Arquitectura secuencial en cuencas lacustres someras (Miocenoudde la Cuenca del Duero). Analogías y diferencias con losudprincipios de la estratigrafía secuencial

摘要

Sequence stratigraphy principles are compared to similar geometrica architectures in lacustrineudsediments of Miocene age in the Duero Basin (NW Spain). The studied sequence shows anuderosive base wirh multiple scours, a lower reach that shows an aggradational pattern, firstuddeepening and later and mostly shallowing upward, foffowed by an upper reach composed byudprograding c1inoforms deeper than the immediately underlying deposits. The upper boundary ofudlhe sequence is another erosive surface with multiple scours. This sequence can be compared touda type 2 sequence al Van Wagoner et al. (1988). Despite the similarities concerning geometriesudand their evolution, there are some differences about water depth evolution and thus about faciesudevolution thaat show reverse relations in the sequence stratigraphy model and our lacustrine case.udSimilarities are due lO common evolulion of base level in both cases. Differences arise from theuddifferent amount of influence of sedimentation and subsidence in marine and lacustrine systems.