Rendiconti Online della Società Geologica Italiana - Vol. 59/2023

Deciphering the diagenetic evolution of the lower Carnian succession in the Gorno and Pian Resinelli sulphide mining districts (Southalpine Domain, N Italy)

Luca Summino1, Michele Giorno2, Luca Barale3, Carlo Bertok1 & Luca Martire1
1Dipartimento di Scienze della terra, Università di Torino, Italia.
2Helmholtz Institute Freiberg for Resource Technology, Freiberg, Germany.
3CNR-IGG, Unità di Torino, Italia.
Corresponding author e-mail:

Volume: 59/2023
Pages: 97-104


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.


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