Placa iberica
La placa iberica èra una pichona placa tectonica, dicha tanben microplaca, ara soudada dempuèi la fin de l'Oligocèn a la placa eurasiatica que ne fa partida, sus que se pausava la peninsula Iberica[1] mas tanben las Balearas, Corsega, Sardenha e benlèu lo Briançonés[2].
Història
La placa iberica vendriá de la placa nordamericana que se seriá trencada a la fin del Cretacèu[3]. Es a l'origina de l'obertura del golf de Gasconha per un pivotament d'esperela dins lo sens cotrari del relòtge[3]. Aquela rotacion s'acompanha a l'èst per une subduccion jos la placa eurasiatica puèi una tust de lors massas continentalas respectivas[3]. Aquela subduccion puèi tust ont participèron a la formacion dels Pirenèus[3],[1] entre autre pendent lo Mesozoïc[4]. Pendent aquela èra geologica se realizèron dos episòdis de rift sus sa bordura septentrionala, caracterizats per la formacion d'importants bacins de sedimentacion ligats a de subsidéncias successivas[4].
Sus la bordura meridionala d'aquela anciana placa, lo desplaçament de la placa africana cap al nòrd provòca de tensions tectonicas complèxas[3] a l'origina de la formacion de las sèrras beticas.
A partir de la fin de l'Oligocèn, la placa iberica acaba d'èsser una placa tectonica d'esperela se soudant a la placa eurasiatica e adoptant son comportament[3].
Notas e referéncias
- ↑ 1,0 et 1,1 (fr)Formation des Pyrénées Raymond Mirouse; ed:Geolval
- ↑ (en)Deformation history of a subducted continental crust (Gran Paradiso, Western Alps): continuing crustal shortening during exhumation; doi=10.1016/j.jsg.2006.02.009; vol:28; ed:5 p:793–815 Benjamin Le Bayon e Michel Ballèvre; 2006 in Journal of Structural Geology
- ↑ 3,0 3,1 3,2 3,3 3,4 et 3,5 (en)Iberian plate kinematics: a jumping plate boundary between Eurasia and Africa S. P. Srivastava, H.Schouten, W. R. Roest, K. D. Flitgord, L. C. Kovacs, J. Verhoef e R. Macnab in Nature n°344 p:756-759, 19 d'abril de 1990 |doi=10.1038/344756a0 en linha
- ↑ 4,0 et 4,1 (en)Characterizing the Mesozoic extension direction in the northern Iberian plate margin by anisotropy of magnetic susceptibility (AMS) Ruth Soto, Antonio M. Casas-Sainz, Juan J. Villalain, Guillermo Fernandez-Gonzalez, Pedro Del Rio, Manuel Calvo e Tania Mochales; 2008; in Journal of the Geological Society; issn=0016-7649; vol:165 p:1007-1018 en linha
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