This document provides an overview of sedimentary rocks and the processes involved in their formation. Sedimentary rocks are formed from the deposition of materials at the Earth's surface or within bodies of water. They provide information about past environmental conditions and geological history. The key processes involved in sedimentary rock formation are weathering, erosion, transportation, deposition, and diagenesis, which is the chemical and physical changes that occur after deposition. Sedimentary rocks can be divided into clastic sediments like sandstone, chemical sediments like limestone formed by precipitation from solution, and biochemical sediments like coal formed from organic material.
Komattite
Named after the Komati River in South Africa.
first described by Morris and Richard (twins) for ultramafic units in the Barberton Greenstone belt of South Africa.
Mostly of komatiite are Archean age
distributed in the Archaean shield areas.
Also a few are Proterozoic and Phanerozoic.
In all ages komatiites are highly magnesium.
Mostly a volcanic rock; occasionally intrusive.
Mafic rocks were identified as extrusive because of their volcanic textures and structures, and they seem to have been accepted as a normal component of Archean volcanic successions, Abitibi in Canada.
The ultramafic rocks were interpreted as intrusive which are founded as sills and dykes, Barberton in South Africa.
Spinifex texture-typical of Komatiites:
Introduction
Stratigraphy is the study of strata (sedimentary layers) in the Earth's crust, it is the relationship between rocks and time.
Stratigrapher are concerned with the observation, description and interpretation of direct and tangible evidence in rocks to determine the history of the Earth.
The combination of sedimentology and stratigraphy allows us to build up pictures of the Earth’s surface at different times in different places and relate them to each other through the relative ages of rocks
A more modern way of stating the same principle is that the laws of nature (laws of chemistry and physics) that have operated in the same way since the beginning of time.
And thus if we understand the physical and chemical principles by which nature operates, we can assume that nature operated the same way in the past.
Basic principles of stratigraphy
Principle of Uniformitarianism
Principle of Lateral Horizontality
Principle of Superposition
Principle of Cross-cutting Relations
Principle of Inclusions
Principle of Chilled Margins
Correlation
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.
Bowen’s Reaction Series
ROCKS:
There are three kinds of rocks, that are defined on the basis of how they formed.
Igneous Rocks:
are formed from the solidification of molten rock or magma.
Sedimentary Rocks:
form through when materials at the earth's surface (sediments) are buried and hardened (lithified).
Metamorphic Rocks:
are formed when older rocks are changed by heat and pressure without being melted.
Sedimentary texture can be useful in interpreting the mechanisms and environment of deposition. It also has major control over the porosity and permeability of sediment.
Komattite
Named after the Komati River in South Africa.
first described by Morris and Richard (twins) for ultramafic units in the Barberton Greenstone belt of South Africa.
Mostly of komatiite are Archean age
distributed in the Archaean shield areas.
Also a few are Proterozoic and Phanerozoic.
In all ages komatiites are highly magnesium.
Mostly a volcanic rock; occasionally intrusive.
Mafic rocks were identified as extrusive because of their volcanic textures and structures, and they seem to have been accepted as a normal component of Archean volcanic successions, Abitibi in Canada.
The ultramafic rocks were interpreted as intrusive which are founded as sills and dykes, Barberton in South Africa.
Spinifex texture-typical of Komatiites:
Introduction
Stratigraphy is the study of strata (sedimentary layers) in the Earth's crust, it is the relationship between rocks and time.
Stratigrapher are concerned with the observation, description and interpretation of direct and tangible evidence in rocks to determine the history of the Earth.
The combination of sedimentology and stratigraphy allows us to build up pictures of the Earth’s surface at different times in different places and relate them to each other through the relative ages of rocks
A more modern way of stating the same principle is that the laws of nature (laws of chemistry and physics) that have operated in the same way since the beginning of time.
And thus if we understand the physical and chemical principles by which nature operates, we can assume that nature operated the same way in the past.
Basic principles of stratigraphy
Principle of Uniformitarianism
Principle of Lateral Horizontality
Principle of Superposition
Principle of Cross-cutting Relations
Principle of Inclusions
Principle of Chilled Margins
Correlation
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.
Bowen’s Reaction Series
ROCKS:
There are three kinds of rocks, that are defined on the basis of how they formed.
Igneous Rocks:
are formed from the solidification of molten rock or magma.
Sedimentary Rocks:
form through when materials at the earth's surface (sediments) are buried and hardened (lithified).
Metamorphic Rocks:
are formed when older rocks are changed by heat and pressure without being melted.
Sedimentary texture can be useful in interpreting the mechanisms and environment of deposition. It also has major control over the porosity and permeability of sediment.
Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles (detritus) to settle and accumulate or minerals to precipitate from a solution. Particles that form a sedimentary rock by accumulating are called sediment. Before being deposited, sediment was formed by weathering and erosion in a source area, and then transported to the place of deposition by water, wind, ice, mass movement or glaciers which are called agents
Classification of sedimentary Rocks
************************************
Sedimentary rocks are formed by the accumulation of sediments. There are three basic types of sedimentary rocks.
1.Clastic
2.Chemical
3.Organic
for more notes/ppt please visit vinoychakmalibrary.blogspot.in
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
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Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
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When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
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adversary training.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
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2. studying sediments
derive information on the depositional conditions;
rock unit
relation of the individual rock units in a basin into
a coherent understanding of the evolution of the
sedimentary sequences and basins
Earth's geological history as a whole
3. Sedimentary rocks are formed in places where
there has been water at one time.
Dead animals, plants, and pieces of rocks or
minerals are carried to these places by wind,
water, ice, or even gravity.
5. Types of rock that are formed by the
deposition of material at the Earth's surface
and within bodies of water
Indicators of geological processes,
environment (tectonic event), and geological
history.
Contain of mineral resources such as coal,
petroleum, natural gas, iron, gold, aluminum,
uranium, diamond etc.
7. All of the chemical, physical and biological
changes that take place after sediments are
deposited.
Occurs within the upper few kilometers of earth’s
crust
Consist of:
Lithification : unconsolidated sediments are
transformed into solid sedimentary rocks by
compaction and cementation
Natural cements include calcite, silica and iron
oxide.
8. Sediment originates from mechanical and/or
chemical weathering.
Based on the source of material:
i. Detrital (Siliciclastic) sediments: sediment
transported as solid particles
ii. Chemical Sediments : sediment that was once
in solution
iii. Biogenic, Biochemical and Organic sediments
iv. Volcanoclastic sediments.
coal
9. The chief constituents of detrital rocks include:
Clay minerals
Quartz
Feldspars
Micas
Chert Breccia: The angular clasts in this
breccia are chert fragments. The matrix is an
iron-stained mix of clay through sand-size
particles. The specimen is about two inches
(five centimeters) across.
Particle size is used to distinguish among the
various types of detrital rocks.
11. Consist of precipitated material that was
once in solution
Precipitation of material occurs in two
ways:
Inorganic processes
Organic processes (biochemical origin)
12. Limestone
Most abundant chemical rock
Majority composed by mineral calcite
Marine biochemical limestone form as coral reefs,
coquina (broken shells), and chalk (microscopic
organisms)
Inorganic limestones include travetine (limestone
dissolves in place and is redeposited in another) and
oolitic (small rounded particles or grains &
look like fish eggs)
13. Example for inorganic processes:
Chert
Made of microcyrstalline quartz
Varieties include flint and jasper (banded
form is called agate)
Evaporites
Evaporation triggers deposition of chemical
precipitates
Ex: rock salt and rock gypsum