This document provides an overview of structural geology. It defines structural geology as the study of the three-dimensional distribution and deformation of rock bodies. Deformation occurs due to stresses, the mechanical properties of rocks, time, and depth. There are two main types of structures: rupture structures like fractures, joints, faults, and shears that form from brittle deformation, and plastic structures like folds and foliations that form from ductile deformation. Key terms used to describe geological structures like strike, dip, and outcrops are also defined.
The current ppt discusses the different types of lineations formed due to deformation.
Lineations are genetically related to the foliation planes on which they occur, particularly where both are shaped by mineral orientations. Therefore, the planar and linear fabrics are both together aspects of the same three-dimensional geometry, which is related to the shape of the finite strain ellipsoid or,
more important still, to the history of incremental strains.
The current ppt discusses the different types of lineations formed due to deformation.
Lineations are genetically related to the foliation planes on which they occur, particularly where both are shaped by mineral orientations. Therefore, the planar and linear fabrics are both together aspects of the same three-dimensional geometry, which is related to the shape of the finite strain ellipsoid or,
more important still, to the history of incremental strains.
Structural geology is the study of the three-dimensional of the rock units with respect to their deformational histories, Structure is spatial and geometrical configuration of rock components.
Structures are classified into two types:
Primary structures.
Secondary structures
Primary structures
Structures that form during deposition or crystallization of the rock, are the result of two processes:
Settling of solid particles from fluid medium in which they have been suspended, in most of the sedimentary rocks.
Crystallization of mineral grains from a liquid in which they have been dissolved as in igneous rocks.
Structural geology is the study of the three-dimensional of the rock units with respect to their deformational histories, Structure is spatial and geometrical configuration of rock components.
Structures are classified into two types:
Primary structures.
Secondary structures
Primary structures
Structures that form during deposition or crystallization of the rock, are the result of two processes:
Settling of solid particles from fluid medium in which they have been suspended, in most of the sedimentary rocks.
Crystallization of mineral grains from a liquid in which they have been dissolved as in igneous rocks.
What is Rock
A rock is a naturally occurring solid. It is made of minerals (which are crystalline), or other mineral-like substances. The Earth's outer solid layer, the lithosphere, is made of rock. That means the Earth's crust is made of rock.
Mechanical Behavior Of rocks
Elasticity of Rock
Specific gravity
stress
Strain
Permeability
Porosity
Strength
Impotant Mechanical properties of rock like stress, strain, specific gravity, Elasticity of rock , porosity , streangth of stone are explain and different types of rock are used in contruction buildings , roads and used in other construction works explain as well
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2. SRUCTURAL GEOLOGY
Structural geology is the study of the three
dimensional distribution of large bodies of
rock, their surfaces, and their composition.
We try to learn about their tectonic history,
past geological environments and event that
could have changed or deformed them.
3. DEFORMATION
In earth science, deformation means
alternation of size or shape of rock.
Deformation is caused by,
1. Deformative forces
2.Mechanical properties of Rock
3.Time period
4.Depth of formation
4. 1 DEFORMATIVE FORCES
“The shape and size of a rock material change due
to the action of STRESS.”
What is a Stress?
Stress is the force acting on unit area of a material
surface.
5. There are three types of STRESS
COMPRESIV
E STRESS
It is a force that pushes
the material on opposite
sides of a plane.
TENSILE
STRESS
It is a force that pull apart
the material on opposite
sides of a plane
SHEARING
STRESS
It is a force that causes
layers or parts to slide
upon each other in
opposite directions
6. “When rocks deform they are said to STRAIN”
What is a Strain?
A strain is a change in size, shape, or volume of a
material.
7. 2 MECHANICAL PROPERTIES
OF ROCK
This speaks about the strength of the rocks.
1. BRITTLE - hard but liable to break easily.
2. PLASTIC(Malleable) - permanent deformation under
stress.
3. ELASTIC - able to resume its normal
shape spontaneously after
deformation.
8. A Rock subjected to increasing stress it passes
through 3 successive stages of deformation.
ELASTIC
DEFORMATION
Strain is reversible
DUCTILE (PLASTIC)
DEFORMATION
Strain is reversible
Rearrangement of platy or
flaky minerals (if present)
BRITTLE
DEFORMATION
Irreversible strain where the
material breaks.
9. 3 TIME
•A Small force acting over a great length of time
can bring about the same type of structure like
that produced by a large force acting over a short
period of time.
•Forces that are unable to deform rocks may
cause rock to flow, if it is maintained for a long
period of time.
10. 4 DEPTH OF FORMATION
•A Rock situated in the shallow depth and
greater depth behave differently.
•Physical properties like Temperature, Litho
static pressure differ with respect to depth.
•The factor of Depth is called by the term
“Environment of Structural deformation”
11. From above details Structures seen in Earth is
of two types
STRUCTURES
RUPTURE
STRUCTURES
PLASTIC
STRUCTURES
12. RUPTURE STRUCTURES
FRACTURE
A Fracture is any separation in a
geologic formation
JOINT
A Joint is a fracture dividing rock
into two sections that have not
moved away from each other.
13. FAULT
Planar fracture or discontinuity
in a volume of rock, across
which there has been
displacement of rock-mass .
SHEAR
Response of a rock to deformation
usually by compressive stress and
forms particular textures.
14. PLASTIC STRUCTURES
FOLDS
One or a stack of originally flat
and planar surfaces are bent
or curved as a result of
permanent deformation
FOLIATION
Repetitive layering in
metamorphic rocks
LINEATION
Linear structural features within
rocks
15. MEASUREMENT OF GEOLOGIC
STRUCTURES
•All geologic structures are mathematical models
we designed for studying.
•To convert these real life figures to mathematical
data we need to be aware of certain terms.
17. 2. STRIKE & SLIP
STRIKE - Direction in which a geological structure is
present.
*STRIKE DIRECTION may be defined as direction of trace of
Intersection between horizontal plane and the bedding plane
*Usually Clinometer compass or Brunton compass are used
to measure STRIKE.
18.
19. DIP - It means SLOPE or INCLINATION.
Expressed both as amount and direction.
*Dip direction- Direction along which inclination of bedding plane
occurs.
*Dip amount - Angle at which a planar feature is inclined to the
horizontal plane
20. STRIKE direction will always be
perpendicular to DIP direction.
Apparent dip is the name of any dip
measured in a vertical plane that is not
perpendicular to the strike line