Alcock, J. E., Martínez Catalán, J. R., Rubio Pascual, F. J., Díez Montes, A., Díez Fernández, R., Gómez Barreiro, J., Arenas, R., Dias da Silva, Í., and González Clavijo, E.: 2-D thermal modeling of HT-LP metamorphism in NW and Central Iberia: Implications for Variscan magmatism, rheology of the lithosphere and orogenic evolution, Tectonophysics, 657, 21–37,, 2015. 
Alonso, J. L.: Sequences of thrusts and displacement transfer in the superposed duplexes of the Esla Nappe Region (cantabrian zone, nw spain), J. Struct. Geol., 9, 969–983,, 1987. 
Alonso, J. L., Marcos, A., and Suárez, A.: Paleogeographic inversion resulting from large out of sequence breaching thrusts: The León Fault (Cantabrian zone, NW Iberia). A new picture of the external Variscan thrust belt in the Ibero-Armorican arc, Geol. Acta, 7, 451–473,, 2009. 
Short summary
Vertical incidence seismic profiling on the Iberian Massif images a mid-crustal-scale discontinuity at the top of the reflective lower crust. This feature shows that upper- and lower-crustal reflections merge into it, suggesting that it has often behaved as a detachment. The orogen-scale extension of this discontinuity, present in Gondwanan and Avalonian affinity terranes into the Iberian Massif, demonstrates its relevance, leading us to interpret it as the Conrad discontinuity.