25-3. Metamorphic Fabrics. The granulite facies consists of very high grade metamorphic rocks like gneiss. Temperaturepressure diagram showing the three major types of metamorphic facies series proposed by Miyashiro (1973, 1994). The fabric of a metamorphic rock also tells of its history. Thermodynamics and Gibbs free energy ⢠Reactions take place in a direction that lowers Gibbs free energy ⢠Equilibrium is achieved only when Gibbs ... PowerPoint Presentation Author: Wikipedia has a good list of the minerals possible in each facies. Winter (2001) An Introduction to Igneous and Metamorphic Petrology. A Barrovian metamorphic sequences. Metamorphic Facies Best, Chapter 10 Metamorphic Grade Controlled by the temperature of metamorphism Low-grade rocks contain hydrated and carbonated phases High-grade rocks are dehydrated and decarbonized Metamorphic Zones Mappable metamorphic units of similar grade in a rock of distinct composition Isograds are lines marking the first appearance of key minerals Zones of ⦠This type of metamorphic rock is the name of highest-grade metamorphic facies. Metamorphic rocks form by the alteration of pre-existing rocks in the solid state by heat, pressure, and chemically active fluids. Metamorphic Facies. Metamorphic Facies. Fig. After Turner (1981). They are said to belong to the same metamorphic facies. Metamorphic Petrology: Mineralogical, Field, and Tectonic Aspects. METAMORPHIC FACIES: Metamorphic rocks are often classified on the basis of metamorphic facies. The mineralogy of the a metamorphic rock is not the only line of evidence to determine its history. Prentice Hall. Chart of metamorphic facies showing mineral reactions and indicators for impure limestone, pelitic and mafic igneous protoliths (modified from Brownlow, 1979). Each facies has several mineral assemblages unique to that facies; the assemblage depends on the parent rock (shale vs. basalt). Fig. Metamorphic grade is a general term for describing the relative temperature and pressure conditions under which metamorphic rocks form. Metamorphic facies ⢠We know that the chemical composition of metamorphosed rocks does not change ⢠Metamorphism is isochemical ⢠Elements are redistributed but not lost ⢠Consequently any changes are the result of temperature and pressure ⢠This has led to the concept of metamorphic facies Metamorphic facies represent specific pressure and temperature conditions. Parent rocks of different compositions, if metamorphosed under the same pressure-temperature conditions, will characteristically contain the same set of definite minerals. The eclogite facies is an extremely high grade region of the plot and comprises metamorphic rocks that are a bit beyond our level in GY 111. This eclogite specimen from Jenner, California, consists of high-magnesium pyrope garnet , green omphacite (a high-sodium/aluminum pyroxene) and deep-blue glaucophane (a sodium-rich amphibole). There is, however, a sample of eclogite in your GY 111L metamorphic rock tray just to keep you on your toes. McGrawHill. ⢠A metamorphic facies is a set of associated metamorphic rocks that formed under the same conditions. Metamorphic Zones and Facies. Granulite facies (Fig.1) was introduced by Eskola (1939) to define the highest grade of regional metamorphic rocks that contain pyroxene in place of normal hydrous ferromagnesian minerals. Plotting metamorphic mineral diagrams. ... PowerPoint Presentation Author: Owner Created Date: 7.25 ⢠Metamorphism can occur at divergent and convergent boundaries. 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