B.Sc. DEGREE EXAMINATION, NOVEMBER 2017
Fifth Semester
Geology
IGNEOUS PETROLOGY
(CBCS 2014 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all the questions.
1. What is magma and classify it?
2. Define pyroclastic deposits.
3. Define rift and grain.
4. Define xenolith.
5. Define incongruent melting point.
6. Define Assimilation.
7. Define acidic igneous rock with an example.
8. Define felsic and mafic minerals with examples.
9. Volcanic and Hypabyssal equivalent of Granodiorite.
10. Define Alkaline rocks with example.
Sub. Code
4BGE5C1
AFF-4481
2
WS6
Part B x 5 25)
Answer all questions by choosing either or
11. Write about magma composition and constitution of
magma.
Or
Write a short note on chemical compositions of the
Earth.
12. Write in brief about kinds of textures.
Or
Write a note on mural joints and columnar joints.
13. Give an account on Albite Anorthite system.
Or
Write a note on Forsterite — Silica system.
14. Write brief note on C.I.P.W classification.
Or
Give a brief account on Tabular classification of
Tyrrel.
15. Write short note on petrography of Lamprophyres.
Or
Give an account on origin of Aplites.
AFF-4481
3
WS6
Part C x 10 30)
Answer any three questions.
16. Write an essay on the forms of igneous rocks.
17. Discuss various structures of igneous rocks.
18. Describe evidences and theories of differentiation.
19. Give a detailed account on principles and parameters in
the classification of igneous rocks.
20. Write a detail note on petrography and origin of Granite.
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