Question

________ is a model in which an initially high-angled fault is progressively rotated to lower dips by isostatic uplift.

A) Reverse Fault Model
B) Normal Fault Model
C) Thrust Fault Model
D) Detachment Fault Model

Answer 1

A thrust fault model is a model in which an initially high-angled fault is progressively rotated to lower dips by isostatic uplift. It is a low-angle reverse fault that is formed by compressional stress. This model is commonly observed in mountain belts formed by tectonic collision.

Step-by-step explanation:

A thrust fault model is a model in which an initially high-angled fault is progressively rotated to lower dips by isostatic uplift. Thrust faults are low-angle reverse faults that are formed by compressional stress. They are more common than reverse faults and are characterized by the movement of the allochthonous block over the autochthonous block. This model is commonly observed in mountain belts formed by tectonic collision.

For example, the Copper Creek Thrust Fault in Tennessee is a prominent example of a thrust fault. It is a low-angle reverse fault formed by compressional stress in the Appalachian Mountains. The folded rocks above the fault are part of the Rome Formation (Middle Cambrian), while the tilted rocks below the fault are Moccasin Formation limestones (Middle Ordovician).