Folds are bends or curvatures that develop in rocks due to stresses. They can take many shapes depending on factors like force magnitude and direction. Folds develop slowly over geological time as rocks adjust to changing stress fields. They are classified based on whether the strata bend up (anticlines) or down (synclines). Additional classifications consider the position of the axial plane and relative dipping of the limbs. Complex fold types include overturned, recumbent, and box folds. Folds form over a range of scales from small individual structures to large regional folding.
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.
What are folds?
•Parts of the folds
•Classification of folds
•Classification on the basis of axial planes
•Classification on the basis of curvature(by Ramsay)
•Classification on the basis of plunge
•Engineering considerations
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.
What are folds?
•Parts of the folds
•Classification of folds
•Classification on the basis of axial planes
•Classification on the basis of curvature(by Ramsay)
•Classification on the basis of plunge
•Engineering considerations
This lecture includes the fold terminology and classification of folds based of different criteria.
Classification of folds based on:
Direction of closing
Attitude of axial surface
Size of interlimb angle
Profile
Ramsay Classification of folds
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
2. FOLDS
• Definition
• FOLDS may be defined as undulations or
bends or curvatures developed in the rocks of
the crust as a result of stresses to which these
rocks have been subjected from time to time in
the past history of the Earth.
3. Development of folds
• The folds may develop in any type of rock and
may be of any shape and geometry ranging
from simple up arched bends or downward
curvatures to completely overturned flexures.
• The ultimate shape and extent of a fold
depends upon a number of factors like the
nature, magnitude and the direction of and
duration for which these forces act upon the
rocks and also the nature of the rocks being
effected.
4. • The process of development of folds in the
rocks is called Folding.
• It is a very slow geological process and
indicates an effort of the rocks in a particular
environment to adjust themselves to the
changing force fields operating on, within or
around them.
• Folding is a ductile type of deformation
experienced by the rocks compared to the
brittle deformation where the rocks actually
get broken and displaced when stressed.
5. PARTS OF A FOLD
• Limbs
• These are the sides or flanks of a fold. An
individual fold will have a minimum of two
limbs but when the folds occur in groups, as
they very often do, a middle limb will be
common to two adjacent folds.
6.
7. • Hinge
• In a folded layer, a point can be found where
curvature is maximum and one limb ends and the
other limb starts from that point. This is the hinge
point.
• When rocks occur in a sequence and their all
hinge points are joined together, they make a line,
called the hinge line.
• Axial surface
• When the hinge line is traced throughout the
depth of a folded sequence a surface is obtained
which may be planar or non-planar. It is referred
to as axial surface
8. • Axial plane
• Axial plane is the imaginary plane that passes
through all the points of maximum curvature
inclined or horizontal in nature.
• A fold surface is planar in nature; otherwise it
in a folded sequence.
• It may be vertical, is sometimes called a planar
fold if the axial is a non-planar fold.
9. • Axis of a fold
• It is simply defined as a line drawn parallel to
the hinge line of a fold.
• A more precise definition of an axis of a fold
would be the line representing the intersection
of the axial plane of a fold with any bed of the
fold.
• Plunge of a fold
• The angle of inclination of the fold axis with
the horizontal as measured in a vertical plane
is termed the plunge of the fold.
10. • Crest and Trough
• Most folds are variations of two general forms;
up arched and down arched bends.
• The line running through the highest points in
an up arched fold defines its crest.
• A corresponding line running through the
lowest point in a down arched fold makes its
trough. The crest and trough may or may not
coincide with the axis of the fold.
11. CLASSIFICATION OF FOLDS
• Anticlines are defined as those folds in
which the strata are up arched, that is, these
become CONVEX UPWARDS; the
geologically older rocks occupy a position in
the interior of the fold, oldest being positioned
at the core of the fold and the youngest
forming the outermost flank, the limbs dip
away from each other at the crest in the
simplest cases.
12.
