Question

Which of the following statement(s) related to ore-forming processes is/are CORRECT?

• A. Lateritization involves eluviation and illuviation processes
• B. Stratiform sediment-hosted copper (SSC)-type deposits are formed at mid-oceanic ridges
• C. Fluid phase separation is the major process of formation of Mississippi Valley (MV)-type deposits
• D. Formation of Superior-type banded iron formation (BIF) is related to the Great Oxidation Event

Hint:

Stratiform ore deposits typically form in sedimentary basins, while the Great Oxidation Event is linked with the formation of BIFs due to the rise in atmospheric oxygen.

Answer 1

The Correct Option is A, D

Step 1: Understanding the Processes.
- Lateritization involves eluviation and illuviation processes: This is correct. In lateritization, weathering leads to the leaching (eluviation) of soluble elements and the concentration (illuviation) of iron and aluminum oxides.
- Stratiform sediment-hosted copper (SSC)-type deposits are formed at mid-oceanic ridges: Incorrect. SSC-type deposits are more commonly associated with sedimentary basins, not mid-oceanic ridges.
- Fluid phase separation is the major process of formation of Mississippi Valley (MV)-type deposits: Incorrect. MV-type deposits are typically formed by hydrothermal fluids in large basins, but fluid phase separation is not the primary process.
- Formation of Superior-type banded iron formation (BIF) is related to the Great Oxidation Event: Correct. The formation of BIFs corresponds to the Great Oxidation Event, when oxygen levels in Earth's atmosphere increased.
Final Answer: \[ \boxed{(A), (D)} \]