Estudio paleomagnético del dique de Messejana-Plasencia
- A. Palencia 1
- M.L. Osete 1
- M. Maceira 1
- J.J. Villalaín 2
- R. Vegas 3
- 1 Dpto. de Geofísica, Facultad de C. Físicas, Universidad Complutense de Madrid
- 2 Dpto. de Física, Escuela Politécnica Superior, Universidad de Burgos
- 3 Dpto. Geodinámica, Facultad de CC. Geológicas, Universidad Complutense de Madrid
ISSN: 1576-5172
Año de publicación: 2004
Título del ejemplar: VI CONGRESO GEOLÓGICO DE ESPAÑA (Zaragoza, 12-15 julio, 2004)
Número: 6
Páginas: 315-318
Tipo: Artículo
Otras publicaciones en: Geotemas (Madrid)
Resumen
A paleomagnetic investigation of 39 sites (591 samples) across the 530 km ot the Messejana-Plasencia dike has been carried out. Rock magnetic experiments indicate PSD low Ti titanomagnetiteand magnetite as the minerals carrying the NRM. The samples where mostly demagnetised bythermal demagnetisation. Most sites exhibit a characteristic remanent component of normal polarity with the exception of two sites, where samples with reversed polarities have been observed.The paleomagnetic pole derived from the sites is well defined, with values ot Plat=70.5,Plong=238.0, K= 47.8 and ags=3.5. Paleomagnetic data indicates: (i) the dike had a brief emplacement time, (ii) the age of intrusion can be constrained between 180-200 Ma, (Hi) the high grouping of the VGPs directions suggest no important tectonic perturbations of the whole structure ofthe dike since its intrusion to the present.