• Metamorphic Mechanisms

     · Pressure not only influences the rate and degree of metamorphism, with deeply buried rocks requiring more time and heat to undergo a particular metamorphic processs, pressure also causes textural changes in the rock (more later) - how large the crystals are and their orientations - that are so distinctive of metamorphic rocks. The sum total of ...

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  • Geology Chapter 7

    The Earth''s inner core is mostly made of peridotite. false. Metamorphic rocks. rock changed from its o.g condition by heat, pressure, and chemical activity of fluids, as in marble / slate. metamorphism. Phenomenon of rocks changing as result of heat, pressure, and fluids so they are in equilibrium w/ new set of environmental conditions.

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  • metamorphic rock | Definition, Formation, & Facts | Britannica

    Metamorphic rock, any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions, such as variations in temperature, pressure, and mechanical stress, and the addition or subtraction of chemical components. The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks ...

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  • Marble: Metamorphic Rock: Pictures, Definition, Properties

    Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite (CaCO 3) and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite. Under the conditions of metamorphism, the calcite in the limestone ...

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  • Metamorphic Rocks

    Foliated rocks are the result of intense pressure (and sometimes, to a lesser degree, are also the result of heat). Different grades of metamorphism are demonstrated when a shale is subjected to increasingly greater pressure and heat - first it becomes slate, then phyllite, then schist, and finally, gneiss .

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  • 6.3: Metamorphic Textures

     · Each rock name has a specific texture that defines and distinguishes it, with their descriptions listed below. Slate is a fine-grained metamorphic rock that exhibits a foliation called slaty cleavage that is the flat orientation of the small platy crystals of mica and chlorite forming perpendicular to the direction of stress.

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  • Metamorphic Rocks

    4 a metamorphic rock used for tiles and roofs 5 an organic metamorphic rock 8 limestone is the parent rock of this 10 an agent of metamorphism resulting from the weight of rocks above 11 an agent of metamorphism related to temperature 12 a foliated dense rock that has light and dark colored banding 14 metamorphic rocks having a banded or ...

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  • Metamorphic Rocks Lesson #14 | Volcano World | Oregon ...

    Rocks are formed on Earth as igneous, sedimentary, or metamorphic rocks. Igneous rocks form when rocks are heated to the melting point which forms magma. 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.

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  • Metamorphic rocks

    With impure carbonate rocks, the carbon dioxide produced by the breakdown of calcite is removed from the system and calc-silicate rocks are formed. In some cases, the metamorphic fluid contains other volatiles such as boron and fluorine, resulting in the formation of different mineral assemblages.

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  • Basics--Metamorphic Rocks Table

     · Most metamorphic rocks form during regional metamorphism, where whole sectors of the crust are pressurized and heated, forcing large volumes of rock to recrystallize into new minerals that are stable under the new conditions. As a result, rocks are changed into metamorphic rock across a region that may be many miles wide.

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  • Metamorphic rock

    Metamorphic rocks formed from direct magma heating and intrusions are termed as thermal or contact metamorphic rocks. Those formed as a result of widely distributed pressure and temperature changes induced by tectonic movements are known as regional metamorphic rocks. Metamorphic rocks are largely grouped into foliated and non-foliated rocks.

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  • Metamorphic Petrology; Geology 102C

    metasomatism: means a change in rock composition resulting from diffusion or fluid influx. For example, SiO 2 -rich fluids can infiltrate ultramafic rocks, which normally have rather little silica, dramatically changing the bulk composition, and stabilizing a new group of high- SiO 2 minerals.

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  • 7.2 Classification of Metamorphic Rocks – Physical Geology ...

    The resulting rock, which includes both metamorphosed and igneous material, is known as migmatite (Figure 7.2.5). Figure 7.2.5 Migmatite from Prague, Czech Republic. As already noted, the nature of the parent rock controls the types of metamorphic rocks that can form from it under differing metamorphic …

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  • Metamorphic Rock Testing Lab

    Metamorphic rocks can form when igneous, sedimentary or other metamorphic rocks undergo changes in heat and pressure. The word sedimentary comes from a Latin word that means "settling." Sedimentary rocks can form ... on the rock, the result is negative. Write your observations in your Journal. 6. Open the Table and compare your observations ...

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  • Metamorphic Rocks and the Rock Cycle

    igneous and metamorphic rocks (this section will only focus on foliation in metamorphic rocks). Foliation in metamorphic rocks occurs when the minerals in the rock align and recrystallize along planes of parallel orientation as a result of heat and compressional forces. Minerals recrystallize into platy, elongated, or flattened grains,

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  • Metamorphic Rocks & Environments | Asbury Carbons

    The three basic rock types are igneous, metamorphic, and sedimentary. Rocks are considered igneous if they result from solidification of a significant melt, i.e., melting other than "point melting" as the result of localized melting resulting from metamorphic reactions. Igneous rocks …

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  • How Are Metamorphic Rocks Formed?

    Metamorphic rocks result from the forces active during plate tectonic processes. The collision of plates, subduction, and the sliding of plates along transform faults create differential stress, friction, shearing, compressive stress, folding, faulting, and increased heat flow.

