Greisenisation and Permeability Changes in Granitic Intrusions Related to Sn-W Deposits: Case of Panasqueira - BRGM - Bureau de recherches géologiques et minières Accéder directement au contenu
Communication Dans Un Congrès Année : 2017

Greisenisation and Permeability Changes in Granitic Intrusions Related to Sn-W Deposits: Case of Panasqueira

Résumé

The W-Sn veins of Panasqueira are connected with a massive quartz-muscovite greisen cupola. This greisen results from interactions between granitic rock and acid Sn-W hydrothermal fluid, which causes the destruction of feldspars of the Panasqueira granite. Greisenisation can constitute an important factor of control on fluid flow, and its role on metal transport remains to be established. Mineral reactions of greisenisation involve a decrease of the rock volume and thus an increase porosity (~6%). Consequently permeability increases significantly (10-20 to 10-17 m²) enhancing fluid flow in the greisen cupola and promoting further hydrothermal alteration and transport of metals. Finally a part of the mineralization is trapped in this porosity, with precipitation of cassiterite and sulfides. Therefore, Sn-W fluids are able to generate their own pathways in initial impermeable granite via greisenisation reactions.
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Dates et versions

hal-01520216 , version 1 (10-05-2017)

Identifiants

  • HAL Id : hal-01520216 , version 1

Citer

Gaëtan Launay, Stanislas Sizaret, Laurent Guillou-Frottier, Eric Gloaguen, Jérémie Melleton, et al.. Greisenisation and Permeability Changes in Granitic Intrusions Related to Sn-W Deposits: Case of Panasqueira. SGA 2017, Aug 2017, Quebec, Canada. ⟨hal-01520216⟩
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