
handle: 10261/381643
[ES] Se describe la estructura de la zona de cizalla del Cañamares, en el extremo oriental del Sistema Central español. Se trata de una estructura de la fase D3 varisca, situada en la Zona Centro Ibérica. Su disposición general es N-S a N160ºE y vertical. El desplazamiento acomodado por la zona de cizalla en la horizontal es lateral derecho. La orientación de la foliación S3 y de los ejes de la crenulación (L3) asociados al cizallamiento ha permitido aplicar un modelo analítico cinemático de transpresión. El resultado es que dicha zona habría actuado como una estructura transpresiva monoclínica ( = 0º) o ligeramente triclínica ( = 10º), con extrusión en la vertical, y valores de vorticidad en el campo del predominio del cizallamiento simple (Wk > 0.81). Esta cinemática predice satisfactoriamente la reorientación fábricas anteriores cerca de la zona de cizalla (e.g., lineación L2). La dirección de convergencia entre los bloques separados por la zona de cizalla sería N-S a NNW-SSE, lo que debe ser interpretado en el complejo marco de la evolución tectónica del orógeno varisco durante la etapa de formación de oroclinales.
[EN] A structural description of the Cañamares shear zone, at the eastern end of the Spanish Central System, is made here. It is a structure from the Variscan D3 phase, located in the Central Iberian Zone. Its general attitude is N-S to N160ºE and vertical. The horizontal displacement accommodated by the shear zone in the is right lateral. The orientation of the S3 foliation and the crenulation lineation (L3) associated with the shear zone has allowed the application of a kinematic analytical model of transpression. The shear zone would have acted as a monoclinic ( = 0º) or slightly triclinic ( = 10º) transpressive structure, with vertical extrusion, and vorticity values in the field of the predominance of simple shearing (Wk > 0.81). This kinematics predicts the reorientation of previous fabrics near the shear zone, such as the L2 lineation. The direction of convergence between the blocks separated by the shear zone would be N-S to NNW-SSE, which must be interpreted in the complex framework of the tectonic evolution of the Iberian Variscan belt during the formation of the oroclines.
Agradecimientos a los proyectos PID2021-126347NB-I00, PID2020-112489GB-C21 y PID2020-112489GB-C22 financiados por MCIN/AEI/ 10.13039/501100011033.
Presentado en el XI Congreso Geológico Español (Ávila, 2024).
Peer reviewed
Orógeno Varisco, Zona Centro Ibérica, Pliegues erguidos, Central Iberian Zone, Shear zone, Variscan Orogen, Zona de cizalla, Spanish Central System, Upright folds, Sistema Central español
Orógeno Varisco, Zona Centro Ibérica, Pliegues erguidos, Central Iberian Zone, Shear zone, Variscan Orogen, Zona de cizalla, Spanish Central System, Upright folds, Sistema Central español
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