Archean rocks are some of the oldest rocks found in India, dating back to the Archean Eon (3.8-2.5 billion years ago). These rocks are primarily found in the following regions: 1. Dharwar Craton (Karnataka): One of the oldest and largest Archean crustal blocks in India. 2. Bastar Craton (Chhattisgarh): Known for its rich iron ore deposits and ancient Archean rocks. 3. Singhbhum Craton (Jharkhand and Odisha): Home to some of the oldest rocks in India, including the Singhbhum Granite. 4. Aravalli Range (Rajasthan): Although largely Proterozoic, the Aravalli Range has some Archean rocks in its southern parts. 5. Eastern Ghats (Odisha and Andhra Pradesh): This region has scattered Archean rock formations, including the ancient Vishakhapatnam Granite. 6. Western Ghats (Kerala and Tamil Nadu): Archean rocks are found in the southern parts of the Western Ghats, particularly in the Nilgiri Hills. 7. Bundelkhand Craton (Uttar Pradesh and Madhya Pradesh): This region has some of the oldest rocks in India, including Archean granites and gneisses.
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Archean rocks are still available in the following Indian states- Andhra Pradesh, Karnataka,Tamil Nadu,Madhya Pradesh, Odisha,Chotanagpur plateau of Jarkhand and South eastern parts of Rajasthan
Felsic rocks are light-colored, silica-rich igneous rocks. They form from magma that is high in silica and feldspar. Eg. - granite, rhyolite, and obsidian.
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