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Journal of the Geological Society; 2003; v. 160; issue.3; p. 435-445;
DOI: 10.1144/0016-764902-079
© 2003 Geological Society of London

Original Article

Granite laccolith emplacement in the Iberian arc: AMS and gravity study of the La Tojiza pluton (NW Spain)

A. Aranguren1, J. Cuevas1, J.M. TubÍa1, T. RomÁn-Berdiel2, A. Casas-Sainz2 & A. Casas-Ponsati3

1 1Departamento de Geodinámica, Facultad de Ciencias, Universidad del País Vasco, 48080 Bilbao, Spain (e-mail: goparira@lg.ehu.es)
2 2Departamento de Geología, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain
3 3Departamento de Petrología, Geoquímica i Prospecció Geològica, Facultat de Geología, Universitat de Barcelona, 08071 Barcelona, Spain

A laccolithic geometry is inferred from geological and geophysical data for the La Tojiza granitic body emplaced in an extensional regime. Nearly circular in outcrop, this 16 km diameter pluton, one of the so-called ‘post-tectonic granodioritic plutons’ of Galicia, is located in the northern Variscan arc of Iberia, within the Mondoñedo Nappe (Western Asturian–Leonese Zone). From anisotropy of magnetic susceptibility measurements and extensive microstructural data, the magnetic fabric of this pluton has been inferred to correlate with the magmatic fabric. Magnetic foliations strike NE–SW and dip gently SE. Magnetic lineations trend NW–SE and plunge gently SE. Gravity data suggest that the pluton has the shape of a sheet with a maximum preserved thickness of 1 km and a root zone located at its eastern border. This pluton is reinterpreted as late kinematic and emplaced during an extensional tectonic regime related to the ductile Vivero normal fault. It is suggested that the emplacement of most post-tectonic plutons of this part of the Variscan orogenic belt may have been controlled by the late extensional collapse of the Iberian Massif.

Key Words: Iberian arc • plutons • magnetic susceptibility • gravity anomalies • extensional tectonics




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[Abstract] [PDF]