Registro sedimentario en marmitas de erosión fluvial. Río Miño, Ourense

  1. Álvarez Vázquez, Miguel Ángel 1
  2. Ramírez Pérez, Alexandra María 1
  3. Uña Álvarez, Elena de 1
  4. Blas Varela, Esther de 1
  5. Prego Reboredo, Ricardo 2
  1. 1 Universidade de Vigo
    info

    Universidade de Vigo

    Vigo, España

    ROR https://ror.org/05rdf8595

  2. 2 Instituto de Investigaciones Marinas (IIM-CSIC)
Libro:
XV Reunión Nacional de Cuaternario Bizkaia Aretoa: Bilbao, 1-5 julio 2019. Libro de resúmenes

Editorial: Universidad del País Vasco = Euskal Herriko Unibertsitatea

ISBN: 978-84-17713-16-4

Ano de publicación: 2019

Páxinas: 206-209

Congreso: Reunión Nacional de Cuaternario (15. 2019. Bilbao)

Tipo: Achega congreso

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Resumo

The capacity of fluvial potholes to trap sediments led to the hypothesis that these deposits could serve as historical records. A sediment core, obtained from an erosion pothole, wasstudied. 11 samples (22 cm depth) were obtained. The 210Pb dating indicated that, in general, the pothole was gradually filled in the last 33-35 years. Using trace metals as indicators (Cu, Pb and V) it was possible to estimate their natural background (61±27 mgCu·kg-1, 72±45 mgPb·kg-1 and 19±4 mgV·kg-1). After calculating the normalized enrichment factor (NEF), the core showed indexes indicative of possible-moderate contamination for Cu and Pb (average contents 141±45 mgCu·kg-1 and 141±46 mgPb·kg-1), particularly in a layer (1993-2009) that seems to be a mixture of sediments of different ages, coinciding in time with humaninterventions in the local environment. Sediments trapped in potholes (as traps) showed potential to be used as historical records.

Fonte de datos: Dialnet