Arquitectura secuencial en cuencas lacustres someras (Miocenode la Cuenca del Duero)analogías y diferencias con los principios de la estratigrafía secuencial

Résumé

Sequence stratigraphy principles are compared to similar geometrical architectures in lacustrine sediments of Miocene age in the Duero Basin (NW Spain). The studied sequence shows anerosive base with multiple scours, a lower reach that shows an aggradational pattern, first deepening and later and mostly shallowing upward, followed by an upper reach composed by prograding clinoforms deeper than the immediately underlying deposits. The upper boundary of the sequence is another erosive surface with multiple scours. This sequence can be compared toa type 2 sequence of Van Wagoner et al. (1988). Despite the similarities concerning geometrie sand their evolution, there are some differences about water depth evolution and thus about facies evolution that show reverse relations in the sequence stratigraphy model and our lacustrine case.Similarities are due to common evolution of base level in both cases. Differences arise from the different amount of influence of sedimentation and subsidence in marine and lacustrine systems.