Datos paleoambientales de depósitos fluviales asociados a antiguas presas de pesca en el río Miño, NW Iberia
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Los sedimentos fluviales pueden proporcionar registros ambientales del Cuaternario. En algunos casos, los depósitos fluviales pueden ser causados por procesos antropogénicos que provocan cambios en el régimen hídrico de algunos tramos de los ríos. Este es el caso de los actuales embalses. Algunos estudios han mostrado que en el pasado existieron algunas presas o sistemas de represas parciales, desde hace al menos algunos miles de años. Esas presas se utilizaban con fines pesqueros y se denominan fishingweirs o en Galicia pesqueiras. En un trabajo reciente se ha estudiado un depósito fluvial causado por un sistema de embalses en un río del noroeste de la Península Ibérica (rio Miño, Pontevedra). Utilizando luminiscencia estimulada ópticamente (OSL) se pudo datar la edad de deposición de estos sedimentos, obteniéndose un registro fluvial de 1300 años de antigüedad. Las tasas de sedimentación del registro no coincidían con las fluctuaciones climáticas conocidas en la zona. En este trabajo se identifican las fases de sedimentación de ese registro y se estudia el contenido detrítico y la materia orgánica para evaluar los posibles cambios que se hayan producido en las condiciones ambientales y fluviales de ese tramo del río durante el período de deposición del registro, que va de 814±134 a 1837±11 d.C.
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