Aplicación del estudio de reimanaciones a la datación de las brechas de la base del Jurásico en la Cordillera Ibérica
- Juan José Villalaín Santamaría 1
- Antonio María Casas Sáinz 2
- Marcos Aurell Cardona 2
- Alicia Palencia Ortas 3
- 1 Universidad de Burgos, Dep. de Física - E.Politécnica Superior,
- 2 Univ. Zaragoza, Dep. Ciencias de la Tierra
- 3 Univ. Comp. de Madrid, Facultad de C. Físicas. Dep. de Física de la Tierra.
ISSN: 1576-5172
Argitalpen urtea: 2008
Zenbakien izenburua: VII Congreso Geológico de España
Zenbakia: 10
Orrialdeak: 1215-1218
Mota: Artikulua
Beste argitalpen batzuk: Geotemas (Madrid)
Laburpena
From the study of remagnetization of Cretaceous age in an outcrop of the widespread breccia unit of the Lower Jurassic sequence (Cortes de Tajuña Fm.) in the northern Iberian Range, the age of formation of this unit can be inferred. Rock magnetism experiments and NRM analyses indicate that breccia clasts are remagnetized and show paleomagnetic vectors with random orientation, what demonstrates that breccia formation post-dates the Early Cretaceous remagnetization stage. The breccia matrix records a reverse paleomagnetic vector thus confirming that brecciation must post-date the Cretaceous Normal Superchron (i.e. they must be post-Santonian in age).