Regional Metamorphism 4. Conditions producing widespread regionally metamorphosed rocks occur during an orogenic event. The three main types of metamorphism are: Regional Metamorphism. A rock is squeezed under directed pressure during metamorphism it is likely to be deformed, and this can result in a textural change such that the minerals are elongated in the direction perpendicular to the main stress. Burial Metamorphism 5. Regional metamorphism—occurs when great masses of rock change over a wide area due to pressure exerted on rocks at plate boundaries. This type of metamorphism occurs with rocks that are buried deep down the Earth’s crust. Contact Metamorphism. Contact or Thermal Metamorphism: This type of metamorphism takes place when the very hot magma moves up through the crystal rocks and brings with it high levels of heat. Which type of metamorphism is most likely produced in this environment? Foliated metamorphic gneiss. There are two main types of metamorphism: Contact metamorphism—occurs when magma contacts a rock, changing it by extreme heat (Figure 4.14). Regional metamorphism includes any metamorphic process that occurs over a large region. Foliated Metamorphic Rocks . 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. Nearly all traces of the original structures (including fossils) and fabric (such as layering and ripple marks) are wiped out as the minerals migrate and recrystallize. Regional metamorphism. This is also referred as REGIONAL METAMORPHISM and may be considered as the most important as well as prevalent type of metamorphic processes. Types of Metamorphism: Produces non-foliated, granoblastic rocks: Hornfels (if clastic - shale) Quartzite (if sandstone) Marble (if carbonate) 19. What type of metamorphism would a rock at location A be subjected to? Hydrothermal metamorphism. This type of metamorphic was created by regional metamorphism, in which a sedimentary or igneous rock has been deeply buried and subjected to high temperatures and pressures. Regional Metamorphism: A type of metamorphism that affects an extensive region, as opposed to local metamorphism that is effective only in a relatively restricted area. The various types of foliated metamorphic rocks, listed in order of the grade or intensity of metamorphism and the type of foliation are slate, phyllite, schist, and gneiss (Figure 7.8). The collision of twocontinental … dynamothermal or regional metamorphism. NPS photo by Tim Connors. Regional Regional or Barrovian metamorphism covers large areas of continental crust typically associated with mountain ranges, particularly those associated with convergent tectonic plates or the roots of previously eroded mountains. It is therefore the most widespread and common type of metamorphism. Impact Metamorphism. This type of rocks are called hornstones while the term hornfel describes the product of this metamorphism. What is Regional Metamorphism. Plutonic Metamorphism 6. Regional metamorphism is a type of metamorphism where the formation of a metamorphic rock occurs in a wide area. Types of Metamorphism: Regional Associated with Mountain buildings Also known as Dynamothermal - produces both foliated and non-foliated metamorphic rocks. Type # 1. As already noted, slate is formed from the low-grade metamorphism of shale, and has microscopic clay and mica crystals that have grown perpendicular to the stress. 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