Lyell Collection
Geological Society, London, Special Publications
Lyell Centre  |   Lyell Collection  |   Subscriptions   |   Geological Society  |   Email alerts  |   Online bookshop  |   Help

Keywords:
Author:
Advanced search>>
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Request Permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Pereira, J. L.
Right arrow Articles by Fonseca, J.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Geological Society, London, Special Publications; 1996; v. 105; p. 111-117;
DOI: 10.1144/GSL.SP.1996.105.01.10
© 1996 Geological Society of London

Western Mediterranean

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

J. L. Pereira1,2, A. Rapalini1,3, D. H. Tarling1 & J. Fonseca4

1 Department of Geological Sciences, University of Plymouth, Plymouth PL4 8AA, UK
2 School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK
3 Departamento de Ciencias Geologicas, Faculdad de Cencos Exactas y Naturales (UBA), Pabellon 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina
4 Departamento de Fisica, Instituto Superior Ticnico, 1096 Lisboa, Portugal

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.