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Abstract
THE area (17° 37′ 30″–17° 54′ N and 83° 12′–83° 29′ E) which I have mapped1 has revealed an important group of the charnockite series of rocks. These include charnockite (quartz, feldspar, hypersthene, magnetite rook) and garnetiferous charnockite in the acid division, and gabbro, riorite, hornblende norite, biotite norite and amphibolite in the basic division. They occur mostly as sills and rarely as dykes and stocks in the khondalite (quartz, feldspar, garnet, sillimanite gneiss) and leptynite (quartz, feldspar, garnet granulite). A detailed study of the orthopyroxenes of the charnockite and the norite has revealed certain interesting features, which are reported in the present communication.
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