CSIR NET June 2016 Q84: Stratigraphy
Distinct Indian Precambrian tectonic provinces are characterized by diagnostic rock associations: Archean greenstone belts, Proterozoic Purana sedimentary basins, the Delhi fold belt, and the high-grade Eastern Ghats Belt.
Ophiolites with deformed metasedimentary rocks are characteristic of the Delhi fold belt (e.g., Phulad ophiolite suite) (A-Q). Fluvial-to-shallow-marine successions typify the Purana basins such as Cuddapah and Vindhyan (B-S). Metamorphosed volcanosedimentary sequences are the defining feature of Archean greenstone belts (C-P). Khondalites and charnokites are the classic high-grade granulite-facies rock types of the Eastern Ghats Belt (D-R). Option 1 (A-Q, B-S, C-P, D-R) is correct.
1) Correct — each rock association matches its well-documented tectonic province. 2), 3), 4) Incorrect — these misassign at least one rock type to an inconsistent province, e.g., pairing khondalite-charnokite (a classic Eastern Ghats signature) with the wrong belt.