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Ch. 10; Crustal Deformation
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Are flat lying sedimentary and volcanic rocks are often bent into a series of wave like undulations. Two most common folds are anticlines and syncline. Anticline is formed by upfolding or rock layers and syncline is the limb on the anticline.
Force and stress
Stress is the amount of porce applied on a single area, types of stress
- differential stress: is unequally applied in different directions
- tensional stress: it tends to elongate or pull appart a rock
an irreversible change in the shape and size of a rock body when stress is caused.
temperature and confining
brittle failure or deformation is when a rock close to the surface where there are low presures and temperatures fracture after exceeding their strength.
Joints are fractures along which no appreciable displacement has occured
- two types of joints, columnar rorm wheningneous rocks cool and develop shrinkage
- most joints are produced when rocks in the outermost crust are deformed many rocks are roken by two or three sets of intersecting joints.
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