Low-angle detachment faults vs. transcurrent structures in the Betic Internal Zone: the case of the Mecina fault and the system of faults south of the Sierra Nevada
DOI:
https://doi.org/10.3989/egeol.45393.1099Keywords:
Betic Internal Zone, Extension, Tectonic detachments, Tectonic laminationsAbstract
The Mecina fault, located to the SW of the Sierra Nevada, affects the contact between the Nevado-Filábride and Alpujárride complexes. Later, its characteristics were extended to this entire contact, then defined as the detachment of Mecina, which has been interpreted as separating two tectonic levels: the upper one, the Alpujárride, widely fractured, and the lower one, the Nevado-Filábride, free of these deformations. But the features initially attributed to this fault need to be integrated with those of the dextral E-W faults band of the Alpujarran corridor. In this band, all the rocks, including those from the Nevado-Filábride, are clearly affected. In addition, to the W of the Sierra Nevada other deformations due to the enormous uplift there happened also affect the Nevado-Filábride complex. The tectonic laminations existing in this latter complex can be attributed above all to the effect of the faults band and the cited uplift. The prolongation of the proposed Mecina detachment under the Granada basin, as the main detachment level, is not supported by the evidence, nor is its continuation under the Betic External Zone.
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