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Craton

from Asthenosphere by Lethave Plank

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about

A craton ( /ˈkreɪtɒn/, /ˈkrætɒn/, or /ˈkreɪtən/; from Greek: κράτος kratos "strength") is an old and stable part of the continental lithosphere, which consists of Earth's two topmost layers, the crust and the uppermost mantle.

Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates; the exceptions occur where geologically recent rifting events have separated cratons and created passive margins along their edges.

They are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedimentary rock. They have a thick crust and deep lithospheric roots that extend as much as several hundred kilometres into Earth's mantle.

The term craton is used to distinguish the stable portion of the continental crust from regions that are more geologically active and unstable. Cratons can be described as shields, in which the basement rock crops out at the surface, and platforms, in which the basement is overlaid by sediments and sedimentary rock.

The word craton was first proposed by the Austrian geologist Leopold Kober in 1921 as Kratogen, referring to stable continental platforms, and orogen as a term for mountain or orogenic belts. Later Hans Stille shortened the former term to Kraton from which craton derives.

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from Asthenosphere, released April 14, 2020

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Lethave Plank Valencia, Spain

🎼Spacemusic composer and synth programmer🎹

🚀Booking and management: lighttrailsrecords@gmail.com🛰

📬E-Mail: lethaveplank@gmail.com📯

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