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Topic: Metamorphic rock

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  Metamorphic Rock - MSN Encarta
Metamorphic Rock, type of rock formed when rocky material experiences intense heat and pressure in the crust of the earth.
Metamorphic rocks are one of the three main groups of rocks.
The other two groups are igneous rocks, which form when magma or molten lava solidifies, and sedimentary rocks, which form when wind or water deposit sediments and the sediments become compacted.
encarta.msn.com /encyclopedia_761578403/Metamorphic_Rock.html   (910 words)

 Metamorphic Rock - Search View - MSN Encarta
The mineral structure of metamorphic rocks depends both on the type of parent rock and on the amount of heat and pressure present when the rocks formed.
Low-grade metamorphism of ultramafic igneous rocks (dark igneous rocks composed mostly of magnesium and iron) produces serpentine, a group of sheet-silicate minerals (crysotile, lizardite, antigorite) that are the principal sources of asbestos.
Metamorphism of impure limestones produces talc, a very soft silicate mineral that is an important mineral filler in paints, rubber, paper, asphalt, and cosmetics.
encarta.msn.com /text_761578403__1/Metamorphic_Rock.html   (2307 words)

 Metamorphic rock - Wikipedia, the free encyclopedia
Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form".
Metamorphic rocks make up a large part of the Earth's crust and are classified by texture and by chemical and mineral assemblage (metamorphic facies).
For instance, the small calcite crystals in the sedimentary rock limestone change into larger crystals in the metamorphic rock marble, or in metamorphosed sandstone, recrystallisation of the original quartz sand grains results in very compact quartzite, in which the often larger quartz crystals are interlocked.
en.wikipedia.org /wiki/Metamorphic_rock   (1001 words)

 Metamorphic Rock: Face of the Earth   (Site not responding. Last check: 2007-11-02)
These rocks formed from other rocks by essentially solid state changes in mineralogy and textures resulting from chemical or physical changes that occur in solid rock buried in the earth's crust are called metamorphic rocks.
Metamorphic rocks are sedimentary or igneous rocks that have been modified or changed in form, that is, the size, shape and arrangement of the minerals in rocks, by heat or pressure.
Metamorphic rocks are identified by the types of minerals they contain and their texture.
www.edu.pe.ca /southernkings/metamorphichb.htm   (304 words)

 10(g) Characteristics of Metamorphic Rocks
Metamorphic rocks also are the rock type found at the core of the world's various mountain ranges.
This rock is characterized by the foliation (Figure 10g-6) of its mineral grains which causes it to have cleavage that is parallel.
Marble is a nonfoliated metamorphized limestone or dolomite).
www.physicalgeography.net /fundamentals/10g.html   (875 words)

 Amateur Geologist Structured Geological Glossary: Metamorphic Rocks   (Site not responding. Last check: 2007-11-02)
Metamorphic rocks that resemble breccia or poorly sorted sandstone and that form by dynamic metamorphism, which breaks and reorients grain.
In a metamorphic rock, the parallel arrangement of all planar or linear crystal as a result of rock flowage during metamorphism.
Any deviation from random-hess in the distribution of the crystallographic or grain shape axes of mineral of a rock (including flow cleavage and foliation), produced by deformation and nonuniform stress during crystallization in metamorphic rocks or by depositional currents in sediment.
www.amateurgeologist.com /content/glossary/rock/metamorphic.html   (1061 words)

 Rockdoctors Guide To Metamorphic Rocks
Because of the high heat, the rock surrounding the intrusion (known as country rock) is often altered.
The second type of metamorphic rock is usually the result of extreme pressure rather than that of temperature.
This is simply a description of the overall intensity of metamorphism the rock was subjected to.
www.cobweb.net /~bug2/rock5.htm   (496 words)

 A Very Simple Metamorphic Classification
etamorphism is the alteration of a preexisting rock (the parent rock) due to heat and pressure caused by burial in the earth.
Metamorphism is the alteration of a parent rock into a metamorphic rock.
The rocks become foliated, that is the texture sequence of slaty cleavage to schsitosity, to banded, or the rock sequence slate to phyllite to schist to gneiss.
csmres.jmu.edu /geollab/Fichter/MetaRx/metasimple.html   (1329 words)

