El Mioceno inferior de Chirivel (Almería): bioestratigrafía, cronoestratigrafía y significado tectosedimentario de las formaciones de Ciudad Granada y Fuente-Espejos

• J.M. González Donoso ^[1] ; D. Linares ^[1] ; E. Molina ^[2] ; F. Serrano ^[1]
  1. [1] Universidad de Málaga

     Universidad de Málaga

     Málaga, España

     
  2. [2] Universidad de Zaragoza

     Universidad de Zaragoza

     Zaragoza, España

     
• Localización: Revista de la Sociedad Geológica de España, ISSN 0214-2708, Vol. 1, Nº. 1-2, 1988, págs. 53-71
• Idioma: español
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• Resumen
  • español

    Se establecen las edades de las formaciones de Ciudad Granada y Fuente-Espejos, que afloran en las proximidades de Chirivel (Almería), a partir de los foraminíferos planctónicos contenidos en sus materiales. La Formación de Ciudad Granada se atribuye al Aquitaniense «inferior» y «medio», sin desechar categóricamente que su base pertenezca al Oligoceno «superior». La Formación de Fuente-Espejos se data como Burdigaliense «inferior» y base del «superior». Se discute, asimismo, el significado tectosedimentario de estas formaciones en el contexto de la evolución de la cordillera.

  • English

    In this paper, we present the results of our work on outcrops of Miocene located between the External and the Internal Zones of the Betic Cordillera, in the Barranco Blanco section, near Chirivel (Almería).

    Two formations (Ciudad Granada and Fuente-Espejos) are recognized. The latter has previously been defined as two independent formations. The ages of the two formations studied are established by means of their content of planktonic foraminifera. The Ciudad Granada Formation contains Globigerinoides primordius Blow y Banner near its base, but not Globigerinoides trilobus (Reuss) at higher levels; because of this, it is referred to the «lower» and «middle» Aquitanian, without categorically excluding that its base could belong to the «upper» Oligocene. The Fuente-Espejos Formation contains Globigerinoides altiaperturus Bolli referred from its lowest levels; in its upper levels, the L.A.D. of Catapsydrax dissimilis (Cushman and Bermúdez) is located. Therefore we assign it to the «lower» Burdigalian and the base of the «upper» Burdigalian.

    We also discuss the tectosedimentary significance of these formations in the context of the evolution of the Cordillera. The Ciudad Granada Formation could have been deposited before the final formation of the nappe structures of the Internal Zones or, at least, before the erosion of the Malaguide, once the nappes had been formed. The Fuente-Espejos Formation is clearly posterior to the nappe-tectonics in the Internal Zones and contemporaneous with the movement of the Internal and External Zones towards each other.

    We conclude that two tectogenetic events could be specially important: the first took place during the uppermost Aquitanian and the second developed during the «lower» Burdigalian and perhaps extended into the «upper» Burdigalian.