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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

Authors: Sanz de Galdeano, Carlos;

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

Abstract

La falla de Mecina se sitúa al SO de Sierra Nevada y allí afecta al contacto entre los complejos Nevado-Filábride y Alpujárride. Posteriormente su significado se extendió a todo este contacto, definiéndose entonces el detachment de Mecina, un despegue que, según se interpreta, separa ambos complejos, ampliamente fracturado el superior, el Alpujárride, mientras que el inferior, el Nevado-Filábride, queda por debajo, sin sufrir esas deformaciones. Pero los rasgos inicialmente atribuidos a esta falla se deben integrar junto con los de la banda de fallas E-O dextrorsas del corredor de las Alpujarras. En esta banda todos los materiales allí presentes, incluidos los del Nevado-Filábride están netamente afectados. Además, al O de Sierra Nevada hay otras deformaciones debidas al enorme levantamiento allí producido que afectan también al Nevado-Filábride. Las laminaciones que se observan en este último complejo se pueden atribuir sobre todo a ambos rasgos. La prolongación bajo la cuenca de Granada del propuesto detachment de Mecina como el principal nivel de despegue no se observa justificada y, menos aún, su continuación bajo la Zona Externa Bética.

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.

Country
Spain
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Keywords

Extensión, Laminaciones tectónicas, Zona Interna Bética, Tectonic detachments, Extension, Betic Internal Zone, Despegues tectónicos, Tectonic laminations

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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