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

  1. M. Morellón 5
  2. F.S. Anselmetti 6
  3. B.L. Valero-Garcés 1
  4. F. Barreiro-Lostres 1
  5. D. Ariztegui 2
  6. S. Giralt 3
  7. A. Sáez 4
  8. M.P. Mata 7
  1. 1 Instituto Pirenaico de Ecología
    info

    Instituto Pirenaico de Ecología

    Zaragoza, España

    ROR https://ror.org/039ssy097

  2. 2 University of Geneva, Suiza
  3. 3 Instituto de Ciencias de la Tierra Jaume Almera
    info

    Instituto de Ciencias de la Tierra Jaume Almera

    Barcelona, España

    ROR https://ror.org/01nsd7y51

  4. 4 Universitat de Barcelona
    info

    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

  5. 5 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  6. 6 University of Bern, Suiza
  7. 7 Instituto Geológico y Minero de España
    info

    Instituto Geológico y Minero de España

    Madrid, España

    ROR https://ror.org/04cadha73

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Revista:
Geogaceta

ISSN: 0213-683X

Año de publicación: 2015

Título del ejemplar: Comunicaciones presentadas en la LVII Sesión Científica / Madrid, 27-28 de Noviembre de 2014

Número: 57

Páginas: 119-122

Tipo: Artículo

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Otras publicaciones en: Geogaceta

Resumen

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.

Fuente de los datos: Dialnet