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The perigranitic W-Au Salau deposit (Pyrenees, France): polyphase genesis of a late Variscan intrusion related deposit

Thomas Poitrenaud 1, * Eric Marcoux 1, 2 Romain Augier 1 Marc Poujol 3 
* Corresponding author
2 Métallogénie - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
Abstract : Afield study combined with a laboratory study and 3D modeling have been performed in orderto decipher the genesis of the Salau deposit W-Au mineralization (Pyrenees, France), one of the mostimportant for tungsten in Europe. Results show the existence of two superimposed ore types, emplaced ca.10 km depth and within decreasing temperature conditions: a calcic silicates skarn with rare scheelite anddisseminated sulphides followed by a mineralized breccia with massive sulphides (pyrrhotite andchalcopyrite dominant), coarse-grained scheelite and gold, representing the main part of the ore mined in thepast. This breccia is localized in ductile-brittle shear-zones which crosscut the granodiorite. U/Pb dating onzircon, apatite and scheelite, previously realized, confirmed this polyphase evolution. These two types ofmineralization, linked to the emplacement of two successive intrusions as confirmed by sulphur isotopicanalysis, granodioritic then leucogranitic, can be classified as belonging to the Intrusion-Related GoldDeposit type (IRGD). The emplacement of the high-grade gold and scheelite breccia was initiated by theprogressive localization of the regional deformation in the Axial Zone of the Pyrenees during the Permianwithin E-W dextral-reverse faults.
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Submitted on : Wednesday, April 21, 2021 - 2:54:45 PM
Last modification on : Wednesday, August 3, 2022 - 4:05:37 AM


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Thomas Poitrenaud, Eric Marcoux, Romain Augier, Marc Poujol. The perigranitic W-Au Salau deposit (Pyrenees, France): polyphase genesis of a late Variscan intrusion related deposit. Bulletin de la Société Géologique de France, Société géologique de France, 2020, Special Issue Minéralisations périgranitiques ed. E. Marcoux, 192, pp.22. ⟨10.1051/bsgf/202004⟩. ⟨insu-03053991⟩



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