Local formation of varved sediments in a karstic collapse depression of Lake Banyoles (NE Spain)

Morellon, M; Anselmetti, Flavio; Valero-Garces, B; Barreiro-Lostres, F; Ariztegui, D; Giralt, S; Saez, A; Pilar Mata, M (2015). Local formation of varved sediments in a karstic collapse depression of Lake Banyoles (NE Spain). Geogaceta, 57, pp. 119-122. Sociedad Geológica de España

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Banyoles is the largest and deepest lake of karstic-tectonic origin in the Iberian Peninsula. The lake comprises several circular sub-basins characteri- zed by different oxygenation conditions at their hypolimnions. The multiproxy analysis of a > 5 m long sediment core combined with high resolution seis- mic 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 wa- tershed. Increasing clastic input and organic productivity during the second half of the 20th century have also been recorded within the laminated sedi- ments, revealing an intensification of human impact and warmer water tem- peratures.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology

UniBE Contributor:

Anselmetti, Flavio

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0213-683X

Publisher:

Sociedad Geológica de España

Language:

English

Submitter:

Flavio Anselmetti

Date Deposited:

19 Jun 2015 11:34

Last Modified:

19 Jun 2015 11:34

BORIS DOI:

10.7892/boris.69648

URI:

https://boris.unibe.ch/id/eprint/69648

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