The resulting rock, which includes both metamorphosed and igneous material, is known as migmatite (Figure \(\PageIndex{5}\)). Metamorphic rock - Metamorphic rock - Structural features: Metamorphic rocks are often intimately related to large-scale (kilometres of tens of kilometres) structural features of Earth. PHYLLITE. 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… Foliated rocks: Metamorphic rock is formed when existing rock (whether it is sedimentary, igneous, or another metamorphic rock) is changed by intense pressure and temperature. You can change your ad preferences anytime. Metamorphic rock - Metamorphic rock - Major features: The most obvious features of metamorphic rocks are certain planar features that are often termed s-surfaces. In other words, these are the rocks that are formed when the igneous and sedimentary rocks change their form under the following two circumstances: Great heat and; If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. The texture can be foliated or nonfoliated. Figure \(\PageIndex{5}\) Migmatite from Prague, Czech Republic. Metamorphic processes. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Email- vyanky.g@gmail.com Foliated Metamorphic Rocks; Crystal Size Mineralogy Parent Rock Metamorphism Rock Name; very fine: clay minerals: shale: low grade regional: slate: fine: clay minerals, biotite, muscovite: shale: low grade regional: phyllite: medium to coarse: serpentine, magnetite, talc, chlorite: peridotite, dunite: low grade regional: serpentinite: fine to medium: blue amphibole, green mica: basalt • Describe how metamorphic rocks are produced by the action of heat, pressure, and fluids on preexisting parent rocks over the course of time. Differentiate between the different forms of metamorphic rocks. Now customize the name of a clipboard to store your clips. 6. Metamorphic rocks are classified on the basis of texture and composition (either mineralogical or chemical) Unlike igneous rocks, which have been plagued by Definition, metamorphism. First, is the fact that metamorphism takes place through heat, pressure, and chemically … Igneous rock is formed through the cooling and solidification of magma or lava. Definition & Formation • They are formed in the solid state as in response to pressure, temperature and chemical active fluids. User: A classification of metamorphic rocks would include whether they are ____.a. In each of the sections, you will find brief descriptions of TEXTURES and MINERAL COMPOSITIONS, and a classification chart based on these characteristics. The sequence of zones now recognized, and the typical metamorphic mineral assemblage in each, are: •Chlorite zone. Metamorphic rocks are characterised by the complete absence of fossils, because fossils embedded in the sedimentary rocks are destroyed by intense heat and pressure. Mobile- 9764484757. Classification of Metamorphic rocks based on texture/structures PHYLLITE -similar to slate, but slightly coarser phyllosilicate grains -grains can be seen in hand specimen, giving silk appearance to cleavage surfaces -often cleavage planes less perfectly planar than slates SLATE -strongly cleaved rock -cleavage planes are developed due to orientation of fine phyllosilicate grains … Texture In metamorphic rocks individual minerals may or may not be bounded by crystal faces. chemical or organic c. foliated or nonfoliated b. intrusive or extrusive d. basaltic or granitic Weegy: A classification of metamorphic rocks would include whether they are: foliated or nonfoliated. Some unfoliated metamorphic rocks, such as hornfels, originate only by contact metamorphism, but others can originate either by contact metamorphism or by regional metamorphism. Figure 7.7 shows an example of this effect. Dr. V. R Ghodake Metamorphic rock - Metamorphic rock - Classification of metamorphic rocks: Because of the diverse chemistry, mineralogy, and primary origin of metamorphic rocks and because of the diverse fabrics or textures that may develop depending on the stresses that may operate during their formation, there is no simple, universally used classification of these rocks. Secondary modifiers can be added to the name to describe the minerals present if appropriate. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. OLDER ROCKS MAY BEOLDER ROCKS MAY BE FORMED INTO A NEW TYPEFORMED INTO A NEW TYPE OF METAMORPHIC ROCKOF METAMORPHIC ROCK 3. If the rock contains >75% modally of one mineral then it may be named by adding the suffix "ite" to the dominant mineral namemineral name • E.g. The simplest planar features may be primary bedding (akin to the layering in sedimentary rocks). 11. Sometimes, the change is due to some chemically active fluids that act on the pre-existing rocks. Metamorphic RocksMetamorphic Rocks • Restate how metamorphic rocks relate to the two other rock groups (sedimentary and igneous). Metamorphic rocks are consequently rocks that have undergone a change or "metamorphosis" from a previous state as a sedimentary, igneous or even another metamorphic rock. As with igneous and sedimentary rocks, metamorphic rocks are classified on the basis of texture(grain size, shape, orientation) and mineral composition. Metamorphic rock, any rock that results from the alteration of preexisting rocks in response to changing conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components. The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Characteristics: planar alignment of microscopic clay grains cause the rock to break in parallel layers (slaty cleavage). igneous rocks formation and their classification, No public clipboards found for this slide. 1. •Garnet zone. Select a rock, and take the appropriate path below to classify the rock. Metamorphic Rocks: The Greek word ‘metamorphose’ which means change of form, is the root of the word metamorphic. FOLIATED METAMORPHIC ROCKS. FORMED BY HEAT ANDFORMED BY HEAT AND Metamorphic rock textures • There are five basic metamorphic textures with typical rock types Basic rock texture Metamorphic rocks Name of foliation Slaty Slate and phyllite; slaty cleavage schistose schist schistosity gneissose gneiss gneissosity granoblastic marbles and quartzite ---- hornfelsic hornfels and skarn ---- 24. The rock also has a strong slaty foliation, which is horizontal in this view, and has developed because the rock was being squeezed during metamorphism. Metamorphic rocks are harder and more resistant to erosion than their parent rocks. The rock has split from bedrock along this foliation plane, and you can see that other weaknesses are present in the same orientation. The Classification of Metamorphic Rocks. See our Privacy Policy and User Agreement for details. However, the classifiction of metamorphic rocks is more difficult to get into than with igneous and sedimentary rocks, for a couple of reasons. Typically, this happens deep within the Earth, or near volcanoes. If you continue browsing the site, you agree to the use of cookies on this website. All metamorphic rocks are divided into two general categories: foliated or non-foliated. 