Abstract
Petrochemical and 18O/16O results are presented concerning the occurrence of tungsten skarn deposits associated with Hercynian granitoids in the (E-) Pyrenees and NW Portugal. The investigation comprises a comparison of the bulk-rock, major trace element and oxygen isotope behaviour of granitoids in the ‘I-type’ Pyrenean and ‘S-type’ Portuguese magmatic suites. In more detail the magmatic and post-magmatic element distributions and 18O/16O characteristics are compared of the W-skarn associated granites of Costabonne and Covas, the (almost) W-barren granite of Batère and the Arga granite which is associated with Sn-(Ta-W) aplopegmatitic mineralizations.
The evidence presented does not point to a significant magmatic differentiation between ‘W-skarn associated’ granitoids and granitoids without W-skarn formations. In the investigated areas in the (E-)Pyrenees and NW Portugal, however, the more important W-skarn deposits of Costabonne and Covas (and also Salau ?) appear to be preferentially related to calcalkaline biotite granites-granodiorites with a primary zonal distribution of the refractory elements, and with δ18OWR(SMOW) = 8.5-9.5‰.
In contrast to the (almost) W-barren situations at Batère and Arga, the geochemical data from the W-skarn associated granitoids of Costabonne and Covas reveal a statistical correlation between copper and zinc, and comparable Symap contour plots showing elevated Cu-Zn dispersions pointing towards the skarn deposits. The elevated Cu-Zn dispersions seem to be good indicators of areas with an increased activity of the dominantly magma-derived metasomatic fluids which, in favourable country rocks (marbles or calc-silicate rocks), may produce contact metasomatic skarn deposits with ore-grade tungsten contents.
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Salemink, J., De Jong, A.F.M. (1988). Petrochemical and 18O/16O Characteristics of ‘W-Skarn Associated’ and ‘W-Barren’ Granitoids in the (E-) Pyrenees and NW Portugal. In: Boissonnas, J., Omenetto, P. (eds) Mineral Deposits within the European Community. Special Publication No. 6 of the Society for Geology Applied to Mineral Deposits, vol 6. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-51858-4_4
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