Abstract

At the southwestern border of the Adamello batholith metasomatic garnet-vesuvianite veins occur within the contact metamorphic marble sequence of the Prezzo formation. The veins are c h a r a c t e r i z e d by the assemblage garne t ( C a 3 A l l o F 3+ 9 eo.4SisO12) + v e s u v i a n i t e (Ca19Mg1.2Fel.2Allo.4Tio.zSilsO69[(OH)r.sFl.5) + clinopyroxene (CaMgo.sFeo.2Si2Or) + wollastonite + calcite + pyrrhotite (FeSI.1). Within the veins irregularly shaped microscopic domains with different degrees of silicification can be distinguished. Graphite is present in the contact metamorphic Prezzo Marble at 0.5 wt% concentration, but is absent in the metasomatically altered rocks.

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