Introduction to Petrology and Mineralogy (GLYS2111)
Geology, Mining and Environmental Science - GENV
Semester: First Semester
Level: 200
Year: 2019
School/Faculty:
FS
Department: GMES
Lecturer(s): Dr Alice Mufur/Mr. Afahnwie
Course Code: GLYS2111
Course Title: Introduction to Petrology and Mineralogy
Academic Year: Semester:
Date: 15/03/2019 Hall: PBB03 Time: 8:00 – 10:00Hrs Time allowed: 2hours
REPUBLIC OF CAMEROON THE UNIVERSITY OF BAMENDA
Peace-Work-Fatherland P.O. BOX 39 Bambili
SECTION I
1)
Why is crystal structure an important aspect of geology? (3pts)
2)
Why is color not a very good diagnostic feature of minerals?(2pts)
3)
Discuss 5 of the main rock forming .minerals with respect to their occurrences in various rock types.
(l5pts)
4)
The diagram below shows the genesis of various polymorphs of quartz at various physical conditions
represented on a phase diagram in a silica rich melt (the system Si0
2
). Q = alpha quartz. Q = beta
quartz, Tr = trydymite, Cr=crystobalilite, Co=coesite, St-stishovfte. Study it keenly and answer the
questions that follow
I)
Define the terms system, phase and component as used in phase diagrams. (3pts)
II)
How many one phase systems exist in this system? (1pt)
III)
How many triple points are found here? 1(1pt)
IV)
What are the implications or indications of the triple points? (3pt)
v) Calculate the degrees of freedom at points x, v and z and state what each bof them indicates (6pts)
VI) Calculate the total number of components in the system (lpts)
Section II
1.
Define the rock cycle and with the aid of an illustration explain how one rock type can be transformed to
the others (20marks)
2.
Define these terms and concepts as used in petrology
i)
Partial melting
ii)
Aphanitic texture
iii)
Foliation
iv) Metamorphic facies
iv)
Diagenesis
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