4. Owing to the fact that shales are the most abundant sedimentary rock (60% of … METAMORPHICROCKS G7-MEMBERS Suez University Faculty Of Petroleum & Mining Engineering Petroleum Engineering Depatment 2. 7.2 Classification of Metamorphic Rocks There are two main types of metamorphic rocks: those that are foliated because they have formed in an environment with either directed pressure or shear stress, and those that are not foliated because they have formed in an environment without directed pressure or relatively near the surface with very little pressure at all. User: the chemical makeup of a rock 5. limits and type of metamorphic agents. Metamorphic rock is classified by texture and composition. Clipping is a handy way to collect important slides you want to go back to later. Metamorphic rocks such as, mica-schist split along the bedding planes. Metamorphic RocksMetamorphic Rocks FORMED BY HEAT ANDFORMED BY HEAT AND PRESSUREPRESSURE 2. Title: Chapter 22: A Classification of Metamorphic Rocks 1 Chapter 22 A Classification of Metamorphic Rocks A good name is a concise way of imparting information about a rock 2. Now customize the name of a clipboard to store your clips. Notes on rocks from class. If you look at these rocks carefully you will be able to see these foliations. As already noted, the nature of the parent rock controls the types of metamorphic rocks that can form from it under differing metamorphic conditions. 1. Parent Rock: clay-rich mudstone or shale; Nature of Metamorphism: regional with directed stress; Impt. •Biotite zone. Phyllite is a low-grade foliated metamorphic rock that is intermediate in grade between slate and schist. See our Privacy Policy and User Agreement for details. Key Terms: cementation stratification fossil parent rock metamorphism deform. Metamorphic rock fall into two categories, foliated and unfoliated. Both rock types consist of metamorphic minerals that do not have fl… (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. Looks like you’ve clipped this slide to already. Looks like you’ve clipped this slide to already. 6.2 Classification of Metamorphic Rocks There are two main types of metamorphic rocks: those that are foliated because they have formed in an environment with either directed pressure or shear stress, and those that are massive (not foliated) because they have formed in an environment without directed pressure or relatively near the surface with very little pressure at all. Sedimentary rocks are perhaps the most common rocks found on Earth's surface. Clay minerals that have developed a secondary foliation due to directed pressure are said to have a SLATY CLEAVAGE (or "rock cleavage"). Metamorphic Rock Classification High Strain Rocks Figure 22 -2 . Pelitic rocks are slates or phyllites and typically contain chlorite, muscovite, quartz and albite. Slates give way to phyllites and schists, with biotite, chlorite, muscovite, quartz, and albite. Most foliated metamorphic rocks originate from regional metamorphism. Classification of Metamorphic Rocks High school Earth Science. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. See our User Agreement and Privacy Policy. Start studying Metamorphic Rocks-Description and Classification(1):16/03/20. Vadgaon(Bk), Pune. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. A distinctive kind of foliation is called "schistosity". 4. Metamorphic rocks and processes • Metamorphism comes from the Greek words “Meta” - change “Morphe” - form • Metamorphic rocks form by solid-state (no melting) transformation of preexisting rock by processes that take place beneath Earth’s surface. The change might have been due to an increase in temperature or pressure or both. • Recognize the different types of metamorphism, the processes Foliated rocks have crystals that have been reoriented by pressure. 3. Notes: (6-3 & 6-4) Sedimentary Rocks. If you continue browsing the site, you agree to the use of cookies on this website. Classification – Metamorphic rocks SCMR general guidelines for deriving an appropriateSCMR general guidelines for deriving an appropriate metamorphic rock name GL 2. Quartz and marble are prime examples of unfoliated that can be produced by either regional or contact metamorphism. Clipping is a handy way to collect important slides you want to go back to later. You can change your ad preferences anytime. If you continue browsing the site, you agree to the use of cookies on this website. This large boulder has bedding still visible as dark and light bands sloping steeply down to the right. Each of these will be discussed in turn, then we will summarize how metamorphic rocks are classified. Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rock types, the others being sedimentaryand metamorphic rock. Metamorphic Rocks ( Definition - Classification - Common Rocks ) 1. Classification of metamorphic rocks is based on mineral assemblage, texture, protolith, and bulk chemical composition of the rock. No public clipboards found for this slide. Learn vocabulary, terms, and more with flashcards, games, and other study tools. PRESSUREPRESSURE. You laboratory instructor will supply a set of igneous rocks, a set of sedimentary rocks, and a set of metamorphic rocks. Types of Metamorphism Classification of metamorphic rocks and textur… Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Types of Metamorphism, Texture, Structure of Metamorphic Rocks. Classification of Metamorphic Rocks 1. The classification of foliated rocks is based primarily on the type of foliation. Classifications of igneous rocks 1. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Sinhgad College of Engineering, Such features include folds, nappes, and faults with a wide variety of geometries. Browsing the site, you agree to the use of cookies on this website: with... Rock groups ( sedimentary and igneous ) steeply down to the name to describe the minerals present if appropriate,. Sedimentary, or other metamorphic rocks metamorphic rock fall INTO two categories, foliated and unfoliated weaknesses are in. You laboratory instructor will supply a set of igneous rocks, a of.: clay-rich mudstone or shale ; Nature of metamorphism: regional with directed stress ; Impt ( &! Folds, nappes, and you can see that other weaknesses are present in the orientation... 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