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texture of metamorphic rocks ppt

Figure 23-48a. 3.1 ROCK CYCLE • A rock is an aggregate of minerals and can be formed by many different processes. Figure 23-48b. Foliated metamorphic rocks have four distinguishable types of aligned textures and they normally have a banded or layered appearance. The rock has split from bedrock along this foliation plane, and you can see that other weaknesses are present in the same orientation. When rocks (especially shales and basalts) are affected by contact metamorphism, they often develop a texture called hornfels. This large boulder has bedding still visible as dark and light bands sloping steeply down to the right. Over time, this collection should become more orderly and comprehensive, but don't hold your breath. 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 Winter (2001) An Introduction to Igneous and Metamorphic Petrology. What are metamorphic rocks? Metamorphic Rocks. ... Metamorphic rock aggregate of minerals ... Greenstone isotropic, original texture disappeared. • Identify how the textures of metamorphic rocks … Ex: Gneiss & Schist. Figure 9 – 4. … Even if a complex assemblage is not identifiable at the wellsite, a combination of minerals and textures should allow the rock to be characterized. minerals can lose water and change minerals reactions may occur between minerals. Pergamon. Figure 7.7 shows an example of this effect. 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 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. • Recognize the different types of metamorphism, the processes that cause them, and the environments in which they occur. (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. This 24-slide PowerPoint presentation describes the classification of metamorphic rocks using texture and composition. 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. Interpreted sequential development of a polymetamorphic rock. minerals of the rocks may be changed, or the shapes, may change. Grain sizes 3. Driving force: increasing P and T Upper limit: dependent on composition; igneous and metamorphic processes overlap in heterogeneous bodies. 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. [This is a book that presents all the PPT – Metamorphic petrology PowerPoint presentation | free to view - id: 44d248-Nzk3M. The foliated rocks like slate, gneiss and schist are used as roofing material tabletops, staircases, etc. petrogenetic principles of metamorphic rocks.] The most important non-foliated rock is marble. A metamorphosed limestone is called a marble. View Classifying_Rocks_Power_Point_Presentation.ppt from AA 1Classifying Rocks Rocks are classified as either Igneous, Sedimentary, or Metamorphic. (D), metamorphism (M), mineral growth, and textures in the rock illustrated in Figure 23-46. Amphibolite Granoblastic textur, micas and most (1961). figure will be added pending permission . 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. Metamorphic rock fabrics. Metamorphic rocks are classified according to their source rock type, structure, microstructure and mineral scheme for Classification of Igneous Rocks and the The texture of a metamorphic rock is a unique product of its mineralogy and metamorphic conditions. 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. Spry A. Academia.edu is a platform for academics to share research papers. Grain shapes 2. Metamorphic rocks are classified on the basis of texture and composition (either mineralogical or chemical) Unlike igneous rocks, which have been plagued 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. Metamorphic Structures and Textures • Structure – features that characterize handspecimen or larger masses of rock. -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 … 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. • Texture – microscopic to small-scale mesoscopic features of the rock produced by: 1. The fabric can be either a planar fabric, called “foliation”, or a linear fabric, called “lineation”. Metamorphic Rocks What are metamorphic rocks Factors controlling metamorphism Kinds of metamorphism Classification of metamorphic rocks. Previous Types of Metamorphism • 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 . metamorphic 2 A. Miyashiro A. Journal of Petrology, 2, 277–311. • Describe how metamorphic rocks are produced by the action of heat, pressure, and fluids on preexisting parent rocks over the course of time. Grain distributions 5. All images have two views, in plane- and cross-polarized light. • 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). Igneous Rocks Igneous rocks are formed by Typically metamorphic rocks develop some kind of metamorphic fabric during the metamorphic event(s). 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 [This paper presents the foundation for the recognition of metamorphic rocks in the various tectonic settings.] (1969). Parent rock: protolith Metamorphism: path from protolith to final rock. Metamorphic Texture, 348 pp. 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 Engineering Uses of Metamorphic Rocks: The metamorphic rocks are extensively used as building stones. Prentice Hall. A thorough presentation on characteristics and description of all main types of metamorphic rocks. Metamorphic Rocks What is a metamorphic rock? Foliation, lineation, cleavage, schistosity, gneissose structure, hornfels, and granofels are discussed. There are a variety of processes involved, and they are collectively described by the term metamorphism.” (Mason, 1990). Oxford. Non-foliated are formed as a result of tectonic movements or direct pressure which makes their formation highly dependent on their pre-existing conditions. Evolotion of metamorphic belts. Grain orientations 4. From Spry (1969) Metamorphic Textures. A hornfels rock is characterized by evenly distributed, very fine‐grained mica crystals that give it a more massive, equigranular appearance. Metamorphic Rocks Presentation - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Metamorphic petrology. Oxford: Pergamon. 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 … Igneous Rocks Metamorphic Rock ... Rock Layers[1][1].ppt (Read-Only) Author: Chris Brooks Examples include slate, gneiss, phyllite, and schist. 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. Larger masses of rock Engineering Uses of metamorphic rocks in the same orientation minerals the! ( M ), metamorphism ( M ), metamorphism ( M ), metamorphism ( M ), growth! Metamorphic rocks: the metamorphic Petrology rocks rocks are classified as either,... 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