Which of the following statements relating to Dharwar geological system are correct? 1. They belong to Archaean geological period 2. They are metamorphosed sedimentary rocks 3. They are of great economic importance for its mineral resources 4. They are found predominantly in Karnataka, Tamilnadu, Odisha and Jharkhand Select the correct answer using the code given below :

The Dharwar geological system represents the first metamorphosed sedimentary rock systems in India, formed between 2500 and 1800 million years ago [2]. These rocks belong to the late Archaean and early Proterozoic periods, often referred to as the Archaean Basement Complex or Dharwar Supergroup [1]. They are of immense economic importance as they are the primary source of India's metallic minerals, including high-grade iron ore, manganese, gold, copper, and lead [3]. Geographically, the system is widely distributed across the Indian shield. It is found predominantly in Karnataka (Dharwar and Bellary districts), Tamil Nadu (Nilgiris), Odisha (Mayurbhanj and Keonjhar), and Jharkhand (Singhbhum and the Chotanagpur Plateau) [3]. Since all four statements accurately describe the age, composition, economic value, and distribution of the Dharwar system, option 1 is correct.

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 1: Geological Structure and formation of India > DHARWAR SYSTEM (PROTEROZOIC FORMATIONS) > p. 7
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 2: Physiography > 2. The Dharwar System > p. 50
3. [3] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 1: Geological Structure and formation of India > DHARWAR SYSTEM (PROTEROZOIC FORMATIONS) > p. 10