Descriptions should be reasonably comprehensive but clear and succinct, typically no more than two or three sentences. All rocks on Earth are locked into a system of cycling and re-cycling known as the ROCK CYCLE. 1. Microsoft PowerPoint - GY303_Lecture8_Metamorphism.ppt Author:
• Explain how magmas produce a variety of igneous rocks with textures that vary according to the environment of their formation.
Knowing the differences between these 3 types of rocks allows us to learn about Earths past.. Igneous Rocks - Formation Igneous Rocks are formed by melting, cooling, and crystallization of other rocks. Classification of Metamorphic Rock.
Mineral composition forms the basis for naming nonfoliated metamorphic rocks.
Figure 7.1 Metamorphic rock (gneiss) of the Okanagan Metamorphic and Igneous Complex at Skaha Lake, B.C. [This is a book that presents all the Volcanic glass. Spry A. Metamorphic rock:- The rocks which have formed by various types of metamorphic processes on the pre-existing igneous and . Foliated texture is a pervasive layering caused by compositional layering or by the parallel orientation of platy (e.g, mica) or elongate (e.g., amphibole) mineral grains.
Each of these will be discussed in turn, then we will summarize how metamorphic rocks are classified. Included topics are how igneous rocks are formed, extrusive and intrusive igneous rocks, crystal size and formation, pictures and examples or igneous rocks. Metamorphic rocks ppt. high viscosity Igneous Rock Textures- how big are the minerals? Metamorphic Textures provides definitions, descriptions and illustrations of metamorphic textures, as well as the fundamental processes involved in textural development. Engineering Uses of Metamorphic Rocks: The metamorphic rocks are extensively used as building stones. biotite, muscovite). Texture of Igneous rock… Intrusive. One color only. resulting metamorphic rock will have similar composition to parent rock Metamorphic Rocks: Windows into the Earth's Interior Metamorphic rocks form by the alteration of pre-existing rocks in the solid state by heat, pressure, and chemically active fluids. 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. . Oglala Sioux f Metamorphism Danny M. Vaughn, Ph.D., CMS • Metamorphism (meta - change; morphe - form).
Metamorphic Texture, 348 pp. This texture is known as foliation. • Describe how igneous rocks relate to the two other rock groups (sedimentary and metamorphic). • Describe how magma forms and the factors that influence magma's ascent toward the surface and its cooling history. There can be changes in both texture and mineralogy. The three rock types are: igneous, sedimentary and metamorphic. Change is a result of pressure (directed stress) and heat •Solid state reaction •No net change in chemistry (ideally - role of groundwater) •Recrystallization of new minerals from old minerals Interpreted sequential development of a polymetamorphic rock. lecture_07_metamorphic.ppt - Metamorphic Rocks What is a Metamorphic Rock A Metamorphic Rock is a rock that has undergone change from its original form.
Ex: Marble - marble forms when limestone. Metamorphic Rocks "If something is gneiss, don't take it for granite." Metamorphic Agents Pressure (>1,000 times atmospheric pressure) Temperature (>300 degrees C) Chemical Fluids (mineral saturated hot water) Metamorphic Environments Contact (thermal) - intrusion by magma Hydrothermal - ion-rich hot water circulates through cracks Mountain Building - regional metamorphism .
Formation Primary/secondary rocks Earth,s movement/ High temp and pressure Partially/ wholly reconstituted/altered Metamorphic rocks. Igneous rocks form as a result of volcanic activity, hot spots, and melting that . The protolith is subjected to heat (greater than 150 degrees Celsius) and/or extreme pressure causing profound physical and/or chemical change. This book is composed of 11 chapters and begins with a presentation of the metamorphic processes and the production of metamorphic minerals. Metamorphic rocks composed of only one mineral having equidimensional crystals usually are not visibly foliated.
Grain size and shape are properties of individual grains. 3 types of rocks.
Graphical analysis of the relationships between deformation (D), metamorphism (M), mineral growth, and textures in the rock illustrated in Fig ure 23 -44. The most important non-foliated rock is marble. * * * * * * * * * * * * * * * Metamorphic rocks are classified on the basis of texture and composition (either mineralogical or chemical) Unlike igneous rocks, which have been plagued by a proliferation of local and specific names, metamorphic rock names are surprisingly simple and flexible May choose some prefix-type modifiers to attach to . When directed pressure (or directed stress) acts on a rock, it means the stress on the rock is much greater in one direction than another. Rocks like crush breccia, mylonite and slate show this type of structure. Each of these will be discussed in turn, then we will summarize how metamorphic rocks are classified. Not all metamorphic rocks have a foliated texture. (*) METAMORPHIC SEDIMENTARY .
