Question

Which of the following combinations are correctly matched?

• A. Photic zone – biogenic carbonate rocks
• B. Delta – progradational coarsening-up succession
• C. Sabkha – shelf storm deposit
• D. Shelf break – submarine fans

Answer 1

The Correct Option is A, B, D

Correct Associations in Sedimentary Environments 

Step 1: Evaluating the Given Associations

• (A) Photic zone → Biogenic carbonate rocks: Correct. **Biogenic carbonate rocks** typically form in **shallow, sunlit waters** where marine organisms like corals, algae, and foraminifera produce carbonates.
• (B) Delta → Progradational coarsening-up succession: Correct. **Deltas** typically exhibit a **prograding sequence** where **fine sediments** are deposited first, followed by **coarser sediments**, resulting in a **coarsening-upward succession**.
• (C) Sabkha → Shelf storm deposit: Incorrect. **Sabkhas** are **coastal evaporite environments** that form under arid conditions, producing **gypsum, anhydrite, and halite deposits**. They are not associated with **storm deposits** found on shelves.
• (D) Shelf break → Submarine fans: Correct. The **shelf break** marks the **continental shelf's transition** to deeper waters, where **turbidity currents transport sediments**, forming **submarine fans** at the base of the slope.

Step 2: Selecting the Correct Combinations

Based on the above analysis, the correct associations are:

\[ \mathbf{(A),\ (B),\ \text{and}\ (D)} \]

Final Answer:

Thus, the correct options are: (A), (B), and (D).