Resumen de Secuencias de alto orden en una rampa carbonatada dominada por tormentas (Kimmeridgiense superior, Cordillera Ibérica septentrional)
Beatriz Bádenas Lago, Marcos Aurell Cardona
Facies and strataI analysis of a distal-mid ramp succession (Rida, NE Spain) has allowed the identification of high-order sequencesw hich are included in the TST of a third-order depositional sequence (Late Kimmeridgian). This succession is formed by lime mudstones with storm deposits.
The identified high-order sequences (27 bundles and 6 sets of bundles) are equivalent to those recognized in the contemporaneous outer ramp lime mudstone succession of the Aguilón outcrop, located 40 km offshore (eastwards). Thickness (c.1.5 m), number of lime mudstone beds (1 to 12) and stratal pattern of bundles are similar in both sections. Sets of bundles in Rida have a similar number of bundles (c. 5) to those of Aguilón. The correlation proposed in this work gives support to an allocyclic origin for the high-order sequences. Bundles and sets of bundles have been related to sea-level changes controlled by precession and short eccentricity cycles affecting the carbonate productivity of shallower areas and, consequently-, inducing variations of the amount of carbonate exported into deeper areas. The presence of a similar number of beds in the bundles that have storm deposits (Rida) and the equivalents bundles of Aguilón, indicates the relation between storms flows and the allocyclic process.
