Los isótopos de carbono como herramienta de análisis de una secuencia estratigráfica: ejemplos de las calizas margosas del Toarciense Inferior y Medio de Portugal
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https://doi.org/10.21701/bolgeomin.118.1.001Palabras clave:
alternancias de margocalizas, Isótopos del Carbono, Portugal, secuencias estratigráficas, ToarcenseResumen
Las series del Toarciense Inferior y Medio de la Cuenca lusitánica (Portugal) se caracterizan generalmente por la existencia de alternancias de margocalizas hemipelágicas, incluidas en la Formación S. Giao. La sucesión está organizada informalmente en tres secuencias deposicionales de tercer orden (ST1 a ST3), limitadas por discontinuidades regionales. Estas secuencias deposicionales están caracterizadas por cambios verticales y laterales en las lito y biofacies. Utilizando un control bioestratigráfico preciso mediante ammonites, los límites de la secuencia son asignadas a la parte inferior de la zona polymorphum (SBT1), el límite de la zona polymorphum-levisoni (SBT2), y las partes superiores de las zonas levisoni (ST2) y bifrons (ST3). La parte superior de la zona levisoni es una fase de máximo transgresivo de segundo orden. Los datos de los isótopos de Carbono procedentes de muestras de carbonato total de algunas secciones de la Cuenca Lusitánica (Rabaçal, Porto de Mós, Coimbra y Figueira da Foz) revelan que esta técnica analítica es un buen indicador de la evolución de la secuencia de tercer orden. Las excusiones positivas de δ3C corresponden a fases transgresivas (transgressive systems tracts), mientras que las excursiones y tendencias negativas se relacionan con períodos de regresión (lowstand y highstand systems tracts). Además, los eventos globales de δ3C reconocidos en las secciones del Toarciense Inferior de algunas cuencas Norte-Europeas y del Tethys, han sido observados en todas las secciones estudiadas en la Cuenca lusitánica.
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