11.2 – Types of Mountains

Do Now List the major types of mountains.

Do Now List the major types of mountains. Folded Fault-Block

Key Words Dominant Uplifted

Vocab Words Fault-Block Mountain Folded Mountain Graben Horst Orogenesis

Mountains Mountains are classified by the dominant processes that have formed them. Orogenesis is the collection of processes that result in the forming of mountains. Two types of mountains: Folded Fault-Block

Folded Mountains These are mountains that are formed primarily by folding. Compressional stresses are the major force that forms folded mountains.

Fault-Block Mountains These are formed as large blocks of crust are uplifted and tilted along normal faults.

Fault-Block Mountains Graben - are formed by the downward displacement of fault-bounded blocks, when the crust drops down. Horst - are elongated, uplifted blocks of crust bounded by faults, when the crust is pushed up.

Fault-Block Mountains

Domes and Basins When upwarping produces a circular or elongated structure, the feature is called a dome. Uplifted mountains are circular or elongated structures formed by uplifting of the underlying basement rock.

Domes and Basins

Group Challenge Question In a mountain range, you observe a series of anticlines and synclines and numerous thrust faults. How would you classify the type of mountains in this mountain range?