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  • Metamorphic Rocks

    Rocks that come in contact with this hydrothermal solution can have their composition altered as a result of this recrystalization. The Classification of Metamorphic Rocks Metamorphic rocks are classified as foliated or nonfoliated. Foliated metamorphic rocks appeared banded or layered. Nonfoliated metamorphic rock usually contains one mineral.

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  • GeoI Metamorphic Rocks

    Pelitic rocks are fine grained mudstones, siltstones and shales that contain a high percentage of clays, with lesser quartz and variable amounts of calcite. Their high Al content leads to a high percentage of micas in the resulting metamorphic rock.

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  • 1.5

    In many cases, the resulting rocks display a preferred orientation of minerals, as new minerals form perpendicular to the maximum pressure exerted on the rock. Some important metamorphic rocks types are gneiss (''nice''), schist (''shist''), and slate. Metamorphic rocks are fairly uncommon at the earth''s surface so they usually do not contribute ...

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  • What Makes Metamorphic Rocks So Unique?

     · The resulting metamorphic rocks from the cores of large mountain chains like the Appalachians. Local metamorphism happens at a much smaller level, usually from nearby igneous intrusions. It is sometimes referred to as contact metamorphism. A gneiss boulder showing characteristic mineral banding.

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  • The three causes of Metamorphism in Rocks ...

    The three causes of Metamorphism in Rocks. Metamorphism in geology is when one type of rock is transformed into another type of rock called a metamorphic rock. The word metamorphic comes from the Greek words meaning "change" and "form.". There are two main factors that can cause the conversion: heat, pressure.

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  • 6 Metamorphic Rocks – An Introduction to Geology

    Mylonites are metamorphic rocks created by dynamic recrystallization through directed shear forces, generally resulting in a reduction of grain size. When larger, stronger crystals (like feldspar, quartz, garnet) embedded in a metamorphic matrix are sheared into an asymmetrical eye-shaped crystal, an augen is formed .

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  • Metamorphic Rocks

     · The resulting metamorphic rock may not have any observable mineral pattern. One texture used to describe non-foliated metamorphic rocks is granoblastic . Rocks that have a granoblastic texture will have relatively large, granular or anhedral crystals that are observable to the naked eye and are usually equal in size.

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  • 8 Metamorphic Minerals and Metamorphic Rocks – Mineralogy

    Depending on its composition, a high-grade metamorphic rock may undergo partial melting, also called anatexis, so both metamorphic and igneous processes contribute to its evolution. When this happens, the rock, strictly speaking, is no longer a metamorphic rock. We call the resulting partially melted rocks migmatites, which means "mixed rocks ...

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  • 7.2 Classification of Metamorphic Rocks – Physical Geology

    If a rock is buried to a great depth and encounters temperatures that are close to its melting point, it will partially melt. The resulting rock, which includes both metamorphosed and igneous material, is known as a migmatite (Figure 7.9). Figure 7.9 Migmatite from Prague, Czech Republic

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  • Metamorphic Rocks | National Geographic Society

     · Metamorphic rock, estimated to be as old as 3.8 billion years, located near Isua at Qorqut Sound, Greenland. rock formed by the cooling of magma or lava. molten rock, or magma, that erupts from volcanoes or fissures in the Earth''s surface. molten, or partially melted, rock …

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  • How Are Metamorphic Rocks Formed?

     · The metamorphic rocks which are produced by this process as known as dynamothermal metamorphic rocks, and are some of the most commonly formed. Classification Of Metamorphic Rocks . While metamorphic rocks can be formed in different ways, the resulting rocks can also be categorized based on the way in which minerals align in the newly formed rock.

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  • What are metamorphic rocks?

    Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot …

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  • Hornfels: Metamorphic Rock

    As a result, hornfels does not have a specific chemical or mineralogical composition. It inherits its composition from the rocks that are metamorphosed plus the fluids involved in the metamorphic process. Interpreting composition, grain size, texture, and geologic history can make hornfels a very difficult rock to identify.

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  • 11.2: Agents of Metamorphism

     · The end result is a rock with a metamorphic pattern called a foliation. Metamorphic foliations are the patterns seen in a rock that has experienced differential pressure; these foliations may be fairly flat or have a wavy appearance possibly due to more than one direction of greatest pressure.

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  • Classification of Metamorphic Rocks: Texture & Parent ...

     · Metamorphic rocks are classified by their protolith, which is the parent rock or the original, unmetamorphosed rock, and by texture. The texture of a metamorphic rock …

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  • Metamorphic Rock Description

    The resulting rocks are no longer metamorphic, they are igneous. 2. Pressure. Exposure to high pressure does not change the kinds of minerals found in a rock. Pressure only reorients the mineral crystals. This reorientation is perpendicular (at right angles) to the direction of pressure. For an analogy, consider a jar full of pennies.

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  • Metamorphic Rocks

    in the solid state, a process we call metamorphism.The result is a new rock type with a distinctive texture and fabric and, in some cases, new mineral compositions. In the photograph above, metamorphic rocks are exposed in the sheer walls of Arizona''s Grand Canyon. Here, near Phantom Ranch, metamorphic rocks dominate the inner gorge

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  • METAMORPHIC ROCKS & PROCESSES

    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.

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