Question:
Which of the following statements regarding ore deposits is/are CORRECT ?
Which of the following statements regarding ore deposits is/are CORRECT ?
Show Hint
- SEDEX → Both exhalative + replacement ores.
- Rampura–Agucha → SEDEX type (not MVT).
- Orogenic gold → Epigenetic.
- Porphyry Cu–Mo → Fluid boiling is crucial.
- Rampura–Agucha → SEDEX type (not MVT).
- Orogenic gold → Epigenetic.
- Porphyry Cu–Mo → Fluid boiling is crucial.
Updated On: Aug 21, 2025
- Both replacement and exhalative ores are possible in SEDEX type deposits
- Rampura-Agucha Pb-Zn deposit is a Mississippi Valley Type deposit
- Orogenic gold deposit is an epigenetic type deposit
- Fluid boiling in the early stage of magmatic crystallization is responsible for Cu- (Mo) deposits
Show Solution
Verified By Collegedunia
The Correct Option is A, C, D
Solution and Explanation
Step 1: SEDEX deposits.
- SEDEX (Sedimentary Exhalative) deposits form from hydrothermal fluids venting onto the seafloor.
- These can produce both exhalative ores (deposited on the seafloor) and replacement ores (formed by replacement of host sediments).
- Therefore, statement (A) is correct.
Step 2: Rampura–Agucha deposit.
- Rampura–Agucha Pb–Zn deposit (Rajasthan) is the world’s largest SEDEX-type deposit, not a Mississippi Valley Type (MVT) deposit.
- Hence, statement (B) is incorrect.
Step 3: Orogenic gold deposits.
- Orogenic gold deposits form from hydrothermal fluids migrating along shear zones and faults, typically after host rock formation.
- They are epigenetic deposits (formed later than their host rocks).
- Thus, statement (C) is correct.
Step 4: Fluid boiling and Cu–Mo deposits.
- Porphyry Cu–Mo systems form in magmatic arcs.
- Early-stage fluid boiling during magmatic crystallization plays a key role in ore deposition.
- Therefore, statement (D) is correct.
Step 5: Final Answer.
Thus, the correct set of statements is: \[ \boxed{\text{A, C, and D are correct.}} \]
- SEDEX (Sedimentary Exhalative) deposits form from hydrothermal fluids venting onto the seafloor.
- These can produce both exhalative ores (deposited on the seafloor) and replacement ores (formed by replacement of host sediments).
- Therefore, statement (A) is correct.
Step 2: Rampura–Agucha deposit.
- Rampura–Agucha Pb–Zn deposit (Rajasthan) is the world’s largest SEDEX-type deposit, not a Mississippi Valley Type (MVT) deposit.
- Hence, statement (B) is incorrect.
Step 3: Orogenic gold deposits.
- Orogenic gold deposits form from hydrothermal fluids migrating along shear zones and faults, typically after host rock formation.
- They are epigenetic deposits (formed later than their host rocks).
- Thus, statement (C) is correct.
Step 4: Fluid boiling and Cu–Mo deposits.
- Porphyry Cu–Mo systems form in magmatic arcs.
- Early-stage fluid boiling during magmatic crystallization plays a key role in ore deposition.
- Therefore, statement (D) is correct.
Step 5: Final Answer.
Thus, the correct set of statements is: \[ \boxed{\text{A, C, and D are correct.}} \]
Was this answer helpful?
0
0
Top GATE GG Geology Questions
- A type of fold which is relatively sharp and angular at its synformal and antiformal hinges is known as:
- Which of the following time boundaries correspond(s) to major mass extinction events?
Consider two intersecting, north-easterly striking and south-easterly dipping dikes Y1 and Y2, which are exposed on an east-west trending vertical wall of a granite (X) quarry as shown below.
The angle that the dikes make with the horizontal on the quarry wall is
- Which one of the following statements explains why elements Li, Be, and B have low cosmic abundance?
- During a geochemical exploration survey in a hilly terrain, Cu concentration of stream sediments from a third order basin outlet was measured to be 3000 ppm. Considering a catchment area of 10 km\(^2\) and a Cu background value of 200 ppm, which one of the following options is the productivity of this catchment for Cu?
View More Questions
Top GATE GG Ore dressing and mineral economics Questions
- Which one of the following textures is called the chalcopyrite disease?
- Match the following copper deposits in Group-I with their host rocks in Group-II.
Group-I Group-II P Khetri 1 Chlorite-biotite schist and soda-granite Q Mosabani 2 Garnetiferous chlorite schist R Malanjkhand 3 Metachert S Kalyadi 4 Tonalite-granodiorite-granite - Gold is being produced from which one of the following mines in India?
Top GATE GG Questions
Is there any good show __________ television tonight? Select the most appropriate option to complete the above sentence.
As the police officer was found guilty of embezzlement, he was ___________ dismissed from the service in accordance with the Service Rules. Select the most appropriate option to complete the above sentence.
- The sum of the following infinite series is: \[ 1 + \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \frac{1}{4!} + \frac{1}{5!} + \dots \]
- A thin wire is used to construct all the edges of a cube of 1 m side by bending, cutting, and soldering the wire. If the wire is 12 m long, what is the minimum number of cuts required to construct the wire frame to form the cube?
The figures I, II, and III are parts of a sequence. Which one of the following options comes next in the sequence at IV?
View More Questions