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The present day volumetric variation in the amount of mafic and felsic volcanic rocks preserved in the Parana and Etendeka provinces is interesting.
The enclaves probably represent globules of mafic magma in felsic magma.
The alternating bands of mafic and felsic minerals are a striking and distinctive feature of all gneisses.
Local hybridization between the mafic and felsic magmas is common.
The rocks of the complex show an overall trend of decreasing mafic minerals and increasing felsic minerals spatially from west to east.
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