Table of Contents
Where does regional and contact metamorphism occur?
These two types of metamorphism mainly differ from each other according to the area in which metamorphism takes place. Moreover, contact metamorphism involves the contact of the rock with magma, while regional metamorphism involves collisions between continent-continent or oceanic and continental plates.
What is the dynamic metamorphism?
Dynamic metamorphism, or cataclasis, results mainly from mechanical deformation with little long-term temperature change. Textures produced by such adjustments range from breccias composed of angular, shattered rock fragments to very fine-grained, granulated or powdered rocks with obvious foliation and lineation.
What is contact and regional metamorphism?
Contact metamorphism is a type of metamorphism where rock minerals and texture are changed, mainly by heat, due to contact with magma. Regional metamorphism is a type of metamorphism where rock minerals and texture are changed by heat and pressure over a wide area or region.
How is regional and contact metamorphism different?
What is contact metamorphism and regional metamorphism?
What is an example of regional metamorphism?
Regionally metamorphosed rocks usually have a squashed, or foliated appearance – examples include slate, schist and gneiss (pronounced “nice”), formed by metamorphism of mudstones, and also marble which is formed by metamorphism of limestone.
When does contact metamorphism occur in a rock?
This is contact metamorphism. Contact metamorphism is the name given to the changes that take place when magma is injected in the surrounding solid rock (country rock). Any type of magma body can lead to contact metamorphism, from a thin dyke to a large stock.
What is the subduction type of regional metamorphism?
The subduction type of regional metamorphism is associated with subduction of an oceanic plate underneath a continent and results in rocks formed at high pressure and relatively low temperatures (blueschist, eclogite).
Where are metamorphic rocks most likely to be found?
The different rock types produced by dynamic metamorphism vary with depth from the surface as, with increasing depth, both the surrounding pressure and temperature increase. Most metamorphic rocks occur in fold mountain belts or cratonic areas. Such rocks cover large areas of the Earth’s crust and are therefore termed regional metamorphic rocks.
Regional metamorphic rock results from regional metamorphism and usually develops a flaky texture. It is distributed most widely in metamorphic rock, from Archean to even Cenozoic. In view of formation time, space, and acting mechanism, the regional metamorphic rock is closely related to the crustal orogeny and great tectonic movement.