Structural Geology (IFS (Forests Services) Geology (Mains)): Questions 1 - 7 of 8

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Question number: 1

» Structural Geology » Folds and Faults Classification and mechanics.Structural Analysis of Folds

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Classification of folds on the basis of orientation of axial plane (Mains Paper -1)

Explanation

Classification of folds

  • Symmetrical folds

    Two limbs dip at the same angel but in opposite directions. In this case the axial plane is vertical and it passes through the crest or trough

  • Asymmetrical folds

    Here the limbs dip at unequal angles in opposite directions. In this case the axial plane is inclined and it not necessarily passes through the crest

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Question number: 2

» Structural Geology » Principles of Geologic Mapping and Map Reading

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Enumerate the tools and equipment required to undertake geological mapping. Explain the importance of geological mapping. (Paper-1)

Explanation

  • Introduction

    • Tools and equipments used for geological mapping

    • Maps:

    • The maps like physical, political, relief, road, physical, and topographic are carried to cover maximum details. It is used as a reference tool in geological mapping.

  • Aerial photographs and stereoscope:

    Aerial photograph is a 3D imagery tool to check volcanoes, caldera and craters. Here

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Question number: 3

» Structural Geology » Principles of Geologic Mapping and Map Reading

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

With the help of case study, describe the methodology for using satellite imagery and GIS to identify potential zones of groundwater. (Paper-1)

Explanation

  • Introduction

    • Groundwater is the source for irrigation and domestic purpose. For domestic purpose – rural areas use and urban areas use . The rate of groundwater flow is controlled by two properties of the rock: porosity and permeability.

    • Remote sensing data combined with Geographical Information System (GIS) technique is very efficient

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Question number: 4

» Structural Geology » Joints and Faults

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Describe unconformities and their types, and give the various criteria to distinguish them from faults.

Explanation

    • Introduction

      When the sedimentary rock beds deposit without any interruptions they are called as conformable. If there are any interruptions in sedimentation then they are called as unconformities.

    • Unconformity

      • Major breaks in sedimentation are called as unconformities. An unconformity is an old erosion surface, which separates younger series of rock

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Question number: 5

» Structural Geology » Stress Andstrain Ellipsoid and Stress-Strain Relationships of Elastic

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

How are stress and strain related to each other? Explain the stress – strain curves in terms of brittle, ductile and viscous materials. (Paper-1)

Explanation

  • Stresses applied to a rock mass can be resolved into three mutually perpendicular directions. These directions are called as “axes of stress” and their magnitude is expresses as greatest, intermediate and least. When the magnitude of stress for each axis is equal, the stresses are said to be hydrostatic. Under such stresses, the volume of rock chan

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Question number: 6

» Structural Geology » Time - Relationship between Crystallization and Deformation

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Appeared in Year: 2017

Essay Question▾

Describe in Detail

Write Note on: Petrofabric analysis (Mains)

Explanation

  • Introduction

    • Petrofabric is the study of deformation features in the rocks, usually at the grain stage. The studied features are distribution, morphology and Orientation caused by fractures, twinning, pressure solution and recrystallization fabrics.

    • Petro fabrics provide information on,

    • Mechanism of deformation

    • Orientation and magnitude of principal st

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Question number: 7

» Structural Geology » Plastic and Viscous Materials. Strain Markers in Deformed Rocks

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Appeared in Year: 2019

Essay Question▾

Describe in Detail

Enumerate the strain markers in deformed rocks with the help of neat sketches.

Explanation

Introduction

  • The deformation in rocks due to stress causes the strain. The strain is measured with respect to the changes in length, volume and angular relationship between lines.

  • The deformation includes,

    • Translation which is change in position

    • Orientation is change in rotation

    • Dilation change in size

    • Distortion change in shape

  • The objects of known initi

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