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.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 1985 Consejo Superior de Investigaciones Científicas (CSIC)
This work is licensed under a Creative Commons Attribution 4.0 International License.
© CSIC. Manuscripts published in both the print and online versions of this journal are the property of the Consejo Superior de Investigaciones Científicas, and quoting this source is a requirement for any partial or full reproduction.
All contents of this electronic edition, except where otherwise noted, are distributed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. You may read the basic information and the legal text of the licence. The indication of the CC BY 4.0 licence must be expressly stated in this way when necessary.
Self-archiving in repositories, personal webpages or similar, of any version other than the final version of the work produced by the publisher, is not allowed.
