Modelos de especiación solubilidad de tierras raras en las soluciones termales de los sistemas de Caldas de Boí, Artiés, Tredós y Les (Pirineo Central; Lérida)

• Autores: Belén Buil Gutiérrez, S. García Sanz, Marceliano Lago San José, Enrique Arranz Yagüe
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 1, 2, 2000 (Ejemplar dedicado a: V Congreso Geológico de España (Alicante, 10-14 julio 2000)), págs. 41-45
• Idioma: español
• Enlaces
  • Texto Completo Ejemplar
• Resumen

  • The behaviour of rare earth elements (REE) in thermal waters from the Caldas de Bof, Artiés and Les geothermal systems (Central Spanish Pyrenees) has been modelled by means of spedation-solubility calculations. The model shows a marked tendency to complexation of the lanthanides,increasing this tendency at higher temperatures. The dominant complex species for light-REE (Lato Nd) is LnOH° at deep levels of the geothermal system, varying progressively to LnCOf+ athigher levels, near the surface. The spéciation of heavy-REE (Sm to Lu) is nearly invariable,being Ln(OH)4 the main species throughout the entire flow path. The spéciation of the lanthanidesis thus strongly dependent of temperature, being the REE-hydroxyl complexes dominant at the reservoir; the REE-carbonate complexes are formed, specially for the light-REE, as temperature lowers (and pH increases), during the ascent of the waters.