Friday, October 19, 2007

India @20 cm/year

Ann sent link of an interesting article on mail . It explains the reason of India's landmass speration from a land named Gondwanaland which existed in South Pole region some 130 million years back.
The story of India’s high-speed journey began more than 100 million years ago on another continent, called Gondwanaland. This continent, which lay near the present-day South Pole, was a large landmass composed of what are now Africa, Australia, Antarctica and India.But around 130 million years ago, Gondwanaland began to drift apart. That may have been because it was being heated from below by a giant volcanic plume, says Rainer Kind, a geologist at the Free University in Berlin. Whatever the cause, it sent different parts travelling off at different speeds in different directions, he says.

Antarctica remained more or less stationary, while Australia and Africa drifted slightly farther afield. But India took off for the north at an incredible speed of 20 centimetres a year, Kind says. That might seem relatively slow, but for a landmass it’s an impressive clip. In fact, Kind says, "this is the fastest speed of a continent ever detected".

The results help settle a debate about how lithospheric thickness influences a continent’s motion.

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