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The alluvial to palustrine-lacustrine Miocene sequence from the Faido-Samiano section (Miranda – Treviño basin, W Pyrenees)

2019; Issue: 66 Linguagem: Espanhol

2173-6545

Zuriñe Larena, Juan Ignacio Baceta, Xabier Murelaga,

Archaeological and Geological Studies

espanolEste trabajo expone los resultados del estudio de la sucesion continental del Mioceno inferior-medio? aflorante en la seccion de Faido-Samiano, en el flanco sureste de la cuenca piggy-back de Miranda-Trevino. El analisis de facies ha conducido a la interpretacion de un sistema sedimentario integrado por ambientes de abanico aluvial, palustre y lacustre. El levantamiento de la seccion estratigrafica y la cartografia de los diferentes tramos ha permitido reconocer un patron de facies recurrente, que refleja varios ciclos de expansion progresiva y retraccion brusca de los humedales palustres-lacustres desarrollados en el centro de la cuenca. La escala y la asimetria de estos ciclos estratigraficos se ha relacionado con pulsos tectonicos de alta frecuencia afectando a los margenes activos de la cuenca. EnglishThis work presents the results from the study of the lower to middle? Miocene continental succession exposed in the Faido-Samiano section, on the south-east flank of the Miranda – Trevino piggy-back basin. Facies analysis allowed accurate interpretation of the constituent deposits and the corresponding depositional settings they characterize, from alluvial to varied palustrine-lacustrine sub-environments. Logging and mapping across an area of about 15 km2 revealed a distinct recurrent stratigraphic arrangement that reflects successive cycles of progressive expansion and abrupt subsequent retraction of the km-wide palustrine-lacustrine wetlands developed on the basin depocentre. The scale and distinct asymmetry of the successive stratigraphic cycles point to an origin likely related to high-frequency pulsating tectonic activity affecting the rising basin margins.