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Ees 301:Igneous Petrology Question Paper

Ees 301:Igneous Petrology

Course:Igneous Petrology

Institution: University Of Eldoret question papers

Exam Year:2013

Answer Question 1 and any 3 other questions.
1.a)Clearly distinguish between a mineral and a rock (5marks)
b)State the concept of the rock cycle and explain the cycle between igneous and sedimentary rocks (5marks)
c)Briefly,describe the major chemical compositional factors that determine the physical properties of magma at any given stage.(5marks)
d)Explain the Bowen''s reaction series.Use an appropriate diagram to illustrate.(10marks)
2.a)Distinguish between major and trace elements in igneous rocks,listing three examples of each type.(5marks)
b)What are hydrophile elements in igneous rocks?Give any three examples.(5marks)
c)What are rare earth elements(REE)?Describe the nature of their occurence in igneous rocks.
3.a)What are isotopes of an element?Give an example (8marks)
b)Give reasons for variations of isotopic composition in igneous rocks.(7marks)
4.a)With the aid of suitable illustration explain the formation of volcanic island arc,stating the nature of the magma produced.(10marks)
b)The East African system is has been and still is tectonically active.Explain briefly, the rift system in terms of plate tectonics and the dominant type of magma that has been erupted within the zone over time.(5marks)
5.a.)Illustrate a Harker diagram and explain the application of such a diagram in igneous petrology.(5marks)
b)What is the difference between tholeiites and alkali basalts?(5marks)
c)Define the following types of rocks:
i)Epiclastic rocks (2marks)
ii)Pyroclastic rocks (3marks)
6.a)Distinguish between hypabyssal and plutonic rocks (5marks)
b)Describe the following types of basic intrusions:
i)Laccoliths (5marks)
ii)Lopoliths (5marks)

Ees 301:Igneous Petrology Question Paper

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