C S MAINS GEOLOGY Pap e r— II

Q. Discuss the structures of inosilicates with neat sketches and mineralogical examples.

Q. Explain the phenomenon of twinning and discuss the twinning in feldspars with neat
sketches.

Q. What is a peritectic Discuss an appropriate reaction that represents a peritectic.

Q. Explain how granulite facies rocks can be texturally and mineralogically differentiated
from amphibolite facies rocks.

Q. Ripple marks are common in sandstones and siltstones. Why are they rare in conglomerates
and shales

Q. With neat sketches describe the symmetry elements and forms of the normal class of the
isometric system. Name three minerals belonging to this class.

Q. Discuss the classification and chemistry of clay minerals.

Q. While quartz is completely absent in the mantle, why is it the most common mineral on
the continents

Q. What are the different discontinuities within the earth picked up by seismic waves What
are the petrological explanations for each of these discontinuities

Q. What do the following two series signify and what is the difference between the two

Chlorite Biotite Garnet Staurolite Kyanite Sillimanite
Shale Slate Phyllite Schist Gneiss.

Q. What is a Komatiite What is the reason for the spinifex texture shown by
Komatiites From your answer discuss the possible reason why Komatiites are found
mostly in the Archean.

Q. Explain the process of lithification and diagenesis with special reference to limestones.

Q. Discuss the evolution and characteristic features of the major sedimentary basins of India.

Q. Considering the Bowen’s reaction series, discuss how an igneous rock will be affected
during retrogressive transformation.

Q. Explain the difference between syngenetic and epigenetic deposits with neat sketches and
suitable examples.

Q. What are the placer minerals produced from beach sands in India Describe the properties
and uses of any two of these minerals.

Q. Briefly describe the principles and applications of self-potential and induced polarization
methods of electrical prospecting.

Q. What are the chemical parameters which determine the coordination number of a cation
in crystal structure Illustrate with examples of cations in 3-fold and 4-fold coordination
in rock forming minerals.

Q. What are the sources of marine pollution and their effect on marine eco-system

Q. Which one of the two minerals, magnetite and hematite, contains more iron Illustrate
by calculating iron concentration (in wt. of magnetite and hematite. Atomic weight of
Fe 56, O 16.

Q. Explain the process of formation of magmatic sulphide deposit. What is the characteristic
mineral assemblage of magmatic sulphide deposit

Q. Write a note on air-borne magnetic survey and its advantage over ground based magnetic
survey.

Q. What are the methods of underground mining of mineral deposits Add a note on impact
of underground mining on ground surface and environment.

Q. Give a list of the major petroliferous basins of India. Describe the geology and hydrocarbon
occurrence of Bombay High oilfield.

Q. Describe different categories of ore reserves and their application in the Indian context.

Q. Describe the methods of geochemical prospecting and the geological conditions in which
these methods are adopted.

Q. Explain how substitution of one element by another takes place in minerals. Write a note
on solid solution with example from silicate minerals.

Q. Describe the iron ore basins in Singhbhum craton and the characteristics of associated
iron ore deposits.

Q. What are the gravity separation methods of ore beneficiation Describe the process of
heavy media separation of coal.

Q. What is polymorphism in minerals Explain with suitable examples from rock forming
minerals and ore minerals.

Q. Describe different types of radioactive wastes. Write a note on the methods of disposal
of radioactive wastes.