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Title: Local formation of varved sediments in a karstic collapse depression of Lake Banyoles (NE Spain)
Author: Morellón, Mario
Anselmetti, Flavio S.
Valero Garcés, Blas Lorenzo
Barreiro-Lostres, Fernando
Ariztegui, Daniel
Giralt Romeu, Santiago
Sáez, Alberto
Mata, M. Pilar
Keywords: Banyoles (Catalunya)
Sediments (Geologia)
Banyoles (Catalonia)
Sediments (Geology)
Issue Date: 1-Feb-2015
Publisher: Sociedad Geológica de España
Abstract: Banyoles is the largest and deepest lake of karstic-tectonic origin in the Iberian Peninsula. The lake comprises several circular sub-basins characterized by different oxygenation conditions at their hypolimnions.The multiproxy analysis of a > 5 m long sediment core combined with high resolution seismic stratigraphy (3.5 kHz pinger and multi-frequency Chirp surveys), allow a precise reconstruction of the evolution of a karstic depression (named B3) until present times.Local meromictic conditions in this sub-basin have been conducive to deposition and preservation of ca. 85 cm of varved sediments since the late 19th century. The onset of these conditions is likely related to lake waters eutrophication caused by increasing farming activities in the watershed. Increasing clastic input and organic productivity during the second half of the 20th century have also been recorded within the laminated sediments, revealing an intensification of human impact and warmer water temperatures
Note: Reproducció del document publicat a:
It is part of: Geogaceta, 2015, vol. 57, p. 119-122
ISSN: 0213-683X
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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