Chapter 3

Question 1

Why perform strain analysis?

Answer 1

It can be important to retrieve information about strain from deformed rocks.

Question 2

are concerned with
changes in length and therefore the simplest form of
strain analysis we have.

Answer 2

One-dimensional strain analyses

Question 3

Objects revealing the state of strain in a
deformed rock are known as

Answer 3

Strain Markers

Question 4

The horizon may be stretched by normal faults or shortened by reverse
faults, and the overall strain is referred to

Answer 4

Brittle Strain

Question 5

we look for sections that have objects of known initial shape or contain linear markers with a variety of orientations

Answer 5

two-dimensional strain analyses

Question 6

This method dates back to 1962 and is a geometric construction for finding strain in two dimensions (in a section). It is typically demonstrated on fossils with
orthogonal lines of symmetry in the undeformed state.

Answer 6

The Wellman method

Question 7

We have already stated that the angular shear depends on the orientation of the principal strains: the closer the
deformed orthogonal lines are to the principal strains, the lower the angular shear.

Answer 7

The Breddin graph

Question 8

This method, here demonstrated in Figure
on the assumption that circular objects have a more or less statistically uniform distribution in our section(s).
This means that the distances between neighboring particle centers were fairly constant before deformation.

Answer 8

Center-to-center method

Question 9

Hans Breddin

Answer 9

Breddin Grpah 1956

Question 10

A quicker and visually more attractive method for finding two-dimensional strain was developed by Norman
Fry at the end of the 1970s.

Answer 10

Fry Method

Question 11

A complete strain analysis is

Answer 11

three dimensional strain analysis

Question 12

are presented in the Flinn
diagram or similar diagrams that describe the shape of the strain ellipsoid,

Answer 12

strain geometry

Question 13

where the overall strain is distributed unevenly in terms of intensity and/or geometry in a rock volume.

Answer 13

strain partitioning

Question 14

Strain markers with the same mechanical properties as the surroundings

Answer 14

passive strain markers

Question 15

Those that have anomalous mechanical properties respond differently than the surrounding medium to the
overall deformation

Answer 15

active strain markers

Question 16

only revealed by means of new deformation structures (cleavage, shear zones, fractures) or by means
of preexisting markers that have changed shape during deformation

Answer 16

strain