Chapter 10 11-2-06

Chapter 10 11-2-06 - 3/30/2008 Chapter 10 Crustal...

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5/7/2009 Chapter 10 – Crustal Deformation Mapping Geologic Structures -Mapping orientation or attitude of a rock layer / fault surface: determine features -Strike (trend) -Compass direction of line produced by intersection of inclined rock layer or fault with a horizontal plane. -Generally expressed as an angle relative to north. - Strike and Dip are always perpendicular Folds -During crustal deformation rocks are often bent into a series of wave-like undulations. -Characteristics of folds -Most result from compressional stresses shortening and thickening the crust -Parts of a fold -Limbs – refers to the two sides of a fold -Axis – a line drawn down the points of maximum curvature of each layer -Axial plane – an imaginary surface that divides a fold symmetrically *Plunging folds -Common types of folds -Anticline *Plunge towards the nose -Syncline *Plunge away from the nose -Depending on their orientation, they can be described as *Incumbent folds have a horizontal axial plane -Symmetrical, asymmetrical, recumbent (overturned fold),
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This note was uploaded on 03/30/2008 for the course GEOL 101 taught by Professor Olinsky during the Spring '08 term at Texas A&M.

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Chapter 10 11-2-06 - 3/30/2008 Chapter 10 Crustal...

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