• Texture – microscopic to small-scale mesoscopic features of the rock produced by: 1. In many cases, the correlation of metamorphic isograds and their position in the structure implies a genetic relationship between the two. 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. 11 3. Petrography - The branch of geology dealing with the description and systematic classification of rocks, especially by microscopic examination of thin sections. 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 e.g. Along with other properties of these rocks, it helps to characterize and distinguish them from other types of rocks and it aids in their correlation. Grain orientations 4. If you continue browsing the site, you agree to the use of cookies on this website. Change is a result of pressure (directed stress) and heat •Solid state reaction •No net change in chemistry (ideally – role of groundwater) •Recrystallization of … Evolotion of metamorphic belts. • Describe how metamorphic rocks are produced by the action of heat, pressure, and fluids on preexisting parent rocks over the course of time. Cross Bedding. 3 Metamorphism Introduction & Textures & Structures of Igneous Rocks Petrology & Petrography Petrology - The branch of geology dealing with the origin, occurrence, structure, and history of rocks. All images have two views, in plane- and cross-polarized light. Metamorphic Rocks 2 Metamorphic rocks. Foliated metamorphic rocks have four distinguishable types of aligned textures and they normally have a banded or layered appearance. change in Chemical composition, texture and structure; Metamorphic rocks. The textures and structures of biogenic rocks are especially varied in the most common carbonate rocks—limestones and dolomites. Grain distributions 5. 2. • Identify how the textures of metamorphic rocks … 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. If you continue browsing the site, you agree to the use of cookies on this website. “Blastic” or “blasto” is used as a suffix to represent the metamorphic rock equivalent to igneous texture… Intergrain relationships Almost all metamorphic structures are the result of deformation or metamorphic processes, except relict structures. METAMORPHIC ROCKS Rocks that form from other pre-existing rock (sedimentary, igneous, or metamorphic) that have been changed from high temperature and/or high pressure – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 67f87d-ZDczO Metamorphic Texture, 348 pp. petrogenetic principles of metamorphic rocks.] Metamorphic rocks are often intimately related to large-scale (kilometres of tens of kilometres) structural features of Earth. Such features include folds, nappes, and faults with a wide variety of geometries. The driving forces for metamorphism are changes in temperature,pressure,and compo-sition of pore fluids. There are textures during sedimentation (primary - sedimentation), at the stage of diagenesis and subsequent changes (secondary - diagenetic and catagenetic). An Introduction to Metamorphic Rocks "Metamorphic rocks form from other rocks (protolith) by essentially solid-state changes in mineralogy and/or texture as a result of a change in chemical and/or physical environment. For a limited time, find answers and explanations to over 1.2 million textbook exercises for FREE! Structure and Texture Anastasia Neni Metamorphic structure • Foliation; planar rock fabric (e.g. Journal of Petrology, 2, 277–311. All Time Show: Recommended. Miyashiro A. Structures in Metamorphic Rocks: The structures of the metamorphic rocks are: (i) Slaty structure, (ii) Schistose structure, (iii) Gneissose structure, and (iv) Granulose structure. Texture In metamorphic rocks individual minerals may or may not be bounded by crystal faces. These changes produce new minerals,new textures,and new structures with-in the rock body. These can range from textures similar to the original protolith at low grades of metamorphism, to textures that are purely produced during metamorphism and leave the rock with little resemblance to the original protolith. It is generally by the texture that a geologist will first recognize whether a rock is igneous,will first recognize whether a rock is igneous, sedimentary, or metamorphic, before they get down tosedimentary, or metamorphic, before they get down to the business of identifying the rock or naming it.the business of identifying the rock or naming it. Over time, this collection should become more orderly and comprehensive, but don't hold your breath. American Military University • INTRO INTO SCIN139, American Military University • ERSC181 B001, American Military University • SCIN 138 138, Chapter 11_Metamorphic Textures and Naming a Metamorphic Rock(1).ppt, Texas A&M University, Corpus Christi • GEOL 3326. Now customize the name of a clipboard to store your clips. