Petrology of granulite facies rocks in Ukwortung area of Obudu Plateau, southeastern Nigeria

Abstract

Rocks of the Ukwortung area of Obudu, southeastern Nigeria consist of pyroxene –biotite –, garnet-biotite-gneisses and meta-utramafite. These rocks were intruded by various granites and pegmatites during the pan-African thermotectonic event. The presence of hypersthene, plagioclase (An38-46), hornblende and antiperthitic intergrowths in the rocks of Ukwortung indicate uppermost amphibolite to granulite facies metamorphic conditions were attained. This high –grade metamorphism was followed by retrogression to amphibolite facies grade.
[Global Jnl Geol. Sci. Vol.1(2) 2003: 159-168]