Metamorphisme de contact pdf

Aug 01, 2012 issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Contact metamorphism is a type of metamorphism where rock minerals and texture are changed, mainly by heat, due to contact with magma. An aureole is the zone surrounding an intrusion, which is a mass of igneous rock that solidified between other rocks located within the earth. Contact metamorphism is usually restricted to relatively shallow depths low pressure in the earth because it is only at shallow depths where there will be a large contrast in temperature between the intruding magma and the surrounding country rock. The chemical components and crystal structures of the minerals making up the rock may change even. All structured data from the file and property namespaces is available under the creative commons cc0 license. Relations entre tectonique, metamorphisme et mise en place. Il y a presence dun dome thermique qui fait remonter lesisothermes. Les gradients ne doivent pas etre confondus avec des geothermes ou des paleogeothermes. Contact metamorphic rocks recommendations by the iugs subcommission on the systematics of metamorphic rocks.

This is an easy name to recall if you remember that these. Illite crystallinity is a technique used to classify lowgrade metamorphic activity in pelitic rocks. Lassistance scolaire personnalisee utilise des cookies pour vous offrir le meilleur service en savoir plus. Resume le massif granitique hercynien du ment, est situe dans le maroc central septentrional. As discussed previously, contact metamorphism occurs as a result of a high geothermal gradient produced locally around intruding magma. Svt terminale s assistance scolaire personnalisee et. Metamorphism is the change of minerals or geologic texture distinct arrangement of minerals in preexisting rocks protoliths, without the protolith melting into liquid magma a solidstate change. The contact aureoles produced in siliceous limestones and dolomites. Dans les dorsales, les solides anhydres peuvent fondre. Callegari, department of science, mineralogy and petrology, university of torino, italy 2. Chapiter 1 metamorphisme et roches metamorphiques 2. Determining the illite crystallinity index allows geologists to designate what metamorphic facies and metamorphic zone the rock was formed in and to infer what temperature the rock was formed. Files are available under licenses specified on their description page.

Easily share your publications and get them in front of issuus. Amphiboles occur in contact metamorphic aureoles around igneous intrusions. Metamorphism is the change of minerals or geologic texture distinct arrangement of minerals in preexisting rocks, without the protolith melting into liquid magma a solidstate change. Les temperatures seront plus elevees dans les roches immediatement au contact et en diminuant progressivement vers les zones distales. Other articles where contact metamorphism is discussed. Quelques remarques sur le metamorphisme et les roches sy. Oct 06, 2015 this feature is not available right now. On observe souvent une zone qui entoure lintrusion appelee aureole. Metamorphisme et roches metamorphiques by ben chir issuu. Le metamorphisme est une transformation sans fusion. Petrologie metamorphique stu3 cours td et exercices.

Ces changements resultent des conditions physiques etou chimiques qui di. Livre metamorphisme et geodynamique cours et exercices. Callegari, department of science, mineralogy and petrology, university of torino, italy. The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. Le metamorphisme roches, pression et temperature 11.