• Recognize the different types of metamorphism, the processes Dr. V. R Ghodake Sinhgad College of Engineering, Parent Rock: clay-rich mudstone or shale; Nature of Metamorphism: regional with directed stress; Impt. Metamorphic Rocks ( Definition - Classification - Common Rocks ) 1. 3. Definition, metamorphism. Figure \(\PageIndex{5}\) Migmatite from Prague, Czech Republic. Each of these will be discussed in turn, then we will summarize how metamorphic rocks are classified. Now customize the name of a clipboard to store your clips. Owing to the fact that shales are the most abundant sedimentary rock (60% of … 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. limits and type of metamorphic agents. PRESSUREPRESSURE. Clipping is a handy way to collect important slides you want to go back to later. Sometimes, the change is due to some chemically active fluids that act on the pre-existing rocks. This large boulder has bedding still visible as dark and light bands sloping steeply down to the right. The rock has split from bedrock along this foliation plane, and you can see that other weaknesses are present in the same orientation. Phyllite is a low-grade foliated metamorphic rock that is intermediate in grade between slate and schist. Looks like you’ve clipped this slide to already. A distinctive kind of foliation is called "schistosity". Igneous rock is formed through the cooling and solidification of magma or lava. See our Privacy Policy and User Agreement for details. Metamorphic RocksMetamorphic Rocks FORMED BY HEAT ANDFORMED BY HEAT AND PRESSUREPRESSURE 2. 6. igneous rocks formation and their classification, No public clipboards found for this slide. Classification – Metamorphic rocks SCMR general guidelines for deriving an appropriateSCMR general guidelines for deriving an appropriate metamorphic rock name GL 2. Metamorphic rocks such as, mica-schist split along the bedding planes. 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. Metamorphic rocks are characterised by the complete absence of fossils, because fossils embedded in the sedimentary rocks are destroyed by intense heat and pressure. User: A classification of metamorphic rocks would include whether they are ____.a. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. 4. Types of Metamorphism, Texture, Structure of Metamorphic Rocks. Looks like you’ve clipped this slide to already. Figure 7.7 shows an example of this effect. METAMORPHICROCKS G7-MEMBERS Suez University Faculty Of Petroleum & Mining Engineering Petroleum Engineering Depatment 2. Most foliated metamorphic rocks originate from regional metamorphism. (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. Vadgaon(Bk), Pune. Classification of metamorphic rocks is based on mineral assemblage, texture, protolith, and bulk chemical composition of the rock. The classification of foliated rocks is based primarily on the type of foliation. Texture In metamorphic rocks individual minerals may or may not be bounded by crystal faces. 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. •Garnet zone. Pelitic rocks are slates or phyllites and typically contain chlorite, muscovite, quartz and albite. Characteristics: planar alignment of microscopic clay grains cause the rock to break in parallel layers (slaty cleavage). •Biotite zone. The resulting rock, which includes both metamorphosed and igneous material, is known as migmatite (Figure \(\PageIndex{5}\)). Slates give way to phyllites and schists, with biotite, chlorite, muscovite, quartz, and albite. 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 Now customize the name of a clipboard to store your clips. As with igneous and sedimentary rocks, metamorphic rocks are classified on the basis of texture(grain size, shape, orientation) and mineral composition. The texture can be foliated or nonfoliated. 1. All metamorphic rocks are divided into two general categories: foliated or non-foliated. If you look at these rocks carefully you will be able to see these foliations. Both rock types consist of metamorphic minerals that do not have fl… Differentiate between the different forms of metamorphic rocks. Secondary modifiers can be added to the name to describe the minerals present if appropriate. 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. 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; The simplest planar features may be primary bedding (akin to the layering in sedimentary rocks). Metamorphic Rocks: The Greek word ‘metamorphose’ which means change of form, is the root of the word metamorphic. Sedimentary rocks are perhaps the most common rocks found on Earth's surface. No public clipboards found for this slide. You can change your ad preferences anytime. Metamorphic processes. See our User Agreement and Privacy Policy. Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rock types, the others being sedimentaryand metamorphic rock. 4. As already noted, the nature of the parent rock controls the types of metamorphic rocks that can form from it under differing metamorphic conditions. Clipping is a handy way to collect important slides you want to go back to later. You can change your ad preferences anytime. 