caa a22 4500 477064604 CHVBK 20180405111409.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF02422236 doi (NATIONALLICENCE)springer-10.1007/BF02422236 A 2.5-D interpretation of the Basque country magnetic anomaly (northern Spain): geodynamical implications [Elektronische Daten] [J. Aller, H. Zeyen] The Basque country magnetic anomaly follows a NW-SE trend over the Basque country (northern Spain) with intensities up to 250 nT measured at 3000 m above sea level. The paired negative part of the anomaly is located to the north and presents intensities down to −60 nT. A model of the magnetic properties of the crust in the area, taking into account previous geological and geophysical data, indicates a wedge of material with a magnetic susceptibility of 0.07 SI emplaced along a NE-directed basal thrust. The anomalous wedge is composed of basic and/or ultrabasic Cretaceous intrusives and lower crustal rocks, and reaches a minimum depth which increases towards the northwest from 5-7 to 12 km. According to previous works, geological features of the rocks on top of the anomalous wedge indicate that during the Cretaceous this zone constituted a deep marine environment which underwent important crustal thinning related to rifting. The transition towards the southwest was to a normal continental platform. Alpine deformation gave rise to displacement on a basal thrust, which can be correlated with the lower contact of the magnetic wedge, and emplacement of this wedge towards the northeast. The southeastern termination of the anomaly can be related to the lateral termination of the basic rocks which constitute the anomalous wedge in a transform fault related to the rifting event. Springer-Verlag GmbH & Co KG, 1996 Magnetic anomaly nationallicence Crustal structure nationallicence Basque-Cantabrian basin nationallicence Aller J. Departamento de Geología, University of Oviedo, E-33005, Oviedo, Spain aut Zeyen H. Geophysikalisches Institut, University of Karlsruhe, Hertzstrasse 16, D-76187, Karlsruhe, Germany aut Geologische Rundschau Springer-Verlag 85/2(1996-06-01), 303-309 0016-7835 85:2<303 1996 85 531 https://doi.org/10.1007/BF02422236 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02422236 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aller J. Departamento de Geología, University of Oviedo, E-33005, Oviedo, Spain aut NATIONALLICENCE 700 1- Zeyen H. Geophysikalisches Institut, University of Karlsruhe, Hertzstrasse 16, D-76187, Karlsruhe, Germany aut NATIONALLICENCE 773 0- Geologische Rundschau Springer-Verlag 85/2(1996-06-01), 303-309 0016-7835 85:2<303 1996 85 531 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer