Discussion
The Palghat-Cauvery shear zone comprises :
Answer: A
The keyed answer is charnockite interbanded with khondalites.
The Palghat-Cauvery shear zone, which separates the Dharwar craton from the Madurai block in south India, cuts through high-grade granulite-facies terrain. Its dominant rocks are charnockites and hornblende-biotite gneisses, interlayered with metasedimentary garnet-sillimanite (khondalitic) gneisses and quartzites, the association that option A names.
Tonalite-trondhjemite-granodiorite gneisses with dolerite dykes and greenstone belts are the typical low-grade associations of the Dharwar craton to the north. Anorthosite bodies such as Sittampundi do occur in the zone, but an association that leaves out the charnockites does not describe it.
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