%0 Journal Article
%A Vicente Muñoz, Gerardo de
%A González Nistal, S.
%A Muñoz Martín, Alfonso
%A Vegas, Ramón
%A Olaiz Campos, Antonio José
%A Fernández Lozano, Javier
%A Vicente, Raquel de
%T El cabalgamiento cenozoico de Boinás (CordilleraCantábrica, España)
%D 2007
%@ 0213-683X
%U https://hdl.handle.net/20.500.14352/50429
%X The opencast gold mine of Boinás, has allowed to outcrops the contact between the variscan basementand the Cenozoic sediments. It is observable that the contact is a post - Lower Oligocene thrust, with aN40ºE trend. From a macrostructural point of view, Boinás thrust spreads along more than 10 km with aconstant orientation, a vertical gap that reaches 400 m, and a NW vergence. Northwestwards anotherAlpine 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 thatthis 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.
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