Stress, Folding and Faulting

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Presentation transcript:

Stress, Folding and Faulting 2/27/2019

Rock Reaction When Stressed “Stress and Strain” Warm Rocks are Pliable (Ductile Deformation) so they tend to bend and fold. Cool Rocks are Brittle so they tend to fracture (no relative movement) and fault (movement from existing rock).

Compression = Heat = Rocks Tend to Fold

Folded Rocks syncline anticline Where are the oldest rocks exposed at the surface? anticline

anticlines

Anticline

synclines

Syncline

Folded Rocks monocline rock has a gently dipping bend in the horizontal rock layer. monocline

Strike-Slip Fault

Strike-slip (Transform) Fault

Strike-Slip Fault

Strike Slip Fault

Normal Fault

Normal Fault

2 4 6

Reverse Fault

Graben Fault (Rift Valley) Formed from two normal faults.

Graben Fault

Formed from two reverse faults. Horst Fault Formed from two reverse faults.

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