Foliations Flashcards

1
Q

Origin of gneissic layering

A
  1. Inheritance of compositional contrast from the protolith
  2. ## Transposition
  3. Differentiation
    -generation of new layering during deformation/metamorphism
    -higher pressure in zones of shearing
    -solubility of certain materials increases
    -shearing happens oblique or perpendicular to original orientation
  4. Lit-par-lit (layer-by-layer) intrusion of sills
    -layers intruded
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2
Q

transposition

A

What is it?
Rotation of a pre-existing foliation (e.g., bedding) by folding into an orientation approximately parallel to the axial plane of the folds
 development of a new orientation of bedding in such a way that bedding, as seen in small outcrops, no longer provides information concerning stratigraphy or gross distribution of
stratigraphic horizons.

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