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Sedimentary evolution of La Parra karstic lake (Cuenca) over the last 1600 years: Paleohydrology, climate, and human impact | Evolución sedimentaria del lago kárstico de La Parra (Cuenca) durante los últimos 1600 años: Paleohidrología, clima e impacto humano

By Fernando Barreiro-Lostres, Ana Moreno Caballud, Santiago Giralt and Blas L. Valero-Garcés

Abstract

Lake La Parra (39° 50', 1° 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. © Universidad de La Rioja.Esta investigación se ha financiado con el proyecto GLOBALKARST (CGL2009-08415), concedido por la Comisión Interministerial de Ciencia y Tecnología (CICYT).Peer Reviewe

Topics: Geochemistry, Iberian Peninsula, Karstic lake, Lacustrine depositional environments, Late Holocene, Palaeohydrology, Sedimentary facies
Publisher: 'Universidad de la Rioja'
Year: 2013
DOI identifier: 10.18172/cig.2005
OAI identifier: oai:digital.csic.es:10261/85600
Provided by: Digital.CSIC
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