Palaeomagnetic dating and determination of tectonic tilting: a study of Mesozoic-Cenozoic igneous rocks in central west Portugal.

PEREIRA, J.L.; RAPALINI, AUGUSTO E.; TARLING, D. H.; FONSWCA, J.

Palaeomagnetism and Tectonics of the Mediterranean Region (A.Morris y D.H. Tarling, Eds.), Geological Society Special Publication N°105

The Geological Society

Lugar: Bath; Año: 1996; p. 111 - 118

Samples of igneous rocks (36 sites, 218 samples) associated with two main phases of the evolution of the Lusitanian Basin can be dated magnetically to latest Jurassic-early Cretaceous or late Cretaceous-Eocene. Directions of remanence in rocks belonging to the older phase require a 35° rotation to become consistent with directions from stable Europe, while those of younger age do not require such rotation. On a finer scale, the remanent directions can be used to ascertain the probable tectonic tilt at different times of the igneous activity and hence provide intermediate evidence on the tectonic evolution of this area, including rotations of individual tectonic blocks about both vertical and horizontal axes.