Correct Option
The correct option is
2 and 3 only
.Explanation
The Northeastern Plateau, comprising the Meghalaya Plateau and the Karbi-Anglong Plateau, is geologically a part of the Peninsular Block. It is distinct from the Himalayan ranges in terms of origin, structure, and rock composition.
Statement-wise Analysis
- Statement 1 is Incorrect: The Northeastern Plateau is not an extension of the Himalayan mountain chain. It is actually an extension of the Peninsular Plateau. While the Himalayas are young fold mountains, the Northeastern Plateau consists of ancient stable landmasses similar to the Chotanagpur Plateau.
- Statement 2 is Correct: During the time of the Himalayan origin and the movement of the Indian plate towards the Eurasian plate, a huge fault was created between the Rajmahal Hills (part of the Peninsular block) and the Meghalaya Plateau. This depression, often referred to as the Malda Gap, was subsequently filled by the deposition activity of numerous rivers.
- Statement 3 is Correct: Since the Meghalaya plateau is geologically a part of the Peninsular block, it shares a similar mineral profile. It is rich in mineral resources such as coal, iron ore, sillimanite, limestone, and uranium.
Key Takeaway: The Meghalaya Plateau is physically separated from the main Peninsular Block by the Malda Gap (or Garo-Rajmahal Gap) but is geologically identical to it, unlike the adjacent Purvanchal hills which are part of the Himalayan system.