Any fabric element that can be represented by a line, meaning that
one of its dimensions is much longer than the other two.
Lineations
It occurs as any repeated, commonly penetrative and parallel alignment of linear elements within a rock.
Lineation
T or F
Lineations may be a primary igneous or sedimentary fabric element.
True
Lineations due to ____________ ______________ lay on foliation planes and are, therefore, as penetrative as foliations.
Ductile Deformation
T or F
A single deformation cannot produce several sets of lineations with varying orientations within a given foliation plane.
F, it can produce such structures.
_____________ are rock surfaces
naturally polished by motion on
faults.
Slickensides
Slickensides often display _____________ __________, which are
linear structures due to frictional
sliding on the fault surfaces.
Slickenside Striae
Slickenside Striae are also called as?
Slickenlines
Slickensides can be an inidcator of the direction of a ________ __________ _________.
Fault Slip Vector
A slickenside is under what type of Lineation?
Non-penetrative Lineation
Planar structures often intersect, and the line of intersection is regarded as an ____________ _____________.
Intersection Lineation
T or F
Intersection lineations appearing on bedding or foliation are surfaces that are intersected by a later foliation.
T
In most cases, intersection lineations are related to ____________, with the lineation running parallel to the axial trace and the hinge line.
Folding
Small scale rippling of an earlier foliation (and occasionally bedding) produces an obvious linear array parallel to the closely spaced and regular wrinkle hinges.
Crenulation Lineation
The crenulation lineation is the
fabric element ___________ to the
tightly spaced hinges.
Parallel
Crenulation Lineations are generally a good indication of _____________ ______________.
Superposed Deformation
Cylindrical structures
developed at the interface
between rocks of different
competence shortened
along the layering.
Mullions or Boudinage
Form lineations at the
interface between rocks of
significantly different
competence (viscosity).
Mullions
Elongate, cylindrical and monomineralic bodies of segregated mineral
(quartz, calcite, pyrite, etc.) in metamorphic rocks of all grades.
Rods
T or F
Rod lineations May have any profile outline, from elliptical to irregular, dismembered rounded structures.
T
Rod Lineations are generally ____________ to local fold axes and often are isolated fold hinges detached from their limbs.
Parallel
Three kinds of Lineations under Axes of folds as Lineations
Crenulation Lineation, Mullions, and Rods
The parallel alignment of
individual grains, aggregates or
fragments of any size that have
been elongated and/or rotated
during deformation is an
important type of lineation.
Stretching lineations
For example, ellipsoidal ooids
and spherulites must have been
deformed since they generally
are originally almost spherical
and their long axes define the __________ ___________.
Stretching Lineation