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. (1961). Examples include slate, gneiss, phyllite, and schist. Grain sizes 3. "Metamorphism takes place in a variety of geologic settings. causes textural readjustment…but not always deformation!! Those that show none of their own crystal faces are termed xenoblastic. Non-foliated are formed as a result of tectonic movements or direct pressure which makes their formation highly dependent on their pre-existing conditions. This preview shows page 1 - 7 out of 20 pages. From examination of metamorphic rocks, it has been found that metamorphic minerals can be listed in a generalized sequence, known as thecrystalloblastic series, … Grain shapes 2. Textures of this type are described as biomorphic or whole-shell. Sedimentary Textures PowerPoint PPT Presentations. [This is a book that presents all the When rocks are baked by heat of molten magma or squeezed by the movements of huge tectonic plates or by the pressure of overlying thick succession of rocks; They are altered or changed beyond their recognition ; i.e. Looks like you’ve clipped this slide to already. Cleavage Planar Fabric of Preferred Fracture, sub-parallel orientation, non-penetrative. ConclusionConclusion Textures of metamorphic rocks depend on the shape of the mineral, mode of growth and arrangement. Without careful examination by the Geologist, and the recognition of the subtle changes in mineralogy and texture, much time and money can be wasted by drilling past the economic basement. [This paper presents the foundation for the recognition of metamorphic rocks in the various tectonic settings.] Cataclastic - Hornfelsic - Granoblastic - Schistose Textures and structures. Where the remains of organisms, of which the rock is chiefly composed, are well preserved, the texture will depend entirely on the type of organism. Muscovite… (i) Slaty structure: The slaty structure is also called slaty cleavage. Metamorphic textures and mineralogy develop progressively over several hundreds of feet/meters of drilling. Help to identify the original rock type prior to metamorphism. burial, regional metamorphic rocks) – Slaty cleavage – Phyllitic – Schistose – Gneissose – Mylonitic • Non Foliation; equidimentional rock fabric (e.g. Clipping is a handy way to collect important slides you want to go back to later. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. • Magma forms from the melting of existing rocks. The rock possessing slaty cleavage has a unique property of splitting into thin sheets. Metamorphic rocks are former igneous, sedimentary or metamorphic rocks that have changed their texture and composition. (1969). See our Privacy Policy and User Agreement for details. TEXTURE GRAIN medium Medium Fine Fine Fine coarse Scheme for Metamorphic Rock Identification MAP SYMBOL TYPE OF COMPOSITION METAMORPHISM COMMENTS Low-g rade metamorphism of shale Foliation surfaces shiny ... Microsoft PowerPoint - Metamorphic Rocks.ppt Author: Earth Science – features that characterize handspecimen or larger masses of rock. -Favours appearance of new metamorphic phases: loss volume leads to mineral increasing density-Strain energy may overcome kinetic barriers to reactions-Deviatory stress affects the textures and structures, but not the equilibrium mineral assemblage-Pressure (s.l.) Metamorphic. Metamorphic Fabric and Texture FABRIC: Refers to orientation of the crystallographic lattices of the minerals TEXTURE: Refers to mineral distributions or orientations within the rock, overall structure of the rock. You can change your ad preferences anytime. Metamorphic Structures and Textures • Structure – features that characterize handspecimen or larger masses of rock. Metamorphic rocks can be formed from igneous, sedimentary, or previous-ly metamorphosed rocks by recrystallization in the solid state. Those that are bounded by their own crystal faces are termed idioblastic. Cataclastic texture: It is produced under stress and in absence of high temperature, whereby rocks … Oxford: Pergamon. Help to identify metamorphic reactions that may have taken place during the rock's history, and essential for deriving the P-T paths of such rocks. • Recognize the different types of metamorphism, the processes that cause them, and the environments in which they occur. Get step-by-step explanations, verified by experts. Texture of the sedimentary rock is the mutual arrangement of rock fragments, their orientation relative to each other, the bedding surface and the rock as a whole. Spry A. Igneous Rocks PPT | Presentation | PDF: There are 3 nice classes of rocks, igneous, sedimentary and metamorphic, and most of the time, they are easy to inform apart.They’re all connected to the endless rock cycle, moving from one type to a different and dynamic form, texture and even chemical composition of the method. Furthermore, the texture of sedimentary rocks affects such derived properties of these rocks as porosity, permeability, bulk … Role of non government organizations in disaster management, Disaster Management System in India - Notes, No public clipboards found for this slide. Metamorphic rocks exhibit a variety of textures. A general outline of metamorphic settings is shown below. Textures and Structures of metamorphic rocks - Metamorphic Structures and Textures Structure features that characterize handspecimen or larger masses of. - Sedimentary rocks Geology 101 Making sediment Weathering = rock breakdown into smaller rock, or minerals, or chemicals Sediment = result of weathering of rocks ... - Sedimentary and Metamorphic Rocks Chapter 6. Introducing Textbook Solutions. Sedimentary ... Schistose texture (platy or needle-shaped minerals grow in response to differential stress. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. – microscopic to small-scale mesoscopic features of the rock produced by: Almost all metamorphic structures are the result of deformation or metamorphic, The most important metamorphic structure –, These textures are based on the relationship between mineral grains, Larger grains are usually more component minerals than the finer grains, – larger grains in a finer-grained groundmass, Large garnets in metabasite, Gore Mountain, NY, Large garnet in metabasite, Gore Mountain, NY, Granoblastic – equidimensional grains (fine, medium, and coarse). Course Hero is not sponsored or endorsed by any college or university. 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