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Weathering of granodiorite and micaschists, and soil pollution at Mt. Mottarone (northern Italy)

Published online by Cambridge University Press:  05 July 2018

E. Salvioli-Mariani ,
L. Toscani  and
G. Venturelli
E. Salvioli-Mariani*
Affiliation:
Dipartimento di Scienze della Terra, Parco Area delle Scienze 157/a, 43100 Parma, Italy
L. Toscani
Affiliation:
Dipartimento di Scienze della Terra, Parco Area delle Scienze 157/a, 43100 Parma, Italy
G. Venturelli
Affiliation:
Dipartimento di Scienze della Terra, Parco Area delle Scienze 157/a, 43100 Parma, Italy
*
*E-mail: salvioli@unipr.it
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Abstract

At the top of Mt. Mottarone a thin level of micaschist, covered by soil, rests on granodioritic rocks. Both rock types underwent weathering with generation of new minerals and variation of the original chemical composition. The weathering produced phyllosilicates and Fe- and Al-hydroxides. Mass balance calculations on the basis of Zr immobility indicate that at least As, Bi, Cd, Mo and Sb were added to the micaschist, whereas the other elements were removed; the soil was also enriched in As, Bi, Cd, Mo and Sb during weathering. Dry and wet pollution was responsible for the addition of the elements listed above. On the other hand, Ca, Na, Mo and Sr were surely removed from the granodiorite during weathering, whereas Bi and Cu were added by percolation from the overlying micaschist. The chemical features of a spring issuing from granodiorite agree well with the element budget as deduced from the rock transformation. This is not the case, however, for a spring issuing from the micaschist.

Keywords

rock weatheringelement mobilitysoil pollutionMt. Mottaronenorthern Italy
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 3 , June 2001 , pp. 415 - 425
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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