Metamorphic rocks were once sedimentary, igneous, or another metamorphic rock. Metamorphic rocks never melt if they did they would become igneous magma. Note the strong vertical fabric of the canyon wall. A rock is a solid cumulative of minerals located in the earths lithosphere. Amagma must be weathered before it can change to metamorphic rock. Difference between metamorphic rocks and sedimentary rocks. Gold in igneous, sedimentary, and metamorphic rocks by robert s. Geologist made this classification based on the geological process, which formed the given rocks. However, sedimentary rocks may also form in dry, desert environments or in association with glaciers. For each specimen list the texture of the rock on the form for metamorphic rock determination.
Rocks formed by the solid state alteration of pre existing rocks under the influence of heat pressure or chemically active fluids. This video discusses how to identify a metamorphic rocks. Igneous rocks are primary rocks and other rocks sedimentary and metamorphic form. Metamorphic sedimentary igneous metamorphic sedimentary igneous. Then, if sedimentary rocks are subjected to changes in temperature and pressure, the rocks may become metamorphic rocks. Rock cycle is a continuous process through which old rocks are transformed into new ones. Csedimentary rock must melt before it can change to. The overall composition of a metasedimentary rock can be used to identify the original sedimentary rock, even. Naturally occurring not man made solid mixture of minerals other organic matter. The lecture part of the course emphasizes igneous and metamorphic petrogenesis as determined through field and laboratory studies. I found a fantastic way to model how igneous, sedimentary and metamorphic rocks are made to bear while browsing at sylvan dell publishing. A mineral is a naturally occurring substance that is solid and stable at room temperature, representable by a chemical formula. This planar fabric is characteristic of many metamorphic rocks.
Metamorphic rocks are former igneous, sedimentary or metamorphic rocks that have changed their texture and composition. Igneous rocks, sedimentary rocks and metamorphic rocks. Depositional age, provenance and metamorphic age of metasedimentary rocks from southern madagascar article in gondwana research 21. Igneous, sedimentary and metamorphic rocks science struck. Under certain temperature and pressure conditions, the metamorphic rock will melt and form magma. Igneous, sedimentary, and metamorphic rock flashcards. In other words, these are the rocks that are formed when the igneous and sedimentary rocks change their form under the following two circumstances. All the rocks described in this spread are foliated. The temperature deep inside the earth is much hotter. Metamorphic rocks metamorphic rocks rocks that have been subjected to either enough heat or pressure to cause the minerals in that rock to undergo solid state chemical changes. Igneous, sedimentary, and metamorphic rocks lesson plan. Metamorphic rocks are igneous, sedimentary, or preexisting metamorphic rocks that have been changed by great pressures and temperatures within the crust. Pdf on jan 1, 20, mohammad karimpour and others published igneous, sedimentary and metamorphic rocks classfication find, read and. You can clearly see the deformation and features that are characteristic of an entire area.
Igneous rocks are formed by the solidification and cooling of magma in volcanic. Studies of metamorphic rocks provide insights into the physical. Such a rock was first formed through the deposition and solidification of sediment. Gold in lgneous, sedimentary, and metamorphic rocks. Metamorphic rocks use of the metamorphic rock identification chart the identification chart on the following page will be used to identify metamorphic rocks in this exercise.
Rocks are generally classified into three types on the basis of their origin and structure. Then, the rock was buried underneath subsequent rock and was subjected to high pressures and temperatures, causing the rock to recrystallize. They are sedimentary or igneous rocks that have undergone changes as a result of extreme pressure and heat. Rocks are formed on earth as igneous, sedimentary, or metamorphic rocks. All chapters of part ii of the book have been rewritten.
Examples of sedimentary, igneous and metamorphic rocks. Metasedimentary and igneous rocks outcrop over the central portion of the map area designated as im on fig. These are the rocks that form by the effects of heat, pressure, and shear upon igneous and sedimentary rocks. Metamorphic rock metamorphic rock regional metamorphism. Glencoe science earth science chapter 6 sedimentary and metamorphic rocks. Lightcolored dikes and sills of igneous rock cut the metamorphic rocks. Geology 2 sedimentary and metamorphic rocks purpose in this, our final rock identification lab, we will be looking at sedimentary and metamorphic rocks. A solid, cohesive aggregate of grains of one or more mineral.
Igneous, sedimentary and metamorphic rocks nurturing. Right hornfels in thin section from a sedimentary protolith. In the previous two lectures we covered the nature and classification of igneous and sedimentary rocks. Metamorphic rock is formed underground through a process that changes a rock s molecular structure due to pressure, heat and chemical reactions. This sciencestruck writeup lists a few facts about the composition of these rocks. Also, the chapters introduction and grade have undergone several major changes. Glencoe science earth science chapter 6 sedimentary and. Under high temperature and pressure, the sediment becomes compacted. Sedimentary rocks are quite difficult to classify, as they have several different defining qualities the chemical makeup. Metasedimentary rock an overview sciencedirect topics.
Rock cycle notes three types of rocks sedimentary igneous metamorphic sedimentary rocks sediment is produced through the process of weathering. Rock cycle rocks do not remain in their original form for long but may undergo transformation. Igneous rocks form from magma, which is not a rock since it is a fluid and sedimentary rocks lithify. These rocks are physically deformed and chemically changed due to. Grade of metamorphism metamorphic grade is a general term for describing the relative temperature and pressure conditions under which metamorphic rocks form. The name defines their formation whereby meta means change and morph means form.
