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Q25 (NDA-I/2016) Geography › Indian Physical Geography › Indian geology and tectonics Answer Verified

Consider the following statements : 1. Rajmahal highlands consist of lava flow deposits. 2. Bundelkhand gneiss belong to the oldest Achaean rocks of India. Which of the statements given above is/are correct? '

Result
Your answer: —  Â·  Correct: C
Explanation

Statement 1 is correct as the Rajmahal highlands, located in Jharkhand, are primarily composed of basaltic lava flows known as the Rajmahal Traps, which were formed during the Jurassic-Cretaceous period. These volcanic deposits characterize the plateau's physiography [1]. Statement 2 is also correct; the Bundelkhand gneiss consists of massive granitoid rocks that represent some of the oldest Archaean formations in India [1]. This complex is a granite-gneiss massif that forms part of the fundamental basement complex of the Indian craton, dating back to the early cooling and solidification of the Earth's crust. Research indicates these rocks include felsic crust dating as far back as 3.55 Ga, confirming their status among the oldest geological units in the country. Therefore, both statements accurately describe the geological characteristics of their respective regions.

Sources

  1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 1: Geological Structure and formation of India > ii) The Bundelkhand Gneiss > p. 5
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