Contact metamorphism occurs locally, at and near the contacts between intrusions and the surrounding country or host rock. The heat introduced by the intrusion controls the metamorphism. The effects of increased temperature are most pronounced where intrusions occur at shallow levels.
geology.csupomona.edu/alert/metamorphic/contact.htm geology.csupomona.edu/alert/metamorphic/contact.htm
As discussed previously, contact metamorphism occurs as a result of a high geothermal gradient produced locally around intruding magma. ... The facies of contact metamorphism progress in temperature at relatively low pressure from the Albite-Epidote Hornfels Facies to the Hornblende Hornfels Facies, to the Pyroxene...
www.tulane.edu/~sanelson/eens212/contactmeta.htm www.tulane.edu/~sanelson/eens212/contactmeta.htm
Metamorphism - Wikipedia, the free encyclopedia
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Metamorphism is the solid-state recrystallization of pre-existing rocks due to changes in physical and chemical conditions, primarily heat, pressure, and the introduction of chemically active fluids....
en.wikipedia.org/wiki/Metamorphism
Rocks that are in contact with hot magma or lava often become metamorphosed. This is called contact metamorphism. ... Contact metamorphism can either happen deep underground or at the Earth's surface. Underground, hot magma, fills areas within the crust; large areas are called batholiths. The hot magma alters the...
www.windows.ucar.edu/tour/link=/earth/geology/meta_cont... www.windows.ucar.edu/tour/link=/earth/geology/meta_contact.html
Deep underground, zones of metamorphism form around the hot magma of batholiths. Click on image for full size (18K GIF ); L.Gardiner/Windows Original ... Heat changes rocks that come in contact with hot magma or lava. This is called contact metamorphism.
www.windows.ucar.edu/tour/link=/earth/geology/meta_cont... www.windows.ucar.edu/tour/link=/earth/geology/meta_contact.html&edu=high
Contact metamorphism occurs when local rocks are metamorphosed by the heat from an igneous intrusion, such as limestone turning to marble along the contact zone. Some of the changes that occur in the older rock are due simply to the heat radiated from the igneous mass and to the pressures it creates.
www.answers.com/topic/metamorphism www.answers.com/topic/metamorphism
Contact metamorphism where a lava flow baked a shale. ... The lava flow exposed in this roadcut near Alturas, California, has baked the mud beneath it into brick-red shale, a case of contact metamorphism. This form of metamorphism is caused by the heat of magma and is restricted to a narrow zone, unlike regional metamorphism.
geology.about.com/library/bl/images/blcontactmet.htm geology.about.com/library/bl/images/blcontactmet.htm
Because rock is such a good insulator, often this contact metamorphism extends no more than a few meters or tens of meters away from the magma body. Sometimes the contact zone is measured in centimeters or millimeters!
www.pitt.edu/AFShome/c/e/cejones/public/html/GeoImages/... www.pitt.edu/AFShome/c/e/cejones/public/html/GeoImages/6MetamorphicRocks/ContactMM.html
Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make ... ROBERT HALL 1...
www.sciencemag.org/cgi/content/abstract/208/4449/1259
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