Resumen de Tectosedimentary phases along the Leitza Fault and their relation to Cretaceous Iberia/Europe plate boundary evolution
Eneko Iriarte Avilés, Joaquín García Mondéjar
- español
El estudio tectosedimentario de los materiales cretácicos de la Depresión Intermedia (Pirineos Occidentales, Navarra), ha permitido caracterizar ambientes de sedimentación marinos carbonatados y terrígenos de plataforma y cuenca relativa dispuestos transgresivamente sobre el borde S del Macizo Paleozoico de Bortziri-Cinco Villas. La implantación y evolución de los sistemas deposicionales estuvo controlada por la tectónica sinsedimentaria. Se han diferenciado 5 fases tectosedimentarias correspondientes a la formación y evolución de una cuenca de desgarre controlada por la acción de la falla mayor de Leitza desde el Aptiense superior al Coniaciense. Las características tecto-sedimentarias estudiadas indican la presencia de esfuerzos regionales transtensivos sinistros a lo largo del lapso de tiempo estudiado, excepto en la Fase IV en la que se observa una acción transpresiva a lo largo de la falla de Leitza.
- English
The tectosedimentary study of the Central Depression in the Basque-Cantabrian Basin (Western Pyrenees, Spain) has yielded the characterization and evolution of different marine depositional systems during Aptian to Coniacian times. At that time, carbonate platform to siliciclastic basin marine depositional systems were transgressively arranged onlapping the Bortziri-Cinco Villas Paleozoic Massif.
The onset and evolution of sedimentary depositional systems were controlled by strong sinsedimentary tectonic activity. The study of sinsedimentary tectonic structures and its effects in sedimentary systems has permitted the characterization of 5 tectosedimetary phases related to the formation of a fault-bend type strike-slip basin along the Leitza Fault during Late Aptian to Coniacian times. The observed tectosedimentary features indicate a regional sinistral transtensional strain during all the tectosedimentary phases, except for the Phase IV when transpressional features are recognized, and permit to relate them to sinistral strike-slip movements along the Leitza Fault.
