Structural Geology L02

Question 1

What is homogenous deformation?

Answer 1

Homogenous defo. : All point within deforming body undergo same change in shape and volume. (Originally straight and parallel lines remain straight even after defo.)

Question 2

What is heterogeneous deformation?

Answer 2

Changes in size and shape across deformed body - strain and volume will be constant.

Question 3

Define deformation.

Answer 3

Change in form or shape - rigid body & non-rigid body

Question 4

Differentiate rigid-body deformation and non rigid- body deformation

Answer 4

Rigid-body defo. : Translation & Rotation

Non rigid-body defo. : Strain & volume change

Question 5

what is material line?

Answer 5

Lines that contain recognizable features, e.g.
grains, fossil, crystals, mineral alignment

Question 6

Draw each stages in deformation.

Answer 6

Refer slide no. 9

Question 7

compare and contrast brittle deformation and ductile deformation.

Answer 7

Brittle deformation
* Rigid lithologies e.g.
crystallized rock,
igneous rocks
* Tend to fracture
* Simple shear process
* Lower temperature -
lithologies e.g. rocks on
earth surface

Ductile deformation
* Softer lithologies, e.g.
fine-grained rocks,
sedimentary rocks
* Tend to fold, rather than
fracture
* Pure shear process
* High temperature -
lithologies, e.g. deeper
part of earth
* Long period of applied
force

Question 8

what is the factors of deformation?

Answer 8

Temperature, Confining Pressure, Strain Rate, Composition.

Question 9

Draw Brittle-Ductile Properties of the Lithosphere

Answer 9

Refer slide no. 12