Sedimentary Structures & Rocks: Types, Indicators and Depositional Features
Unit 3a: Sedimentary Structures
Definition
Sedimentary structures are physical features formed during or just after deposition of sediments.
They give information about:
- Depositional environment
- Direction of current
- Energy conditions
- Younging direction of strata
1. Bedding
Bedding refers to layering in sedimentary rocks. Each layer is called a bed. Beds form when one layer of sediment is deposited over another. Bedding planes separate beds of different composition, texture, or color. Thickness of beds is
Read MoreFundamental Concepts and Production Methods of Global Energy Sources
∆Q=mc∆T,E=hν=hc/λ,For wind(p=1/2xroxAv*3),For Hyrdro(p=ηroVgh),solar energy= irradiance x area x time.
(1Btu=1055J,1 year=3.15×10*7s,1kWh=3.6×10*6J,c(w)
=4184Jkg-1C-1,1ev=1.6×10*-19J,h=6.625×10*-34Js)
What are the main characteristic of fossil fuels?
Ans: Fossil fuels stored a large amount of chemical energy which is converted into
various other forms of energy by burning them.
How does wind power generate electricity?
Ans: – Electricity is generated by using a wind turbine.
Wind turbine consists
Hydrology and Earth Science Calculation Reference
Hydrological Calculations and Formulas
Lysimeter Evapotranspiration (ET) Calculation
The Lysimeter method calculates Evapotranspiration (ET) based on mass change:
- Total Mass Change: (Initial Mass + Water Added) – (Final Mass + Water Lost) = 10 kg
- Daily Weight Change: 10 kg / 5 days = 2 kg/day
- Convert to Volume: 2 kg/day = 0.002 m³/day (Assuming 1 L = 1 kg and 1 L = 0.001 m³)
- Convert to Depth (m/d): 0.002 m³/day / Area of Bucket = 0.0002 m/day
- Convert to mm/d: 0.0002 m/day × 1000 = 0.2 mm/day
Groundwater
Read MoreGeological Structures and Rock Classifications
Folds: Bending of Rock Layers
Folds are wave-like undulations in rock strata. They are most common in sedimentary rocks.
Origin and Mechanism of Folds
Folds originate primarily due to Compressional Stress. When rocks are pushed together, they shorten and thicken.
Ductile Deformation: Folds form deep within the crust where high temperature and pressure allow rocks to bend without breaking.
Tectonic Forces: Major fold belts (like the Himalayas) originate from the collision of tectonic plates.
Classification
Read MoreEnergy Classification and Natural Production Factors
Energy Classification and Resources
Energy can be classified as primary, secondary, or final energy resources. Primary energy or energy resources are those obtained directly from nature. These are categorized into renewable and non-renewable sources.
Primary Energy Sources
Renewable Energy
Renewable energy sources contain inexhaustible resources. However, they are often not directly applicable to production processes and must be transformed into secondary energy. Examples include:
- Hydro
- Solar
- Wind
- Biomass
- Geothermal
- Tidal
Non-
Read MoreSedimentary Rocks: Detrital, Organic & Chemical Types
Detrital (Mechanical) Origin
Detrital or mechanical origin: mineral particles formed by the mechanical disintegration of other rocks. These particles are transported by agents such as water and accumulate as sand, gravel, blocks, ash and other clastic material.
Sandstone
Sandstone: an intermediate clastic rock formed from mechanically derived granules. It consists of consolidated masses of sand held together by a cement. Sandstone is essentially composed of quartz sand.
Cement (Matrix)
Cement: the material
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