DEFINITION OF FAULT-BLOCK MOUNTAINS

Fault-block mountains are generally formed by extension of

the continental crust. The best examples include the Basin and

Range Province of the western United States, and parts of the

East African rift system, including the Ethiopian Afar. These

mountain belts are formed by the extension or pulling apart

of the continental crust, forming basins between individual

tilted fault-block mountains. These types of ranges are associated

with thinning of the continental crust, and some have

active volcanism as well as active extensional deformation.

See also OROGENY; STRUCTURAL GEOLOGY.

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