kontakmetamorfos

Kontakmetamorfos, also known as thermal metamorphism, is a type of metamorphism that occurs when existing rock is changed by heat from nearby magma or lava. This heat causes a chemical and physical alteration of the rock, forming a new type of rock called a metamorphic rock. The intensity of the metamorphism depends on the temperature of the intruding magma and the duration of the heating.

The zone of altered rock surrounding an igneous intrusion is called a metamorphic aureole or contact aureole. The size and shape of this aureole are influenced by the size and shape of the intrusion, as well as the permeability of the surrounding rock. Fluids released by the magma can also play a significant role in the metamorphic process, transporting ions and contributing to the recrystallization of minerals.

Common examples of rocks formed through kontakmetamorfos include hornfels, quartzite (from sandstone), and marble (from limestone). These rocks are typically characterized by their fine-grained texture and the presence of new minerals that are stable at high temperatures. The original sedimentary or igneous structures of the parent rock are often obliterated or significantly altered. Kontakmetamorfos is a localized phenomenon, meaning it affects a relatively small area compared to regional metamorphism, which is associated with large-scale tectonic processes.