Is Marble Regional Or Contact Metamorphism

Before metamorphism the calcite in the limestone is often in the form of lithified fossil material and biological debris.

Is marble regional or contact metamorphism.

B they aid in the movement of dissolved silicate constituents and facilitate growth of the mineral grains. Foliated rocks are the result of intense pressure and sometimes to a lesser degree are also the result of heat. At the beginning the metamorphism of the limestone and 1200 1 500 bar and between 125 180 degrees celsius remote exposure to high pressure and temperature of the marble there. 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.

The metamorphism of the limestone is required by marble extra iron and graphite in smaller quantities. Regional pressure dominated metamorphism occurs over large areas during periods of mountain building. Occurs at low to high temperatures and medium pressure. Changes in rocks caused by tectonic plates pushing together.

A they increase the pressures in deeply buried regional metamorphic zones. The higher temperatures the pyrometamorphism effect as it is known whereby not just most but practically all the marble quarried is of fine commercial grade as i have found out and the new owners of the. 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. Any type of magma body can lead to contact metamorphism from a thin dyke to a large stock.

Contact metamorphism creates marble superior in every way to that of regional metamorphism by the very nature in which it was created. Regional metamorphism causes a layered or platy structure in rocks called foliation. 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. It s no wonder marble is so widely used in buildings sculptures and anything else imaginable.

Some marble also forms by contact metamorphism when a hot magma body heats adjacent limestone or dolostone. 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. C they prevent partial melting so solid rocks can undergo very high temperature regional metamorphism.