Thus coarse grained metamorphic rocks involve long times of metamorphism. Metamorphic rocks are the rocks formed from other rocks. Seabed relief on bedrock reaches 40 m in places over a horizontal distance of 500 m but is generally less than 6 m fig. The students will then make a chart on the poster boards labeled metamorphic, igneous, and sedimentary. Appendix b classification of metamorphic and other compositegenesis rocks, including hydrothermally altered, impactmetamorphic, mylonitic, and cataclastic rocks version 1.
Rock property measurements and analysis of selected igneous. Rocks are constantly modified by the action of different geological agents, such as water or wind, and by living beings. Experiments suggest that the time involved is tens of millions of years. Metamorphic rocks are an important topic in geology. Metamorphic rocks formed from parent sedimentary rocks are called parametamorphite e. Igneous rocks form when rocks are heated to the melting point which forms magma. Which characteristic of nonsedimentary rocks would provide the least evidence about the environment in which the rocks were formed. According to the geological significance igneous and metamorphic rocks make up 9095% of the top 16 km of the earths crust by volume. Glencoe science earth science chapter 8 mass movements, wind, and galciers 19 terms. Rock collection and id chart 18 rocks igneous, metamorphic, sedimentary from dinosaurs rock.
Textures and structures of metamorphic rocks and various mechanisms behind the formation of these textures. The texture will be either foliated of nonfoliated and should. As students of the planet earth, every geologist must have a solid foundation in petrology, regardless of specialization or interest. Have the students classify the rocks as igneous, sedimentary, or metamorphic, and then try to interpret the rock origins. This new edition of petrogenesis of metamorphic rocks has several completely revised chapters and all chapters have updated references and redrawn. Request pdf depositional age, provenance and metamorphic age of metasedimentary rocks from southern madagascar southern madagascar is the core of a 1million km2 gondwanan metasedimentary belt. Then, if the magma cools, new igneous rock will form. Igneous, sedimentary and metamorphic rocks the building blocks of landforms rocks we have now seen the relationship between elements and minerals. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The number of gold an a 1 y s e s made on common types of rocks is. Metamorphic rock types are classified as originally either igneous or sedimentary, but their character has been changed by processes operating below the surface of the earth.
Rocks in the earths crust can be broadly categorized in to three types. There are a variety of processes involved, and they are collectively described by the. Depositional age, provenance and metamorphic age of. To explain their origin, geologists draw analogies with what they can observe.
A metamorphic rock used to be some other type of rock, but it was changed inside the earth to become a new type of rock. Which characteristic of nonsedimentary rocks would a. Similarly, those resulting from original igneous rocks are known as orthometamorphite say, formed from granite and granodiorite. Metamorphic rocks are some of the oldest on earth, are. Elements combine chemically to form minerals how does this fit into our understanding of what rocks are. Layers of sedimentary rock metamorphic rock hot magma 9 sedimentary, igneous and metamorphic rocks and strength of slate make it ideal for use in buildings, especially in roofing and floor tiles. Change is a result of pressure directed stress and heat solid state reaction no net change in chemistry ideally role of groundwater recrystallization of. Types of rocks sorting cardsthese beautiful cards make learning about types of rocks fun and easy. Foliated rocks produced by regional metamorphism these rocks have all been affected by pressure, to some degree, during regional metamorphism. Rocks are basically classified into igneous, sedimentary, and metamorphic rocks. Some form during mountainbuilding by forces of others from the heat of igneous intrusions in regional metamorphism others from the heat of igneous intrusions in contact metamorphism. Large rocks are broken down very gradually and the smaller pieces are transported by wind, water, and ice. Metamorphic rocks and processes metamorphism comes from the greek words meta change morphe form metamorphic rocks form by solidstate no melting transformation of preexisting rock by processes that take place beneath earths surface. Sedimentary rocks are formed from the cementing together of sediments, or from the compaction squeezing together of sediments, or from the recrystallization of new mineral grains which are larger than the original crystals.
Exploring the etymology of sedimentary, igneous, and. The constituent minerals of the rocks may be changed, or the shapes, may change. Nonfoliated metamorphic rocks do not have aligned mineral crystals. Regional metamorphism is associated with the major events of earth dynamics, and the vast majority of metamorphic rocks are so produced. The greek word metamorphose which means change of form, is the root of the word metamorphic. A series of simple definition matching exercises linked to examination questions together with a powerpoint of the rock types. Sedimentary and metamorphic rocks last modified by.
They can form from sedimentary and igneous rocks, too. Metamorphic rocks are best identified when looking at the rock as you see them in nature. Objectives university of nairobi personal websites. The process of forming a metamorphic rock by altering a pre existing rock. The students will then cut out the pictures and facts of each rock and will be expected to glue each rock in its correct category. A metamorphic rock forms from a parent rock called a protolith. Those major rocks types are igneous rocks, sedimentary rocks, and metamorphic rocks. In the present lecture, we shall go through another, but equally important class of rocks metamorphic rocks that are. The rocks are classified according to their properties. Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form.
Petrologythe study of the nature, composition, origin, and history of rocksis central to understanding earth history. The word metamorphism comes from ancient greek words for change meta and form. Pdf igneous, sedimentary and metamorphic rocks classfication. Any platy minerals they contain take on a preferred alignment known as foliation.
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