Publication: Caracterización estratigráfica y sedimentológica del Viseense Superior de Sierra Boyera (Área del Guadiato, SO de España)
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2000
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Sociedad Geológica de España
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Abstract
En este trabajo se presentan los resultados obtenidos a partir de la investigación realizada en la sucesión estratigráfica del Viseense superior que aflora en el área de Sierra Boyera, al sureste de Peñarroya-Pueblonuevo (Córdoba). Se ha cartografiado el área; se han estudiado y muestreado numerosos afloramiento~ y se ha levantado una sección estratigráfica en la zona en donde el afloramiento de calizas es más continuo (sección de Sierra Boyera). Con ello se ha llevado a cabo la caracterización del ambiente sedimentario en que se depositaron los materiales carboníferos, las variaciones existentes dentro de éste, así como la datación precisa de dichos materiales. En Sierra
Boyera, el ambiente deposicional correspondería al de una plataforma dominada por las tormentas (en la zona interna), con desarrollo de montículos microbianos en condiciones submareales (en la zona externa). Al noroeste, adyacentes a Sierra Boyera pero sin continuidad estratigráfica con ésta,
afloran potentes masas de brechas calcáreas que corresponderían a depósitos de tipo debris flow (afloramientos de Antolín 1,3 Y 4). Las asociaciones de foraminíferos presentes, aunque pobres, han permitido datar los materiales como Viseense superior y se ha podido precisar que el desarrollo de los montículos microbianos tuvo lugar durante la cronozona 15 de foraminíferos (parte media del Viseense superior)
The results obtained during the geological study of Sierra Boyera, southeast of PeñarroyaPueblonuevo, Córdoba Province, are shown in this paper. The area has been mapped and many outcrops have been studied and sampled. A stratigraphic section has been described in the area where calcareous outcrops are more continuous. The Carboniferous deposits of Sierra Boyera were formed in an inner, storm-dominated marine platform, and in a deeper outer platform where microbial mounds developed. Thick mas ses of calcareous breccias interpreted as debris flow deposits crop out north-westwards from the Sierra Boyera Section, but no stratigraphical continuity between both areas is observed. The foraminiferal'assemblages in these deposits are poor, but enough for dating the rocks. The age of the sediments embraces most of the late Viséan, but the microbial limes tones of Sierra Boyéra were mostly developed during the foraminiferal chronozone 15 (middle part of the late Viséan)
The results obtained during the geological study of Sierra Boyera, southeast of PeñarroyaPueblonuevo, Córdoba Province, are shown in this paper. The area has been mapped and many outcrops have been studied and sampled. A stratigraphic section has been described in the area where calcareous outcrops are more continuous. The Carboniferous deposits of Sierra Boyera were formed in an inner, storm-dominated marine platform, and in a deeper outer platform where microbial mounds developed. Thick mas ses of calcareous breccias interpreted as debris flow deposits crop out north-westwards from the Sierra Boyera Section, but no stratigraphical continuity between both areas is observed. The foraminiferal'assemblages in these deposits are poor, but enough for dating the rocks. The age of the sediments embraces most of the late Viséan, but the microbial limes tones of Sierra Boyéra were mostly developed during the foraminiferal chronozone 15 (middle part of the late Viséan)