Marble Contact Or Regional Metamorphism

An example of contact metamorphism is the metamorphic rock marble.

Marble contact or regional metamorphism.

Foliated rocks are the result of intense pressure and sometimes to a lesser degree are also the result of heat. Eclogites usually do not show foliation. Burial metamorphism differs from regional and contact metamorphism in that it is the result of rocks being buried deeper into the earth s crust through tectonic movements. These are medium to coarse grained consisting mostly of garnet and green clinopyroxene called omphacite that result from high grade metamorphism of basic igneous rocks.

Contact metamorphism is the name given to the changes that take place when magma is injected in the surrounding solid rock country rock. Marble is created from limestone that has been subjected to heat. Regional metamorphism is associated with the major events of earth dynamics and the vast majority of metamorphic rocks are so produced they are the rocks involved in the cyclic processes of erosion sedimentation burial metamorphism and mountain building events that are all related to major convective processes in earth s mantle. Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism.

Any type of magma body can lead to contact metamorphism from a thin dyke to a large stock. Metamorphism can be instantaneous as in the shearing of rocks at plate boundaries or can take millions of years as in the slow cooling of magma buried deep under the surface of the earth. It s a perfect rock to use because it s soft the white mineral that dominates it is not quartz but calcite it can form either by regional metamorphism or contact metamorphism near igneous intrusions. Regional metamorphism by contrast takes place over large areas and is high grade metamorphism.

Regional pressure dominated metamorphism occurs over large areas during periods of mountain building. Contact metamorphism creates marble superior in every way to that of regional metamorphism by the very nature in which it was created. The three types of metamorphism are contact regional and dynamic metamorphism. Some foliation may be present if the marble contains micas.

Regional metamorphism causes a layered or platy structure in rocks called foliation. The type and intensity of the metamorphism and width of the metamorphic aureole will depend on a number of factors including the type of country rock the. There are three ways that metamorphic rocks can form.