Cambios laterales de facies en ciclos perimareales carbonatados de alta frecuencia (Sinemuriense, Cordillera Ibérica)

Abstract

The sedimentary record of the high-frequency Sinemurian cycles originated in the shallow carbonate platform of the northern Iberian basin (NE Spain) show marked differences depending on the environment in which they developed. Vertical facies distribution in shallowing upward cycles with intertidal laminated caps has a great lateral homogeneity (more than 12 km across) with no significant variation. However, the cycles dominated by grainy facies, mostly formed in the open marine wave-agitated areas, show rapid lateral facies changes and irregular record of discontinuity surfaces. In this case, the number and distribution of the cycles defined in a single log cannot be representative of the entire platform area. Accordingly, the definition of cycles originated in these high-energy open platform areas should be based in the analysis of laterally continuous outcrops