SEÑALES GEOQUÍMICAS EN PINGÜINOS DEL PALEÓGENO DE ISLA MARAMBIO (SEYMOUR ISLAND), PENÍNSULA ANTÁRTICA
DOI:
https://doi.org/10.5710/PEAPA.14.11.2022.443Palabras clave:
Sphenisciformes, Análisis ICP-MS, Fosil diagénesis, Tafonomía, Mar de Weddell, AntártidaResumen
Los elementos traza, y particularmente los Elementos de las Tierras Raras (REE por sus siglas en inglés), son ampliamente utilizados como indicadores para la reconstrucción de condiciones paleoambientales y tafonómicas. Rastreamos estos elementos en huesos fósiles de pingüinos recolectados a lo largo de la secuencia del Paleógeno expuestos en la Isla Marambio (=Seymour Island) para testearlos como indicadores de los cambios tectónicos a los que estuvo expuesta la región. Los resultados indicaron las concentraciones de REE en el interior de las trece muestras de tejido óseo analizado. La anomalía de europio negativa en las muestras de nivel Bartoniano y Priaboniano refleja eventos regionales. Esta señal coincide en el tiempo con la apertura del Pasaje de Drake, y con los cambios tectónicos que ocurrieron entre finales del Eoceno y principios del Oligoceno, entre el margen occidental de las costas de América del Sur y la Península Antártica.
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