Abstract

Recent studies on the Proterozoic Namaqua mobile belt in the south-western part of Africa have revealed the widespread presence of granolites (orthopyroxene-bearing metamorphites) and charnockitic rocks (orthopyroxene-bearing intrusions) throughout the 800-km exposed length of the belt. Intermediate-pressure granolites are preserved in at least nine widely scattered areas, in places partially overprinted by later amphibolite facies metamorphism. Numerous charnockitic intrusions, in places partially amphibolitized, have been reported from fifteen areas, in at least seven of which they are associated with granolites. The abundance and scale of these occurrences greatly amplify the importance of the mid-Proterozoic granulite metamorphism proposed by T. N. Clifford.

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