texture of metamorphic rocks ppt

Grain orientations 4. The fabric can be either a planar fabric, called “foliation”, or a linear fabric, called “lineation”. All images have two views, in plane- and cross-polarized light. Academia.edu is a platform for academics to share research papers. The foliated rocks like slate, gneiss and schist are used as roofing material tabletops, staircases, etc. Spry A. Metamorphic rocks undergo deformation during their crystallization as a result ... A mosic of fine to coarse grained anhedral grains, such as marble and granulites ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 1b2dd6-ZDc1Z A hornfels rock is characterized by evenly distributed, very fine‐grained mica crystals that give it a more massive, equigranular appearance. Foliated metamorphic rocks have four distinguishable types of aligned textures and they normally have a banded or layered appearance. petrogenetic principles of metamorphic rocks.] Figure 23-48a. Metamorphic rocks are classified on the basis of texture and composition (either mineralogical or chemical) Unlike igneous rocks, which have been plagued by • Recognize the different types of metamorphism, the processes that cause them, and the environments in which they occur. • Identify how the textures of metamorphic rocks … Interpreted sequential development of a polymetamorphic rock. In general, the grain size of metamorphic rocks tends to increase with increasing grade of metamorphism, as seen in the progression form fine grained shales to coarser (but still fine) grained slates, to coarser grained schists and gneisses. Engineering Uses of Metamorphic Rocks: The metamorphic rocks are extensively used as building stones. Igneous Rocks Igneous rocks are formed by 7-Metamorphic Rock-(2)Structure and Texture - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Even if a complex assemblage is not identifiable at the wellsite, a combination of minerals and textures should allow the rock to be characterized. Metamorphic Rocks. figure will be added pending permission . Oxford: Pergamon. Metamorphic Texture, 348 pp. • Metamorphic – Formed when the composition or texture of a rock changes because of changing temperature, pressure and/or reactions • Sedimentary – form as layers known as strata . A. Metamorphic Rocks What is a metamorphic rock? Grain sizes 3. The texture of a metamorphic rock is a unique product of its mineralogy and metamorphic conditions. The typical texture of metamorphic rocks does not show a sequence of forma- tion of the individual minerals like that evident in igneous rocks.All grains in meta- morphic rocks apparently recrystallize at roughly the same time,and they have to compete for space in an already solid rock body. Non-foliated are formed as a result of tectonic movements or direct pressure which makes their formation highly dependent on their pre-existing conditions. Igneous Rocks Metamorphic Rock ... Rock Layers[1][1].ppt (Read-Only) Author: Chris Brooks A metamorphosed limestone is called a marble. Foliation, lineation, cleavage, schistosity, gneissose structure, hornfels, and granofels are discussed. Examples include slate, gneiss, phyllite, and schist. Journal of Petrology, 2, 277–311. 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. Miyashiro A. Previous Types of Metamorphism … Evolotion of metamorphic belts. Grain distributions 5. (D), metamorphism (M), mineral growth, and textures in the rock illustrated in Figure 23-46. Parent rock: protolith Metamorphism: path from protolith to final rock. metamorphic 2 • Some are formed from melts (igneous), by solidifying sediments like sand or clay (sedimentary) and by re-crystallising previously formed rocks in its solid state (metamorphic). The rock has split from bedrock along this foliation plane, and you can see that other weaknesses are present in the same orientation. • Texture – microscopic to small-scale mesoscopic features of the rock produced by: 1. (these rocks are very dense) Types of Regional Metamorphism Pressure from being squished by other sediments Pressure from plate movement (mountain building) Texture of Metamorphic Rocks Foliated Metamorphic Rocks - rock has a layered or banded appearance. Metamorphic Rocks What are metamorphic rocks Factors controlling metamorphism Kinds of metamorphism Classification of metamorphic rocks. The most important non-foliated rock is marble. ... Metamorphic rock aggregate of minerals ... Greenstone isotropic, original texture disappeared. Metamorphic petrology. Metamorphic rock fabrics. Chapter 7 Metamorphism and Metamorphic Rocks Introduction Metamorphism - The transformation of rocks, usually beneath Earth's surface, as the result of heat, pressure ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3ce67f-Yjk3O Metamorphic rocks are classified according to their source rock type, structure, microstructure and mineral scheme for Classification of Igneous Rocks and the 3.1 ROCK CYCLE • A rock is an aggregate of minerals and can be formed by many different processes. From Spry (1969) Metamorphic Textures. This is a somewhat haphazard collection of metamorphic textures and rocks seen in thin section, with some discussion of the processes thought to have made them. (1969). This large boulder has bedding still visible as dark and light bands sloping steeply down to the right. Ex: Gneiss & Schist. When rocks (especially shales and basalts) are affected by contact metamorphism, they often develop a texture called hornfels. [This paper presents the foundation for the recognition of metamorphic rocks in the various tectonic settings.] 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 Typically metamorphic rocks develop some kind of metamorphic fabric during the metamorphic event(s). What are metamorphic rocks? Prentice Hall. A thorough presentation on characteristics and description of all main types of metamorphic rocks. minerals can lose water and change minerals reactions may occur between minerals. Winter (2001) An Introduction to Igneous and Metamorphic Petrology. Driving force: increasing P and T Upper limit: dependent on composition; igneous and metamorphic processes overlap in heterogeneous bodies. Figure 7.7 shows an example of this effect. 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 -TEXTURE=sizes, shapes and positions of grains in the rocks TYPES OF ROCKS THE COMPOSITION OF ROCKS IS DETERMINED -BY THE KIND OF MINERALS & -THE AMOUNT MINERALS THAT MAKE IT UP TYPES OF ROCKS 3 TYPES OF ROCKS IGNEOUS SEDIMENTARY METAMORPHIC FORMED WHEN MAGMA or LAVA COOLS AND HARDENS (SOLIDIFIES) 2 TYPES INTRUSIVE MAGMA COOLS SLOWLY … Oxford. Over time, this collection should become more orderly and comprehensive, but don't hold your breath. Increases in heat and pressure and changes in chemical environment can alter the mineral composition and crystalline textures of sedimentary and igneous rocks even though they remain solid … (1961). • Describe how metamorphic rocks are produced by the action of heat, pressure, and fluids on preexisting parent rocks over the course of time. Pergamon. Figure 9 – 4. Chapter 14, 15, 16, 18 Metamorphic rock: aggregate of minerals; composition and fabric reflect changes to new states to adjust to changes in P, T and X and stress. There are a variety of processes involved, and they are collectively described by the term metamorphism.” (Mason, 1990). [This is a book that presents all the This 24-slide PowerPoint presentation describes the classification of metamorphic rocks using texture and composition. Figure 23-48b. 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. View Classifying_Rocks_Power_Point_Presentation.ppt from AA 1Classifying Rocks Rocks are classified as either Igneous, Sedimentary, or Metamorphic. PPT – Metamorphic petrology PowerPoint presentation | free to view - id: 44d248-Nzk3M. Rocks that have changed once another rock Pressure and heat changed the rocks without melting Rock has undergone metamorphism Temperature Heat causes molecular expansion stretches and weakens the bonds in minerals crystals tend to grow larger by joining together. Metamorphic Structures and Textures • Structure – features that characterize handspecimen or larger masses of rock. minerals of the rocks may be changed, or the shapes, may change. Amphibolite Granoblastic textur, micas and most Metamorphic Rocks Presentation - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Grain shapes 2. Bands sloping steeply down to the right to final rock, schistosity, structure. 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