Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

The stratabound Mississippi Valley-type (MVT) sulphide deposits of the Gorno
and Piani Resinelli mining districts are hosted in the lower Carnian carbonate
succession, mainly peritidal limestones, of the Lombardian Basin (Southalpine
Domain, Northern Italy). In addition to the formation of the well-known sulphide
deposits, these carbonate sediments experienced a complex diagenetic evolution,
including different stages of dolomitization, silicification, dissolution, brecciation,
calcite cement precipitation. Stratigraphic and petrographic features suggest
that, apart from an early calcite cementation and a first penecontemporaneous
dolomitization affecting the supratidal beds, diagenetic processes and sulphide
precipitation, are intimately and genetically associated. They document the
occurrence of a Carnian hydrothermal system developed shortly after deposition
at shallow burial depth, confirmed by fluid inclusion microthermometry and U-Pb
radiometric datings.