13. • Synclines
• The strata are down arched, that is, these
become CONVEX DOWNWARDS; the
geologically younger rocks occupy a position
in the core of the fold and the older rocks form
the outer flanks, provided the normal order of
superposition is not disturbed, in the simplest
cases in synclines, the limbs dip towards a
common center.
14. • Position of Axial Plane
• Depending upon the nature and direction of the
stresses the axial plane in a resulting fold may
acquire any position in space, that is, it may be
vertical, inclined or even horizontal.
• Following main types are recognized on the
basis of position of the axial plane in the
resulting fold:
15. • Symmetrical Folds
• These are also called normal or upright folds.
In such a fold, the axial plane is essentially
vertical.
• The limbs are equal in length and dip equally
in opposite directions.
• It may be an anticline or syncline and when
classified, may be described as symmetrical
anticline/ syncline as the case may be.
16.
17. • Asymmetrical Folds
• All those folds, anticlines or synclines, in
which the limbs are unequal in length and
these dip unequally on ether side from the
hinge line are termed as asymmetrical folds.
18. • Overturned folds
• These are folds with inclined axial planes in
which both the limbs are dipping essentially in the
same general direction.
• The amount of dip of the two limbs may or may
not be the same.
• Over folding indicates very severe degree of
folding.
• One of the two limbs (the reversed limb) comes to
occupy the present position after having suffered
a rotation through more than 90 degrees.
• The other limb is known as the normal limb.
19.
20. • Ø In certain cases, both the limbs of a fold may
get overturned because of very high lateral
compression.
• Ø It may be originally either an anticline or a
syncline but the extreme compression from
opposite sides results in bringing the limbs so
close to each other that the usual dip conditions
may get reversed —anticlinal limbs dip towards
each other and the synclinal limbs dip away from
each other.
• Ø Such a type of fold is commonly referred to as
a fan fold
• Ø In such folds, the anticlinal tops are said to
have opened up into a broad, fanshaped outline
due to intense compression in the lower region.
21. • Isoclinal Folds
• These are group of folds in which all the axial
planes are essentially parallel, meaningt,hat all
the component limbs are dipping at equal
amounts.
• They may be made up of series of anticlines
and synclines
22.
23. • Recumbent Folds
• Ø These may be described as extreme types of
overturned folds in which the axial plane
acquires an almost horizontal attitude.
• Ø In such folds, one limb comes to lie exactly
under the other limb so that a drill hole dug at
the surface in the upper limb passes through
the lower limb also.
• Ø The lower limb is often called the inverted
limb or the reversed limb.
24. • Other parts of a recumbent fold are sometimes
named as follows:
• The arch, which is zone of curvature
corresponding to crest and trough in the
upright folds;
• The shell, which is the outer zone made up
mostly of sedimentary formations;
• The core, which is the innermost part of the
fold and maybe made mostly of crystalline
igneous or metamorphic rocks;
25. • The root or the root zone, which is the basal
part of the fold and may or may not be
easily traceable; once traced it can throw light
whether the fold was originally an anticline or
syncline that has suffered further inversion.
26.
27. • Conjugate Folds
• In certain cases a pair of folds that are
apparently related to each other may have
mutually inclined axial planes.
• Such folds are described as conjugate folds.
• The individual folds themselves may be
anticlinal or synchnal or their modifications.
28.
29. • Box Fold
• It may be described as a special type of fold
with exceptionally flattened top and steeply
inclined limbs almost forming three sides of a
rectangle.
30.
31. • In both the anticlinorium and synclinorium,
presence of large number of secondary folds,
faults and fracture systems is a characteristic
feature.
• Similar folding but signifying still larger
bending and uplifting of strata on
subcontinental scales is expressed by the terms
GEANTICLINES AND GEOSYNCLINES
respectively.
• Great importance is attached to the major
depressions, the geosynclines, in the process of
mountain building discussed elsewhere.
32. • The geosynclines are believed to serve as
depositional fields or basins of sedimentation
to which sediments derived by the erosion of
the adjoining gentilities get accumulated and
compacted.
• This material is then compressed and uplifted
in the second stage of orogeny, to gradually
take the shape of mountain systems.