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According to Grubenmann's classification of metamorphic rocks (1904), the
lowermost depth zone of metamorphism, which is characterized by high
temperatures (500 to 700 degrees C), mostly strong hydrostatic pressure,
and low or no shearing stress. It produces rocks such as high-grade
schists and gneisses, granulites, eclogites, and amphibolites. The concept
includes effects of high-temperature contact metamorphism and
metasomatism. Modern usage stresses temperature-pressure conditions
(highest metamorphic grade) rather than the likely depth of zone. Also
spelled catazone. CF: mesozone; epizone. See also: katamorphism AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
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