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Chapter 6: Strike-slip Basins This presentation contains illustrations from Allen and Allen (2005) . Strike-slip Basins. Geological and Geophysical Observations Basin Diversity Structural Features of the PDZ Uniform Extension and Pull-apart Basins.

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chapter 6 strike slip basins this presentation contains illustrations from allen and allen 2005
Chapter 6:

Strike-slip Basins

This presentation contains illustrations from Allen and Allen (2005)

slide2

Strike-slip Basins

Geological and Geophysical Observations

Basin Diversity

Structural Features of the PDZ

Uniform Extension and Pull-apart Basins

geological and geophysical observations basin diversity
Geological and Geophysical ObservationsBasin Diversity
  • Where are the maximum, minimum and intermediate principal stress directions?
geological and geophysical observations basin diversity7
Geological and Geophysical ObservationsBasin Diversity

Transform --- plate scale

Transcurrent --- crustal scale e.g. Garlock Fault CA

(USGS)

geological and geophysical observations basin diversity8
Geological and Geophysical ObservationsBasin Diversity
  • Extension or shortening can occur simultaneously along the same fault line, depending on the local relative angle between plate movement direction and fault orientation
  • Basins are usually narrow and can lose their heat very rapidly
slide23

Strike-slip Basins

Geological and Geophysical Observations

Basin Diversity

Structural Features of the PDZ

Uniform Extension and Pull-apart Basins

slide25

Left-lateral internal fault

Right-lateral confining major fault

extension

CW rotation

shortening

slide27

Experimental fault types along a pure strike slip margin

En echelon folds

Principal deformation zone

Riedel shears form at a small angle to the PDZ, & with same offset

strike slip pdz in cross section
Strike-slip PDZ in Cross-section
  • Flower-structures
  • Variable offsets along the same fault because of movement in and out of the plane of observation
slide33

Strike-slip Basins

Geological and Geophysical Observations

Basin Diversity

Structural Features of the PDZ

Uniform Extension and Pull-apart Basins

pitman and andrews 1985
Pitman and Andrews (1985)
  • Pull-apart basins experience very rapid subsidencein the early part of their history because of high heat loss across the nearby rift walls.