Significado de las deformaciones internas en las peridotitas de Sierra Alpujata (Málaga)
DOI:
https://doi.org/10.3989/egeol.85415-6717Keywords:
Ronda peridotites, plastic deformation, porphyroclastic peridotite, mylonitic peridotite, paleorift, zone of ductile shear.Abstract
The Ronda peridotites rest at the base of the Los Reales nappe (Alpujarride Complex, Betic Chain). Two successive plastic deformations are imprinted in the Sierra Alpujata peridotites. The first one is a high temperature (> 1000º C) -low stress (0.3-0.5 Kb) deformation as show by coarse-grained porphyroclastic lherzolites. This deformation can take place by mantle flow in a spreading zone related to continental rifting. The second deformation. at low temperature (~8000º C) and high stress (1-2 Kb), erase the last one at the edge rones of the peridotite sheet, giving the mylonitisation of peridotites and the development of dynamothermal aureoles in the wall rocks, This deformation is due to the thrusting of a mantle slab over the continental crust.
The kinematic analysis of the high and low-temperature ultrabasic tectonites provides, in the present position of the Betic Chain a N 70º E direction for the paleorift. The peridotite thrusting is practically realized in the same direction, from the WSW to the ENE.
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Published
1985-12-30
How to Cite
Tubía, J. M. (1985). Significado de las deformaciones internas en las peridotitas de Sierra Alpujata (Málaga). Estudios Geológicos, 41(5-6), 369–380. https://doi.org/10.3989/egeol.85415-6717
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