Geology 2024 Paper II 50 marks 150 words Compulsory Discuss

Q5

Answer the following questions in about 150 words each. (a) Give an account of the geology and the process of formation of aluminium mineral deposits of India. (10 marks) (b) What are the Iron-Titanium oxides associated with igneous rocks ? Add an account of their mineral associations and textures. (10 marks) (c) What is the difference between prospecting and exploration ? Explain the various techniques of sampling. (10 marks) (d) Discuss briefly about the abundance of elements in the Universe. State Oddo-Harkins rule with examples. (10 marks) (e) Describe the natural hazards due to earthquakes. Discuss the mitigation aspects of earthquake hazards. (10 marks)

हिंदी में प्रश्न पढ़ें

निम्नलिखित में से प्रत्येक प्रश्न का उत्तर लगभग 150 शब्दों में दीजिए। (a) भारत में पाए जाने वाले ऐलुमिनियम खनिज निक्षेपों का भूविज्ञान एवं उनके बनने के प्रक्रम का विवरण दीजिए। (10 अंक) (b) आग्नेय शैलों से साहचर्य करने वाले लोह-टाइटेनियम ऑक्साइड क्या हैं ? उनके खनिज संबंध एवं गठन का विवरण दीजिए। (10 अंक) (c) पूर्वेक्षण व गवेषण में क्या अंतर है ? नमूना लेने की विभिन्न क्रियाविधियों की व्याख्या कीजिए। (10 अंक) (d) ब्रह्मांड में तत्वों की प्रचुरता की संक्षिप्त चर्चा कीजिए। ऑडो-हार्किन्स नियम का उदाहरणों सहित उल्लेख कीजिए। (10 अंक) (e) भूकंपीय प्राकृतिक आपदाओं का वर्णन कीजिए। भूकंपों से होने वाली आपदाओं के न्यूनीकरण पहलुओं पर चर्चा कीजिए। (10 अंक)

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Directive word: Discuss

This question asks you to discuss. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'discuss' demands a comprehensive, analytical treatment across all five sub-parts. Allocate approximately 30 words (20% time) to each sub-part, ensuring balanced coverage: for (a) emphasize lateritization process and Indian bauxite belts; for (b) focus on oxide series and exsolution textures; for (c) contrast prospecting-exploration stages and sampling methods; for (d) present cosmic abundance data with Oddo-Harkins illustrations; for (e) integrate hazard types with mitigation strategies. Structure each part with a precise opening statement, 2-3 substantive points, and a concluding link to economic significance or applied geology.

Key points expected

  • (a) Bauxite formation via lateritization of aluminous rocks; major Indian deposits (Eastern Ghats, Gujarat, Madhya Pradesh); karstic vs. lateritic bauxite; economic grade parameters (Al₂O₃ > 40%, SiO₂ < 5%)
  • (b) Iron-titanium oxide series (ulvöspinel-magnetite-ilmenite-hematite); titanomagnetite and ilmenite associations in mafic-ultramafic rocks; oxidation-exsolution textures (ilmenite lamellae in magnetite); oxide-silicate reactions
  • (c) Distinction: prospecting (regional, reconnaissance) vs. exploration (detailed, deposit-scale); sampling techniques: chip, channel, bulk, core; geostatistical considerations; sample reduction and preparation
  • (d) Cosmic abundance: H, He dominance; stellar nucleosynthesis; Oddo-Harkins rule (even Z elements > odd Z neighbors); examples: Fe (Z=26) vs. Mn (25) and Co (27); O, Si, Mg, Fe peak in Earth's crust vs. Universe
  • (e) Earthquake hazards: ground shaking, liquefaction, surface rupture, tsunamis, landslides; secondary hazards (fire, disease); mitigation: building codes (IS 1893), land-use zoning, early warning, community preparedness, retrofitting

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Demonstrates precise geological terminology across all sub-parts: correctly describes lateritization chemistry for (a), distinguishes titanomagnetite-ilmenite series for (b), clarifies prospecting-exploration hierarchy for (c), accurately states Oddo-Harkins with correct even-odd pairing for (d), and comprehensively covers hazard mechanisms for (e); no conceptual errors in genetic processesGenerally correct concepts with minor inaccuracies: vague on lateritization mechanism, conflates some oxide minerals, blurs prospecting-exploration distinction, states Oddo-Harkins without clear examples, lists hazards without mechanistic explanationFundamental misconceptions: confuses bauxite with alumina processing, misidentifies oxide textures, reverses prospecting-exploration sequence, misstates Oddo-Harkins rule, describes hazards generically without geological specificity
Diagram / cross-section15%7.5Includes at least 2-3 relevant diagrams: bauxite profile showing zone zonation (laterite-saprolite-bedrock), oxide exsolution texture sketch, or Oddo-Harkins abundance curve; diagrams are labeled, scaled, and integrated with text to illustrate key processesOne diagram attempted (e.g., simple bauxite section or generic hazard map) with basic labeling; diagrams mentioned but not drawn, or drawn without integration into explanationNo diagrams; or diagrams completely irrelevant (e.g., random stratigraphic column); text references to 'see figure' without actual sketch
Field evidence15%7.5Cites specific field observations: for (a) mentions pisolitic/nodular textures, gibbsite-boehmite mineralogy; for (b) references Bushveld or Skaergaard-type layered intrusions; for (e) cites Bhuj 2001 or Latur 1993 case studies with specific damage patternsGeneric field descriptions without locality specificity; mentions 'field evidence' in abstract terms; no actual case studies or observational details from Indian contextsNo field evidence cited; confuses laboratory observations with field relationships; entirely theoretical treatment without grounding in observable geological phenomena
Quantitative reasoning20%10Incorporates quantitative data: for (a) reserves/grade figures (India: ~3.9 billion tonnes); for (c) mentions sample spacing, tonnage factors, or statistical sampling errors; for (d) presents approximate cosmic abundance values (H ~74%, He ~24%) or abundance ratios; for (e) cites magnitude-intensity relationships or recurrence intervalsScattered numbers without context (e.g., 'India has large reserves'); mentions 'high grade' without thresholds; qualitative treatment of quantitative conceptsNo quantitative content; or incorrect orders of magnitude; confuses grade with reserve figures; purely descriptive without any numerical grounding
Indian / economic relevance25%12.5Strong Indian focus: for (a) specific belts (Panchpatmali, Bagru Hills, Amarkantak), NALCO operations; for (c) GSI/MECL exploration protocols; for (e) NDMA guidelines, Indian seismic zones (IV-V), Himalayan vs. peninsular seismicity; connects all parts to national mineral security or disaster managementMentions India in passing (e.g., 'India has bauxite'); generic economic importance stated without specific Indian context; no connection to policy or institutional frameworkCompletely generic treatment applicable to any country; no Indian examples; ignores economic significance entirely; foreign examples substituted where Indian cases are expected

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