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2nd Year Notes 2017 :

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Ashutosh Singh
University of Delhi (DU), New Delhi

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THE CONCEPT OF metamorphic FACIES THE CONCEPT OF FACIES Eskola (1915) defined a metamorphic facies as: A metamorphic facies includes rocks which .may be supposed to have been metamorphosed under identical conditions. As belongings to a certain facies we regard rocks which if having an identical chemical composition, are composed of the same minerals. limestone Basalt Sandstone Same broad metamorphic conditions Marble Amphibolite Quartzite A metamorphic facies includes mineral assemblage of a set of associated rocks PROBLEMS WITH THE FACIES CLASSIFICATION A diagnostic mineral assemblage is required! Scheme based on P-T only, composition of fluids not considered Impracticability of Facies Classification Table 25-1. Definitive Mineral Assemblages of Metamorphic Facies Facies Definitive Mineral Assemblage in Mafic Rocks Zeolite zeolites: especially laumontite, wairakite, analcime Prehnite-Pumpellyite prehnite + pumpellyite (+ chlorite + albite) Greenschist chlorite + albite + epidote (or zoisite) + quartz actinolite Amphibolite hornblende + plagioclase (oligoclase-andesine) garnet Granulite orthopyroxene (+ clinopyrixene + plagioclase garnet hornblende) Blueschist glaucophane + lawsonite or epidote (+albite chlorite) Eclogite pyrope garnet + omphacitic pyroxene ( kyanite) Contact Facies After Spear (1993) Mineral assemblages in mafic rocks of the facies of contact metamorphism do not differ substantially from that of the corresponding regional facies at higher pressure. Winters chapter

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