 Metamorphic Rocks
As shale is subjected to increasing grade of metamorphism (increasing temperatures and pressures), it undergoes successive changes in texture associated with an increase in the size of the mica grains.
It is intermediate between the metamorphic and the igneous rocks.
In regional metamorphic terranes, the temperature and pressure regime is indicated by the distribution of metamorphic minerals across a large area.
www.gpc.edu /~pgore/geology/geo101/meta.htm   (1243 words)

 Metamorphic Rock Textures
The mineral constituents of foliated metamorphic rocks are oriented in a parallel or suhparallel arrangement.
Foliated metamorphic rocks are generally associated with regional metamorphism.
The name for the rock with this texture is slate, and the rock is characterized by a tendency to separate along parallel planes.
geology.csupomona.edu /alert/metamorphic/mtexture.htm   (529 words)

 1.8 metamorphic rocks
Metamorphism- the solid state transformation of preexisting rock into texturally or mineralogically distinct new rock as a result of high temperature, high pressure, or both.
(3) Metamorphic rocks are qualitatively divided in Low-grade metamorphic and high-grade metamorphic rocks.
Metamorphic process where the country rock is baked by an intrusion of molten magma.
www.geology.ufl.edu /Class_Notes/gly2010/metamorphic_rocks.html   (1173 words)

 Metamorphic Rocks
Metamorphic rocks have been changed, usually by heat and pressure, from their original condition into rock with new minerals and/or structures.
Metamorphic rock is notoriously difficult to date, partly because the process of metamorphism "resets the clock" of many chemical reactions and nuclear decay sequences.
Georgia's metamorphic rock incorporates remains of marine sediments, volcanics, and crust from the Iapetus Ocean (ancestor of the Atlantic Ocean).
home.att.net /~cochrans/metrok01.htm   (411 words)

 How Rocks Are Formed
Metamorphic rocks were originally igneous or sedimentary, but due to movement of the earth's crust, were changed.
Metamorphic rocks are the least common of the 3 kinds of rocks.
Metamorphic rocks are igneous or sedimentary rocks that have been transformed by great heat or pressure.
www.rocksforkids.com /RFK/howrocks.html   (2284 words)

 Outdoor Recreation: Rock Hounding
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, mineral-rich fluids or, more commonly, some combination of these factors.
In metamorphic rocks some or all of the minerals in the original rock are replaced, atom by atom, to form new minerals.
www.desertusa.com /geofacts/rock_met.html   (344 words)

 Petrology - Metamorphic Rock
Metamorphism is the process by which preexisting rocks are transformed or altered in a solid state under relatively high pressure, temperature, and/or hot circulating fluids.
The effects of metamorphism are the formation of new minerals, changes in shape and size of mineral grains, and the development of new structures in the rock.
These effects are dependent on the properties of the parent rock, type of metamorphic environment present, and the duration of the process until the "new" rock is finally exposed at the earth's surface.
www.emporia.edu /earthsci/amber/go240/metamor.htm   (729 words)

 Metamorphic Rocks
Metamorphic rocks are rocks that have changed from one form to another.
These rocks form deep in the earth where the it is very hot and there is a lot of pressure.
Metamorphic rocks begin to form at 12-16 kilometers (7.5 - 10 miles) beneath the surface of the earth.
www.mcsdk12.org /curr/WebQuests/Rocks/metamorphic_rocks.htm   (211 words)

 Rock (geology) - Wikipedia, the free encyclopedia
Rocks are classified by mineral and chemical composition, by the texture of the constituent particles and by the processes that formed them.
Plutonic or intrusive rocks result when magma cools and crystallises slowly within the Earth's crust, while volcanic or extrusive rocks result from magma reaching the surface either as lava (when the molten rock is in the mantle, it is called magma, when it is above the crust, it is called lava) or fragmental ejecta.
Metamorphic rocks are formed by subjecting any rock type (including previously-formed metamorphic rock) to different temperature and pressure conditions than those in which the original rock was formed.
en.wikipedia.org /wiki/Rock_(geology)   (345 words)

