Figure 19. Reconstruction of the regional setting of
the volcanic rocks and massive sulfide deposits of the Aljustrel area.
View is to the northwest. The host volcanic sequence is of Early Carboniferous
age, and is assumed to overlie the Phyllite-Quartzite Group (not seen
at Aljustrel, but forming the basement to other VMS deposits in the
Iberian Pyrite Belt). The Feitais and Estacao lie within the eastern
anticline at Aljustrel, whereas the St. Joao and Moinho deposits lie
within the western anticline. The nature of the felsic footwall differs
in these two areas. A large mass of quartz-feldspar porphyry which
occurs in the central Aljustrel area is interpreted as a largely subvolcanic
intrusion, although in the Moinho area it may have fed shallow sills
and thin flows. The quartz-feldspar porphyry was emplaced after sulfide
deposition in this model.
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