Impacto ambiental de la interacción agua-ceniza en la erupción del 2011 del volcán Grimsvötn (Islandia)

• Main Authors: Cabré, J., Aulinas, M., Rejas, Marta, Fernandez-Turiel, J. L.
• Other Authors: Ministerio de Economía y Competitividad (España)
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Sociedad Geológica de España 2016
• Subjects: flujo geoquímico; volcán Grímsvötn; leaching experiments; volcanic ash; Grímsvötn volcano; geochemical flux; ensayos de lixiviación; Ceniza volcánica; Ceniza; Freed; Islandia
• Online Access: http://hdl.handle.net/10261/148490; https://doi.org/10.13039/501100003329

The Grímsvötn volcanic eruption, from 21 to 28 May, 2011, was the largest eruption of the Grímsvötn Volcanic System since 1873. The main geochemical features of the potential environmental impact of the volcanic ash-water interaction were determined using two different leaching methods as proxies (batch and vertical flow through column experiments). The main findings reveal that Na, K, Ca, Mg, Si, Cl, S and F show the largest geochemical fluxes caused by the interaction of water and ash. Additionally, the significant amounts of some of these elements (Ca, S and Mg) together with P, Cl, Fe, which are usually considered as macro/micronutrients, demonstrates the fertilising potential of the May 2011 emitted ash. On the other hand, release of F highlights the possible environmental problems arising from ash fallout on land or into fresh water syste ms. It is noteworthy that the chemical release is maximal during the first few hours of contact between tephra and water due to the dissolution of soluble salts from the ash surface. As time progresses, these constituents are exhausted, the release drops considerably and elements are freed instead by the incongruent dissolution of the volcanic glass. Este trabajo ha sido financiado por el proyecto QUECA (MINECO, CGL2011-23307). Peer Reviewed