Discussion
The Dharwar craton have experienced a regional metamorphism from north towards south grading into :
Answer: B
The Dharwar craton grades from greenschist through amphibolite to granulite facies from north to south.
Across Karnataka and Tamil Nadu the craton shows a progressive increase in metamorphic grade southwards: greenschist-facies schist belts in the north, amphibolite-facies gneisses in the middle, and charnockites and other granulite-facies rocks in the south, across the transition zone near Kabbaldurga and Krishnagiri. This tilted section exposes progressively deeper crust southwards.
Blueschist and eclogite are high-pressure rocks of subduction zones and do not form this regional sequence, and the Barrovian zones are a sequence of mineral zones in pelitic rocks rather than this craton-scale facies change.
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