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El cabalgamiento cenozoico de Boinás (Cordillera Cantábrica, España)



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Vicente Muñoz, Gerardo de y González Nistal, S. y Muñoz Martín, Alfonso y Vegas, Ramón y Olaiz Campos, Antonio José y Fernández Lozano, Javier y Vicente, Raquel de (2007) El cabalgamiento cenozoico de Boinás (Cordillera Cantábrica, España). Geogaceta, 42 . pp. 7-10. ISSN 0213-683X

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The opencast gold mine of Boinás, has allowed to outcrops the contact between the variscan basement
and the Cenozoic sediments. It is observable that the contact is a post - Lower Oligocene thrust, with a
N40ºE trend. From a macrostructural point of view, Boinás thrust spreads along more than 10 km with a
constant orientation, a vertical gap that reaches 400 m, and a NW vergence. Northwestwards another
Alpine thrust develops (Tineo, A l o n s o y Pulgar , 2004) with a parallel orientation an opposite vergence.
Between both thrusts a tectonic pop-down appears (Narcea Pop-down). The dynamic analysis shows that
this structure was activated by a paleostress tensor with an horizontal s1 trending N139ºE, with a stress regime close to uniaxial compression (R=0.06). This stress allows the geometrical interchanges between s2 and s3. The outcrop also allows to observe a secondary population of normal faults, that fits to an extensional stress tensor (R=0.01) with s3 trending N146ºE, that is coaxial with the main compressive stress tensor. We interpret both fault populations as generated by the tectonic thrust emplacement.

Tipo de documento:Artículo
Palabras clave:Thrust, Cenozoic, Cantabrian Mountains, Alpine stress
Materias:Ciencias > Geología > Geodinámica
Código ID:9837
Depositado:18 Ene 2010 09:48
Última Modificación:22 Abr 2015 08:09

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