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Título: | Environmental geochemistry of volcanic ashes from the Southern Puna, NW Argentina |
Autor: | Ruggieri, Flavia CSIC ORCID; Fernandez-Turiel, J. L. CSIC ORCID ; Gimeno, D.; García-Vallés, M.; Saavedra Alonso, Julio CSIC ORCID | Fecha de publicación: | jun-2009 | Editor: | Elsevier | Citación: | Geochimica et Cosmochimica Acta 73(13) Supl 1: A1130 (2009) | Resumen: | Twenty-one rhyolitic volcanic ash deposits were sampled in the Southern Puna plateau (NW Argentina). The goal of this study is contribute to define a specific analytical methodology for environmental characterization of volcanic ash, as well as recognize the geochemical impact of such materials on the environment mainly on natural water. The SEM examination allows recognize the ash by the presence of glass shards. In addition, the coupling with EDX spectrometry provides a complementary way to identify compositionally glass and crystalline phases and to compare ashes of different eruptions. Whole rock geochemistry and two types types of leachates (deionised water and nitric acid) were performed on these samples allowing to follow the environmental behaviour of about 50 major and trace elements. The analyses were carried out by ICP-OES and ICP-MS. Significant differences have been reported in the two types of leachates with, generally, higher concentrations in the acid leachate, whereas Si and B were enriched in water leachate. Both leaching results have demonstrated high levels of Ca, Na, and Si as the most abundant cations, while SO4 and Cl are the most abundant anions. High concentrations of B, Co, Cu, Ni, Rb, V, and Zn were also reported in both leachates, while only high levels of As, Br, Cs, Mo, Pb, and Se were observed in acid leachate. The comparison of the leachates and the bulk compositions of the ash (expressed as Relative Mass Leached, RML, %) shows in acid leachates a high mobility (40-90%) for P and Zn, and a moderate mobility (20-40%) was presented by Ca, Ni, Cu, and As. In water leachate, the behaviour is more complex with a large variability between ash samples. In general, the RMLs are lower than 20% for water leachates. However, in some ashes some elements risen 40-90% RML (P, Sb, and Zn). | Descripción: | 1 página.-- Resumen del trabajo presentado en la 19th Annual V.M. Goldschmidt Conference, V.M. Goldschmidt Conference. | Versión del editor: | http://dx.doi.org/10.1016/j.gca.2009.05.014 | URI: | http://hdl.handle.net/10261/31820 | DOI: | 10.1016/j.gca.2009.05.014 | ISSN: | 0016-7037 |
Aparece en las colecciones: | (Geo3Bcn) Artículos (IRNASA) Artículos |
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