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Home > Craton


 

A craton is an old and stable part of the continental crust that has survived the merging and splitting of continents and supercontinents for at least 500 million years. Cratons are generally found in the interiors of continents and are formed of a crust of lightweight felsic igneous rock such as granite attached to a section of the upper mantle. A craton may extend to depth of 200 km.

Cratons are subdivided geographically into provinces, each province being classified as an Archon, a Proton or a Tecton according to its age:

As minerals (such as precious metals and diamonds) in the Earth's crust tend to become separated with time, the oldest cratons are of the greatest interest to mining companies. Cratons are still being discovered as prospectors search the globe.

Named cratons, listed by continent, include:

Plate tectonics

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