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GEOL 101 Folding: Lecture 12

by: Natalee Stanton

GEOL 101 Folding: Lecture 12 101-017

Marketplace > University of South Carolina > Geology > 101-017 > GEOL 101 Folding Lecture 12
Natalee Stanton
Geology 101-017

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These notes will cover the Power Point, Professors lecture, and the answers to the Sample Exam Questions
Geology 101-017
Class Notes
Geology 101
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This 0 page Class Notes was uploaded by Natalee Stanton on Friday February 12, 2016. The Class Notes belongs to 101-017 at University of South Carolina taught by in Winter 2016. Since its upload, it has received 30 views. For similar materials see Geology 101-017 in Geology at University of South Carolina.


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Date Created: 02/12/16
GEOL 101 Rock Deformation Folding Types of Deformation 0 Elastic temporary change in shape or size of a body that is recovered when the stress is removed 0 Ductile plastic permanent change in shape or size of a body hat is not recovered when the stress is removed 0 Brittle Rupture the body undergoes little change under the stress until it breaks suddenly earthquakes Ductile Deformation three types of permanent deforming forces 1 Folding Can occur at a wide variety of scales and form microscopic to mountainscale Classified as either anticlines or synclines depending on the geometry of the fold It is described by geometry of the fold axis and axial plane Two parts of a fold a Hinges the curved parts of the folded layers b Limbs the straight parts of the folded layers 2 Stretching 3 Shearing Fold Axis 392 Line connecting all of the points of maximum curvature on a folded surface 0 May be a horizontal line a vertical line or anything in betweenplunging 0 May be a straight lie for a simple folds or a curved line or complex folds I Refer to compass orientation trend and deviation of horizontal plunge Axial Plane 393 A plan in a 3dimensional space containing the fold axes of folded layers 0 Plan can be vertical horizontal or anything in between dipping I Think of a plane of symmetry which separates two halves of a fold 0 Anticline Layers are folded such that they are concave downward convex upward 0 They form the shape of an A 39339 Older layers are in the middle of the fold and younger layers are on the outside of the fold 0 Syncline Layers are folded such that they are concave upward convex downward 0 They form the shape of cowl or trough 393 Younger layers are in the middle of the fold and older layers are on the outside of the fold Sample Exam Questions Strains are the forces that act on geologic materials and stresses are the deformation they produce a True Reverse faults form in response to forces b Shearing c Tensional d Torsional The compass direction of a horizontal line in a 3dimensional plane is called the a Dip c Nadir d Line of Horizontality In an anticline b the youngest rocks occur in the center and the limbs dip toward the center c the youngest rocks occur in the center and the limbs dip away from the center 1 the oldest rocks occur in the center of the limbs dip toward the center THIS IS AN EXAM QUESTION


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