Page 165 - Microtectonics

154 5 · Shear Zones
Fig. 5.45.
a Schematic presentation of a
flanking fold structure in folia-
tion or bedding (host element-
HE) around a vein or fault (cross-
cutting element-CE). The geom-
etry can be defined in terms of
lift and slip. Lift defines the
elevation of the far-field HE
above the cutoff point against
the CE; slip is displacement of
the HE along the CE. Both are
positive as shown in the inset
for a structure in the hanging
wall. b Simplified geometries of
flanking structures along CE
with different slip and lift.
(After Coelho et al. 2005)

Fig. 5.46.
Shear bands (a) and false shear
bands (b) have a different slip
sense, but this is only obvious if
displaced markers can be rec-
ognised. If multiple markers are
displaced (c and d), the distinc-
tion may not be visible