The impact of dolomite and plagioclase weathering on the chemistry of shallow groundwaters circulating in a granodiorite-dominated catchment of the Sila Massif (Calabria, Southern Italy)

摘要: Abstract This work is aimed at investigating the weathering processes of granodiorites cropping out in a small catchment Sila Massif. The mineral constituents this granodiorite are plagioclase, often zoned with Ca-rich core and Na-rich rim, quartz, chlorite, K-feldspar, white mica epidote. During study, dolomite was discovered local stream sediments, as separate monomineralic grains, probably resulting from erosion veins cutting crystalline rocks. Prevailing dissolution foreign plagioclase suggested by Ca–Mg–HCO3 chemical composition groundwaters waters, which rather unexpected for waters interacting granitoid These qualitative observations quantitatively confirmed reaction path modelling occurring study area, carried using EQ3/6 software package, version 8.0, Double Solid Reactant Method. Indeed, it possible to ascertain that release both major dissolved several trace elements (Ba, Co, Cr, Fe, Mn, Ni, Pb, Sr, V Zn), rocks chiefly controlled plagioclases.