Preservation of the Iberian Tethys paleomargin beneath the eastern Betic mountain range
Metadatos
Afficher la notice complèteAuteur
Morales 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 MiguelEditorial
Elsevier
Materia
Tethys paleomargin South Iberian peninsula Eastern Betic Cordillera Crustal structure P-wave Receiver Functions
Date
2022-02-05Referencia bibliográfica
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]
Patrocinador
Geophysical 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 AndaluciaRésumé
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.