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Geological Society, London, Special Publications; 1996; v. 105; p. 33-41;
DOI: 10.1144/GSL.SP.1996.105.01.03
© 1996 Geological Society of London

Western Mediterranean

The Neogene remagnetization in the western Betics: a brief comment on the reliability of palaeomagnetic directions

J. J. Villalaín1, M. L. Osete1, R. Vegas2, V. García-Dueñas3 & F. Heller4

1 Departamento de Física de la Tierra, Astronomía y Astrofísica I, Universidad Complutense, Madrid 28040, Spain
2 Departamento de Geodinámica, Universidad Complutense, Madrid 28040, Spain
3 Departamento de Geodinámica, Instituto Andaluz de Geología Mediterránea, CSIC and Universidad de Granada, 18071 Granada, Spain
4 Institut für Geophysik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland

Recent palaeomagnetic investigations in the western Subbetics have shown the existence of a widespread pervasive magnetic overprint of Neogene age in Upper Jurassic rocks. This remagnetization is coeval with the folding deformation in the area. We describe three examples in which the fold test result indicates that the remagnetization is pre-folding, post-folding and synfolding. An evaluation of the consequences of an incorrect interpretation of the remagnetization is presented. Heterogeneous rotational patterns can be explained as a consequence of incorrect evaluation of the timing between folding and overprint acquisition.