Cortejos sedimentarios en una rampa carbonatada dominada por tormentas (Kimmeridgiense, Cuenca Ibérica)

• Autores: Beatriz Bádenas Lago, Marcos Aurell Cardona
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 1, 2, 2000 (Ejemplar dedicado a: V Congreso Geológico de España (Alicante, 10-14 julio 2000)), págs. 147-150
• Idioma: español
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• Resumen

  • Facies analysis of the Kimmeridgian-lower Tithonian in the outcrops of Ricla-Valm adrid and Sierra de Albarracin (Iberian basin, northeast Spain) allows to examine the processes that controlled the geometry and facies distribution in the systems tracts o f two depositional sequences in a storm dominated carbonate ramp. The Sequence 1 is form ed by TST and HST (and FRST in Sierra de Albarracin). The Sequence 2 is formed by TST, FIST and FRST. The created accomodation was due to the combination o f two third-order regional sea-level cycles and the local subsidence. Lower subsidence rates explain the presence of FRST in Sequence I in Sierra de Albarracin and the overall reduced thickness of Sequence 2. Carbonate production was larger in the shallow ramp domains (coral reefs and oolitic shoals in Sequence I, reefs in Sequence 2) than in deeper domains (micritic facies), where there is no indication of significant pelagic or benthic production.The off-shore resedim entation of the carbonate produced in the shallow areas due to density currents induced by storms, allowed to compesate the diferent carbonate production rate with depth, playing also an important role in the thickness of the systems tracts and in the maintenance of ramp profit.