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| Belluno nappe | |
|---|---|
| Name | Belluno nappe |
| Type | Nappe |
| Region | Veneto |
| Country | Italy |
| Coordinates | 46°10′N 12°13′E |
| Period | Mesozoic–Cenozoic |
| Lithology | Carbonate, clastic, evaporite |
| Overlies | Southalpine units |
| Underlies | Alpine thrust sheets |
Belluno nappe The Belluno nappe is a tectonostratigraphic complex in the Veneto region of northern Italy near Belluno, Veneto and the Dolomites. It is a key element in studies of the Alps and Southern Alps, linking fieldwork around Cortina d'Ampezzo, Val Belluna and the Piave River to broader reconstructions of the Tethys Ocean and Adriatic Plate evolution. Research on the unit intersects work by institutions such as the University of Padua, University of Trieste, Italian Geological Survey, and international programs including the European Geosciences Union and the International Union of Geological Sciences.
The unit crops out in the Dolomites, around Cortina d'Ampezzo, Feltrino, and the Agordino area and forms part of the upper-plate assemblage above the Southalpine fold-and-thrust belt, adjacent to the Periadriatic Seam and the Sesia-Lanzo Zone. Its distribution is documented in maps by the Servizio Geologico d'Italia and regional geological maps produced by the Regione Veneto. The nappe records depositional links to the Tethyan realm, correlations with the Carnian Pluvial Episode, and ties to carbonate platforms comparable to those of the Dolomia Principale and Garnet Zone sequences.
Stratigraphically, the complex comprises Upper Triassic to Eocene successions including dolostone-dominated sequences, Ladinian–Carnian limestones, Jurassic marls, and Cretaceous pelagic limestones with sporadic evaporite layers. The succession shows lateral equivalents to the Bellerophon Formation and to the Werfen Formation in the Northern Calcareous Alps, and stratigraphic ties with the Belluno Basin facies and the Carnic Alps systems. Fossil content has affinities with assemblages recorded at Monte San Giorgio, Burgess Shale analogs, and other Tethyan fossil sites.
Structurally the nappe is a thrust sheet emplaced during the Alpine orogeny and involved in the emplacement chronology that includes interaction with the Periadriatic fault system, the Fella-Sava Fault, and the Giudicarie Line. Deformation phases correlate with regional events recorded in the Penninic and Austroalpine domains. Nappe stacking, duplex formation, and back-thrusting in the area relate to models proposed by researchers working on the Alps Project, Swiss Geological Survey collaborations, and teams from the University of Innsbruck. The kinematics of thrusting tie to plate convergence between the African Plate and the Eurasian Plate and to microplate motions of the Adriatic microplate.
Metamorphic overprints in the complex are generally low-grade, with contact and burial metamorphism producing zeolites, low-grade chlorite, and sparse phyllosilicates. Petrographic studies document recrystallized dolomite, microsparitic calcite, and authigenic minerals comparable to those described from Scandinavian Caledonides and the Apennines. Fluid inclusion studies and stable isotope work link diagenesis to fluids similar to those recorded in the Ligurian-Provençal Basin and in Carpathian analogues. Metamorphic assemblages have been compared with those in the Sesia Zone and the Koralpe-Saualpe Complex.
Numerical dating across the nappe uses techniques applied at the Max Planck Institute for Chemistry, GFZ German Research Centre for Geosciences, and laboratories at the University of Milano-Bicocca and ETH Zurich. Methods include ion microprobe U-Pb on detrital zircon populations, Ar-Ar dating on syn-tectonic mica phases, and Sr isotope stratigraphy calibrated against the Geologic Time Scale from the International Commission on Stratigraphy. Ages constrain deposition to Triassic–Cretaceous intervals and emplacement pulses to Paleogene–Miocene times, correlating with regional tectonic pulses recognized in the Pyrenees and the Carpathians.
The lithologies host potential reservoirs and raw materials exploited historically and currently in the Veneto. Carbonate quarries around Vicenza and Treviso exploit dolostone and limestone similar to Belluno lithologies, and local mined materials feed construction and dimension stone markets in Venice and Padua. Secondary mineralization includes base-metal mineral occurrences analogous to those in the Zurzach mine and the Ramble Memor districts, with talc, barite, and minor sulfide occurrences reported in regional surveys by the European Commission geological initiatives and exploited by companies registered in Milan and Verona.
Key studies began with mapping by 19th-century geologists working in association with the Geological Society of London and Italian pioneers active in Vienna and Rome, and advanced through 20th-century syntheses by researchers affiliated with the University of Padua, University of Bologna, and the Natural History Museum, London. Modern integrative work combines field geology from teams at University of Geneva, University of Lausanne, University of Basel, and University of Barcelona with geochemistry from ETH Zurich and geophysics from the European Seismological Centre. Influential publications appeared in journals such as articles supported by the European Geosciences Union and international conferences including meetings of the International Geological Congress and the Alpine Geological Conference.