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Distribution of trace elements in altered pyroclastites from Monte Vulture volcano (southern Italy)

Authors: Fiore S; Huertas FJ; Linares J; Piccarreta G;

Distribution of trace elements in altered pyroclastites from Monte Vulture volcano (southern Italy)

Abstract

En un trabajo previo se estudiaron tres depósitos piroclásticos, considerados como paleosuelos, del área volcánica del Monte Yulture (Potenza, Italia) para deducir su grado de meteorización. En el presente trabajo se estudia el comportamiento de algunos elementos traza (Ce, La, Ba, Ni, Cr, Y, Rb, Sr, Y, Zr, Nb) en esos depósitos para intentar obtener una imagen geoquímica más completa. Se ha estudiado la distribución de elementos traza en la roca total y después de un ataque con pirosulfato-Na (residuo + solución). Ba y Sr parecen estar controlados por los cristales del residuo (piroxenos, feldespatos, anfíboles y accesorios); La, Ce, Y y Nb se concentran más en la solución, es decir en los componentes vítreos, alofana, geles Fe-SiAl, biotita carbonatos y analcima; Y, Cr y Ni no muestran ninguna tendencia a concentrarse en una fracción concreta. Hay que resaltar que La, Ce, Y, Y, Cr y Ni aumentan con la profundidad en la unidad inferior, junto con el contenido en geles y en alofana. Este comportamiento puede ser debido a fluctuaciones del nivel freático, como se deduce por la presencia de un nivel calcáreo en la unidad superior. Se concluye que los estados precoces de meteorización no afectan prácticamente a la distribución de los elementos traza, y que las interpretaciones sobre los cambios químico sufridos por las rocas piroclásticas deben hacerse sólo después de un detallado análisis.

Country
Italy
Keywords

QE1-996.5, Trace elements, Weathering, Elementos traza, trace elements, Geology, Meteorización, meteorización, elementos traza, piroclastitas, Piroclastitas, weathering, Pyroclastites, pyroclastites

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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