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Authors
Advisor(s)
Abstract(s)
The Vale de Pães (Cuba-Vidigueira) mineralisation is composed of magnetite ± sulphides and hosted
in a Pre-Variscan metamorphic sequence intruded by igneous rocks belonging to the Beja Igneous Complex.
Its mineral and chemical features are compatible with a zoned Fe-skarn: Mg-rich (Fo + Di90, oxidised)
and Ca-rich (Grs + Di81-39, oxidised or relatively reduced). In the Fe-Mg skarn, magnetite deposition
occurred along with the anhydrous mineral assemblage at ≈ 600 °C; sulphides precipitated from the
retrograde stage onset (≤ 550 °C) and during the hydrated and carbonate phases formation period
(< 420 °C). In the Fe-Ca skarn, magnetite precipitated during the retrograde stage (< 550 °C) together
with the hydrated mineral association, and was followed by sulphides at ≈ 400°C. The mineralising
process involved moderate-high salinity fluids and was controlled by variations in redox potential and pH.
Description
Keywords
Chemical zoning Ossa Morena Zone
Pedagogical Context
Citation
Salgueiro, R.; Inverno, C. & Mateus, A. (2010). Main characteristics and genesis of the Vale de Pães skarn (Cuba-‐Vidigueira, Ossa Morena Zone, Portugal). Estudios Geológicos, doi: 10.3989/egeol.40150.101
Publisher
Consejo Superior de Investigaciones Científicas