Distribuzione di Fe, Mn, Ti, P, Cr, Zn, Cu, Pb nei suoli delle vulcaniti ladiniche delle alpi Vicentine. Rapporti fra magmatismo medio-triassico e mineralizzazioni piombo-zincifere del Recoarese.

With the aim of solving the problem of the metallogenesis of the Middle Triassic Pb-Zn deposits of the Alps, an investigation was begun on the distribution of some significant elements in the soils of the Ladinian volcanics of the Recoaro area. Analysis of an initial group of elements indicates: 1) the existence of geochemical correlations between soils and host rocks with, in both cases, increasing Fe, Ti, Cu and Cr contents towards more basic rocks; 2) local anomalies and a large area rich in Pb, Zn + or - Cu, due to disseminated sulphides or vein concentrations in the volcanics or in masses at the contact between these and the Anisian limestones; 3) correspondence between abnormal areas and zones of volcanic propylitization and argillification. S and metals are related to the residual fluids resulting from crystallization of deep magmatic masses which crossed the volcanics, giving rise to intense transformations and sulphide deposition. -J.M.H