Geological Structures and Fault Mechanics: Thrust Faults, Folds, and Deformation Processes

Thrust faults place younger rocks over older ones

false

metamorphic core complexes are related to thrusts

False

Slip on decollements is conister with byerlee andersonian fault mechanics

false

thrusts end abruptly with sharp slip gradients

false

klippe's represent isolated pieces of the hanging wall for thrusts

true

the hangingwall of a thruft folds at activw axial surfaces

true

thrusts conserve slip when fault propagation folds form

false

fault bend folds form as the hangingwall of a thrust fault moves over bends in the fault

true

synclines generally form in the hanginwalls of fault propagation folds

false

the hanging wall flat is parralel to the fault

true

An anticline has the youngest rocks in its core

false

a recumbest fold has a horizontal axial plane

true

thrust belts have a mechanically favourable shape called a critical taper

true

buckling folds form due to in plane shortening

true

parallel folds have variable layer thickness

false

granular flow occurs at depths of 1km

false

pressure solution is also called cobble creep

False

the shape of a fold depends on its mechanical properties

true

folds commonly develop cleavages parallel to their axial plane

true

in refolded folds the oldest fold generation has a straight fold axis

false

buckling folds form due to in plane shortening

true

bending folds form due to in plane shortening

false

tectonites form due to deformation

true

cleavages are spaced foliations

true

axial planar cleavage generally leads to volume decrease

true

crenulations commonly form in quartz rich materials

false

pencil cleavage forms by the intersection of 2 cleavages

true

ideal plastic shear zones are formed by pure shear

false

mylonite foliations quickly become parallel to the shear zone boundaries

true

porphyroclasts are minerals that grow in a shear zone

false

stretching lineations always form in the elongation direction of strain

true

lineations should always be observed and measured on foliation planes

false