Figure 5. Immobile-element plots of main rock units
at Aljustrel. Note that 5 different felsic units can be distinguished
using these plots, including samples with a wide range of alteration.
The variable effects of mass loss and mass gain produce the linear
data trends for each rhyolite type. Although rhyolites A and C overlap
in the upper plot, they are well separated in the lower (and other)
plots. The QFXT unit is a quartz-feldspar porphyry which has the silica
content of rhyolite, but TiO2 and FeO contents in the range of dacite.
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