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handle: 10261/264078
[ES] Presentamos una nueva clasificación de dominios geológicos en el límite de placas África-Eurasia al suroeste de Iberia, junto con una reconstrucción geodinámica regional que abarca desde la extensión Mesozoica hasta la convergencia actual (Martínez-Loriente et al., 2014). Los resultados se basan en modelos de velocidad sísmica y densidad a lo largo de dos transectos regionales de gran ángulo, combinados con información previa disponible. La integración de toda la información nos permite definir 3 dominios oceánicos al suroeste de Iberia: (1) el dominio SAP, compuesto por corteza oceánica generada durante las primeras etapas de la extensión oceánica del NE Atlántico central (Martínez-Loriente et al., 2014); (2) el dominio GC, compuesto por corteza oceánica generada en el sistema extensivo Alpino-Tetis entre Iberia y África, que fue contemporáneo con la formación del dominio SAP y finalizó con la ruptura continental del Atlántico Norte (Jurásico tardío); y (3) el dominio del GB, compuesto principalmente de rocas exhumadas del manto con algo de magmatismo sincrónico, formado durante las primeras etapas de la apertura del Atlántico Norte. Los modelos sugieren que los dominios SAP y GC están separados por la falla en dirección Lineament South, mientras que los dominios de GC y GB parecen estar limitados por una falla inversa profunda ubicada en el centro de la llanura abisal de Horseshoe (Martínez-Loriente et al., 2014)
[EN] We present a new classification of geological domains at the Africa-Eurasia plate boundary off SW Iberia, together with a regional geodynamic reconstruction spanning from the Mesozoic extension to the Neogene-to-present-day convergence (Martínez-Loriente et al., 2014). It is based on seismic velocity and density models along two regional wide-angle seismic transects, combined with previously available information. The integration of all this information allows defining the presence of 3 oceanic domains off SW-Iberia: (1) the SAP domain, made of oceanic crust generated during the first stages of slow seafloor spreading in the NE Central Atlantic (Early Jurassic) (Martínez-Loriente et al., 2014); (2) the GC domain, made of oceanic crust generated in the Alpine-Tethys spreading system between Iberia and Africa, which was coeval with the formation of the SAP domain and lasted up to the North Atlantic continental break-up (Late Jurassic); and (3) the Gorringe Bank (GB) domain, mainly made of rocks exhumed from the mantle with little synchronous magmatism, which formed during the first stages of North Atlantic opening. Our models suggest that the SAP and GC domains are separated by the Lineament South strike-slip fault, whereas the GC and GB domains appear to be limited by a deep thrust fault located at the center of the Horseshoe Abyssal Plain (Martínez-Loriente et al., 2014)
X Congreso Geológico de España, 5-7 de julio 2021, Vitoria-Gasteiz.-- 1 page
Peer reviewed
Sísmica de gran ángulo, Suroeste de Iberia, Límite de Placas África-Eurasia, Naturaleza del basamento, Tomografía sísmica
Sísmica de gran ángulo, Suroeste de Iberia, Límite de Placas África-Eurasia, Naturaleza del basamento, Tomografía sísmica
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