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Wide-angle seismic and gravity constraints on the basement affinity of the Africa-Eurasia Plate boundary: implications for the geodynamic evolution of the SW Iberian Margin

AutorMartínez-Loriente, S. ; Sallarès, Valentí ; Gràcia, Eulàlia ; Bartolomé, Rafael
Fecha de publicaciónoct-2014
Citación16TH SEISMIX International Symposium on Multi-scale Seismic Imaging of the Earth's crust and Upper Mantle. Abstracts: 126 (2014)
ResumenIn 2008 a Spanish-French team carried out the NEAREST-SEIS refraction and wide-angle reflection seismic (WAS) survey offshore the SW Iberian Margin, onboard the Spanish R/V Hesperides. The main objectives were to provide information on the physical properties of the basement, the deep geometry of the geological structures, and to prove the affinity and boundaries between the different geological domains. During the survey two regional WAS profiles were acquired using an OBS array composed of 17 short period instruments of the Spanish OBS pool and 19 instruments from Ifremer. The seismic source consisted of 2 airgun arrays with a total of 7 Bolt airguns (model 1500LL), adding a total volume capacity of 4520 c.i. A total of 30 OBS were deployed along profile P1, which is 356 km long and extends on the outer part of the Gulf of Cadiz, whereas 15 OBS and 7 landstations were deployed along profile P2, which is 256 km long and extends on the central Gulf of Cadiz. We performed the joint refraction and reflection travel-time inversion of the WAS data following a three-step layer-stripping procedure consisting of adding the data sequentially, starting from the shortest offsets/uppermost levels and finishing with the longest offsets/deepest levels. This strategy allows accounting for sharp velocity contrast across geological interfaces such as the sediment-basement or the crust-mantle boundary. The final velocity models have been complemented with gravity modelling, which was done converting the WAS-derived seismic velocity to density using different empirical velocity-density relationships for each geological layer assuming a given lithological composition. The integration of all this new information allows presenting the first basement-affinity distribution map at the Africa-Eurasia plate boundary off SW Iberia, distinguishing three oceanic domains, together with a regional geodynamic evolution model spanning from the Mesozoic extension to the Neogene-to-present-day convergence
Descripción16TH SEISMIX International Symposium on Multi-scale Seismic Imaging of the Earth's crust and Upper Mantle, 12-17 October 2014, Castelldefels, Barcelona.-- 1 page
Versión del editorhttp://www.iplusdinnova.com/es/conference/16th-seismix-international-symposium
Aparece en las colecciones: (ICM) Comunicaciones congresos
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