What are the three stages of a salt dome?

What are the three stages of a salt dome?

• A. Pillow stage, Growth stage, Postdiapiric stage
• B. Pillow stage, True piercement stage, Postdiapiric stage
• C. Pillow stage, True fissuring stage, Postdiapiric stage
• D. Pillow stage, True piercement stage, Preclastic stage

Answer: (B)

The sequence describes how a salt dome forms and evolves in the subsurface as buoyant salt moves upward, pierces the surrounding rocks, and then adjusts after piercing. In the pillow stage, salt begins to intrude upward into the surrounding sediments but stays below the surface, creating pillow-shaped bodies as it deforms nearby rock. In the true piercement stage, the diapir grows enough to breach the overlying strata, producing a recognizable salt dome that pushes into and disrupts the surrounding rocks. In the postdiapiric stage, the dome evolves after piercing, with continuing deformation, reorganization of the surrounding sediments, and ongoing adjustments of the salt body. This progression matches the standard description of salt-dome development, so the option listing pillow stage, true piercement stage, and postdiapiric stage is the best choice. Other sequences use terms like growth, fissuring, or preclastic, which aren’t the conventional stages of salt-dome evolution.

The sequence describes how a salt dome forms and evolves in the subsurface as buoyant salt moves upward, pierces the surrounding rocks, and then adjusts after piercing. In the pillow stage, salt begins to intrude upward into the surrounding sediments but stays below the surface, creating pillow-shaped bodies as it deforms nearby rock. In the true piercement stage, the diapir grows enough to breach the overlying strata, producing a recognizable salt dome that pushes into and disrupts the surrounding rocks. In the postdiapiric stage, the dome evolves after piercing, with continuing deformation, reorganization of the surrounding sediments, and ongoing adjustments of the salt body. This progression matches the standard description of salt-dome development, so the option listing pillow stage, true piercement stage, and postdiapiric stage is the best choice. Other sequences use terms like growth, fissuring, or preclastic, which aren’t the conventional stages of salt-dome evolution.