Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...78..343t&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 78, Issue 3-4, p. 343-354.
Physics
7
Scientific paper
The Málaga region in southern Spain represents a cross-section through the continental crust and subcontinental mantle of the westernmost portion of the Internal Zone of the Betic Cordillera. Recent petrological and structural studies carried out in this region show a link between the Maláguide Complex and the underlying Los Reales Nappe, where the Ronda peridotites were incorporated as allochthonous slabs. The Ronda peridotites are covered by the metamorphic sequence of the Los Reales Nappe, which consists of acidic granulites, migmatites and schists. The tectonometamorphic evolution of these granulite facies rocks involves a first high-temperature (800°C)-high-pressure (10 kbar) metamorphism replaced by high-temperature (750°C)-low-pressure (3.5 kbar) conditions. This strong thermal event, which is also recognized in biotite-bearing schists of the Los Reales Nappe and even in the overlying Maláguide Complex, developed during an extensional deformation related to the diapiric stage of the Ronda peridotite emplacement. Stretching lineations from the mylonites related to this extensional event are N 110°E in orientation and kinematic criteria show that low-grade metamorphic rocks (Maláguide Complex) move down on to higher grade ones (Los Reales Nappe) from west to east. Consequently, we interpret that the Maláguide Complex and Los Reales Nappe form a single domain of continental crust which was thinned during the emplacement of the Ronda peridotites. Stretching lineations are subparallel to the trend of the Betic Cordillera and can be integrated in a model of lithospheric transcurrent thinning.
Cuevas Julia
Navarro-Vilá Francisco
Tubía Josém.
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