Hand specimen descriptions for metamorphic rocks are like those for igneous rocks. 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. 3 types of rocks There are 3 types of rocks found on Earth: Igneous Sedimentary Metamorphic. Metamorphic texture is the description of the shape and orientation of mineral grains in a metamorphic rock. [This paper presents the foundation for the recognition of metamorphic rocks in the various tectonic settings.] Texture In metamorphic rocks individual minerals may or may not be bounded by crystal faces. Metamorphic rocks are former igneous, sedimentary or metamorphic rocks that have changed their texture and composition. 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.
petrogenetic principles of metamorphic rocks.] Introduction to Petrography -- John Butler, University of Houston; on-line course materials for igneous, sedimentary and metamorphic petrography. 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. •Instead the mineral composition, texture, or chemical composition of the rock changes •Metamorphic rock - rocks that changes form while remaining solid •Metamorphic mineral - minerals that form during metamorphism Igneous rocks form as a result of volcanic activity, hot spots, and melting that . They may be formed simply by being deep beneath the Earth's surface, subjected to high temperatures and the great pressure of the rock layers above. Spry A. There are two major states of molten rock: Magma and Lava. Avg rating: 3.0/5.0. 22 Classification of Metamorphic Rocks Based on Texture 23 Contents • Basic Definitions • Metamorphic Rocks and their Textures • Metamorphism, Plate Tectonics and Metamorphic Facies 24 Differences Between Metamorphic Rocks • The same original rock - for example shale or basalt - may be changed into very different types of metamorphic .
The objective is to tell someone looking at it everything they need to know to recognize it in the field. rocks - metamorphic rocks where mineral grains (crystals) grow and rearrange, but they do not form layers. Microsoft PowerPoint - Metamorphic Rocks.ppt Author: Earth Science IMPORTANT: A metamorphic facies is not a single rock-type but a wide range of minerals that form under similar P-T and fluid composition conditions. Number of Views:1254. Bedrock Of New York State Identifying Characteristics of Rocks Igneous Intergrown crystals Glassy texture Sedimentary Cemented fragments (sediments) Fossils Organic material Metamorphic Banding Foliated The Rock Cycle BONUS: CLASSIFY this rock as igneous . • Rock color. Fabric is a property of grain aggregates. The resulting rock will have a granulitic texture that is similar to a phaneritic texture in igneous rocks.
Shelley (1993) Igneous and Metamorphic Rocks Under the Microscope. Lava is the term given to magma once it reaches the Earth's surface, usually in the form of a volcanic eruption. -Texture and mineral content of metamorphic rocks depend on:-Parent rock composition: a). Compaction: The weight of overlying sediments forces the sediment grains closer together. Evolotion of metamorphic belts. [This paper presents the foundation for the recognition of metamorphic rocks in the various tectonic settings.] They are classified by the way in which they form. Metamorphic rocks DATHAN C S. 2. • Heat, pressure, & chemical reactions alter mineral content, texture (size, shape, & distribution . 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 . Sedimentary texture encompasses three fundamental properties of sedimentary rocks: grain size, grain shape (form, roundness, and surface texture [microrelief] of grains), and fabric (grain packing and orientation). 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. As with igneous and sedimentary rocks, metamorphic rocks are classified on the basis of texture (grain size, shape, orientation) and mineral composition.However, the classifiction of metamorphic rocks is more difficult to get into than with igneous and sedimentary rocks, for a couple of reasons. "Metamorphism takes place in a variety of geologic settings. (1969).
Give an example for a rock with cataclastic structure. Evolotion of metamorphic belts. Extrusive .
Metamorphic Texture, 348 pp. Foliation: defined by alignment of platy minerals (i.e., micas), or creation of alternating light/dark bands.
Miyashiro A. The size scale used for sedimentary, igneous and metamorphic rocks are different Grain Shape: Miyashiro A. Since the change from . Metamorphic rocks form by recrystallization in the solid state because of changes in temperature, pressure, or the composition of pore fluids. A thorough presentation on characteristics and description of all main types of metamorphic rocks. Essential Learning: I can explain how igneous, sedimentary, and metamorphic rocks are formed. 2. Regional Metamorphism Regional metamorphism occurs when rocks undergo increased temperatures and pressures Associated with the formation of mountain belts.
Nonfoliated. CHAPTER 7 - METAMORPHISM AND METAMORPHIC ROCKS (p. 165-186).
Ex: Quartzite - formed from sandstone. In an experiment with cylinders of modeling clay stacked in a block (Figure 10.4, top), pushing down on the clay from above Classification of metamorphic rocks is based on mineral assemblage, texture, protolith, and bulk chemical composition of the rock. Oxford . Pressure can also alter the texture of a rock, resulting in an increase in grain size. • Identify how the textures of metamorphic rocks reflect the
Appearance controlled by composition and size and arrangement of aggregate grains (texture)
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