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Article Dans Une Revue Geology Année : 2024

Cenozoic Pb−Zn−Ag mineralization in the Western Alps

Minéralisations Cénozoïque à Pb−Zn−Ag dans les Alpes occidentales


Metallogenic models of polyphase mountain belts critically rely on robust geochronology. We combine petrology with Rb−Sr and U−Th−Pb in situ geochronology, paired at thin-section scale, to date mineralization in deformed hydrothermal Pb−Zn−Ag deposits along an east-west transect in the Western Alps, France. The Pb−Zn−Ag veins occur in shear zones with kinematic structures consistent with the mylonitized host rocks. The ore consists mainly of galena in a quartz-phengite gangue. The paragenesis can be related to hydrothermal crystallization during periods of variable strain. Both isotope systems yield only Cenozoic ages (ca. 35 Ma and 15−20 Ma) without any pre-Alpine inheritance, clearly indicating orogenic mineralization. The metallogenic model proposed here includes significant fluid circulation along major tectonic contacts between basement and sedimentary cover during Alpine convergence.
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hal-04467825 , version 1 (20-02-2024)



maxime bertauts, Adrien Vezinet, Emilie Janots, Magali Rossi, Isabelle Duhamel-Achin, et al.. Cenozoic Pb−Zn−Ag mineralization in the Western Alps. Geology, 2024, ⟨10.1130/G51818.1⟩. ⟨hal-04467825⟩
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