The Dharwar system is older than the Archean system, but not as old as the others. From 2500 million years ago to 1800 million years ago, the Dharwar era of rock creation was mostly constant. They are known as the Dharwar system since they were initially examined in the Karnataka area of Dharwar. This article will explain to you about the Dharwar System which will be helpful in Geography preparation for the UPSC Civil service exam.

Dharwar System

• The Dharwar system is older than the Archean system, but not as old as the others.
• From 2500 million years ago to 1800 million years ago, the Dharwar era of rock creation was mostly constant.
• The Dharwar Rock System is unique in that it is India's earliest metamorphic sedimentary rocks.
• Due to being initially examined in the Dharwad district of Karnataka, they are known as the Dharwar system.
• However, they may be found in the Aravallis, Tamil Nadu, Chotanagpur plateau, Meghalaya, Delhi, and the Himalayas.
• Iron ore, manganese, lead, zinc, gold, and silver are all abundant in the Dharwar rocks.

Formation of Dharwar Rocks

• The erosion and sedimentation of the Archaean system's rocks resulted in the formation of these rocks.
• The earliest sedimentary rocks are these.
• No fossils have been discovered here.
• This is because either there was no genesis of species during the development of the fossils or the forms of the fossils were obliterated through time.
• The Aravali mountain range, the world's oldest fold mountain range, was built from these rocks.
• This system's rocks may be found in the Karnataka districts of Dharwad and Shimoga.
• This system's rocks may be found from Karnataka to the Kaveri river, in the districts of Bellary and Shimoga, the Sasar mountain range in Jabalpur and Nagpur, and the Champaner mountain range in Gujarat.
• This system's rocks may be found in the Himalayan ranges of Ladakh, Zaskar, Garhwal, and Kumaon, as well as the Assam plateau's long range.
• The rocks in this system are extremely valuable commercially. These rocks contain all of the major metallic minerals (iron, gold, manganese, and so on).

Dharwar System - India

• This system contains the Champions series, which has gold mines. The Champion reef in the Kolar Gold Fields is the inspiration for this system. One of the world's deepest gold mines is found in the Kolar Gold Fields.
• The following are the other Dharwar system series:
• Near Baroda, there is a Champaner series. This is the source of a beautiful green marble variation.
• Closepet series found in Madhya Pradesh's Balaghat and Chhindwara. It has a lot of copper ores.
• The Chilpi Series, which can be found in and around the Closepet series in Balaghat, and the Chhindwara Iron-Ore Series, which can be found in the Singhbhum, Mayurbhanj, and Keonjhar ranges.

Distribution of Dharwar Rocks

• The location in which Dharwar rocks are found and the type of metal present in them are used to classify them into different series.
• For example, the Champions series (gold) from Kolar, the Champaner series (marble) from Baroda, and the Chilpi series (copper) from Balaghat.
  • Champion Series: Named after the Champion Reef in Mysore's Kolar Gold Field; found in Kolar and Raichur districts. The area is known for its gold reserves.
  • Champner Series: Aravalli system outlier found in Vadodara; abundant in quartzite, conglomerates, phyllites, slates, and marbles (green variety).
  • Chilpi Series: Found in Madhya Pradesh's Balaghat and Chhindwara districts; rich in grit, phyllite, quartzite, green stones, and magniferous rocks.

Conclusion

These are India's oldest metamorphic rocks, formed between 2.5 billion and 1.8 billion years ago. They are generated as a result of the transformation of sediments derived from Archean rocks. Metallic minerals such as iron, manganese, gold, copper, and others abound. They are regarded to be metallic mineral stockpiles and hence have a high economic value.

GS Mains Questions and Model Answers

Q1: Discuss the geological and economic significance of the Dharwar System in India.

Answer: The Dharwar System is one of the oldest geological formations in India, dating back to the Archean period. Its rocks are predominantly metamorphic, and the system is rich in metallic minerals, including gold, iron ore, and manganese. The economic significance of the Dharwar System lies in its contribution to India’s mining industry, especially in regions like Karnataka. The Kolar and Hutti gold mines, along with iron ore extraction in the Bellary district, are prime examples of how this geological formation supports economic growth in mining and industrial sectors.

Q2: Evaluate the role of the Dharwar System in the development of India’s mineral-based industries.

Answer: The Dharwar System plays a crucial role in India’s mineral-based industries due to its rich deposits of gold, iron ore, manganese, and copper. The system supports mining activities in regions like Karnataka and Madhya Pradesh, providing raw materials for the steel, cement, and iron industries. The exploitation of these resources has fostered industrial growth in mining towns, contributing to the local economy and employment. However, sustainable mining practices must be adopted to mitigate environmental impacts and ensure long-term benefits.

Q3: Analyze the environmental challenges associated with mining activities in the Dharwar System regions.

Answer: Mining activities in the Dharwar System regions, such as the extraction of gold and iron ore, have contributed to significant environmental challenges. These include deforestation, soil erosion, and the depletion of groundwater resources. Mining operations also lead to air and water pollution, affecting the health of local communities. To address these challenges, strict regulations on sustainable mining practices and environmental conservation are needed. Restoration projects, afforestation, and the management of mining waste can mitigate some of the adverse effects of these activities.

Previous Year Questions on Dharwar System

1. UPSC CSE Prelims 2018:

Question: Which geological system is associated with the oldest rock formations in India?

A. Cuddapah System

B. Vindhyan System

C. Dharwar System

D. Gondwana System

Answer: C

Explanation: The Dharwar System is the oldest rock formation in India, dating back to the Archean era, and is known for its rich deposits of minerals like gold and iron ore.

2. UPSC CSE Mains 2017 (GS Paper 1):

Question: Analyze the economic importance of the Dharwar rock system in India’s mining industry.

Answer: The Dharwar rock system is economically significant due to its rich deposits of metallic minerals, including gold, iron ore, manganese, and copper. These minerals have made regions like Karnataka and the Aravallis major centers for mining activities. The gold mines of Kolar and Hutti are prime examples of how Dharwar rocks contribute to India's mining sector. The system also contains valuable non-metallic minerals, adding to the overall industrial and economic development of the region.

3. UPSC CSE Prelims 2017:

Question: Which type of minerals are predominantly found in the Dharwar rock system?

A. Non-metallic minerals

B. Fossil fuels

C. Metallic minerals

D. Precious stones

Answer: C

Explanation: The Dharwar System is rich in metallic minerals, especially gold, iron ore, manganese, and copper, making it vital for India’s mining industry.