Formación de yeso autigénico en la llanura de inundación del río Tinto (Huelva)Implicaciones paleoambientales.
- Fernández Caliani, J.C. 1
- Galán, E. 2
- 1 Universidad Huelva, España
- 2 Universidad Sevilla, España
ISSN: 0213-683X
Year of publication: 1996
Issue Title: 21a Sesión Científica, Huelva 1996
Issue: 21
Pages: 101-104
Type: Article
More publications in: Geogaceta
Abstract
This paper describes the occurrence of authigenic gypsum on the flood plain of the Río Tinto, a river highly polluted by acid mine-drainage. Gypsum appears typically as isolated tabular crystals of selenite scatteres within the muddy sediment and associated with clay minerals, quartz, feldspars and halite. Both field and experimental data strongly suggest that the gypsum precipitated authigenicalIy on the mudflat as a result of the reaction of acidic sulphate waters with detrital and biogenic calcite localIy supplied by unpolluted tributaries. Consequently, in this case the presence of authigenic gypsum could be used as a paleoenvironmental indicator of the stream contamination.