[S..S. ;,2011 1..
. 111'-................ .......


Sl.No. C-DTN-L-HMB


GEOLOGY 2011

Paaper-II
ITime Allowed Three Hours IIMaximum Marks 300 I
INSTRUCTIONS
Each questioii is printed bdth_in'Hindi and in English.
Answers ,must be written in mediu1]1 specified in· the Admission' Certificate issued you, w(dcft .must. be ,stated clearly. on the cover oj answer-book in. the space provided for the purpose. Nq marks.wjll be given, for the answers written'in a medium other than that specified in the Admission Certificate.
s/tould, ,atterrtpt Question Nos., 1 and 5 which are·compulsory, and any three of·Jhe-remqining at. least one questiqn frgm each Section.
Marks, camed by'each question are· indicated at the end of the question.
"Candidates, should;draw diagrams, wherever -necessary.,
1R

Section-A
1. Discuss the follo_Wing with suitable diagrams: lOx6=60
(a) Types of twin laws applicable to feldspar and determination of Ab An ratio
(bJ Crystallization and differentiation of basaltic magma with reference to Bowen's reaction series
Mineral assemblages for granulite facies of metamorphism of metabasites (using ACF and AKF diagrams)

Classification of alkaline rocks, and age and duration of Deccan volcanism

fe) Types of sedimentary structures and their significance
Significance of cerium and europium anomalies and La/Yb ratio in the interpretation of sedimentary environment

2. Write on the following-with neat and labelled diagrams 20x3=60
Bragg's equation and X-ray diffraction techniques for mineral studies

Elements of symmetry and crystallo­graphic notations

Qptical indicatrix of uniaxial and biaxial minerals, and how it help's determining the optically positive and negative crystals

3.
Discuss various types of textures found in volcanic rocks. Comment upon their petrogenetic significance. 20
How and where is the magma generated? Illustrate with neatly labelled diagram, the plate tectonics and various magma generation sites on the Earth. 20
What do you understand by migmatites? Discuss about the theories of granitization. 20

4.
Define geothermometer and geobarometer with examples from metamorphic petrology. 15
Explain for the confinement of glaucophane at high pressure and hornblende at high temperature metamorphism of basic rocks. 15
Account for the appearance of garnet in greenschist facies metapelites. 15
Write the mineral reactions that take place in-pelitic rocks in amphibolite facies metamorphism. 15


Section-B
5. Write notes on the following: 10x6=,=60
Metallogenetic epochs and provinces
Role of pH during froth floatation of Cu-Pb-Zn sulphide ores

Mineralogy and genesis of uranium mineralization in India

Classification of meteorites and definition of equilibrated chqndrite and achondrite

Biogeochemical and geobotanical prospecting of sulphide minerals

Self-potential and induced-potential methods of prospecting


6.
Discuss about source, origin and migration of petroleum. Comment upon various types of oil traps. 15
Describe the mineralogy, micro­structure and the genetic processes involved in the formation of manganese nodules in the present-day ocean. 15

Discuss in brief the mode of occurrence and nature of chromite and PGE mineralization in the Bushveld igneous complex and in Sukinda chromite deposit. 15

Discuss about sampling techniques and vanous methods of ore-reserve estimation. 15


7.
ra) What are the processes of ore formation? Discuss in detail about hydrothermal and supergene sulphide enrichrment processes, citing Indian examples. 30
Discuss about National Mineral Policy. 10
Discuss the conservation of mineral resources. 10
Discuss the ore textures and mineral paragenesis. 10

8. Write notes on the following 15x4=60
Geochemical differentiation of the Earth
Role of high field strength elements in the understanding of the petrogenetic processes
Sea-bed mineral resources and their mining
Radioactive waste disposal