RT Journal Article
T1 El cabalgamiento cenozoico de Boinás (CordilleraCantábrica, España)
A1 Vicente Muñoz, Gerardo de
A1 González Nistal, S.
A1 Muñoz Martín, Alfonso
A1 Vegas, Ramón
A1 Olaiz Campos, Antonio José
A1 Fernández Lozano, Javier
A1 Vicente, Raquel de
AB 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.
PB Sociedad Geológica de España
SN 0213-683X
YR 2007
FD 2007
LK https://hdl.handle.net/20.500.14352/50429
UL https://hdl.handle.net/20.500.14352/50429
LA spa
DS Docta Complutense
RD 6 may 2024