Give Brief information on 'Block Mountains'
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Definition of Block Mountains:
Block Mountains id defined as the result of faulting caused by tensile and compressive forces motored by endogenetic forces coming from within the earth, also known as fault block mountains. Block mountains represent the upstanding parts of the ground between two faults or on either side of a rift valley or a graben.
Types of Block Mountains:Definition of Block Mountains:
Block Mountains id defined as the result of faulting caused by tensile and compressive forces motored by endogenetic forces coming from within the earth, also known as fault block mountains. Block mountains represent the upstanding parts of the ground between two faults or on either side of a rift valley or a graben.
Types of Block Mountains:
Essentially, block mountains are formed due to faulting in the ground surface. Block mountains are generally of two basic types e.g.:
(i) Tilted block mountains having one steep side represented by fault scarp and one gentle side and
(ii) Lifted block mountains represent real horst and are characterized by flattened summit of tabular shape and very steep side slopes represented by two boundary fault scarps, Block mountains are also called as horst mountains.
Block mountains are found in all the continents e.g.:
(i) Young block mountains around Albert, Warner and Klamath lakes in the Steens Mountain District of Southern Oregon, Wasatch Range in the Utah province etc., in the USA,
(ii) Vosges and Black Forest mountains bordering the faulted Rhine Rift valley in Europe and
(iii) Salt Range of Pakistan etc. Sierra Navada mountain of California (USA) is considered to be the most extensive block mountain of the world.
This mountain extends for a length of 640 km (400 miles) having a width of 80 km (50 miles) and the height of 2,400 to 3,600 m (8,000 to 12,000 feet). There is difference of opinions among the scientists regarding the origin of block mountains.