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)
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.