Which one of the following geosynclines is the oldest?

The correct answer is Dharwar geosyncline.

Key Points

• The Dharwar geosyncline is the oldest known geosyncline in India.
• It is associated with the Dharwar system of rocks, which are the oldest rock systems in India.
• The rocks of the Dharwar geosyncline are primarily of Archean age, dating back more than 2.5 billion years.
• The Dharwar rocks are known for their rich mineral deposits, including gold, iron, and manganese.

Important Points

• Geosynclines are large-scale depressions in the Earth's crust that serve as sites for sediment accumulation and eventual mountain-building processes.
• The Dharwar geosyncline played a significant role in the geological history of India, contributing to the formation of the Indian shield.
• It is a classic example of an ancient geosynclinal system that has undergone significant tectonic activity and metamorphism.

Additional Information

• Delhi geosyncline: The Delhi geosyncline is a Proterozoic-aged geosyncline that developed in northwestern India. It is associated with the formation of the Aravalli ranges and consists of the Delhi Supergroup of rocks, which includes quartzite, marble, and schist.
• Eastern Ghat geosyncline: This geosyncline is located along the Eastern Ghats region of India and is composed of rocks primarily of Precambrian age. The Eastern Ghats are known for their granulite facies rocks and metamorphism.
• Satpura geosyncline: The Satpura geosyncline is associated with the formation of the Satpura ranges. It contains sedimentary and metamorphic rocks of Proterozoic age and is an important geological feature of central India.