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craton
(redirected from Cratons)

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia 0.07 sec.

craton

The relatively stable core of a continent that is not currently affected by tectonics along plate boundaries. Cratons generally consist of highly deformed metamorphic rock that formed during ancient orogenic explosions.

Cratons exist in the hearts of all the continents, a typical example being the Canadian Shield.



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Numerous questions remain, but these less familiar, non-uniformitarian processes explain in part why Archean cratons do not look like modern continental plates, even though many of the second-order processes were similar (e.
Under cratons, however, such zones either did not exist or lay much deeper; the mantle directly under cratons was colder and had a high seismic velocity to depths greater than 200 km.
Archean cratons are the primary host of economic diamond deposits worldwide and Superior, the world's largest craton, has demonstrated its potential for hosting economic diamond deposits through the development of De Beers Canada's Victor Project, where commercial diamond production is anticipated in 2008.
 
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