
handle: 10261/206131
The lithological sequence of the Nevado-Filábride Complex (Betic Cordillera, S Spain) in the sierras Nevada and Filabres can be divided into four formations. From bottom to top the first corresponds to dark schists and quartzites of about 3600 m thick. Above lie the quartzites of Benitagla and then the Tahal light schists, and at the top lies the schists and marbles Fm. The thickness of the upper formations is on the order of 2000 m. The passage between the formations is stratigraphic and transitional. The metamorphism is inverted, being of higher grade to the top. This feature led to the proposal of superposition of tectonic units, with a higher grade of metamorphism in the upper ones, but the tectonic contacts between these units, according to our data, simply do not exist. The deposit of the lower formation had a syntectonic-compressional character while the other ones formed in extensional and post-tectonic environment in relation to the Variscan orogeny. New faults then formed permitted the extrusion of igneous rocks, including some ultrabasic ones, which according to our scheme were extruded together with basic rocks, not linked to an oceanic crust.
[ES] e dividirse en cuatro formaciones. De abajo arriba la primera corresponde a esquistos oscuros y cuarcitas, con un espesor de unos 3600 m. Encima están las cuarcitas de Benitagla y los esquistos claros de Tahal, y a techo se sitúa una formación de esquistos y mármoles. El espesor de las formaciones superiores es del orden de 2000 m. El paso entre formaciones en general es de carácter estratigráfico y transicional. El grado metamórfico está invertido de muro a techo. Este rasgo indujo a la propuesta de superposición de unidades tectónicas, con mayor grado metamórfico en las superiores, pero los contactos tectónicos entre estas posibles unidades, en nuestra opinión, no existen. El depósito de la formación inferior tuvo un carácter sintectónico-compresional mientras que las otras se formaron en régimen en extensión, ya post-tectónico, en relación a la Orogenia Varisca. Nuevas fallas formadas entonces permitieron la extrusión de rocas ígneas, incluyendo algunas ultrabásicas, que en nuestra opinión fueron extruidas junto con rocas básicas, no ligadas a una corteza oceánica.
EI/FEDER CGL2016-80687-R) of DGICYT, and the research group RMN-370 of the Junta de Andalucía. We thank the professors M. Martín-Martín (Alicante), A. Folguera (Buenos Aires) and B. Bádenas (editor) whose corrections and suggestions have clearly improved this article.
Lithological formations., Betic Cordillera, Nevado-Filábride Complex
Lithological formations., Betic Cordillera, Nevado-Filábride Complex
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