Question

Which of the following processes are correctly matched with corresponding deformation structures?

• A. Pressure solution – rock cleavage
• B. Jointing – plumose markings
• C. Layer parallel compression – buckle folds
• D. Cohesion loss – slickensides

Answer 1

The Correct Option is A, B, C

Correct Associations of Structural Geology Processes 

Step 1: Evaluating the Given Associations

• (A) Pressure solution – Rock cleavage: Correct. **Pressure solution** is a process where minerals dissolve under stress, leading to the development of **rock cleavage**, forming distinct cleavage planes.
• (B) Jointing – Plumose markings: Correct. **Jointing** creates fractures in rocks, which often exhibit **plumose markings**—curved or feather-like surface patterns formed as the fracture propagates.
• (C) Layer parallel compression – Buckle folds: Correct. **Layer parallel compression** causes rock layers to deform into **buckle folds**, where strata bend into wave-like shapes due to compressive stress.
• (D) Cohesion loss – Slickensides: Incorrect. **Slickensides** are polished, striated fault surfaces formed by **fault movement**. They are not directly caused by **cohesion loss**, which refers to the weakening of material bonds.

Step 2: Selecting the Correct Answers

Based on the above analysis, the correct associations are:

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

Final Answer:

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