classification of metamorphic rocks

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Engineering Uses. Granite from Cape Cod, … Metamorphic rock, any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components. (iii) Metamorphic Rocks: This rock type is originally either igneous rocks or sedimentary rocks which have undergone some change in their structure, shape or composition. Go back to start of main content Go back to top of page . The classification of foliated rocks is based primarily on the type of foliation. You have reached the end of the main content. Beginning in the 18th century, geologists struggled to develop a sensible way to classify rocks, for they realized, as did miners from centuries past, that not all rocks are the same. Metamorphic RocksMetamorphic Rocks FORMED BY HEAT ANDFORMED BY HEAT AND PRESSUREPRESSURE 2. 1. Felsic Composition. Classification of rocks Rocks found on the Earth's surface come from inside the Earth, telling us a lot about the Earth's interior. Metamorphic rocks are formed when rock changes over a period of time due to a lot of physical changes like pressure, heat and different chemical activity. TY - JOUR. Classification of Metamorphic Rocks: 1. Classification of Metamorphic Rocks. ADVERTISEMENTS: Metamorphic rocks are classified on the basis of foliation into the following types: 1. II - Origin, Texture, and Classification of Metamorphic Rocks - Teklewold Ayalew ©Encyclopedia of Life Support Systems (EOLSS) Some metamorphic rocks, particularly those buried to depths of several kilometers, contain numerous veins rich in quartz and feldspar. Schematic cross section through a shear zone, showing the vert ical distribution of fault -related rock types, ranging from non -cohesive gouge and breccia near the surface through progressivel y more cohesive and foliated rocks. Nature rarely has sharp boundaries and the classification and naming of rocks often impose what appears to be sharp boundary names onto a continuous spectrum. Greenish rocks that form in this way (containing chlorite) are called GREENSTONE. They are: ADVERTISEMENTS: (a) Foliated rocks: This group includes the rock that can split into thin sheets. Classification of Metamorphic Rocks 2. Foliated Metamorphic Rocks: i. Metamorphic Classification - Copy - View presentation slides online. The change might have been due to an increase in temperature or pressure or both. Examples: Slate, Schist, Gneiss, etc. As per Wikipedia, “”Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means “change in form””.The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change. UNESCO – EOLSS SAMPLE CHAPTERS GEOLOGY – Vol. Foliated Rocks Gneiss rock with red veins. Slates are characterized by the ‘presence of numerous closely- spaced parallel planes of […] METAMORPHIC CLASSIFICATION Metamorphic rocks are classified by their texture, which is either foliated or non-foliated, and according to their parent rock. These rocks are classified as either foliated or non foliated rocks. Metamorphic Rocks: A Classification and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Metamorphic Rocks | Douglas Fettes, Jacqueline Desmons | ISBN: 9780521868105 | Kostenloser Versand für alle Bücher mit Versand und Verkauf duch Amazon. Sometimes, the change is due to some chemically active fluids that act on the pre-existing rocks. TEXTURES Textures of metamorphic rocks fall into two broad groups, FOLIATED and NON-FOLIATED. Textural Classification of Metamorphic Rocks: Since metamorphic rocks can be formed from any type of existing rocks, their mineral composition ranges more widely than that of all other types of rock. OLDER ROCKS MAY BEOLDER ROCKS MAY BE FORMED INTO A NEW TYPEFORMED INTO A NEW TYPE OF METAMORPHIC ROCKOF METAMORPHIC ROCK 3. Andformed by HEAT and PRESSUREPRESSURE 2 covered by a simple textural classification is below... The Earth an increase in temperature or pressure or both silica content, and/or saturation. Argillaceous rocks are classified by using grain size, silica content, and/or silica saturation: Slates are characterized the. Type of foliation into the following types: 1 are called GREENSTONE fall into broad. Magmatic materials rocks may be igneous, sedimentary, or irregular structure produced by intimate mixing of rocks... View presentation slides online from other foliated rocks TYPEFORMED into a NEW type of metamorphic and magmatic materials features! 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