Question

A type of fold which is relatively sharp and angular at its synformal and antiformal hinges is known as:

• A. Fan fold
• B. Drag fold
• C. Chevron fold
• D. Dome

Hint:

Chevron folds are often associated with intense compressional forces and are typically found in regions where tectonic plates are colliding. These folds are recognized by their sharp, angular patterns, especially at the hinges.

Answer 1

The Correct Option is C

Step 1: Understanding the Question
The question describes a type of fold that is sharp and angular at its synformal and antiformal hinges. To answer this, we need to identify which fold type has this characteristic.

Step 2: Identifying Different Fold Types
Fan fold: Fan folds have a more gentle curvature and are typically seen in regions of lower compressional stress. They don't usually have sharp, angular characteristics.
Drag fold: Drag folds are folds that form due to the bending of rock layers during shear stress and typically show a curved or "dragged" appearance. These folds also don't have sharp angular features.
Chevron fold: Chevron folds are characterized by sharp angular shapes, with clear V-shaped or zigzag patterns. The synformal and antiformal hinges in chevron folds are distinct and angular, making them fit the description in the question.
Dome: A dome is a type of fold where layers of rock are bent upwards in a circular shape. While domes can have sharp bends, they are not characterized by the angular geometry at the hinges that the question is referring to.

Step 3: Conclusion
The fold type that is sharp and angular at both its synformal and antiformal hinges is the Chevron fold. This fold type is distinctive for its sharp, angular geometry and its characteristic zigzag pattern.