Preservation of the Iberian Tethys paleomargin beneath the eastern Betic mountain range
MetadataShow full item record
AuthorMorales Soto, José; Molina Aguilera, Antonio; Mancilla Pérez, Flor de Lis; Stich, Daniel; Azañón Hernández, José Miguel; Teixidó Ullod, Teresa; López Comino, José Ángel; Posadas, Antonio Miguel
Tethys paleomarginSouth Iberian peninsulaEastern Betic CordilleraCrustal structureP-wave Receiver Functions
José Morales... [et al.]. Preservation of the Iberian Tethys paleomargin beneath the eastern Betic mountain range, Gondwana Research, Volume 106, 2022, Pages 237-246, ISSN 1342-937X, [https://doi.org/10.1016/j.gr.2022.01.015]
SponsorshipGeophysical Instrument Pool at GFZ-Potsdam - Spanish State Research Agency (SRA) PID2019-109608GB I00/SRA/10.13039/501100011033; Spanish Government CGL2015-67130-C2-2-R; FEDER/Junta de Andalucia project A-RNM-421-UGR18 RNM104; Junta de Andalucia
We obtain P-wave receiver functions from teleseismic earthquake recordings at a dense seismic broadband transect, deployed along 170 km across the Betic mountain range in southeastern Spain. Migrated images show the crustal structure of the orogen in detail. In particular, they reveal the situation of the subducted Iberian paleomargin, with full preservation of the proximal domain and the 50 km wide necking domain. Crustal thinning across the necking domain affects mainly the lower continental crust. The Variscan crust of the Tethys margin is bending downward beneath the Betics, reaching 45 km depth, and terminates abruptly at a major slab tear. The distal domain of the paleomargin cannot be reconstructed, but the migrated section suggests that material has been exhumed through the subduction channel and integrated into the Betic orogen. This supports an origin of the HP-LT Nevado-Filabride units from subducted, hyperextended Variscan crust. According to our profile, the present-day eastern Betics appear to have a much more significant contribution from metamorphic Iberian crust than previously thought.