Sedimentary evidences of historical seawater temperature and sea level changes in the Cadiz Bay (SW Spain). Relation with regional high-energy oceanic events
DOI:
https://doi.org/10.32685/0120-1425/bol.geol.51.1.2024.718Palabras clave:
cambios climáticos recientes, movimientos eustáticos, isótopos de oxígeno, Glycymeris nummaria, Golfo de Cádiz, España
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Derechos de autor 2024 Servicio Geológico Colombiano
Esta obra está bajo una licencia internacional Creative Commons Atribución 4.0.
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El estudio trata de establecer la historia deposicional de sedimentos bioclásticos recientes en la Bahía de Cádiz (SO de España). Estos depósitos contienen acumulaciones conchíferas interestratificadas en la arena costera localizadas a diferentes alturas sobre el nivel del mar actual. Sus edades 14C cubren un intervalo de tiempo entre 200 años aC y 850 años dC que incluye el periodo Cálido Romano y el inicio del Periodo Cálido Medieval. Se realizaron análisis sedimentológicos, mineralógicos, químicos e isotópicos (δ18O) para determinar la naturaleza de los depósitos y la respuesta deposicional de los medios costeros a los cambios medio ambientales y a la acción de eventos oceánicos de alta energía. El análisis sedimentológico indica que las acumulaciones conchíferas estudiadas muestran rasgos deposicionales similares a los causados por flujos direccionales de alta energía, generados por grandes olas de temporales o tsunamis, lo que explicaría también el origen de los depósitos y la posición topográfica en la que se encuentran. Los valores de δ18O obtenidos sugieren que, en esta región del Atlántico Norte, las fluctuaciones de temperatura del agua del mar fueron relativamente pequeñas para el intervalo de tiempo estudiado, siendo su rango de amplitud similar al de los cambios de temperatura estacionales actuales en el mar Mediterráneo. Este hecho puede ser atribuible tanto a la latitud media-baja de la zona de estudio como a la mezcla de masas de agua de las corrientes atlántica y mediterránea, que pudo moderar el efecto de los cambios climáticos observables en áreas atlánticas de mayor latitud.
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