Sunday, March 25

Oldest chunk of Earth's crust ever found

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Oldest chunk of Earth's crust ever found

The oldest substantial chunk of Earth's crust has been found in Greenland, and dates back at least 3.8 billion years. The find is important because it is of a type known as an ophiolite – a signature of plate tectonics – and provides the best evidence yet that plates have been moving across the Earth's surface for at least a billion years longer than thought.

A sheeted dike complex with sharp, well-defined chilled margins. These are signature traits of an ophiolite – a piece of oceanic crust embedded within a continent. In a sheeted dike complex, younger magma intrusions, or
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