Articles | Volume 12, issue 7
Solid Earth, 12, 1515–1547, 2021
https://doi.org/10.5194/se-12-1515-2021

Special issue: The Iberian Massif in the frame of the European Variscan...

Solid Earth, 12, 1515–1547, 2021
https://doi.org/10.5194/se-12-1515-2021

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 et al.

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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, https://doi.org/10.2113/gssgfbull.180.3.179, 2009. 
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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, https://doi.org/10.1344/105.000001449, 2009. 
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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.