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- W1991843463 abstract "Abstract Migmatites consisting mainly of lit-par-lit gneisses form one of the most dominant metamorphosed rocks in the Oban massif of southeastern Nigeria. Banded schists and agmatites are the other mixed rocks recognized in the area. The lit-par-lit gneisses are composed of quartz, feldspar (leucocratic portion) and biotite, chlorite, garnet (melanocratic portion). They are extensively sheared, fractured and folded. The dominant fold axes trend N-S parallel to the regional foliation of the rocks. Chemical data show that the lit-par-lit gneiss is granodioritic in composition. The agmatite is restricted in occurrence. Banding is rare in the agmatite but dissection of the paleosome by quartzo-feldspathic veins is common. The agmatite is quartz-dioritic in composition. The banded schist is coarse-grained and contains index minerals: garnet, kyanite and sillimanite, indicating that the area underwent high-grade metamorphism of the Barrovian type. It is pelitic in composition. These migmatitic rocks were formed by partial melting, metamorphic segregation and injection due to high-grade metamorphism. The migmatitic gneiss yielded a RbSr isochron age of 150±11 Ma whilst the migmatitic schists gave an age of 527±16 Ma." @default.
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- W1991843463 date "1992-07-01" @default.
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- W1991843463 title "RbSr age of Pan-African migmatites in the Oban massif of southeastern Nigeria" @default.
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- W1991843463 doi "https://doi.org/10.1016/0899-5362(92)90007-y" @default.
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