Discussion
Correctly match the regional stratigraphic sequence of the Western Dharwar Craton :
| A | B |
|---|---|
| (a) Sargur Group | (1) 3.3 - 3.4 Ga |
| (b) Gorur gneiss | (2) 3.3 - 3.1 Ga |
| (c) Closepet granite | (3) 2.5 - 26 Ga |
Answer: A
The correct match is a-2, b-1, c-3.
In the Western Dharwar Craton the Gorur gneiss is among the oldest basement rocks, dated to about 3.3-3.4 Ga (b-1). The Sargur Group supracrustal rocks, the oldest greenstone sequence, are dated to about 3.3-3.1 Ga (a-2). The Closepet granite, the large intrusion that separates the western and eastern parts of the craton, was emplaced at about 2.5-2.6 Ga, printed in the option as '2.5 - 26 Ga' (c-3).
The other codes either make the Sargur Group older than the Gorur gneiss or give the late Archaean Closepet granite an early Archaean age.
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