Download SGBAU BSc 2019 Summer 2nd Sem Geology Igneous Sedimentary n Metamorphic Petrology Question Paper

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B.Sc. (Part—I) Semester—II Examination

GEOLOGY (New)

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(Igneous, Sedimentary and Metamorphic Petrology)

Time : Three Hours] - [Maximum Marks : 80

Note :— (1) All the questions are compulsory.

(2) Draw well labelled diagrams wherever necessary.

1. (A) Fill in the blanks :
   1. Rocks crystallized at great depth are called — Igneous rocks.

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   2. Thermal metamorphism is due to a factor.
   3. —— is deposits built at mouth of streams usually triangular in shape.
   4. The felsic minerals in igneous rock are — color and in density.
   2
2. (B) Choose the correct alternatives :
   1. The silica content is less than 45 % then rock is known as :
      1. Basic rock

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      2. Ultrabasic rock
      3. Intermediate rock
      4. Acidic rock
   2. Gneiss is :
      1. Igneous rock

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      2. Sedimentary rock
      3. Metamorphic rock
      4. Ore
   3. Why basalt is fine grained than gabbro ?
      1. Basalt has mafic composition

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      2. Gabbro has mafic composition
      3. Basalt formed from quick cooling of magma
      4. Gabbro formed from quick cooling of magma
   4. The particles or grain size of gravel :
      1. 0.1 mm to 2 mm

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      2. More than 2 mm
      3. Less than 1 mm
      4. 0.01 to 0.1 mm
   2

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3. (C) Answer the following in one or two sentences :
   1. What is metamorphic rock ?
   2. What is rudaceous rock ?
   3. What is delta formation ?
   4. What is phase rule ?
   4

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2. What is texture ? Describe in detail the various textures in igneous rock. 12

   OR

   What is igneous rock ? Describe in detail the structures in igneous rock. 12

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3. Explain the following :
   1. Mineralogical character of basalt. 4
   2. Assimilation. 4

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   3. Tabular classification of igneous rock. 4

   OR

   1. Discontinuous reaction series. 4
   2. Characteristic of felsic and mafic minerals. 4
   3. Fractional crystallization. 4

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4. Describe in detail ternary system of diopside, albite and anorthite. 12

   OR

   Describe in detail one component system of augite and quartz. 12

5. Explain the following :
   1. Flood plain deposits. 4
   2. Stratification. 4

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   3. Clastic sedimentary rocks. 4

   OR

   1. Graded Bedding. 4
   2. Types of dunes. 4
   3. Non-clastic sedimentary rocks. 4

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6. Explain the following :
   1. Dynamic metamorphism 4
   2. Palimpsest or relict texture, 4
   3. Maculose structure. 4

   OR

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   1. Thermal metamorphism. 4
   2. Agents of metamorphism. 4
   3. Foliated and non-foliated metamorphic rock. 4

7. Explain the following
   1. Conglomerate. 4

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   2. Autometamorphism. 4
   3. Organic deposits of sedimentary rock. 4

   OR

   1. Stress and anti-stress minerals 4
   2. Limestone. 4

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   3. Hornblende schist. 4

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