The image below shows metamorphism related to the emplacement of an igneous pluton. It is therefore the most widespread and common type of 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. What is Regional Metamorphism. 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. Contact Metamorphism. Regional metamorphism is a type of metamorphism where the formation of a metamorphic rock occurs in a wide area. Which type of metamorphism is most likely produced in this environment? 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. dynamothermal or regional metamorphism. Types of Metamorphism: Regional Associated with Mountain buildings Also known as Dynamothermal - produces both foliated and non-foliated metamorphic rocks. 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. Conditions producing widespread regionally metamorphosed rocks occur during an orogenic event. Foliated Metamorphic Rocks . Foliated metamorphic gneiss. What type of metamorphism would a rock at location A be subjected to? 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). This type of rocks are called hornstones while the term hornfel describes the product of this metamorphism. Plutonic Metamorphism 6. 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. This is also referred as REGIONAL METAMORPHISM and may be considered as the most important as well as prevalent type of metamorphic processes. 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—occurs when great masses of rock change over a wide area due to pressure exerted on rocks at plate boundaries. The collision of twocontinental … NPS photo by Tim Connors. Regional metamorphism. This type of metamorphism occurs with rocks that are buried deep down the Earth’s crust. Regional metamorphism includes any metamorphic process that occurs over a large region. 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. Impact Metamorphism. 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. Burial Metamorphism 5. This involves development of large-scale changes in the structural and chemical constitution of the pre-existing rocks under the combined action of pressure, temperature and fluids. Type # 1. Regional Metamorphism 4. The three main types of metamorphism are: Regional Metamorphism. 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