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In the area immediately surrounding an igneous intrusion, a host limestone is locally metamorphosed to produce marble. Which of the following statements is correct?


1.The intrusive igneous rock must be younger than the limestone.


2.The limestone must be younger than the igneous rock.


3.The limestone must be younger than the marble.


4.The relative ages of the three units cannot be determined with the information given.

Answer :

In the area immediately surrounding an igneous intrusion, a host limestone is locally metamorphosed to produce marble. The statement that is correct is "2. The limestone must be younger than the igneous rock."

What is metamorphism?

Metamorphism refers to the transformation of pre-existing rock from one to another due to heat, pressure, or exposure to fluids. Contact metamorphism and regional metamorphism are the two types of metamorphism.

Contact metamorphism occurs when rocks are heated as a result of their proximity to an igneous intrusion and/or contact with hot fluids, whereas regional metamorphism occurs when rocks are subjected to extreme pressure and heat due to plate tectonic movements, burial, or orogenic events.

Therefore the correct option is 2. The limestone must be younger than the igneous rock.

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