Main features of the basic rock bodies of the Archidona Region derived from geophysical data (External Zones, Betic Cordillera)

The basic igneous rock bodies that crop out in the Archidona region are composed of ophites. Their small size, however, does not justify the total field aeromagnetic anomaly observed, which reaches up to +70 nT. New magnetic, P-wave seismic tomography and gravity data allow the characterization of t...

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Published inComptes rendus de l'Académie des sciences. Série II. Fascicule a, Sciences de la terre et des planètes Vol. 330; no. 10; pp. 667 - 674
Main Authors Bohoyo, Fernando, Galindo-Zaldívar, Jesús, Serrano, Inmaculada
Format Journal Article
LanguageEnglish
Published Paris Elsevier B.V 30.05.2000
Elsevier
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Summary:The basic igneous rock bodies that crop out in the Archidona region are composed of ophites. Their small size, however, does not justify the total field aeromagnetic anomaly observed, which reaches up to +70 nT. New magnetic, P-wave seismic tomography and gravity data allow the characterization of the geometry of the basic rock bodies located in the middle and upper crust. The most important one is a kilometric body between at least 5 and 18 km in depth, probably at the basement of the External Zones and possibly belonging to the Iberian Massif. Dans la région d’Archidona, située dans les zones externes des cordillères Bétiques, existent de petits affleurements de roches ignées basiques (ophites). Elles ne justifient pas l’anomalie aéromagnétique de champ total observée, qui atteint +70 nT. De nouvelles données magnétiques, de tomographie sismique d’ondes P et gravimétriques permettent de distinguer des corps de roches basiques placés au milieu et dans la partie supérieure de la croûte. Parmi eux, on peut remarquer un corps d’extension kilométrique, placé à des profondeurs comprises au moins entre 5 et 18 km, qui pourrait être attribué au Massif ibérique.
ISSN:1251-8050
DOI:10.1016/S1251-8050(00)00194-4