Question

what type of metamorphism is caused by the heat and pressure from a nearby igneous intrusion altering the surrounding rock without any deformation?
mechanical metamorphism
hydrothermal metamorphism
contact metamorphism
regional metamorphism

Explanation:

• Mechanical metamorphism: Involves deformation due to stress, not just heat and pressure from an igneous intrusion without deformation.
• Hydrothermal metamorphism: Focuses on hot - water fluids altering rocks, not the heat and pressure from an igneous intrusion as the main cause.
• Contact metamorphism: Occurs when rocks are altered by heat and pressure from a nearby igneous intrusion (like a magma body), and there is often little to no deformation (compared to regional metamorphism which involves large - scale tectonic forces and more deformation).
• Regional metamorphism: Affects large areas due to tectonic forces (compression, shearing etc.), not just a local igneous intrusion.

Answer:

contact metamorphism