Estudio de marcadores ambientales sedimentarios y geoquímicos en los sedimentos del estuario de los ríos Tinto y Odiel

  1. López González, Nieves
Supervised by:
  1. José Borrego Flores Director
  2. Juan Antonio Morales González Director

Defence university: Universidad de Huelva

Fecha de defensa: 14 July 2009

  1. Federico Vilas Martín Chair
  2. Belén Rubio Armesto Secretary
  3. Víctor Díaz del Río Español Committee member
  4. Germán Santos Flor Rodríguez Committee member
  5. José Antonio Grande Gil Committee member

Type: Thesis


The study of the geochemical features of the Tinto and Odiel estuarine sediments has allowed establishing a set of environmental proxies related to processes and sources of pollution, as well as the evolution of the environmental conditions during Holocene. Processes of saline mixing and acid neutralization that take place in the estuary have a strong influence on heavy metal and other trace elements behaviour, whose variation along the geological record is linked to the location of the estuarine mixing areas. The light REE show anomalous behaviour regarding to other systems not affected by acid drainage and their variation has allowed identifying three fractionation patterns depending on the pH conditions. The heavy metal pollution in the sediments has been evaluated by the combination of the enrichment factors and the exchange ability according to the degree of association with labile phases.