_____ is an anticlinal fold formed due to intrusion of rocks.
Diapir
Diapir option is correct.
A diapir is a dome- or mushroom-shaped fold formed when a mobile, low-density material (rock-salt, gypsum, or partially-molten magma) is squeezed upward through denser overlying strata, piercing or arching them into an anticline. Classic examples are the salt diapirs of the Gulf Coast (USA) and the Zagros fold belt (Iran).
Because the intrusion itself creates an anticlinal arch in the country rock, “an anticlinal fold formed due to intrusion” is exactly the diapir definition.
A salt plug is a specific type of piercement diapir but is a narrower term; “dip” is the inclination of a bed, not a fold; a salt glacier (namakier) is the surface outflow of salt from an exposed diapir, not the fold itself.
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