Vicente, Gerardo de and González Nistal, S. and Muñoz Martín, Alfonso and Vegas, Ramón and Olaiz Campos, Antonio José and Fernández Lozano, Javier and Vicente, Raquel de (2007) El cabalgamiento cenozoico de Boinás (Cordillera Cantábrica, España). Geogaceta, 42 . pp. 7-10. ISSN 0213-683X
Official URL: http://www.geogaceta.com
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.
|Uncontrolled Keywords:||Thrust, Cenozoic, Cantabrian Mountains, Alpine stress|
|Subjects:||Sciences > Geology > Geodynamics|
|Deposited On:||18 Jan 2010 10:48|
|Last Modified:||16 Oct 2012 12:55|
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