The movement across the Nevado-Filabride shear zones and the convergence of Europe and Africa (Betic orogen)

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  • 420 SELECTED ABSTRACTS

    The movement across the Nevado-Filabride shear zones and the convergence of Europe and Africa (Betic orogen)

    V. Garcia-Duefias a, F. Gonzalez Lodeiro a, A. Jabaloy a, J.M. Martinez Martinez a

    and M. Orozco b

    a Departamento de Geodimimica, Instituro Andah de Geologia Mediterrbnea, C.S.I. C., Universidad de Granada, Granada, Spain Departamento de Geologia, Vniversidad de Sevilla, Sevilla, Spain

    (Received November 27, 1989)

    Abstract

    The Nevado-Filabride Complex and the

    overlying Alpujarride and Malaguide Complexes

    are the three Alpine terrains which essentially

    make up the Alboran crustal domain. It is gener-

    ally accepted that during the Early Miocene this

    domain occupied a relatively more easterly posi-

    tion with respect to Africa and Iberia. The three

    complexes formed a nappe-pile (several tens of km

    thick) which has since thinned.

    The higher Nevado-Filabride nappes at least

    have undergone high to-medium P/T ratio meta- morphism, and several ductile shear zones of vary-

    ing thicknesses have been identified in the com-

    plex. The stretching lineation ranges between

    N50 and 120E.

    The Calar-Alto nappe, the most significant

    element of the Nevado-Filabride Complex, moved

    across a syn- to post-metamorphic shear zone,

    (about 0.5 km thick), resulting in amphibolite

    facies overlapping greenschist facies. High-pres-

    sure mineral relicts exist in the hanging wall,

    whereas they have not been seen in the footwall.

    This nappe and the other N-F units initially

    formed part of a thinned continental crust,

    bounded by transform faults, and would have

    represented the southernmost extreme of the

    Ligurian Tethys. The emplacement of the N-F

    nappes across approximately E-W trajectories is

    consistent with the collision subsequent to the

    subduction of the Ligurian oceanic crust.

    Elsevier Science Publishers B.V.

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