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. Typically, this happens deep within the Earth, or near volcanoes. Mobile- 9764484757. Metamorphic rock - Metamorphic rock - Structural features: Metamorphic rocks are often intimately related to large-scale (kilometres of tens of kilometres) structural features of Earth. Classification of Metamorphic Rocks High school Earth Science. Quartz and marble are prime examples of unfoliated that can be produced by either regional or contact metamorphism. PHYLLITE. Select a rock, and take the appropriate path below to classify the rock. If you continue browsing the site, you agree to the use of cookies on this website. The Classification of Metamorphic Rocks. 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. Types of Metamorphism Classification of metamorphic rocks and textur… First, is the fact that metamorphism takes place through heat, pressure, and chemically … Definition & Formation • They are formed in the solid state as in response to pressure, temperature and chemical active fluids. OLDER ROCKS MAY BEOLDER ROCKS MAY BE FORMED INTO A NEW TYPEFORMED INTO A NEW TYPE OF METAMORPHIC ROCKOF METAMORPHIC ROCK 3. • Restate how metamorphic rocks relate to the two other rock groups (sedimentary and igneous). You laboratory instructor will supply a set of igneous rocks, a set of sedimentary rocks, and a set of metamorphic rocks. Notes on rocks from class. In each of the sections, you will find brief descriptions of TEXTURES and MINERAL COMPOSITIONS, and a classification chart based on these characteristics. Notes: (6-3 & 6-4) Sedimentary Rocks. User: the chemical makeup of a rock 5. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Clay minerals that have developed a secondary foliation due to directed pressure are said to have a SLATY CLEAVAGE (or "rock cleavage"). If you continue browsing the site, you agree to the use of cookies on this website. 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 … Key Terms: cementation stratification fossil parent rock metamorphism deform. 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. 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. 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. The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. Classification of Metamorphic Rocks 1. Start studying Metamorphic Rocks-Description and Classification(1):16/03/20. FORMED BY HEAT ANDFORMED BY HEAT AND FOLIATED METAMORPHIC ROCKS. 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… Metamorphic rock is classified by texture and composition. Some unfoliated metamorphic rocks, such as hornfels, originate only by contact metamorphism, but others can originate either by contact metamorphism or by regional metamorphism. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Metamorphic rock fall into two categories, foliated and unfoliated. 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. See our User Agreement and Privacy Policy. 1. Email- vyanky.g@gmail.com If you continue browsing the site, you agree to the use of cookies on this website. 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. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The sequence of zones now recognized, and the typical metamorphic mineral assemblage in each, are: •Chlorite zone. 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. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 11. See our Privacy Policy and User Agreement for details. Such features include folds, nappes, and faults with a wide variety of geometries. Metamorphic rocks are harder and more resistant to erosion than their parent rocks. Classifications of igneous rocks 1. Metamorphic rocks are classified on the basis of texture and composition (either mineralogical or chemical) Unlike igneous rocks, which have been plagued by Metamorphic Rock Classification High Strain Rocks Figure 22 -2 . The change might have been due to an increase in temperature or pressure or both. However, the classifiction of metamorphic rocks is more difficult to get into than with igneous and sedimentary rocks, for a couple of reasons. If you continue browsing the site, you agree to the use of cookies on this website. Foliated rocks have crystals that have been reoriented by pressure. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. • Describe how metamorphic rocks are produced by the action of heat, pressure, and fluids on preexisting parent rocks over the course of time. Metamorphic rock - Metamorphic rock - Major features: The most obvious features of metamorphic rocks are certain planar features that are often termed s-surfaces. Metamorphic RocksMetamorphic Rocks We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Such as, mica-schist split along the bedding planes mineral assemblage, texture,,... Akin to the use of cookies on this website vocabulary, terms, and you can see that other are! As dark and light bands sloping steeply down to the layering in sedimentary,... 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