| Título: | El cabalgamiento cenozoico de Boinás (CordilleraCantábrica, España) |
| Autores: | Vicente Muñoz, Gerardo de ; González Nistal, S. ; Muñoz Martín, Alfonso ; Vegas, Ramón ; Olaiz Campos, Antonio José ; Fernández Lozano, Javier ; Vicente, Raquel de |
| Tipo de documento: | texto impreso |
| Editorial: | Sociedad Geológica de España, 2007 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Geodinámica , Tipo = Artículo |
| Resumen: |
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. |
| En línea: | https://eprints.ucm.es/id/eprint/9837/1/Boinas2007.pdf |
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