 Metamorphic Rock Identification Exercise
Metamorphic rocks result from mineralogical and structural adjustments of solid rocks to physical and chemical conditions differing from those under which the rocks originally formed.
A common phenomenon is the effect produced adjacent to igneous intrusions where several metamorphic zones represented by changing mineral assemblages reflect the temperature gradient from the high-temperature intrusion to the low-temperature host rocks; these zones are concentric to the intrusion.
Resulting rocks have equidimensional grains because of a lack of stress and are usually fine-grained due to the short duration of metamorphism.
geology.csupomona.edu /alert/metamorphic/metarxs.htm   (783 words)

 Metamorphic rock nomenclature and description
A medium-grained rock which is fissile (possesses a schistosity) due to the parallel alignment of minerals (generally sheet silicates).
A medium- to coarse-grained rock with a compositional layering and/or a preferred orientation of minerals (or mineral aggregates).
For example, the same rock might be named a hornblende schist (textural aspect and dominant mineral), an amphibolite (metamorphic grade and mineral assemblage), or a metabasalt (original rock type), according to which features we wanted to stress or to contrast with other rocks.
teachserv.earth.ox.ac.uk /courses/es2-metrock/1names.html   (687 words)

 Reno Gem and Mineral Society rock club rock identity key
It is usually gray in igneous rocks; gray, white, yellow, or red in sedimentary rocks; and gray or white in metamorphic rocks.
Pieces of rock that have been buried in the soil, or rolled in a stream or river are not good to collect.
A rock, called peridotite, at the bottom of the oceanic plate is changed to serpentinite because there is less weight on it, the temperature is lower, and water circulates through it.
www.renorockclub.com /allaboutrocks.html   (5753 words)

 Metamorphic Rocks   (Site not responding. Last check: 2007-11-02)
As with igneous and sedimentary rocks, metamorphic rocks are classified according to their texture and mineral composition, with texture being the predominant characteristic.
The changes that occur to metamorphic rocks can be related to the degree or grade of metamorphism that they experienced, that is from low-grade, to medium-grade, and eventually to high grade metamorphism given the right conditions and enough time.
As opposed to the foliated metamorphic rocks, the nonfoliated rocks are not distinctly layered.
seis.natsci.csulb.edu /bperry/ROCKS.htm   (2138 words)

 Metamorphic Rocks
Metamorphism usually happens where plates are coming together; rocks are heated and are under high pressure.
Rocks metamorphose when they are in a place that is very hot and pressure is high.
The rocks are changed either in small areas of contact metamorphism or large areas of regional metamorphism.
www.windows.ucar.edu /tour/link=/earth/geology/meta_intro.html   (336 words)

 [No title]   (Site not responding. Last check: 2007-11-02)
Rocks are formed on Earth as igneous, sedimentary, or metamorphic rocks.
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.
Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock.
volcano.und.nodak.edu /vwdocs/vwlessons/lessons/Metrocks/Metrocks2.html   (145 words)

 How Metamorphic Rocks Are Formed   (Site not responding. Last check: 2007-11-02)
Metamorphic rocks are rocks that have "morphed" into another kind of rock.
The rocks are under tons and tons of pressure, which fosters heat build up, and this causes them to change.
If you exam metamorphic rock samples closely, you'll discover how flattened some of the grains in the rock are.
sln.fi.edu /fellows/payton/rocks/create/metamorph.htm   (69 words)

 Oilfield Glossary: Term 'metamorphic'   (Site not responding. Last check: 2007-11-02)
Metamorphic rocks form from the alteration of preexisting rocks by changes in ambient temperature, pressure, volatile content, or all of these.
The texture of metamorphic rocks can vary from almost homogeneous, or nonfoliated, to foliated rocks with a strong planar fabric or foliation produced by alignment of minerals during recrystallization or by reorientation.
Graphite, chlorite, talc, mica, garnet and staurolite are distinctive metamorphic minerals.
www.glossary.oilfield.slb.com /Display.cfm?Term=metamorphic   (146 words)

 Metamorphic Rocks
The Acasta gneiss, a metamorphic rock, is 3.96 billion years old.
Metamorphic rocks begin to form at 12-16 kilometers beneath the earth's surface.
Below is a summary of the major characteristics of metamorphic rocks.
library.thinkquest.org /J002289/meta.html   (211 words)

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