Optionals IAS Mains Geology: Questions 39 - 43 of 126

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Question 39

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Appeared in Year: 2017 (IFS)

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Short Answer▾

Write short notes on the followings (Paper-II)

Placer deposits

Question 40

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Appeared in Year: 2017 (IFS)

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Essay▾

Describe the sedimentary structures. How they can be used to determine the order of superposition?

To describe sedimentary structures and to determine the order of superposition using sedimentary structures. (Paper-II)

Explanation

Sedimentary Structures

  • The sedimentary rocks are secondary rocks, in which the presence of different layers, beds or strata distinguishes them from the igneous and metamorphic rocks. Sedimentary structures are formed by both organic and inorganic origin.
  • The inorganic structures are classified into
    • Primary and
    • secondary structures
  • In sedimentary structu…

… (306 more words) …

Question 41

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Appeared in Year: 2017 (IFS)

Describe in Detail

Essay▾

A rock of pelitic composition containing muscovite, chlorite, quartz and Na-plagioclase would belong to which metamorphic facies? How does this mineral assemblage change on progressive metamorphism to higher grade?

To explain the mineral assemblage and metamorphic facies of muscovite, chlorite, quartz and Na-plagioclase change on progressive metamorphism to higher grade. (Paper-II)

Explanation

Mineral Assemblage Change and Progressive Metamorphism

  • The metamorphic rocks are classified on the basis of formation, composition and fossil content called as metamorphic facies. Parent rocks of different compositions, if metamorphosed under the same pressure, temperature will contain the same set of definite minerals. They belong to same set of ph…

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Question 42

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Appeared in Year: 2017 (IFS)

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Short Answer▾

Write short notes on the followings (Paper-II)

Uttarakhand natural disaster of June 2013

Question 43

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Appeared in Year: 2017 (IFS)

Write in Short

Short Answer▾

Write short notes on the following: (Paper-II)

Red sea mineralisation