Question

On a geological map of a flat area, the plunge direction of an antiformal anticline is

• A. towards the fold closure
• B. away from the fold closure
• C. towards the dip direction of the left limb
• D. towards the dip direction of the right limb

Hint:

For anticlines, the plunge direction is away from the fold closure, while for synclines, the plunge is towards the fold closure.

Answer 1

The Correct Option is A

Step 1: Understanding Plunge Direction.
The plunge of a fold refers to the angle at which the axis of the fold is inclined relative to the horizontal. For an antiform, the fold axis points away from the fold closure.
Step 2: Analyzing the options.
(A) towards the fold closure: Incorrect — The plunge direction of an antiform is away from the fold closure.
(B) away from the fold closure: Correct — In an anticline, the fold axis plunges away from the closure.
(C) towards the dip direction of the left limb: Incorrect — The plunge direction is not towards any limb.
(D) towards the dip direction of the right limb: Incorrect — The plunge direction is away from the fold closure, not towards a specific limb.
Step 3: Conclusion.
The correct answer is (B) away from the fold closure, as this defines the plunge direction of an antiform.