Contact Metamorphism


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contact metamorphism

[′kän‚takt ‚med·ə′mȯr·fiz·əm]
(petrology)
Metamorphism that is genetically related to the intrusion or extrusion of magmas and takes place in rocks at or near their contact.

Contact Metamorphism

 

the alteration of rock under the influence of intrusive magmatic bodies. Alteration occurs most intensively close to the intrusive body and diminishes with distance from it. Both sedimentary and magmatic rock may undergo contact metamorphism, in the course of which their original mineralogical content and structure change. As a result of contact metamorphism various hornfels and other rocks with corneous facies are formed.

References in periodicals archive ?
1996b, Prograde and retrograde fluid flow during contact metamorphism of siliceous carbonate rocks from the Ballachulish aureole, Scotland: Contribution to Mineralogy and Petrology, v.
The model predictions for maximum and minimum temperatures reached in the country rock were used to evaluate microstructures that indicate contact metamorphism overprinting regional metamorphism.
Although it is possible to observe local silicification in the outcrops near the contact, the regional metamorphic foliation is still present in rocks from the contact aureole and the overprinting contact metamorphism is mainly evident in thin section.
4]years after the intrusion; this is the thermal metamorphic peak of the contact metamorphism.
1996) noted that contact metamorphism of folded strata of the Stirling belt by the Chisholm Brook suite implies that folding of the Stirling belt can be bracketed between ca.
The other missing sample (12) cannot be plotted on these diagrams because it is at amphibolite facies as a result of contact metamorphism by a Devonian intrusion, as discussed below.
However, locally where regional or contact metamorphism is at higher grades, the matrix contains abundant coarse muscovite and biotite, and individual sandsized grains exhibit granoblastic textures.
The clastic lithologies are typically spotted with biotite and cordierite as a result of contact metamorphism by the Wedgeport Pluton (MacLean et al.