GEOLOGY
Paper II
I Time Allowed :Three Hours I !Maximum Marks: 200]
INSTRUCTIONS
Candidates should attempt Questions No. I and
5 which are compulsory, and any THREE of the
remaining questions, selecting at least ONE
question from each Section.
'rh·e number of marks carried by each question
or its part is indicated against each. .
Answers must be written in ENGLISH only.
Neat sketches may be drawn, wherever required.
The attached maps are to be used for answering
Questions No. I and 5 Then the map
may· be detached from the question paper and
attached firmly to your answer book.
SECTION A
1. Answer any four of the following. Answer to questions
and should be in about 150 words
each. 4x10=40
(a)Describe the optical and crystallographic
properties by which an isometric mineral can be
distinguished from minerals of all other crystal
systems.
(b)What are the factors responsible for the
following properties of minerals
(i)colour;
(ii)lustre;
(iii)specific gravity;
(iv)hardness.
Give suitable examples to justify the answer.
(c)Describe the petrographic characteristics of
kimberlite. Write a note on the origin of
kimberlite. Give Indian examples of kimberlite
occurrences.
(d)Draw the phase diagram and describe the T
conditions of metamorphism in which the
alumina-silicate polymorphs andalusite, kyanite
and sillimanite are formed.
(e)Mark the following geological features in the
given outline map of India along with a brief
description
(i)Deccan volcanic province;
(ii)Cuddapah basin;
(iii)Eastern Ghats granulite terrain;
(iv)Closepet granite.

2.(a)Describe the structural classification of silicates
with neat sketches and suitable examples. 20
(b)Write the differences between
(i)solid solution exsolution; and
(ii)isomorphism polymorphism
with suitable examples from minerals. 20

3.Write brief notes on the following
IUGS classification of igneous rocks
Anorthosite, its origin and Indian examples
Contact metamorphism of carbonate sediments
Archean greenstone belt
4.(a)Describe the sedimentary facies in a typical
marine environment. 20
(b)Describe the proxies by which provenance of
sediments can be recognised. 20

SECTION B
5. Answer any four of the following. Answer to questions
and should be in about 150 words each.
4X10=40
Match the following
<img src='./qimages/1356-5a.jpg'>
(b)Mark the following ore deposits in the given
outline map of India along with a brief
description
(i)Zawar zinc-lead deposit;
(ii)Khetri copper belt;
(iii)Byrapur chromite deposit;
(iv)jaduguda uranium deposit.
(c)Describe different structural types of sulphide
minerals with examples.
(d)Write any two diagnostic properties and the
principal uses of the following economic minerals
(i)Chalcopyrite
(ii)Galena
(iii)Chromite
(iv)Hematite
(v)Wollastonite

(e)What are rare earth elements Describe their
significance in understanding the genesis of
igneous rocks.
6.(a)What is magmatic deposit What are the
processes by which magmatic deposits are
formed Explain with examples. 20
(b)Describe the geological characteristics of the
following mineral deposits in India: 20
(i)East coast bauxite deposit;
(ii)Mangampeta barite deposit;
(iii)Gondite type manganese deposit; ·
(iv)Neyveli lignite deposit.

7.(a)Describe various methods of conservation of
mineral resources.
vein type copper ore body is exposed in a
plain area and it is explored by trenching. The
ore body has a strike length of 175m along
NE-SW and the dip is vertical. Six trenches are
made across the ore body at a constant interval
of 25m. Following are the widths of the ore
body measured at these trenches from NE to
SW: 2·9, 1·7, 3·2, 2·1 and 2·7m. The specific
gravity of ore is 2·85. Calculate the tonnage of
ore body up to a depth of 50m assuming that
the ore body is continuous.

8.(a)Describe the variation in silicate mineral
assemblage and silicate structure in the mantle. 20
(b)What is hazard zonation Describe the zonation
mapping of any one natural hazard in the
Indian context.