Deep deformation pattern from electrical anisotropy in an arched orogen (Betic Cordillera, western Mediterranean)
Por:
Ruiz-Constán A., Galindo-Zaldivar J., Pedrera A., Arzate J.A., Pous J., Anahnah F., Heise W., Santos, FAM, Marín-Lechado C.
Publicada:
1 ago 2010
Categoría:
Geology
Resumen:
Long-period magnetotelluric data acquired in the Iberian Massif and the Betic Cordillera arched orogen provide the first evidence of electrical anisotropy in the upper mantle of the Mediterranean region. Strike analysis at different periods reveals preferred structure orientation related to olivine elongation in the mantle, and points to a heterogeneous anisotropy pattern. At deep levels (periods >= 10(4) s), all the sites show a common north-south geoelectrical strike (similar to N170 degrees E), which may represent a low-intensity deformation, possibly related to "frozen" prealpine plate tectonics. For periods between 10 and 10(3) s, a north-south constant strike (similar to N180 degrees E) at the Betic Cordillera sites contrasts with the east-west strike (similar to N85 degrees E) in the Iberian Massif. An increase in the magnitude of the induction arrows from the Iberian Massif to the inner part of the Betic Cordillera probably reflects higher deformation toward the axis of the Eur
Filiaciones:
Univ Nacl Autonoma Mexico, Ctr Geosci, Queretaro, Mexico
Departamento de Geodinámica, Universidad de Granada, Granada, Spain
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Granada, Spain
Instituto Geológico y Minero de España, Granada, Spain
Departament de Geodinàmica i Geofísica, Universitat de Barcelona, Barcelona, Spain
Departamento de Física, Centro de Geofísica, Universidade de Lisboa, Lisbon, Portugal
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