Figure 4. Stratigraphic units at Aljustrel. The coloured units represent
the most recent subdivision -- the volcanic units were identified by
Ore Systems Consulting using lithogeochemical data. The Fetais orebody
lies on rhyolite A and is overlain by rhyolite C, while the Moinho orebody
lies on rhyolite B. A quartz-feldspar porphyry which outcrops over much
of the central part of the Aljustrel area is interpreted to be largely
a subvolcanic mass, which locally fed small extrusive flows above the
level of the ores.
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