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