IFa s .20 to

81. No. 3383 B-JGT-K-HFB

GEOLOGY
Paper-II

ITime Allowed Three Hours I IMaximum Marks 200 I
INSTRUCTIONS
Candidates should attempt Question Nos. 1 and 5
which are compulsory, and any THREE of the
remaining questions, selecting at least
ONE question from each Section.

The Dumber 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.

Section-A
1. In about 150 words each, answer any four of the following: lOx4=40
Describe application of XRD technique in understanding crystal structure.

Distinguish between Carlsbad twins and Polysynthetic twins in feldspars.

Describe, with neat sketches, nine types of perthites.

Explain Grade concept in regional meta­morphism and their P-T conditions.

Enumerate the modern classification of sandstones.
2.Describe the carbonate group of minerals with respect to variation in their minera­logical and chemical composition, and diagnostic physical properties. Add notes on their paragenesis and alteration.
Describe textures related to equilibrium and fractional crystallization process in Anorthite-Albite system. 20
What are granulites? Discuss conditions of granulite genesis. P-T-Xf 20

4. Write explanatory notes on the following: lOx4=40
Types of unconformity and their stratigraphic significance
Forearc and foreland sedimentary deposits
Origin of evaporites of Western Indian desert
Various primary sedimentary structures used in paleo-current determination in an undisturbed sedimentary sequence
5. Write critical notes on any four of the following in about 150 words each: 10x4=40
anconformity type uranium minerali­zation with examples

Essential compositional requirements of . the minerals used in cement industry

Description of the most suitable mining method followed for hydrothermal mineral deposits

Role of trace elements In the petrogenesis of basalts

Your views on the perceived weaknesses in existing laws for the prevention of atmospheric and groundwater pollution
Describe mode of occurrence, composition and ongin of chromite deposits associated with three types of ultramafic rocks. 20
(b)Explain the geological setting and origin of the petroleum-bearing reservoir rocks in Bombay High. 20
7.Describe geological and geochemical prospecting methods for exploration of gold deposits in greenstone belts of India. 40
.
Describe the structure and composition
of the Lithosphere and the Astheno­
sphere. 20
What causes Tsunamis? Explain
various mitigation and management
measures undertaken in response to­
December 26 Tsunami that struck the
East Indian coast. 20