Rocas Metamórficas

Introduction to Metamorphic Rocks

Formation of Metamorphic Rocks

• Metamorphic rocks are formed from pre-existing rocks when subjected to high pressures or temperatures, but always in a solid state.

• If the rocks were to melt, they would become igneous rocks instead of metamorphic ones.

Mechanisms of Formation

• The collision of tectonic plates can lead to increased temperature and pressure, potentially forming magma over time.

• In areas where pressure and temperature rise significantly due to nearby magma, minerals in existing rocks change configuration, resulting in metamorphic rock formation.

Conditions for Metamorphism

• Metamorphism can occur due to increased temperature from proximity to magma or increased pressure during geological processes.

• A small amount of fluid is necessary for the movement of ions and chemical elements within minerals during metamorphism.

Classification of Metamorphic Rocks

Types Based on Appearance

• Metamorphic rocks can be classified based on whether they exhibit a laminated appearance or not.