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Homogeneous Strain - Structural Geology - Lecture Slides, Slides of Geology

Alagappa UniversityGeology

In these lecture slides, following are the main points that have been discussed : Homogeneous Strain, Linear Function, Reference Point, Domain, Originally Straight, Affine Deformation, Strain Parallel, Homogeneous, Squares, Parallelograms

Typology: Slides

2012/2013

Uploaded on 07/22/2013

sangeeta
sangeeta 🇮🇳

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Homogeneous Strain
•Positions of points with respect to some
reference point in a strained domain are a
linear function of their position with respect
to the same reference point before strain
•The directions of the lines may change
•In other words, in homogeneous
deformation, originally straight lines remain
straight after deformation
–also called affine deformation
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Homogeneous Strain

  • Positions of points with respect to some reference point in a strained domain are a linear function of their position with respect to the same reference point before strain
  • The directions of the lines may change
  • In other words, in homogeneous deformation, originally straight lines remain straight after deformation - also called affine deformation

Homogeneous Strain

  • Homogeneous strain affects non-rigid rock bodies in a regular, uniform manner
  • During homogeneous strain parallel lines before strain remain parallel after strain, as a result cubes or squares are distorted into prisms and parallelograms respectively, while spheres and circles are transformed into ellipsoids and ellipses respectively
  • For these generalizations to hold true, the strain must be systematic and uniform across the body that has been deformed

Homogeneous Strain

Homogeneous Deformation - Pure Shear

Inhomogeneous Strain

  • Heterogeneous strain affects non-rigid bodies in an irregular, non-uniform manner and is sometimes referred to as non-homogeneous or inhomogeneous strain
  • During heterogeneous strain, parallel lines before strain are not parallel after strain
  • Circles and squares or their three-dimensional counter parts, cubes and spheres, are distorted into complex forms

Heterogeneous or Inhomogeneous strain

  • Leads to distorted complex forms