Publication: Revisión de la Formación Calizas de Aras de Alpuente
en la Cordillera Ibérica suroccidental
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Publication Date
1994
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Abstract
El estudio estratigráfico detallado de la Fm. Calizas de Aras de Alpuente (Vilas et al, 1982) ha permitido realizar una revisión de la Formación y de los Miembros que la constituyen desde un punto de vista puramente litoestratigráfico, y además, llevar a cabo un análisis secuencial, estableciendo correlaciones muy precisas entre los distintos afloramientos. El reconocimiento de la existencia de tres Secuencias Deposicionales, constituidas por once parasecuencias, permite precisar los límites inferior y superior de la unidad en su región tipo. El inferior es una importante discontinuidad estratigráfica, correlacionable con el límite de un ciclo global de tercer orden. Por el contrario, el límite superior se caracteriza exclusivamente por el cambio litológico de caliza a dolomía, el cual es fuertemente diacrónico. Se propone la validez del Mb. Margas de Losilla y se define el Mb. Calizas de Losa del Obispo, para la parte superior de la Fm. situada por encima de la Capa de Margas de Chera.
A detailed stratigraphic study of the Aras de Alpuente Formation (Vilas eta!, 1982) allows both a revision of the unit from a purely Lithostratigraphical point of view and the realization of a sequential analisys, based in an accurate correlation between different outcrops. Three depositional sequences and eleven parasequences have been identified; based on them the lower and upper boundaries in the type area are more precisely defined. The lower boundary is an important discontinuity which is coincident with a 3rd order cycle boundary; on the other hand, the upper boundary is characterized by the lithologieal change from limestones to dolostones, which is strongly diacrhonous. It is proposed the regional validity of the Losilla Member and it is also detined the Losa del Obispo Member for the upper portion of Ihe Formation located aboyetlie Chera Bed.
A detailed stratigraphic study of the Aras de Alpuente Formation (Vilas eta!, 1982) allows both a revision of the unit from a purely Lithostratigraphical point of view and the realization of a sequential analisys, based in an accurate correlation between different outcrops. Three depositional sequences and eleven parasequences have been identified; based on them the lower and upper boundaries in the type area are more precisely defined. The lower boundary is an important discontinuity which is coincident with a 3rd order cycle boundary; on the other hand, the upper boundary is characterized by the lithologieal change from limestones to dolostones, which is strongly diacrhonous. It is proposed the regional validity of the Losilla Member and it is also detined the Losa del Obispo Member for the upper portion of Ihe Formation located aboyetlie Chera Bed.