Abstract
Lake La Parra (39º 50’, 1º 52’, 1014 m) is a small (1 ha), relatively deep (Zmax = 17.5 m), freshwater (TDS = 356 mg/L) monomictic lake with a circular morphology (116 m diameter), developed in a doline that intercepted the local Jurassic-Cretaceous aquifer. It is part of a karstic lake complex of seven lakes located in the Iberian Range (Cuenca, East of Spain). Sediment cores obtained in the central part of the lake were analysed using sedimentological, microscopic, geochemical and physical techniques. The ca. 7 m long sequence is mainly composed by clastic carbonated sediments, characterized by a high variability of sedimentary facies, indicative of large fluctuations in the sediment delivery to the lake. Chronology is based on 7 AMS radiocarbon dates. The depositional evolution of La Parra sequence reflects a high hydrological variability during the last 1600 years. Prior to the Roman Epoch, La Parra doline was dry and only became a lake after 4th century AD. Shallower conditions and higher sediment input occurred during the Medieval Climate Anomaly (MCA) and more humid phases during the Little Ice Age (LIA). The main human impact in the lake and the watershed environment is related to changes in the land uses (transhumance, deforestation, crops) during the Middle Ages (500-1400 DC) and during 18th- mid 20th centuries.
Highlights
Palabras clave: Holoceno tardío, facies sedimentarias, geoquímica, lago kárstico, ambientes de sedimentación lacustre, paleohidrología, Península Ibérica
En este trabajo se ha llevado a cabo un estudio sedimentológico y geoquímico de alta resolución en sondeos obtenidos en la laguna kárstica de La Parra, situada en la Cordillera Ibérica (NE de España, provincia de Cuenca)
Flood response to rainfall variability during the last 2000 years inferred from the Taravilla Lake record (Central Iberian Range, Spain)
Summary
Recientemente se han llevado a cabo numerosas reconstrucciones climáticas en el área mediterránea basadas en estudios multidisciplinares (isótopos, polen, geoquímica, sedimentología) de sistemas lacustres, que han demostrado ser archivos excepcionales de la evolución ambiental y climática a escala regional (ver referencias en Valero-Garcés y Moreno, 2011; Moreno et al, 2012; Roberts et al, 2012). Evolución sedimentaria del lago kárstico de La Parra lacustres se han descrito cambios climáticos significativos en el Holoceno tardío, particularmente durante el Periodo Húmedo Ibero-Romano, la Anomalía Climática Medieval y la Pequeña Edad de Hielo (Valero-Garcés y Moreno, 2011; Moreno et al, 2012). El robusto modelo cronológico proporcionado por técnicas de datación de radiocarbono AMS, ha permitido describir los cambios en las condiciones del lago, su cuenca de recepción e investigar la compleja interrelación entre el clima y las actividades humanas desde el final del Periodo Romano
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