types of regional metamorphism

types of regional metamorphism

Type # 1. What is Regional Metamorphism. 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. 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. 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. This type of metamorphism occurs with rocks that are buried deep down the Earth’s crust. Types of Metamorphism: Produces non-foliated, granoblastic rocks: Hornfels (if clastic - shale) Quartzite (if sandstone) Marble (if carbonate) 19. Foliated Metamorphic Rocks . Regional Metamorphism 4. dynamothermal or regional metamorphism. The three main types of metamorphism are: Regional Metamorphism. This type of rocks are called hornstones while the term hornfel describes the product of this 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. It is therefore the most widespread and common type of metamorphism. Regional metamorphism includes any metamorphic process that occurs over a large region. Regional metamorphism is a type of metamorphism where the formation of a metamorphic rock occurs in a wide area. The collision of twocontinental … What type of metamorphism would a rock at location A be subjected to? Regional metamorphism. Plutonic Metamorphism 6. 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. 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. 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. Conditions producing widespread regionally metamorphosed rocks occur during an orogenic event. This is also referred as REGIONAL METAMORPHISM and may be considered as the most important as well as prevalent type of metamorphic processes. Which type of metamorphism is most likely produced in this environment? Burial Metamorphism 5. There are two main types of metamorphism: Contact metamorphism—occurs when magma contacts a rock, changing it by extreme heat (Figure 4.14). Hydrothermal 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. The image below shows metamorphism related to the emplacement of an igneous pluton. Regional metamorphism—occurs when great masses of rock change over a wide area due to pressure exerted on rocks at plate boundaries. NPS photo by Tim Connors. Impact Metamorphism. Foliated metamorphic gneiss. 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. 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). 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