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handle: 10261/29364
[EN] The paleogeographical attribution of the tectonics units of Sierra de Almagro and its own structure have been traditionally involved in a notorious controversy. Here was first defined the Almágride Complex and later on the Ballabona-Cucharón Complex, the last attributed to a Subbetic (Betic Externa1 Zone) subducted, metamorphosed and now outcropping in a tectonic window. Nevertheless, in this study, the previously supposed units of Ballabona, Almagro and Cucharón are unified in a single one, the Tres Pacos unit, because they correspond to different parts of a common stratigraphic series. Locally there are detachments between the different formations of the stratigraphic series, the most important one, situated between the phyllites and quartzites of "Ballabona" and the carbonates of "Almagro", dissapear laterally. In the Sierra de Almagro E-W folds exist, facing to the S in its northern part and to the N in its southern part. The existence of the Almagro Complex (and of the Ballabona-Cucharón Complex) is discarted and, hence, none of the units of the Sierra de Almagro can belong to the Subbetic. The Tres Pacos unit forms part of the Alpujarride complex, clearly superposed to the Nevado-Filábride Complex and overlain by the Variegato unit (Alpujarride).
[ES] La diferenciación de unidades de Sierra de Almagro, así como su estructura, han sido objeto de una notable controversia. Se definió allí el complejo Almágride y posteriormente el complejo Ballabona-Cucharón, este último atribuido a un Subbético (Zona Externa Bética) subducido, metamorfizado y ahora aflorante en ventana tectónica. Por el contrario, en este estudio las supuestas unidades de Ballabona, Almagro y Cucharón se unifican en una sola, la de los Tres Pacos, pues corresponden a diferentes partes de una misma serie estratigráfica. Esta unidad, perteneciente al Alpujárride, está claramente sobre el Nevado-Filábride y bajo launidad de Variegato (del Alpujárride). En la Sierra de Almagro existen pliegues este-oeste que vergen al sur en su parte septentrional y al norte en la meridional. Localmente se producen despegues entre los materiales, el más importante de los cuales, el del contacto entre las filitas y cuarcitas de "Ballabona" y los carbonatos de "Almagro", se absorbe lateralmente. Se descarta la existencia del complejo Almágride y por tanto que alguna unidad de Sierra de Almagro perteneciera originalmente a la zona Subbética. Las unidades que fueron atribuidas a ese dominio corresponden a unidades alpujárrides inferiores.
Este artículo ha sido financiado por los proyectos PB97-1267-C03-01y PB97-1201 de la DGICYT y los grupos RNM 0217 y 0163 de la Junta de Andalucía.
11 páginas, 6 figuras.--
Peer reviewed
Betic Cordillera, Cordillera Bética, Betic internal zone, Nevado-Filabride Complex, Malaguide Complex, Alpujarride Complex, Zona interna Bética
Betic Cordillera, Cordillera Bética, Betic internal zone, Nevado-Filabride Complex, Malaguide Complex, Alpujarride Complex, Zona interna Bética
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