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Ees 302:Metamorphic Petrology Question Paper

Ees 302:Metamorphic Petrology

Course:Metamorphic Petrology

Institution: University Of Eldoret question papers

Exam Year:2012

Question1.
(a).(i)what are metamorphic rocks?
(ii)Explain the change in rock type from sedimentary rock to metamorphic rock and vice versa.
b)Describe the following:
(i)Isochemical metamorphism
(ii)Metasomatism
(c)Describe briefly,impact metamorphism,explaining the mechanism of the metamorphic process and indicate one mineral that commonly characterizes this type of metamorphism.
(d)Explain the following metamorphic terms or textures:
(i)Preferred orientation
(ii)Slate
(e)Explain the type of metamorphism you would expect to be associated with convergent plate tectonic zones.
Question 2
(a)What is a metamorphic mineral assemblage?
(b)What is a phase in a metamorphic rock?
(c)Explain what is meant by a metamorphic rock assemblage being in equilibrium.
(d)Explain the use of a temperature-pressure metamorphic phase diagram.
(e)What are geothermometers and geobarometers in metamorphic petrology?
Question 3
(a)With the aid of a diagram,describe the common type of compositional phase diagram that is used to represent pelitic rock compositions.
(b)What is a migmatite?
Question 4
(a)Metabasalts show a wider range of chemical composition than do fresh basalts.Explain briefly why.
(b)Describe spilites and state the environment in which they are commonly formed.
(c)Explain why isograds are generally difficult to identify in metabasic rocks?
(d)Changes in facies in metabasic rocks may be recognized by changes in composition of certain key index minerals.Illustrate using the minerals amphibole and feldspars.
Question 5
(a)Describe the mineralogy of the marbles and state the factors that influence the formation of the types of minerals.
(b)A common calc-silicate mineral formed in the environment where marble occur is wollastonite.Explain the conditions under which it forms and give an equation for its formation.
(c)For the following metamorphic index minerals (i)zoisite-calcite-biotite (ii)Anorthite-hornblende,(iii)anorthite-pyroxene,in the calc-silicate zone,give the equivalent index minerals in the pelite zone.
Question 6
(a)Distinguish between crystallization and recrystallisation reactions in metamorphic rocks.
(b)What is preferred orientation in metamorphic texture?List three factors or mechanisms that produce preferred orientation.
(c)Explain internal and external schistosity textures in metamorphic rocks.
(d)Explain,using a simple illustration diagram,pressure shadows in metamorphic texture.

Ees 302:Metamorphic Petrology Question Paper

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