1. Intrusive Igneous Rock (e.g., granite, gabbro): These rocks are formed from the cooling and solidification of molten magma. They are generally hot and bring a lot of heat to the surrounding rocks.
2. Any Pre-Existing Rock Type (e.g., sandstone, limestone, shale): The surrounding rocks that come into contact with the hot intrusive igneous rock will be subjected to high temperatures and possibly also pressure. This will lead to changes in their mineralogy, texture, and potentially even chemical composition, resulting in contact metamorphism.
Example: A granite intrusion into limestone will create a zone of contact metamorphism. The heat from the granite will cause the limestone to recrystallize into marble, a metamorphic rock with a characteristic coarse-grained texture.
Important Note: Contact metamorphism is a localized type of metamorphism that occurs when rocks come into direct contact with a heat source, such as a magma intrusion.
