About 100 million years ago the breakup of a super continent centred over the South Pole initiated the northward drift of Africa, Australia and India (see Fig. 4.1). Of particular interest is India for its drift was terminated by a head-on collision with Asia. Such a collision between continental blocks is geologically rare. That between India and Asia is the only one in the last 200 million years. A continent-continent collision is quite different than that involving ocean crust and continental crust. In such cases the ocean crust is subducted intact into the mantle beneath the continent. Hence it...

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