Ritmicidad de alta frecuencia en una plataforma mixta de alta energía tipo rampa (Tortoniense Superior, Cuenca de Guadix, Cordillera Bética).
- Autores: Fernando García-García, Jesús Miguel Soria Mingorance, Juan Fernández Martínez, César Viseras Alarcón
- Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 9, 2006 (Ejemplar dedicado a: VI Congreso del Grupo Español del Terciario), págs. 91-94
- Idioma: inglés
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Resumen
During the Late Tortonian the stacking of 29 rhythms (10 to 25 m thick each) constituted a succession of the high-energy mixed platform deposits (about 500 m thick) attached to the southwestern margin of the Guadix Basin, one of the Neogene-Quaternary basins of the Betic Cordillera. The ramp platform sequences consist of two lithofacies intervals: burrowed silty marl and cross-stratified calcarenites and calcidurites. The high frequency cyclicity in the succsession is linked to changes reflecting the sum of the climatic variations and tectonic subsidence. It is suggested two climatically-controlled models which could leave its signature on two different scales in the platform deposits:( 1) Glacio-eustatic sea levels changess and (2) Short period catastrophic events that cause instantaneous increase in carrying capacitiy of the rivers, erosion of coastal deposits and storm-dominated deposition on pelagic environments. Each rhythm must have been deposited in a very short time period controlled by fifth-or sixth-order cycles on the basis of the biostratigraphy of the succession.
