metamorphic rock

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metamorphic rock

[¦med·ə¦mȯr·fik ′räk]
(petrology)
A rock formed from preexisting solid rocks by mineralogical, structural, and chemical changes, in response to extreme changes in temperature, pressure, and shearing stress.

metamorphic rock

Rock which has been altered in appearance, density, and crystalline structure (and in some cases mineral composition) by high temperature and/or high pressure; e.g., slate is a metamorphic rock derived from shale.
References in periodicals archive ?
Michelangelo's unfinished Prisoners, which seem as if they were being metamorphosed into flesh from stone, participate in the deep Ovidian tradition to which he was heir.
Bedrock in the Inaja Greenstone Belt consists of Late-Archean age metamorphosed volcanic and sedimentary rocks which are intruded by igneous bodies of granitic to gabbroic composition.
After five years of experimenting to create the perfect amorous atmosphere for their blue poison arrow frogs, scientists at the National Aquarium in Baltimore have something to celebrate: six newly metamorphosed blue frogs, the first bred in the United States.
Sediments in the project area range from 20 to 80 metres in thickness and overly metamorphosed igneous and sedimentary rocks of the Fraser Range metamorphic complex.
are bent and welded together, metamorphosed into the contours of striding flank and swelling belly.
The procedure will follow a flowchart that has proven effective in recovering diamonds from the metamorphosed host rocks of the Festival property.
The mineralization is hosted in Proterzoic aged metamorphosed sediments of the Brasiliano orogeny.
The geology of northeast China is dominated by basement-cored uplifts of variably metamorphosed Archean to Middle Proterozoic rocks, which are surrounded by deformed, yet largely unmetamorphosed, basinal sedimentary rocks of the Late Proterozoic, and Permian to Cretaceous ages.
Regionally, the prospective stratigraphy consists of metasedimentary rocks including quartzo-feldspathic gneiss, amphibolite gneiss, calc-silicate gneiss and marble, metamorphosed to upper amphibolite facies, associated with pegmatities" (Walton, 1996).
63% within contact metamorphosed sedimentary rocks.
The 1500 mile-km-long region is characterized by east-trending blocks of metamorphosed Archan and Proterozoic strata that were episodically uplifted during Variscan, Indosinian and Yanshanian deformation and magnetic events.