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Most of the continental crust formed during the Archaean Eon. This period is also characterized by the significant changes in the composition of crust, mantle and atmosphere, advent of plate tectonics, appearance of the first life and formation of major mineral deposits. However, the actual mechanism(s) of formation of Archaean crust is poorly understood and remains a topic of major research interest globally. Understanding the generation and evolution of Archaean crust in Indian cratons can provide important insights into the following research issues
• How far we can trace back crust formation?
• What was the nature of the initial crust?
• How and where did Archaean crust formed?
• What was the nature of Archaean geodynamics?
• Configuration of the Archaean supercontinents & ancestry of the Indian cratons – their global significance.
This presentation talks about the recently acquired whole-rock geochemical, Nd-isotope and Zircon U-Pb age and Hf isotope data on rocks of the Dharwar and Singhbhum cratons to discuss the above-mentioned issues. |