Constraints on the frontal crustal structure of a continental collision from an integrated geophysical research: The central-western Betic Cordillera (SW Spain)
Por:
Ruiz-Constn A., Pedrera A., Galindo-Zaldívar J., Pous J., Arzate J., Roldan-Garcia, FJ, Marin-Lechado C., Anahnah F.
Publicada:
21 ago 2012
Resumen:
Melange rocks outcrop widely in the central and western frontal sectors of the Betic Cordillera, as in many other collisional orogens where they form part of the accretionary wedges. Extrusion of Triassic plastic clays and evaporites was favored by the progressive accretion of the Betic External Zones, mixing rocks of different provenance and forming a synorogenic frontal melange unit. MT data coupled with gravity data are a valid combined methodology to characterize the geometry of these melange units, since the characterization of plastic rocks geometry is usually uncertain using seismic techniques. The results correlate well with known geological features (sedimentary basins, calcareous ranges, evaporitic rocks) and reveal the deep geometry. A resistive body, slightly dipping toward the SE, points to the continuity of the Iberian Massif below the Guadalquivir basin (2 degrees) and the External Zones (6-8 degrees). To the south, gravity models show the Iberian continental crust subdu
Filiaciones:
UNAM, Ctr Geociencias, Queretaro 76220, Mexico
Géosciences Montpellier, Université Montpellier 2, CNRS, Place E. Bataillon, FR-34095 Montpellier, France
Instituto Geológico y Minero de España, Ríos Rosas 23, ES-28003 Madrid, Spain
Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, ES-18071 Granada, Spain
Departamento de Geodinámica, Universidad de Granada, Campus Fuentenueva S/n, ES-18071 Granada, Spain
Departament de Geodinàmica i Geofísica, Universitat de Barcelona, ES-08028 Barcelona, Spain
|